Backup method and system for thermal management of a hydrotherapy system

Abstract

Spa systems can be used year-round and in cold weather, providing a pleasurable experience for the user through cold ambient outdoor temperatures and the hot water of the spa. However, a malfunction of the water circulation pump and / or heater of the spa system, whether mechanical, electrical, or caused by a total power outage, means that if the ambient conditions are cold enough, the water in the spa system or its pipes can easily freeze, causing cracks in the spa system or pipes, and thus leaks when the water thaws, requiring costly repairs or replacement of parts or the entire system. Accordingly, a freeze protection system is provided that uses a backup thermal management system, either discretely or in combination with other backup systems. These freeze protection systems provide a backup by providing a thermal input to the spa system through an alternate thermal path and providing an alert when a mechanical failure, electrical failure, or the like occurs.

Description

[0001] This case is a divisional application based on the invention patent with application date of 2018-08-16, application number 201880063393.7, and name “Backup method and system for thermal management of spa system” as the parent case. Technical Field

[0002] This patent application relates to hydrotherapy (spa) systems, and more particularly to backup methods and systems for spa systems in potentially freezing environments. Background Art

[0003] Since the introduction of the first hot tub built for the home, spa systems (also known as hot tubs or Jacuzzis (the manufacturer's name is synonymous with this type of product, regardless of the manufacturer)) have become increasingly popular over the past 50 years and have become an increasingly common feature of home backyards for the past 25 years. During this time, developments have been made in the materials used, the addition of spa jets, and more recently, the introduction of so-called swim spas. While spa systems typically provide their users with a steady temperature water bath of approximately 100°F to 104°F (approximately 38°C to 40°C), swim spas offer a second mode of operation that combines a spa system with a rotating pool of hot water and a net flow from side to side at a lower temperature (typically around 80°F (approximately 27°C)) to provide resistance, allowing the user to "swim" in the spa system.

[0004] Spa systems can be used year-round and, during cooler weather seasons, offer a pleasant user experience by contrasting the cold ambient outdoor temperature with the spa's heated water. However, a significant portion of spa systems are installed in locations where temperatures reach freezing or below. If a spa system is located in a summer cottage or similar location, then similar to a residential swimming pool, the spa system will drain at the end of the season when the cottage is not in use or is used infrequently, and refill at the beginning of the season. However, if the spa system is located in a residential setting or will be used sporadically, periodically, or frequently during cooler weather seasons, it may remain filled and in a "sleep" mode (where the water is heated only during the filtration cycle). Some spa systems may provide limited low-temperature protection and operate the pump at a low speed for a limited time to circulate water through the system based on the expected hot water in the tub, thereby drawing water through the water system.

[0005] However, a known problem with spa systems in outdoor environments, and occasionally in indoor environments, is that if power is cut off to the spa system's water circulation pumps and heaters, the water in the spa system and in the pipes connected thereto can easily freeze if ambient conditions are cold enough. The expansion of the water as it freezes can cause cracks to form in the spa system or the pipes, which can lead to leaks when the water thaws and can require costly or time-consuming repair or replacement of parts or the entire system.

[0006] However, even without power being cut, failure of the water circulation pump and / or heater similarly will not prevent the water from cooling and freezing if ambient conditions are cold enough. Therefore, methods and systems are desired to provide freeze protection for a spa system using a backup thermal management system and / or backup system.

[0007] Other aspects and features of the present invention will become apparent to those skilled in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying drawings. Summary of the Invention

[0008] It is an object of the present invention to alleviate the limitations of the prior art associated with spa systems and, more particularly, to provide a backup method and system for spa systems in environments where freezing is a possibility.

[0009] According to an embodiment of the present invention, a system for freezing protection of a spa system is provided, wherein the spa system has a spa bathtub and a housing supporting the spa bathtub. The system comprises:

[0010] Mains power interface;

[0011] a forced air heater coupled to the mains power connection and configured to allow heated air to be blown into the cavity between the housing of the spa system and the bottom of the spa tub; and

[0012] A temperature control is configured to turn on the forced air heater when a thermostat determines that a temperature of at least one of air in a cavity between the housing of the spa system and the bottom of the spa tub and water within the spa system has dropped below a predetermined threshold.

[0013] According to an embodiment of the present invention, there is provided an apparatus comprising:

[0014] a housing for mounting the device to a housing of a spa system, the spa system including the housing and a spa tub supported by the housing;

[0015] a first mains power interface for coupling to a first mains power source to provide power to a forced air heater coupled to a cavity disposed between the housing and the spa;

[0016] a second mains power interface for coupling to a second mains power source to provide power to the spa pack of the spa system to provide normal operation of the spa system; and

[0017] At least one of the following:

[0018] visual indication means for displaying to a user at least one of a status of the second mains power interface and a status of the forced air heater; and

[0019] An interface supports communications to a communications network for sending a message to a remote user on an electronic device also connected to the communications network regarding at least one of a status of the second mains power interface and a status of the forced air heater.

[0020] According to an embodiment of the present invention, a method is provided, comprising:

[0021] providing means for heating a cavity disposed between a spa tub of a spa system and a housing of the spa system supporting the spa tub; and

[0022] Means are provided for powering the means for heating when a monitored temperature of at least one of air in a cavity between the housing of the spa system and the bottom of the spa tub and water within the spa system has dropped below a predetermined threshold temperature.

[0023] According to an embodiment of the present invention, a system for freezing protection of a spa system is provided, wherein the spa system has a spa bathtub and a housing supporting the spa bathtub. The system comprises:

[0024] Mains power interface;

[0025] a heater coupled to the mains power connection and configured to heat at least one of a predetermined portion of the spa tub and a tube forming part of a circulation loop of the spa system, the circulation loop allowing water to flow into and out of the spa tub; and

[0026] A thermostat is configured to turn on the heater when the thermostat determines that a temperature of at least one of the circulation loop and water within the pipe forming part of the circulation loop has fallen below a predetermined threshold.

[0027] According to an embodiment of the present invention, a system for freezing protection of a spa system is provided, wherein the spa system has a spa bathtub and a housing supporting the spa bathtub. The system comprises:

[0028] A mains power interface connected to the controller;

[0029] a heater coupled to the mains power interface and the controller and configured to heat a predetermined portion of the hydrotherapy system independently of a normal hydrotherapy fluid circuit;

[0030] a temperature sensor disposed at a predetermined position within the hydrotherapy system;

[0031] a drain forming part of said hydrotherapy system; wherein

[0032] The controller activates the heater independent of the state of the normal hydrotherapy fluid circuit when the temperature monitored by the temperature sensor is below a first predetermined threshold.

[0033] According to an embodiment of the present invention, a system for freezing protection of a spa system is provided, wherein the spa system has a spa bathtub and a housing supporting the spa bathtub. The system comprises:

[0034] A mains power interface connected to the controller;

[0035] a heater coupled to the mains power interface and the controller and configured to heat a predetermined portion of the hydrotherapy system independently of a normal hydrotherapy fluid circuit;

[0036] a temperature sensor disposed at a predetermined position within the hydrotherapy system;

[0037] The controller enables the heater and disables the normal hydrotherapy fluid circuit when the temperature monitored by the temperature sensor is below a first predetermined threshold.

[0038] Other aspects and features of the present invention will become apparent to those skilled in the art from a review of the following description of specific embodiments of the invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0040] Figure 1 Typical home spa systems sold commercially by retailers and original equipment manufacturers (OEMs) today;

[0041] Figure 2 The physical structure of a typical home spa system sold commercially by retailers and OEMs today;

[0042] FIG3 schematically depicts the power and control configuration for a typical home spa system according to the prior art;

[0043] FIG4 schematically depicts a backup pump configuration for a typical home spa system according to the prior art by Miller (U.S. Pat. No. 8,621,678);

[0044] Figure 5 A backup system for a typical home spa system according to an embodiment of the present invention;

[0045] Figure 6 A backup system for a typical home spa system according to an embodiment of the present invention;

[0046] Figure 7 A power interface for a hydrotherapy system according to an embodiment of the present invention;

[0047] Figure 8 A power interface for a hydrotherapy system according to an embodiment of the present invention;

[0048] Figure 9 A power interface for a hydrotherapy system according to an embodiment of the present invention;

[0049] Figure 10A and Figure 10B A power interface for a hydrotherapy system according to an embodiment of the present invention;

[0050] Figure 11 is an exemplary flow chart of a control system for managing power failures within a spa system according to an embodiment of the present invention; and

[0051] Figure 12 FIG. 4 is an exemplary analog control configuration for a hydrotherapy system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The present invention relates to spa systems and, more particularly, to backup methods and systems for spa systems in environments where freezing is a possibility.

[0053] The subsequent description provides only (multiple) representative embodiments and is not intended to limit the scope, applicability or configuration of the present invention. More precisely, the subsequent description of (multiple) embodiments will provide an enabling description for implementing one or more embodiments of the present invention to those skilled in the art. It will be understood that various changes may be made to the function and arrangement of elements without departing from the spirit and scope set forth in the appended claims. Therefore, the embodiments are examples or implementations of the present invention, rather than the only implementations. The various appearances of "embodiment", "one embodiment" or "some embodiments" do not necessarily refer to the same embodiment. Although the various features of the present invention can be described in the context of a single embodiment, these features may also be provided individually or in any suitable combination. On the contrary, although the present invention may be described in the context of a separate embodiment herein for clarity, the present invention may also be implemented in a single embodiment or any combination of embodiments.

[0054] References in the specification to "one embodiment," "an embodiment," "some embodiments," or "other embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one, but not necessarily all, embodiments of the invention. The phraseology and terminology employed herein are not to be construed as limiting and are for descriptive purposes only. It will be understood that where a claim or specification refers to "a" or "an" element, such reference is not to be construed as meaning that only one of that element is present. It will be understood that where the specification states that a feature, structure, or characteristic "may," "might," "could," or "would" be included, the specific feature, structure, or characteristic need not be included.

[0055] References to terms such as "left," "right," "top," "bottom," "front," and "back" are intended to be used with respect to the orientation of a particular feature, structure, or element in the drawings depicting embodiments of the present invention. Obviously, such directional terms have no specific meaning with respect to actual use of the device, as the device can be used in a variety of orientations by one or more users.

[0056] Reference to the terms "comprises," "comprising," "consisting of," and grammatical variations thereof do not preclude the addition of one or more components, features, steps, integers, or groups thereof, and the terms are not to be construed as specifying components, features, steps, or integers. Similarly, when used herein, the phrase "consisting essentially of" and grammatical variations thereof are not to be construed as excluding additional components, steps, features, integers, or groups thereof, provided that the additional features, integers, steps, components, or groups thereof do not materially alter the basic and novel characteristics of the claimed composition, apparatus, or method. If the specification or claims refer to "additional" elements, this does not preclude the presence of more than one of the additional elements.

[0057] As used herein and throughout this disclosure, "mains" refers to "mains electricity," the universal alternating current (AC) power delivered to homes and businesses. The two main characteristics of mains electricity—voltage and frequency—vary between regions. Europe, much of Africa, much of Asia, much of South America, and Australia use a nominal voltage of 230V and a frequency of 50Hz. In North America, the most common combination is 120V and a frequency of 60Hz. Other voltages exist; some countries may have, for example, 230V but 60Hz. Mains electricity is distributed via cables, typically terminating in outlets mounted on the walls or other solid parts of buildings, to which electrical devices connect via plugs and cables. Some devices (such as cookers, freezers, refrigerators, washing machines, and tumble dryers) are permanently connected to the mains electricity via circuit breakers / fuses. Other devices, however, connect via plugs and sockets. Some electrical devices, such as portable electronic devices (PEDs), may use plug cables with a plug at the end of the cable to connect and disconnect the device from the mains electricity supply, enabling portability. Such cables may also typically include a power converter to convert the AC electrical mains to direct current (DC) for input to the PED. Plug and socket configurations vary by region and country.

[0058] A "spa system" (also called a hot tub or jacuzzi) is a large tub or small pool filled with hot water used for hydrotherapy, relaxation, or pleasure, and may include powerful jets and water jets that provide whirlpools, bubbles, or a flow of clean water across the spa system to provide resistance to the user's exercise (such as swimming). Spa systems are typically designed to be used by more than one person at a time and are usually located outdoors, although they can be installed indoors.

[0059] As used herein and throughout the present disclosure, a "spa tub" refers to a wide, open, deep container having walls and a bottom in which the user(s) of the spa system sit, kneel, and / or lie. The geometric shape of a spa tub may be circular, oval, rectangular, square, or other geometric shapes, and the walls and / or bottom of the spa tub may include features including rims, seats, spa nozzles, bubble generators, and the like. Typically, spa tubs are made of fiberglass, but other materials may be used. A spa tub may be a tub, spa, hot tub, jacuzzi, swim spa, or bathtub without spa nozzles, etc.

[0060] As used herein and throughout the present disclosure, "housing" refers to the outer physical structure that supports the spa tub and provides a housing to present a visually pleasing exterior to the user while housing the pumps, heaters, tubes, manifolds, auxiliary pumps, etc. that form the spa pack and tube arrangement in the spa system.

[0061] As used herein and throughout the present invention, "fitting" refers to any machine component, pipe, or piping part that can attach or connect two or more parts. Such fittings may include, but are not limited to, one or more pipe couplings, compression fittings, tube fittings, conduit fittings, one or more pipe fittings, and electrical connectors.

[0062] As used herein and throughout the present disclosure, a "mount" refers to a part of a device, system, auxiliary equipment, etc. that is configured to support and / or attach another device, system, auxiliary equipment, component, etc. to the part of the device, system, auxiliary equipment, component, etc. Typically, a mount supports removable attachment of a part, but may also be used for permanent attachment to define the location of an attachment point or to support removable attachment prior to permanent attachment.

[0063] As used herein and throughout the present invention, "fixture" or "attachment device" refers to a component, device or device used to permanently or removably attach an apparatus, system, ancillary equipment, component, etc. to a part of another apparatus, system, ancillary equipment, component, etc. Depending on the permanent or removable nature and the material(s) being joined, this includes but is not limited to fasteners, glues, resins, epoxies, adhesives, welding, brazing, soldering, pressure differentials, magnets, clamps, clips, ties, supports, physical retaining elements such as clips and crimps, and physical retaining methods such as friction fits and interference fits. Fasteners may include but are not limited to bolts, nuts, washers, screws, threaded fasteners, rivets, nails, pins, hooks and eyes, and shackles.

[0064] As used herein and throughout the present invention, a "detachable" connection refers to a component, device, or device for permanently or detachably attaching an electrical or fluid connection on a device, system, auxiliary equipment, component, or the like to another electrical or fluid connection on another device, system, auxiliary equipment, component, or the like. Electrical "detachable" connections are typically formed by discrete, linear array or two-dimensional (2D) array format plug and receptacle arrangements or discrete male-female threaded connectors typically used for microwave and radio frequency applications. Fluid "detachable" connections are typically formed by male-female threaded connectors with O-ring, sealing ring, or gasket seals.

[0065] As used herein, "fluid" refers to a liquid, a gas, a mixture of liquids, or a mixture of gases.

[0066] As used herein and throughout the present invention, a "portable electronic device" (PED) refers to a wireless device used for communications and other applications that requires a battery or other independent form of energy to power it. This includes, but is not limited to, devices such as cellular phones, smartphones, personal digital assistants (PDAs), portable computers, pagers, portable multimedia players, portable game consoles, laptop computers, tablet computers, wearable devices, and e-readers.

[0067] As used herein and throughout the present invention, "fixed electronic device" (FED) refers to wireless and / or wired devices used for communications and other applications that require connection to a fixed interface for power. This includes, but is not limited to, laptop computers, personal computers, computer servers, kiosks, game consoles, digital set-top boxes, analog set-top boxes, Internet-enabled appliances, Internet-enabled televisions, and multimedia players.

[0068] As used herein, "user" may refer to, but is not limited to, an individual or group of individuals. This includes, but is not limited to, private individuals, employees of organizations and / or businesses, members of community organizations, members of charitable organizations, males and females. In its broadest sense, users may further include, but are not limited to, software systems, mechanical systems, robotic systems, android systems, and the like that can be characterized by utilizing the capabilities of one or more embodiments of the present invention. Users may be associated with biometric data that may be monitored, acquired, stored, transmitted, processed, and analyzed locally or remotely for the user, but is not limited to. Users may also be associated with one or more of service providers, third-party providers, businesses, social networks, social media, and the like through one or more accounts and / or profiles via dashboards, web services, websites, software plug-ins, software applications, and graphical user interfaces.

[0069] As used herein, "battery" (formally referred to as an electric battery) may refer to, but is not limited to, a device consisting of one or more electrochemical cells, with its positive terminal being a cathode and its negative terminal being an anode when the battery is supplying power, the electrochemical cell having external connections to power an electrical device such as a PED and FED. A battery may be a primary battery designed to be used until its energy is exhausted and then discarded, or a secondary battery that can be recharged after full or partial discharge to allow it to be used, recharged, and used again multiple times. Common primary battery types may include, but are not limited to, zinc-carbon and alkaline batteries. Common secondary battery types include, but are not limited to, lead-acid batteries, valve-regulated lead-acid batteries (VRLA, such as gel cells or absorbed glass mat batteries), nickel-cadmium (NiCd) batteries, nickel-zinc (NiZn) batteries, nickel-metal hydride (NiMH) batteries, and lithium-ion (Li-ion) batteries.

[0070] Reference Figure 1, depicts first through third images 100A through 100C of a typical home spa system commercially available today by retailers and original equipment manufacturers (OEMs). The first image 100A depicts the spa system as purchased and installed by a user, while the second image 100B depicts the spa system with the lower frame and housing removed. The third image 100C shows the spa system with the tub itself now removed, thereby revealing the mechanical elements and fluid components. Thus, the following elements are depicted:

[0071] Control system 105;

[0072] Pipeline 110;

[0073] Three-way valve 115

[0074] Blower 120;

[0075] Massage pump 125;

[0076] Suction inlet 130;

[0077] Light 135;

[0078] Hose 140;

[0079] rear nozzle 145; and

[0080] Manifold 150.

[0081] Also depicted:

[0082] Massage nozzles 155;

[0083] Air control element 160;

[0084] ·Circulation pump 165;

[0085] Control panel (for users) 170;

[0086] Skimmer 175;

[0087] Check valve 180;

[0088] Air nozzle 185; and

[0089] Water heater 190.

[0090] The powered components of a spa include: a water heater 190; at least one pump (circulation pump 165) for circulating water through the tubing interconnecting the water heater 190 and the bathtub; and a controller (control system 105) operable to control the circulation pump 165 (and massage pump 125) and the water heater 190 in response to input from the spa's owner, operator, or user. These components are often collectively referred to as a spa pack. The spa pack is typically connected to the main power source via a ground-fault circuit interrupter (GFCI) cable. If a ground fault is detected, the GFCI disconnects electrical communication between the spa pack and the power source, eliminating a potential shock hazard to the user(s). This can be problematic when using the spa in winter, because if the GFCI cuts off power to the spa pack and the spa system is left unattended, water (particularly in the circulation tubing, pump(s), heater, and distribution manifold(s)) can quickly freeze and damage the spa. Sometimes, during cold weather seasons, cottage owners sometimes leave their spas unattended for extended periods of time while they are operating, for example. Cottage owners travel back and forth between their country cottages and urban environments and leave their cottage spas running between visits during the winter to prevent freezing. If the GFCI trips while they are away, they may return to their cottage spa on their next vacation to find it frozen.

[0091] Alternatively, the mains power may fail, where the GFCI may not trip, but the circuit breaker at the internal mains distribution panel may trip, removing power. In other scenarios, the water heater 190 may malfunction if the cap is used incorrectly or not at all, the circulation pump 165 may stall or malfunction, or the pipes / skimmer may become clogged with debris. Of course, in some cases, cables may accidentally become disconnected from the spa system, as well as fuses that blow, pumps that stick, heater failures, power surges, etc.

[0092] Now refer to Figure 2 , depicting current retailer and OEM commercial sales (such as Figure 1 FIG20 is a first image 200A and a second image 200B of the physical configuration of a typical home spa system (as described and depicted in FIG20 and the first through third images 100A through 100C). It is apparent that the spa pack, controller, plumbing, etc. are housed within a housing that is not much larger than the actual bathtub itself, so the additional space between the bathtub liner and the outer housing is not significant.

[0093] FIG3 schematically depicts the power and control configuration for a typical home spa system according to the prior art, wherein a spa system 350 including a tub 340 is fluidly coupled to a pump 370 and a heater 380. For clarity, all auxiliary components, such as distribution piping, nozzles, manifolds, etc., are not depicted. Pump 370 and heater 380 are electrically coupled to a controller 360, which is coupled to a GFCI 310 via a cable 330. In FIG3 , a weatherproof electrical outlet (WES) 320 to which cable 330 is coupled is depicted, but in other embodiments of the present invention, cable 330 may be coupled directly to controller 360. Consequently, spa system 350 is not protected from freezing.

[0094] Referring now to FIG. 4 , a schematic diagram illustrates a backup pump configuration for a typical home spa system according to the prior art by Miller (U.S. Patent 8,621,678). Thus, a spa system 450, including a tub 440, is fluidly coupled to a pump 470 and a heater 480. For clarity, not all auxiliary components, such as distribution piping, nozzles, manifolds, etc., are depicted. The pump 470 and heater 480 are electrically connected to a controller 460, which is coupled to a GFCI 410 via a first cable 430. However, an auxiliary pump 490, including an auxiliary pump and an auxiliary heater (not depicted separately for clarity), is also provided.

[0095] 4 , a first cable 430 is depicted connected to a first WES 420, but in other embodiments of the invention, the cable 430 may be directly connected to the controller 460. A second WES 425 is also depicted as being coupled to the controller 460, connected to the second GCFI 415 via a second cable 435, but in other embodiments of the invention, the cable 430 may be directly connected to the controller 460. As taught by Miller of North America, with a single-phase 110 / 120V power supply, the first circuit of which the first WES 420, the first GCFI 410, and the first cable 430 form a part is a 220 / 240V circuit (implemented by utilizing both phases of the mains power) that provides power to operate the heater 480 and the pump 470. The second circuit of which the second WES 425, the second GCFI 415, and the second cable 435 form a part is a 110 / 120V circuit. If the first power source is active along with the second power source, the first circuit provides the required power to the controller 460, pump 470, and heater 480. However, a failure of the first power source by triggering the first GFCI 410 causes the relay in the spa system 450 to actuate from an initial state (e.g., connected or not connected) to another state (e.g., not connected or connected), thereby engaging the second circuit. Since the second circuit is intended only to prevent the water in the spa system 450 from freezing, rather than heating it to normal operating temperature through the nozzles, etc., the auxiliary pump 490 does not require the same electrical requirements and is therefore driven by standard 110 / 120V electrical mains power.

[0096] However, Miller's teachings do not address situations such as a pump 470 failure or a heater 480 failure, because the determination of whether the auxiliary pump 490 is engaged is determined solely by the input electrical signals from the first and second circuits. Therefore, if the first GFCI 410 does not "trip" and disconnect the 220 / 240V signal under 220 / 240V power, the relay within the circuit will remain in its normal state, causing the bypass valve (not depicted for clarity) to not engage, and thus, the water flow from the pump 470 and heater 480 to the auxiliary pump 490 and then to the tub 440 is not redirected. Miller does not take into account any control from the controller 460 or any other means other than electrical input power.

[0097] Therefore, in order to create a system with improved tolerance to various failure mechanisms, the inventors have developed a different design approach for a hydrotherapy system. Figure 5, illustrates a backup system for a typical home spa system according to an embodiment of the present invention. Thus, as depicted, a first GFCI 510 connects a first cable 520 to a first portion of an electrical connector 530, while a second GFCI 515 connects a second cable 525 to a second portion of the electrical connector 530. The first portion of the connector 530 is connected to a controller 560, which is connected to a pump 570 and a heater 580, and thus functions in a manner similar to that described with respect to FIG. 4 and the prior art. The second portion of the electrical connector 530 is connected to an auxiliary heater 590, which is connected to a power source different from that used to power the pump 570 and heater 580 via a second cable 525 and a second GFCI. Alternatively, the first and second circuits may be routed through different electrical connectors rather than a single electrical connector 530. The auxiliary heater 590 may be a forced-air electric heater that heats the area between the lower surface of the tub 540 and the outer housing of the spa system 550. In some embodiments of the present invention, upon detecting a failure in the first circuit and / or detecting that the temperature within the spa system is below a predetermined threshold temperature (setpoint temperature), the second circuit is engaged.

[0098] A low complexity approach is to use a secondary circuit and / or auxiliary heater 590 which includes a setting of 40°F

[0099] A thermostat (not depicted for clarity) is set to a low (approximately 5°C) and then, when the detected temperature drops below 40°F, the auxiliary heater 590 automatically turns on. Thus, the auxiliary heater 590 will operate regardless of whether the first circuit is energized or de-energized, and regardless of whether the pump 570 and heater 580 are operating. Alternatively, rather than an electrical thermostat providing a control signal, the auxiliary heater 590 is coupled to the second circuit via one or more mechanical temperature switches, such as those utilizing a bimetallic element for electrical connection or contacting a conductive fluid (e.g., mercury). Alternatively, a mechanical switch based on mechanical expansion / contraction in response to temperature, such as a so-called "snap-disk" or "snap-action" thermostat, may be employed. Alternatively, the first circuit may be disconnected by a mechanical temperature-dependent switch, disconnecting the heater 580 and / or pump 570, either independently or in combination with the controller 560.

[0100] Alternatively, the electrical connector 530 (rather than a single housing with dual electrical interfaces) can be a pair of separate electrical connectors, each of which is a separate electrical interface (eg, a plug or a receptacle).

[0101] Now refer to Figure 6 , depicts a backup system for a typical home spa system according to an embodiment of the present invention. As depicted, the physical configuration is similar to Figure 5The depicted embodiment is essentially the same, except that a backup battery 610 has been added, located within the second circuit, before the auxiliary heater 590. The backup battery 610 can be, for example, a primary battery designed to be replaced after use, or a secondary battery designed to be recharged through a so-called "trickle" charging process and retain its charge in the event that, in some embodiments of the present invention, a fault in the first circuit is detected and / or the temperature within the spa system is detected to be below a predetermined threshold temperature (setpoint temperature). Thus, consider that the thermostat activates power to the auxiliary heater 590, and then, upon detecting a temperature below the thermostat's setpoint temperature, couples the auxiliary heater 590 to the first circuit, which now includes the backup battery 610. Thus, if the second circuit is energized, the auxiliary heater 590 will operate from the electrical mains, but in the event of a fault in the second circuit (e.g., a power failure (commonly referred to as a power outage)), the backup battery 610 will provide power to the auxiliary heater 590.

[0102] It will be apparent that a system utilizing battery backup 610 can provide protection even in the event of a failure (e.g., loss of power) in the event of a fault such as a tripping of a main circuit breaker associated with the spa system, multiple circuit breakers associated with the spa system, the mains power supplied to the spa system, and / or its associated properties.

[0103] Since the auxiliary heater 590 is intended to maintain a temperature sufficiently above freezing to protect the fluid system (e.g. Figure 1 The depicted bathtub 540 and auxiliary components (such as the piping 110, nozzle hose 140, rear nozzle 145 and manifold 150) are included, rather than heating water for use in the spa system 550, thereby significantly reducing power requirements. Figure 2 As is apparent from both the first and second images 200A and 200B, the total volume of air being heated is relatively small. It is also apparent that increasing insulation on the exterior walls of the spa system 550 may be beneficial in further reducing heat losses during the initial operation and operation of the auxiliary heater 590. Similarly, utilizing higher quality spa system 550 coverings (including those commonly referred to as "sun covers" or "sun blankets" to take advantage of available sunlight) may further delay the onset of power to the auxiliary heater 590 or the length of time the auxiliary heater 590 may operate.

[0104] In other embodiments of the present invention depending on the design of the spa system 550, the auxiliary heater 590, either separately or in combination with the backup battery 610, can be a feature of the spa system 550 when purchased by the user or alternatively added later as a user upgrade or retrofit option. In either case, the auxiliary heater 590 and / or the backup battery 610 can be designed with the spa system 550 to be installed within the spa system 550 cavity between the tub 540 and the outer housing of the spa system 550. Alternatively, the auxiliary heater 590 and / or the backup battery 610 can be designed with the spa system 550 as an additional housing with conduit and / or openings between the additional housing and the cavity below the tub 540. With a separate auxiliary heater 590 and an insulated conduit connection between the auxiliary heater 590 and the spa system 550, the options for powering the auxiliary heater 590 increase to include, for example, a propane gas-based heater, a diesel generator-based heater, a gasoline generator-based heater, and the like. The auxiliary heater 590 may be a forced air heater, an electric element heater, an electric belt heater, a heat lamp, an infrared heat lamp, etc. Alternatively, the backup battery 610 may be replaced with a generator to provide power to the auxiliary heater 590, where the generator is engaged based on, for example, a thermostat within the chamber of the spa system 550 or within the fluid system of the spa system 550. Such a generator may, for example, utilize a fuel such as oil, gasoline, or diesel.

[0105] Now refer to Figure 7 , based on a common housing for receptacles for the first and second circuits (where the circuits are wired from the GFCI via a cable with a plug at either end, or "hardwired" to the GFCI) Figure 5 and 6 The depicted configuration depicts an exemplary spa system power interface according to an embodiment of the present invention. Thus, in the first through fourth images 700A through 700D, a weatherproof electrical outlet (WES) housing is depicted as:

[0106] First image 700A—front view, with weather cover attached (or closed);

[0107] • Second image 700B - front view, with weather cover removed (open or not shown for clarity);

[0108] • Third image 700C - rear view; and

[0109] • Fourth image 700D - Bottom view, with weather cover attached (or closed).

[0110] Thus, a weatherproof electrical outlet (WES) includes a cover 780, a body 790, and an opening 795. The opening allows for wiring of cables into the WES, and the cover 780 is attached or closed depending on the design of the WES. The cover 780 is shown in first image 700A as being transparent, at least in area 785, to allow a user to see first and second lights 730, 740, which illuminate depending on, for example, the status of the first and second circuits and / or the status of the spa system. Similarly, within the front of the body 790 are first and second electrical receptacles 710, 720 (which comply with local regulations regarding the provision of electrical receptacles / plugs for electrical mains). Additionally, within the front of the body 790 is a wireless interface module 750 with an optional indicator 755. A third and fourth electrical receptacles 760, 770 are provided on the rear of the body 790.

[0111] Therefore, according to an embodiment of the present invention, when the auxiliary heater is not on, the first light 730 illuminates (e.g., green) to indicate to the user viewing the WES that the spa system is in normal "standby" or "sleep" mode to maintain the water temperature above the set point. However, activating the auxiliary heater for any reason will trigger the second light 740 to illuminate (e.g., red) while the first light 730 is off. Thus, the user viewing the WES will see a red light, indicating an alarm condition, such as a lack of power in the first circuit (e.g., a triggered GFCI) or a pump and / or heater failure. Alternatively, the first light 730 and the second light 740 can each be a single light capable of illuminating in two or more colors (e.g., green and red). If the first and second lights 730, 740 are powered solely by the second circuit, a failure in the second circuit will cause both the first and second lights 730, 740 to be unlit, indicating to the user viewing the WES that there is no power at all.

[0112] Obviously, other colors may be used, either individually or in combination, for the first and second lights 730, 740. In situations where snow accumulation is anticipated, an auxiliary light stand coupled to the WES may be used that raises the height of the other pair of lights to a predetermined height above the ground and / or the top of the spa system to improve visibility of the lights under snow.

[0113] The wireless interface module (WLESS-IM) 750 with optional indicator 755 can itself be an optional feature of the WES. In alternative embodiments of the present invention, the WIM 750 can be powered separately by the second circuit, separately by the first circuit, or by a combination of the first and second circuits. The WLESS-IM 750 can operate in accordance with one or more wireless standards selected from, but not limited to, IEEE 802.11, IEEE 802.15, IEEE 802.16, IEEE 802.20, UMTS, GSM850, GSM900, GSM1800, GSM1900, GPRS, ITU-R 5.138, ITU-R 5.150, ITU-R 5.280, and IMT-1000, which may or may not be routed through a router associated with the spa system location before accessing the communications network or global communications network. Alternatively, WLESS-IM may utilize a wireless method based on optical communications rather than microwave or radio frequency based wireless methods.

[0114] Alternatively, in other embodiments of the present invention, the WLESS-IM may be enhanced, combined with, or replaced by a WED-IM (not depicted in the figures) that may operate in accordance with one or more wired standards selected from, but not limited to, DSL, dial-up, DOCSIS, Ethernet, G.hn, ISDN, MoCA, PON, and power line communications (PLC), which may or may not be routed through a router associated with the spa system location before accessing the communications network or global communications network.

[0115] WLESS-IM (or WED-IM) can push status information to one or more cloud-based services, from which it can be pushed to one or more PEDs / FEDs using a software application. This software application (app) can provide continuous updates to the user(s), or it can provide updates only when conditions change (such as triggering an auxiliary heater and, for example, triggering a backup battery). Optionally, the cloud-based services to which WLESS-IM (or WED-IM) pushes updates can include alarm monitoring services (to indicate issues requiring attention) or triggering emergency service calls to spa system maintenance / service companies. WLESS-IM or WED-IM can establish communications via one of a number of communication networks, including the World Wide Web or the Internet.

[0116] Optionally, WLESS-IM and / or WED-IM according to embodiments of the present invention can be connected to one or more cloud-based services and therein to one or more PED / FEDs using software applications to allow a user to change one or more settings of the system during normal operation (e.g., changing the set point temperature, operating the system from standby mode, etc.) and allow a user to monitor aspects of the system (including monitored temperatures, alarm status, etc.).

[0117] Optionally, the WLESS-IM and / or WED-IM according to embodiments of the present invention may be coupled to a backup battery or other device for storing electrical energy (e.g., a fuel cell), allowing the WLESS-IM and / or WED-IM to operate in the event of a total power failure to the spa system, thereby allowing a final status message to be sent.

[0118] Reference Figure 8 , depicting a first image 800A and a second image 800B of a weatherproof electrical outlet (WES) providing a power interface for a spa system, in accordance with an embodiment of the present invention. Figure 7 Compared to the depicted WES, discrete first and second electrical receptacles 810, 820 are disposed on the front of the body, and discrete third and fourth electrical receptacles 860, 870 are disposed on the rear of the body.

[0119] Now refer to Figure 9 , depicting a first image 800A and a second image 800B of a weatherproof electrical outlet (WES) providing a power interface for a spa system, in accordance with an embodiment of the present invention. Figure 7 The WES depicted is opposite to but different from Figure 8 The WES depicted is identical to the one depicted, with separate first and second electrical sockets 910, 920 provided on the front of the body. Figure 7 and Figure 8 In contrast to the WES in the , only a single third electrical socket 940 is provided at the rear of the main body for installing an auxiliary heater as an upgrade / retrofit, with the controller etc. being hardwired to the WES via cable 930.

[0120] Now refer to Figure 10A , depicts a first image 1000A and a second image 1000B of a weatherproof electrical outlet (WES) providing a power interface for a spa system according to an embodiment of the present invention. In this embodiment of the present invention, the WES is provided separately from the first circuit and the normal pump / heater / control system of the spa system. Thus, Figure 10AThe WES depicted in FIG can be an upgrade / retrofit installed separately from another WES that provides an interface for the first circuit. As depicted in first image 1000A, which represents a front view with the protective cover removed (open or not shown for clarity), the front panel includes a first electrical socket 1020 and a first light 730 and a second light 740. A second electrical socket 1040 is provided at the bottom of the WES for connection to an auxiliary heater. In this embodiment, the WES may or may not include a wired and / or wireless interface.

[0121] Now refer to Figure 10B , depicting first to third images 1000C to 1000E, respectively, of a weatherproof electrical outlet (WES) providing a power interface for a spa system according to an embodiment of the present invention. Figure 10A The embodiment of the invention depicted is the same, with the WES being provided separately in relation to the first electrical circuit and the normal pump / heater / control system of the spa system. As depicted in the first to third images 1000C to 1000E respectively, a front view with the cover attached (or closed), a front view with the cover removed (open or not shown for clarity) and a rear view are depicted respectively. Thus, on the front there is provided a first electrical socket 1020 for the power cable plug of the second electrical circuit, a first light 730 and a second light 740 and a wireless interface module 750 with an optional indicator 755. In the rear there is provided a second socket 1030 for connecting an auxiliary heater either directly or via a backup battery. In the front at least a portion 1010 of the cover is made clear (transparent) to allow the first light 730 and the second light 740 to be visible to a user remote from the spa system. Optionally, these lights are located on an outer surface of the WES. Optionally, although reference has been made to above Figures 7 to 10B Rectangular and / or square WES housings are discussed and depicted, but other geometries can be employed, including but not limited to circular. A circular geometry can be employed to insert an opening cut with a circular blade into the side wall of the housing of the hydrotherapy system.

[0122] It will be apparent that while embodiments of the present invention are presented through the specific design of a WES, embodiments of the present invention can be implemented with a range of weatherproof electrical receptacles, with or without covers, and with varying electrical receptacles and / or wired interfaces, depending on the permitted configuration of electrical mains within the spa system deployment location. If regulations support a 2-pin or 2-pin + ground (3-pin) connection, it is expected that most deployments will be 3-pin (including the ground connection). In other embodiments of the present invention, rather than having the receptacle provided within the WES to mate with a plug, a plug can be employed to which the receptacle is mounted. In other embodiments of the present invention, the WES can route cables from the WES to the electrical device(s) within the spa system cavity and / or route cables externally, with the WES providing visible indicators and housings for wireless and / or wired communication interfaces.

[0123] It will further be apparent that embodiments of the present invention utilizing a WES may utilize a WES that is inserted into and attached to the housing of a spa system via one or more mounting devices and / or accessories, or the WES may be mounted to the housing of a spa system via one or more mounting devices and / or accessories.

[0124] Although embodiments of a WES have been described in which the mains electrical input is to the front of the WES and the output electrical connection(s) are connected to an auxiliary heater, spa pack, etc. at the rear, it will be apparent that in the case of a rectangular WES the output electrical connection(s) may be provided on one of the other sides of the WES (such as the top, bottom, left or right surface) and in the case of other geometric shapes (such as triangles, hexagons, etc.) may be provided on a face of the WES.

[0125] Now refer to Figure 11 , depicts an exemplary flow chart of a control system for managing power failures in a spa system, according to an embodiment of the present invention. Thus, the process begins at step 1105, where the temperature of, for example, the spa system cavity and / or water is monitored. At step 1110, a determination is made as to whether a problem has been detected, such that the monitored temperature is now below a threshold temperature or temperature set point, wherein if the temperature is low, the process proceeds to step 1115; otherwise, it proceeds to step 1105.

[0126] In step 1115, a determination is made as to whether a backup power source is present for the first circuit, wherein an affirmative determination causes the process to proceed to step 1120 and a determination is made as to whether a generator or battery-based backup is present. A generator determination causes the process to proceed to step 1125 and turn on the generator, and if it starts, a determination is made as OK in step 1130, wherein a successful start causes the heater and pump to operate in step 1135, and the process loops back to step 1105 to monitor again.

[0127] If there is a problem with the generator option, the process proceeds from step 1130 to step 1140 to determine if a backup battery is present. If not, the process loops to step 1150, otherwise proceeds to step 1145 and operates the pump, heater, etc. from the backup battery. Step 1150 is also reached if the process determines in step 1115 that a backup power source is not present to maintain full operation of the spa system in standby or sleep mode. Thus, in step 1150, a determination is made as to whether an auxiliary heater is installed, with an affirmative determination resulting in the auxiliary heater being operated and the process proceeding to step 1155. A determination that the auxiliary heater is not connected causes the process to proceed to step 1160 and initiate an emergency drain before terminating the process at step 1165.

[0128] In an embodiment of the present invention, an emergency drain protocol may be initiated when the temperature monitored by the backup system drops below a predetermined threshold such that, in the event of a heater failure, insufficient backup power to power the heater, an unexpected disconnection of the heater subsystem, or even the absence of a heater, the backup system should trigger the heater. In an embodiment of the present invention, the emergency drain may be separate from the active monitoring and may be a passive mechanism that is set to trigger when the temperature drops below a predetermined temperature, thereby automatically draining the spa if the temperature drops below the predetermined threshold, thereby preventing freezing. For example, the active system may be set to trigger at 10°C, while the passive emergency drain may be set at 5°C.

[0129] In an embodiment of the present invention, the first sub-process 1100A including steps 1110 to 1145 may be in a controller of a spa system (eg, Figure 1 The second sub-process 1100B including steps 1150 to 1165 may be controlled by a second controller. The second controller may be located, for example, within a WES including the second circuit, since a controller will typically be required to control wireless and / or wired interfaces.

[0130] In embodiments of the present invention, the first and second circuits have been described as being separate with the first circuit being for the main spa pack with a pump and heater, and the second circuit being for the auxiliary heater. Figure 12An exemplary control configuration for a spa system according to an embodiment of the present invention is depicted. As depicted, a first line 1210 connects to a first portion of the circuit, where power is tapped by a first AC-DC converter 1240A and fed to a controller 1250. The first line L1 1210 is also coupled to a first switch SW1 1230A and a second switch SW2 1230B, which are controlled by control lines from the controller 1250. The outputs of the first and second switches SW1 1230A and SW2 1230B are coupled to a third and fourth switches SW3 1230C and SW4 1230D, respectively, while a second line 1220 connects to a second portion of the circuit, including a fifth and sixth switches SW5 1230E and SW6 1230F, respectively. Each of the third and sixth switches SW3 1230C through SW6 1230F is coupled to the controller 1250 via a control line. The controller 1250 is also coupled to L2 1220 via the second AC-DC converter 1240B.

[0131] Accordingly, in the first mode, using power supplied from L1 1210 to controller 1250, first switch SW1 1230A and second switch SW2 1230B are driven to couple L1 1210 to third switch SW3 1230C and fourth switch SW4 1230D, which are also switched to couple L1 1210 to pump 1260 and heater 1270. In the event of a failure of L1 1210, controller 1250 detects this by monitoring the DC input from first AC-DC converter 1240A and now receives power from L2 1220 via second AC-DC converter 1240B. As a result, controller 1250 adjusts the control signals for switches S3 1230C through S6 1230F, respectively, so that L2 1220 is now coupled to pump 1260 and heater 1270. If L2 1220 is a mains power source similar to L1 1210, the spa system can continue to operate in all modes. However, if L2 1220 is a mains power source with a lower capacity than L1 1210, controller 1250 may only support some of the spa system's operating modes. This can be automatically detected by controller 1250 monitoring the voltage from second AC-DC converter 1240B. If the spa system was set to sleep / standby or winterization mode before the L1 1210 fault occurred, it can remain in these modes as if nothing had happened. However, controller 1250 can now trigger wired and / or wireless communication via the corresponding wired and / or wireless interfaces to indicate the fault on L1 1210. Optionally, an indicator light on the spa system can also reflect this condition.

[0132] If the controller 1250 detects a failure in one or the other of the pump 1260 and heater 1270, it can similarly trigger communication regarding the failure or failures and default control to a sleep / standby or winter protection mode, wherein the fifth switch SW5 1230E and the sixth switch SW6 1230F are set to couple L2 1220 to the auxiliary heater 1280. The fifth switch SW5 1230E and the sixth switch SW6 1230F can default to this configuration in the absence of a control signal from the controller 1260, so that if there is a problem with the controller 1250, the freeze protection is automatically engaged, regardless of the previous setting(s). Further, through thermostat control of the auxiliary heater 1280 as described above, it will automatically turn on when the set point temperature for freeze protection is reached.

[0133] Therefore, compared to the solution taught by Miller, Figure 12 The configuration depicted in eliminates the need for additional pumps, heaters, bypass valves, and additional piping. Figure 12 The configured operation supports multiple "backup" modes by supporting the use of the L2 1220 in conjunction with a standard spa package (pump 1260 and heater 1270) or an auxiliary heater 1280. Providing a battery backup module to the controller 1250 can allow the controller 1250 to send data to the wired and / or wireless interface within the WES through which the L2 1220 is connected.

[0134] Optionally, the wired and / or wireless interface can be in continuous communication with the controller 1250, allowing the user to remotely access the current status of the spa system, rather than simply receiving alerts or warnings. Alternatively, for example, a remote user can lock the spa system into sleep or standby mode through the app, thereby controlling the spa system to "disable" the spa system in the event of unauthorized operation. Similarly, where two-way communication between the remote user and the app executing the electronic device to / from the controller is supported, the user can turn on the spa system to heat it up before their arrival.

[0135] In About Figures 5 to 12In the embodiments of the invention described and depicted, the backup system(s) have been described from the perspective of monitoring the temperature of a fluid (e.g., water) to determine when to trigger the operation of the auxiliary heater. However, in other embodiments of the invention, the temperature monitored and used as the basis for the determination may be the temperature of one or more tubes carrying a circulating fluid (e.g., water), or the temperature of the air within one or more cavities within the hydrotherapy device. Alternatively, it may be multiple measurements and multiple measured objects, such as tube temperature and fluid temperature. For example, the temperature sensor may be strapped to the outside of the tube but with any insulation applied to the inside of the tube, or the temperature sensor may be strapped to the outside of the tube and with any insulation applied to the outside of the tube, or the temperature sensor may be inserted through a manifold or sealed interface to measure the fluid (water) temperature. Alternatively, the temperature sensor may be formed within a dedicated fitting for the system (such as a pipe interface) so that the pipe is connected to either side of the pipe interface having the temperature sensor, or connected to a small metal plate molded into the body of the system that comes into contact with the fluid (e.g., water).

[0136] In About Figures 5 to 12 In the embodiments of the present invention described and depicted, the backup system(s) have been described from the perspective of monitoring the temperature of a fluid (e.g., water) to determine when to trigger operation of the auxiliary heater. However, in other embodiments of the present invention, the system can provide an initial heating sequence for the spa system such that during an initial fill operation or a refill operation, surfaces of the spa system are heated, thereby preventing freezing or reducing the extent of freezing during a freeze operation and preventing the spa system from operating until a threshold temperature is exceeded.

[0137] Alternatively, in embodiments of the present invention, an electric heater in the form of a belt, pad, or other geometric shape may be employed that contacts a predetermined portion of the housing of the spa system (e.g., the area at the bottom of the spa system) or one or more tubes within the spa circulation system.

[0138] In other embodiments of the present invention, temperature monitoring can be linked to a weather service, allowing both current and projected temperatures to be factored into trigger decisions. For example, if the fluid and pipe temperatures are below their respective triggering temperatures and the weather forecast indicates that the temperatures have reached a minimum and are increasing, triggering of the backup / protection system can be suspended for a predetermined period of time. Alternatively, if the fluid and pipe temperatures are above their respective triggering system temperatures but below a second, slightly higher threshold, and the weather forecast indicates stable or lower temperatures, the backup / protection system can be triggered at maximum or reduced output.

[0139] Specific details are provided in the above description to provide a thorough understanding of the embodiments. However, it will be understood that the embodiments may be practiced without these specific details. For example, circuits may be shown in block diagrams to avoid obscuring the embodiments with unnecessary detail. In other cases, well-known circuits, processes, algorithms, structures, and techniques may be shown without unnecessary detail to avoid obscuring the embodiments.

[0140] The implementation of the above-mentioned techniques, blocks, steps and devices can be accomplished in various ways. For example, these techniques, blocks, steps and devices can be implemented in hardware, software or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, other electronic units designed to perform the above-mentioned functions and / or combinations thereof.

[0141] Additionally, it is noted that embodiments may be described as processes depicted as flowcharts, flow diagrams, data flow diagrams, structure diagrams, or block diagrams. Although flowcharts may depict operations as sequential processes, many operations may be performed in parallel or simultaneously. Furthermore, the order of operations may be rearranged. When the operations of a process are completed, the process terminates, but the process may have additional steps not included in the diagram. A process may correspond to a method, function, procedure, subroutine, subprogram, etc. When a process corresponds to a function, its termination corresponds to the function returning to the calling function or main function.

[0142] The foregoing disclosure of exemplary embodiments of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Numerous variations and modifications of the embodiments described herein will be apparent to those of ordinary skill in the art in light of the foregoing disclosure. The scope of the present invention is defined solely by the appended claims and their equivalents.

[0143] Further, when describing representative embodiments of the present invention, the specification may have presented the method and / or process of the present invention as a specific order of steps. However, to the extent that the method or process does not rely on the specific order of steps set forth herein, the method or process should not be limited to the specific order of steps described. As will be understood by those of ordinary skill in the art, other orders of steps are possible. Therefore, the specific order of steps set forth in the specification should not be interpreted as a limitation on the claims. In addition, claims for the method and / or process of the present invention should not be limited to performing their steps in the order written, and those skilled in the art can readily understand that the order can be changed and still remain within the spirit and scope of the present invention.

Claims

1. A system for freeze-protecting a spa system, the system comprising a spa tub, a fluid circuit including a controller coupled to a powered component of the spa system, and the powered component of the spa system coupled to a mains power interface for powering the powered component of the spa system and a housing supporting the spa tub, the system comprising: a control unit coupled to the temperature sensor for activating a heater that does not form part of the powered component of the spa system when a reading received by the control unit from the temperature sensor indicates that a temperature of air within a cavity between the housing and the spa tub of the spa system has fallen below a predetermined threshold, regardless of a state of the fluid circuit that forms part of the spa system.

2. The system for freeze protection of a hydrotherapy system according to claim 1, wherein The heater and the control unit are coupled to another mains power interface; and Any of the following: the heater being within another cavity formed between the housing of the spa system and the spa tub and, when activated by the control unit, heating air within the another cavity and at least one of a conduit forming part of the spa system and the spa tub therein; or: The heater is external to another cavity formed between the housing of the spa system and the spa tub and is coupled to the other cavity via at least one of an opening in the housing of the spa system and a conduit leading from the heater to the other cavity, and when activated by the control unit, the heater heats air within the other cavity and at least one of a conduit forming part of the spa system and the spa tub within the other cavity.

3. The system for freeze protection of a spa system according to claim 1, further comprising the heater, the heater being selected from the group consisting of a forced air heater, an electric element heater, and a heat lamp; and The heater is within another cavity formed between the housing of the spa system and the spa tub, and when activated by the control unit, the heater heats at least one of: air within the cavity and at least one of the tubing forming part of the spa system and the spa tub therein within the other cavity; and At least one of a conduit forming part of the spa system and the spa tub is within the other cavity.

4. The system for freeze protection of a spa system according to claim 1, wherein The heater and the control unit are coupled to another mains power interface; and The control unit provides at least one of the following: When the temperature is below the predetermined threshold, issuing a control signal to the heater to turn on the heater, or when the temperature is below the predetermined threshold, performing a mechanical switch to connect the other mains power interface to the heater; an electrical interface for coupling to the further power main to provide power to the heater and the control unit; visual indication means for displaying to a user at least one of the status of the further mains power interface and the status of the heater; and An interface supports communication with a communications network to send a message to a remote user on an electronic device also connected to the communications network regarding at least one of the status of the mains power interface, the condition of the other power interface, and the status of the heater.

5. The system for freeze protection of a spa system according to claim 1, wherein At least one of the following: the heater and the control unit being coupled to another mains power interface that provides power to the heater and the control unit regardless of a state of the controller of the spa system and regardless of a state of the power mains interface that powers the powered components of the spa system; the control unit enabling the heater and disabling the fluid circuit when the temperature monitored by the temperature sensor is below the predetermined threshold; and The system further comprises one or more mechanical temperature dependent switches, wherein The one or more mechanical temperature dependent switches disconnect the mains power interface from at least one of another heater forming part of the spa system, a pump forming part of the spa system, and a controller forming part of the spa system.

6. The system for freeze protecting a spa system according to claim 1, further comprising At least one of the following: a further temperature sensor for activating the heater that does not form part of the powered component of the spa system when a reading received by the control unit from the further temperature sensor indicates that the temperature of water within the spa system has fallen below a further predetermined threshold, regardless of the state of the fluid circuit that forms part of the spa system, a still further temperature sensor for activating the heater that does not form part of the powered component of the spa system when a reading received by the control unit from the still further temperature sensor indicates that the temperature of the tubing forming part of the spa system has fallen below a still further predetermined threshold, regardless of a state of the fluid circuit forming part of the spa system.

7. The system for freeze protecting a spa system according to claim 1, wherein At least one of the following: the control unit triggering the heater independently of the state of the controller forming part of the spa system, thereby enabling an initial heating sequence of the spa system to be established during an initial filling operation or a refilling operation; the control unit inhibiting operation of the hydrotherapy system until the predetermined threshold temperature is exceeded; the control unit obtains a weather forecast from a weather service including a current temperature and a predicted temperature, and employs these to modify activation of the heater by suspending activation of the heater for a predetermined period of time if the weather forecast indicates that the current temperature has reached a minimum value relative to the predicted temperature; The control unit obtains weather forecasts including current and projected temperatures from a weather service and uses these to modify activation of the heater by, The heater is triggered when a reading received by the control unit from the thermostat indicates that the current temperature is below another predetermined threshold temperature, the another predetermined threshold temperature is above the predetermined threshold temperature, and the weather forecast indicates that the expected temperature is below the predetermined threshold temperature or the another predetermined threshold temperature, wherein The heater is operated at or below a maximum output of the heater.

8. A system for freeze-protecting a spa system, the system comprising a spa tub, a fluid circuit including a controller coupled to a powered component of the spa system, and the powered component of the spa system coupled to a mains power interface for powering the powered component of the spa system and a housing supporting the spa tub, the system comprising: a forced air heater, said forced air heater not forming part of said powered component of said spa system, for coupling to a control unit; in The forced air heater is activated by the control unit when readings received by the control unit from a temperature sensor indicate that the temperature of the air within the cavity between the housing and the spa tub of the spa system has fallen below a predetermined threshold, regardless of the state of the fluid circuit forming part of the spa system.

9. The system for freeze-protecting a spa system according to claim 8, wherein said forced air heater and said control unit being coupled to another mains power interface; and Any of the following: the forced air heater being within another cavity formed between the housing of the spa system and the spa tub and, when activated by the control unit, heating air within the another cavity and at least one of ducting forming part of the spa system and the spa tub therein; or: The forced air heater is external to another cavity formed between the housing of the spa system and the spa tub and is coupled to the other cavity via at least one of an opening in the housing of the spa system and a conduit leading from the forced air heater to the other cavity, and when activated by the control unit, the forced air heater heats air within the other cavity and at least one of ducting forming part of the spa system and the spa tub within the other cavity.

10. The system for freeze protecting a spa system according to claim 8, wherein The forced air heater is connected to another mains power connection via one or more electrical switches; and When the control unit forms part of the powered component of the spa system, the one or more electrical switches connect the forced air heater to the further mains power interface in the absence of a control signal received from the control unit.

11. The system for freeze protecting a spa system according to claim 8, wherein At least one of the following: the forced air heater and the control unit being coupled to a further mains power interface that provides power to the forced air heater and the control unit independently of a state of the controller of the spa system and independent of a state of the power mains interface that powers the powered components of the spa system; The control unit activates the forced air heater and disables the fluid circuit when the temperature monitored by the temperature sensor is lower than the predetermined threshold.

12. The system for freeze protecting a spa system according to claim 8, further comprising At least one of the following: another temperature sensor for activating the forced air heater, which does not form part of the powered component of the spa system, when a reading received by the control unit from the another temperature sensor indicates that the temperature of water within the spa system has fallen below another predetermined threshold, regardless of the state of the fluid circuit forming part of the spa system, a still further temperature sensor for activating the forced air heater that does not form part of the powered component of the spa system when a reading received by the control unit from the still further temperature sensor indicates that a temperature of tubing forming part of the spa system has fallen below a still further predetermined threshold, regardless of a state of the fluid circuit forming part of the spa system.

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