158 results about "Aquastat" patented technology

A gas furnace responsive to a thermostat includes a thermal switch wired in series between the furnace power supply and the thermostat. A microprocessor connected to the thermal switch detects when the switch opens and closes, carrying out prearranged programs in response thereto. The thermal switch is mounted so that it opens when an over-pressure in the furnace draft system is detected, as evidenced by hot flue gasses passing over the thermal switch probe. The switch is allowed to cycle at least one time before the furnace is disabled. After a certain period of the time, the combustion cycle is reinitiated and the above steps are repeated if the thermal switch again resets.

The system of the present invention provides energy saving control for a water heater via an intelligent thermostat. This intelligent thermostat provides programmatic control over the HVAC system as is conventional, and provides coordinated control over the water heater temperature set point. This control over the water heater is accomplished via a communications network between the intelligent thermostat and the water heater. In one embodiment the communications are wireless, although wired and network bus communications may also be utilized. Enhanced and coordinated control is also provided so that different operational temperature cycles can be provided to coordinate with the intelligent thermostat's programmatic control of the HVAC system. Separate programmatic control of the water heater is also provided whereby different operational temperature modes may be commanded, e.g. Wake, Sleep, and Demand modes of operation.

The inventive thermostat provides for sensing the temperature and humidity within the space, and responsively controlling the operation of an air conditioning compressor and blower to maintain the desired temperature and humidity. In a first mode, the thermostat operates the compressor at maximum capacity and the blower at less than maximum capacity to provide dehumidification when the humidity level is above a set point. In a second mode, the thermostat operates the compressor and blower at maximum capacity to provide full cooling capacity when the sensed temperature is more than a predetermined amount above the desired temperature setting. The thermostat is also configured to automatically switch from the first mode of operation to the second mode of operation.

Apparatus and methods are disclosed for controlling a cooling ventilation fan after the thermostat call for cooling has ended by providing a variable fan-off delay time based on cooling system parameters including but not limited to the cooling system operating time, duration of the thermostat call for cooling, relative humidity, temperature split, thermostat temperature rate of change, or thermostat temperature reaching a minimum inflection point or crossing a fixed or variable thermostat differential or differential offset. Apparatus and methods are disclosed for controlling a heating ventilation fan after the thermostat call for heating has ended by providing a variable fan-off delay time based on heating system parameters including but not limited to the heating system operating time, duration of the thermostat call for heating, temperature rise, thermostat temperature rate of change, or thermostat temperature reaching a maximum inflection point or crossing a fixed or variable thermostat differential or differential offset.

An electric water heater that includes a thermostat is retrofitted for remote control as follows. A relay is installed on an electrical feed to the electric water heater. Water temperature and electric current or power through the electrical feed are measured over time with the relay closed, and the thermostat deadband maximum and minimum are detected as the water temperature at which the thermostat turns the heating element off, and the water temperature at which the thermostat turns the heating element on, respectively. The detected thermostat deadband maximum and minimum are stored as load controller deadband maximum and minimum, respectively. The thermostat set point is raised, and the electric water heater is thereafter controlled using the load controller by operations including closing the relay when the water temperature falls below the load controller deadband minimum and opening the relay when the water temperature rises above the load controller deadband maximum.

A multistage furnace for heating residential or commercial spaces is operated by a single stage thermostat and a return air temperature sensor providing sensed temperature information to a controller. The furnace is started at a first, low firing rate and after a predetermined time is increased to a second firing rate if the rate of change of temperature of air returning to the furnace from the space is less than a predetermined amount. The method of operation is carried further to increase the firing rate to second and third rates based on predetermined rates of temperature change of return air from the enclosed space as sensed by the return air sensor.

A retrofit heat transfer unit, including: a housing for the retrofit unit, including inlet and outlet ports for water and refrigerant; a water pump, in fluid communication with the water inlet port, the water pump adapted to pump water from a water source; a heat exchanger, in fluid communication with the water pump, the water outlet port, the refrigerant inlet port and the refrigerant outlet port; and a thermostat, configured to measure a temperature of the pumped water and activate the water pump when the water is below a predefined low temperature and cease to pump when water is above a predefined high temperature. The retrofit unit is also adapted to receive heated refrigerant fluid from an air conditioner and direct the refrigerant through the heat exchanger and direct the pumped water into the heat exchanger so that the refrigerant heats the water and the water cools the refrigerant.

A thermostat (10) includes a housing (11) having a control panel (13) with a plurality of manually selectable input elements or input keys (15) and a display panel (17) for displaying various functions of the programmable thermostat. The programmable thermostat also includes a temperature sensor (18), a microprocessor (19) having memory for storing a default program set of default temperature and time values and a desired program set of desired temperature and time values. The microprocessor may compare the desired program set to the default program set in order to calculate the efficiency of a HVAC system. The calculated efficiency is then displayed graphically on the display panel.

A system and method of using a set-back or programmable thermostat for heating or cooling systems to also controlling a fast-recovery water heater such as a power-vented fossil fuel powered water heater such that the water heater is disabled during a set-back mode of the thermostat. The system sends a control signal to a relay module adjacent to the water heater, into which the water heater electrical power cord can be plugged into. The interlock mechanism of the water heater prevents operation of the water heater when power to the water heater is interrupted.

An energy-saving, four-season, smart, and safe cold/hot air blower of the present invention relates to a technique, which enables cold-air humidification by removing moisture when being used in the summer, can supply instantaneous hot air when the room temperature temporarily goes down, enables hot-air humidification by supplying moisture when being used in the winter, and further enables a four-season use by using an additional humidification function in the spring and fall seasons and enables the control of room temperature and room humidity by providing an indoor temperature/humidity sensor and a water temperature sensor, saves energy by intelligently operating and stopping all the functions thereof and operating a function for continuously connecting the operations, can improve the convenience of use by providing warning signs through lamps for indicating supply or discharge or lack of water according to the attachment of a high/low water level gauge of a water tank and a high water level gauge of a water tank for dehumidification, prevents safety accidents such as damage or conflagration and the like of components related to a fan driving motor by providing a fan driving motor overheating prevention sensor as a thermostat sensor at one side of the inner surface of the fan driving motor, and particularly, fundamentally prevents the leakage of water to the outside when a main body is falls down due to the negligence of a user.

Water dispenser with separation between hot and cold water to prevent, temporarily, like on the Sabbath, heating incoming cold water with the hot water in the tank. Ability to temporarily prevent functioning of electronic taps and during such time manual taps would be operable. Ability to temporarily prevent the functioning of the thermostat that controls the water heating elements and during such time to enable the water heating elements to operate at a fixed pre-set temperature.

Safety device to prevent the heating elements overheating when water level low.

Optional micro-processor to control the apparatus according to the day of the week.

The invention provides a vacuum low-temperature thermostat, which comprises a vacuum chamber for maintaining a vacuum state, a first cavity (4) and a second cavity (5), wherein the first cavity (4) is suspended in the vacuum chamber, and is used for containing a first refrigerant; at least two first conduits (2) for introducing and/or discharging fluid are connected to the first cavity (4); a cooling area is below the first cavity (4); the second cavity (5) is suspended in a way of surrounding the first cavity (4) in the vacuum chamber, and is used for containing a second refrigerant; the boiling point of the second refrigerant under standard atmospheric pressure is higher than that of the first refrigerant; at least two second conduits (3) for introducing and/or discharging the fluid are connected to the second cavity (5); the second cavity (5) can be used for externally cooling the first cavity (4), and is spaced from the first cavity (4) through vacuum. The vacuum low-temperature thermostat has the characteristics of low consumption of refrigerants with low boiling points and slight vibration.

A temperature controlled/limiting heating element for an electrically powered cooking appliance, having: a plate with an upper contact heating surface; a pair of heating element terminals adapted for removably engaging electrical power supply terminals of the electrically powered cooking appliance; a plurality of resistive heating wires, in thermal engagement with a lower surface of the top plate, comprising: a non-cycling resistive heating wire connected in series to the heating element terminals; and a cycling resistive heating wire connected in series to the heating element terminals via a thermostat switch in thermal engagement with a lower surface of the top plate, wherein the thermostat switch is normally closed when exposed to a sensed temperature below a set temperature and the thermostat switch opens when the sensed temperature is equal to or exceeds the set temperature.