Control panel for an HVACR unit and HVACR unit

Abstract

A layered control panel for heating, ventilation, air conditioning, and refrigeration (HVACR) systems includes an outer layer for housing low-voltage components and an inner layer for housing high-voltage components. The outer layer is capable of assuming a closed position that prevents access to the inner layer, and an open position that does not prevent access to the inner layer. The outer layer may include a lock to retain it in the closed position. The outer layer may be one, two, or more panels mounted on hinges to allow it to swing between the closed and open positions.

Description

Technical Field

[0001] This invention relates to control panels for heating, ventilation, air conditioning, and refrigeration (HVACR) units, and in particular, to control panels that isolate high and low voltage controls. Background Technology

[0002] Control panels for heating, ventilation, air conditioning, and refrigeration (HVACR) units typically include both low-voltage and high-voltage components. For servicing, high-voltage components are often very demanding, frequently requiring shutdown, technicians wearing protective equipment, and / or other critical safety procedures. Current control panels can provide high-voltage components within the panel area, which can be protected by their own compartment with an isolation door, but this is space-consuming, especially relative to the limited space available for control panels on some HVACR units. Summary of the Invention

[0003] This invention relates to control panels for heating, ventilation, air conditioning and refrigeration (HVACR) units, and in particular, to control panels that isolate high and low voltage control.

[0004] The layered control panel according to the embodiment effectively isolates low-voltage components from high-voltage components while saving space through layering. Low-voltage components can be positioned on the outer layer for easy access, while high-voltage components are positioned on the inner layer, typically covered by the outer layer, thus restricting access to them. This layered design allows for the use of the same surface area for each group of components, and the layering sequence facilitates maintenance of low-voltage components while limiting access to high-voltage components. Furthermore, this arrangement allows the HVACR unit to continue operating during maintenance of low-voltage components, aiding in the diagnosis of potential problems and simplifying the troubleshooting process.

[0005] In one embodiment, a control panel for a heating, ventilation, air conditioning, and refrigeration (HVACR) unit includes: a control panel housing having an open side; an inner layer disposed within the control panel housing; a plurality of high-voltage components disposed on the inner layer; an outer layer disposed near the open side of the control panel housing; and a plurality of low-voltage components disposed on the outer layer. The outer layer is configured to be movable between a closed position and an open position, in which the outer layer covers the plurality of high-voltage components relative to the open side of the control panel housing, and in the open position, the plurality of high-voltage components are accessible through the open side of the control panel housing. The high-voltage components are disposed only on the inner layer.

[0006] In one embodiment, the low-voltage component is a safety ultra-low voltage (SELV) component.

[0007] In one embodiment, the outer layer comprises a single piece. In one embodiment, the control panel further includes a hinge on a first side of the single piece of the outer layer, the hinge connecting the single piece of the outer layer to the control panel housing. In one embodiment, the control panel further includes a lock on a second side of the single piece of the outer layer, the second side being opposite to the first side.

[0008] In one embodiment, the outer layer includes a plurality of components. In one embodiment, each of the plurality of components includes a hinge that connects the plurality of components to the control panel housing. In one embodiment, at least two of the plurality of components are configured to be locked to a housing support when the outer layer is in a closed position. In one embodiment, some of a plurality of low-voltage components are arranged on each of the plurality of components. In one embodiment, the low-voltage components are provided on only one of the plurality of components.

[0009] In one embodiment, a heating, ventilation, air conditioning, and refrigeration (HVACR) unit includes a control panel disposed on the outer surface of the HVACR unit. The control panel includes: a control panel housing having an open side; an inner layer disposed within the control panel housing; a plurality of high-voltage components disposed on the inner layer; an outer layer disposed near the open side of the control panel housing; and a plurality of low-voltage components disposed on the outer layer. The outer layer is configured to move between a closed position and an open position, in which the outer layer covers the plurality of high-voltage components relative to the open side of the control panel housing, and in the open position, the plurality of high-voltage components are accessible through the open side of the control panel housing. The high-voltage components are disposed only on the inner layer.

[0010] In one embodiment, the low-voltage component is a safety ultra-low voltage (SELV) component.

[0011] In one embodiment, the outer layer comprises a single piece. In one embodiment, the control panel further includes a hinge on a first side of the single piece of the outer layer, the hinge connecting the single piece outer layer to the control panel housing. In one embodiment, the control panel further includes a lock on a second side of the single piece of the outer layer, the second side being opposite to the first side.

[0012] In one embodiment, the outer layer includes a plurality of components. In one embodiment, each of the plurality of components includes a hinge that connects the plurality of components to the control panel housing. In one embodiment, at least two of the plurality of components are configured to be locked to a housing support when the outer layer is in a closed position. In one embodiment, some of the plurality of low-voltage components are disposed on each of the plurality of components. In one embodiment, the low-voltage component is disposed on only one of the plurality of components. Attached Figure Description

[0013] Figure 1 A perspective view of a control panel according to an embodiment is shown, wherein the layer carrying low-voltage components is open.

[0014] Figure 2A This shows the situation when the outer layer carrying the low-voltage component is closed. Figure 1 The front view of the control panel shown.

[0015] Figure 2B This illustrates the situation when the outer layer carrying the low-voltage component is open. Figure 1 The front view of the control panel shown.

[0016] Figure 3 A heating, ventilation, air conditioning and refrigeration system including a control panel is shown according to an embodiment. Detailed Implementation

[0017] This invention relates to control panels for heating, ventilation, air conditioning and refrigeration (HVACR) units, and more particularly, to control panels that separate high and low voltage controls.

[0018] Figure 1 A perspective view of a control panel according to an embodiment is shown, wherein the layer carrying the low-voltage component is open. The control panel 100 includes: a control panel housing 102 having an open side 104; an outer layer 106 including a first outer layer portion 108 and a second outer layer portion 110; a first hinge 112; a second hinge 114; a low-voltage component 116; an inner layer 118; and a high-voltage component 120. When the inner layer 118 is in the closed position, a housing support 122 is disposed within the control panel housing 102 and between the inner layer 118 and the open side 104.

[0019] The control panel housing 102 is a housing configured to include one or more components, such as control devices including low-voltage components 116 and high-voltage components 120. The control panel housing 102 protects its contents from the external environment and / or from unauthorized access. The control panel housing 102 may include one or more walls defining a perimeter shape and providing an openable side 104. The control panel housing 102 may be mounted on an HVACR unit, for example, on a wall of the HVACR unit's cabinet, such as a side wall of the cabinet.

[0020] The open side 104 is defined by the control panel housing 102. The dimensions and positioning of the open side 104 of the control panel housing 102 may be designed to allow access to at least some of the contents of the control panel housing 102. The dimensions and positioning of the open side 104 may be designed to allow at least a portion of the contents of the control panel housing 102 to be accessed for maintenance; for example, the dimensions of the open side 104 may be designed to allow maintenance personnel's hands and tools to be inserted into the control panel housing 102.

[0021] The outer layer 106 includes one or more panels. The outer layer 106 is configured to move between a closed position and an open position. In one embodiment, the outer layer 106 is movable between the closed and open positions by moving each of the one or more panels forming the outer layer 106. Each of the one or more panels of the outer layer is rotatable about a hinge to move between the closed and open positions. When the outer layer 106 is in the closed position, it is located in the space between the open side 104 and the inner layer 118, making it accessible through the open side 104 while being positioned to block access to the inner layer 118. The outer layer 106 may have one or more low-voltage components 116 located on its surface. In one embodiment, the low-voltage components 116 are located only on the outer layer 106 and are not, for example, included on the inner layer 118. In one embodiment, the low-voltage components 116 are disposed on the outer layer 106 such that when the outer layer 106 is in the closed position, the low-voltage components 116 are accessible for operation or maintenance. In one embodiment, when the outer layer 106 is in the closed position, the outer layer 106 is a continuous layer comprising one portion or multiple portions connected to each other. In one embodiment, the outer layer 106 comprises one or more portions, wherein at least some portions of the outer layer 106 are connected to the housing support 122 when the outer layer 106 is in the closed position. Figure 1 In the embodiment shown, the outer layer 106 includes a first outer layer portion 108 and a second outer layer portion 110.

[0022] The first outer portion 108 is one of the panels forming a portion of the outer layer 106. The first outer portion 108 can be coupled to the control panel housing 102 via a first hinge 112. The first outer portion 108 can be any suitable material for the panel used to support the low-voltage components 116. The first outer portion 108 may include at least some of the low-voltage components 116 included in the control panel 100. In one embodiment, the first outer portion 108 includes one or more retaining members 124, allowing the first outer portion 108 to be secured to other portions, such as to the second outer portion 110 or the housing support 122. In one embodiment, when the first outer portion 108 is in the closed position of the outer layer 106, the first outer portion 108 may be secured to the housing support 122.

[0023] The second outer portion 110 is another panel forming part of the outer layer 106. The second outer portion 110 can be coupled to the control panel housing 102 via a second hinge 114. The second outer portion 110 can be any suitable material for the panel supporting the low-voltage components 116. The second outer portion 110 may include at least some of the low-voltage components 116 included in the control panel 100. In one embodiment, the second outer portion 110 includes one or more retaining members 124, allowing the second outer portion 110 to be secured to other portions, such as the first outer portion 108 or the housing support 122. In one embodiment, when the second outer portion 110 is in the closed position of the outer layer 106, the second outer portion 110 may be secured to the housing support 122.

[0024] Low-voltage component 116 is an electronic component, such as a control unit for an HVACR system. Low-voltage component 116 can be an electronic component that can be safely accessed, operated, or repaired without posing a risk to personnel. In one embodiment, low-voltage component 116 can be an electronic component that can be safely accessed, operated, or repaired without requiring personnel to wear personal protective equipment. Low-voltage component 116 can include, for example, any compartmentalized or safety extra-low-voltage (SELV) component suitable for an HVACR system including control panel 100. Low-voltage component 116 can be classified as an SELV component that can perform according to any appropriate standard (such as a defined installation standard) based on some state. An example of such standard is UL60335-1. In one embodiment, all low-voltage components 116 included in control panel 100 may be disposed only on outer layer 106 such that low-voltage component 116 can be operated or repaired when outer layer is in the closed position. Low-voltage component 116 may be disposed on any one or more portions of outer layer 106. In one embodiment, low-voltage component 116 is disposed on each portion constituting outer layer 106. Non-limiting examples of low-voltage components include programmable logic controllers, communication modules, controller-to-wire harness interface circuits, ultra-low voltage power distribution terminal blocks, etc.

[0025] The inner layer 118 is a panel or support configured to support the high-voltage component 120. In one embodiment, the inner layer 118 may be positioned within the control panel housing 102 such that, at least when the outer layer 106 is in the closed position, the inner layer 118 is further away from the open side 104 than the outer layer 106. When the housing support 122 is included in the control panel 100, the inner layer 118 may be positioned further away from the open side 104 than the outermost portion of the housing support 122. The inner layer 118 may be any suitable material for the panel supporting the high-voltage component 120. In one embodiment, all high-voltage components 120 included in the control panel 100 are located on the inner layer 118. In one embodiment, no low-voltage components 116 are located on the inner layer 118.

[0026] In one embodiment, the inner layer 118 may be an opposite side of some or all of the panels defining the outer layer 106 (e.g., the first outer layer portion 108 and the second outer layer portion 110). In this embodiment, the inner layer 118 is disposed within the control panel housing 102 when the first outer layer 106 is in the closed position.

[0027] A high-voltage component 120 is disposed on the inner layer 118. The high-voltage component is an electrical and electronic component, such as a control device for an HVACR system included in the control panel 100. The high-voltage component may pose a risk to personnel approaching, operating, or repairing it when energized during maintenance. In one embodiment, the high-voltage component 120 may be a component requiring lockout and / or tag-out procedures during maintenance. The high-voltage component 120 may be a component receiving power at voltages exceeding safety standards, for example, a component that does not meet SELV standards. As mentioned above, a component can be identified as an SELV component using appropriate standards (such as standard UL60335-1). The high-voltage component 120 may be a component requiring personal protective equipment when approaching, operating, or repairing it. The high-voltage component 120 may be positioned on the inner layer 118 such that it cannot be accessed through the open side 104 when the outer layer 106 is in the closed position. The high-voltage component 120 can be positioned on the inner layer 118, allowing access to the open side 104, for example, when the outer layer 106 is in the open position, and thus access, operation, and / or maintenance of the high-voltage component 120 when the outer layer 106 is not in the closed position. Non-limiting examples of high-voltage components include switch blocks, fuse blocks, contactors, circuit breakers, transformers, overload relays, etc.

[0028] Optionally, the housing support 122 is included within the control panel housing 102. The housing support 122 may be a structured component, such as a column, horizontal bar, partition, or other suitable component disposed within the control panel housing 102. The housing support 122 may be configured to approach a portion of the outer layer 106 when the outer layer 106 is in the closed position. The housing support 122 may help to prevent the outer layer 106 from approaching the high-voltage component 120 when the outer layer 106 is in the closed position.

[0029] The retaining member 124 may be disposed on the outer layer 106 and / or on the control panel housing 102 or optionally on the housing support 122. The retaining member 124 is configured to allow the outer layer 106 to be held in a closed position. The retaining member 124 may be any suitable structure for retaining the outer layer 106, such as a flange, slot, tab, latch, snap-fit ​​component, hook, or any corresponding component. In one embodiment, the retaining member 124 may be disposed, for example, on the first outer layer portion 108, the second outer layer portion 110, and the housing support 122. In this embodiment, the retaining member 124 may be positioned and / or configured such that the first outer layer portion 108 can be held to one position on the housing support 122, and the second outer layer portion 110 can be held to another position on the housing support 122. In another embodiment, the retaining member 124 may be configured to hold the first outer layer portion 108 to the second outer layer portion 110. In yet another embodiment, the retaining member 124 may be configured to secure a single piece of the outer layer 106 to the control panel housing 102. In this embodiment, the retaining member 124 may be configured to secure a single piece of the outer layer 106 to the control panel housing 102 at the end of the outer layer 106 opposite the position where the hinge connects the outer layer 106 to the control panel 102. In one embodiment, the retaining member may include a hand-rotatable or tool-rotatable screw and a threaded hole configured to receive the screw. In one embodiment, the opposing retaining member 124 contacted by the screw may be a stop formed in the surface of the control panel housing 102 or the outer layer portions 108, 110, depending on the position where the screw is used for retention.

[0030] Figure 2A This shows the situation when the outer layer carrying the low-voltage component is closed. Figure 1 The front view of the control panel 100 shown. From Figure 2A As can be seen in the view shown, each of the first outer portion 108 and the second outer portion 110 rotates about the first hinge 112 and the second hinge 114 such that they extend inward from the control panel housing 102 toward the housing support 122. Each of the first outer portion 108 and the second outer portion 110 is locked to the housing support 122 by their respective retaining members 124. Therefore, the low-voltage component 116 is accessible through the open side 104 of the control panel housing 102, while the outer layer 106 is located between the open side 104 of the control panel housing 102 and the inner layer 118. When the outer layer 106 is located... Figure 2A When the device is in the closed position as shown, the high-voltage component 120 is not accessible from the open side 104.

[0031] Figure 2A The closed position shown is the standard position of the outer layer 106 during normal operation and maintenance of the control panel 100. Because in Figure 2AThe shown closed position allows only access to low-voltage components 116, thus enabling servicing or operation of these components without shutting down the HVACR, including the control panel 100, or without requiring personnel to wear electrical personal protective equipment. The retaining member 124 holds the outer layer 106 in a position that prevents access to the high-voltage components 120. When the retaining member 124 is disengaged, the first portion 108 and the second portion 110 of the outer layer 106 can move independently to position the control panel 100 as... Figure 2B The opening position is shown.

[0032] Figure 2B This illustrates the situation when the outer layer 106 carrying the low-voltage component is open. Figure 1 The control panel 100 is shown as a front view. This can be achieved by releasing any retaining member 124 and moving the outer layer 106 (e.g., by rotating the first portion 108 about the first hinge 112 and the second portion 110 about the second hinge 114). Figure 2B The open position is shown. In the open position, the inner layer 118 and the high-voltage component 120 can be accessed via the open side 104 of the control panel housing 102. In one embodiment, the housing support 122 may still be located between a portion of the open side 104 and the inner layer 118. In one embodiment, the high-voltage component 120 may be disposed on the inner layer 118 such that access to the high-voltage component 120 is not obstructed by the housing support 122. In one embodiment, access to the high-voltage component 120 can be obtained after a sealing and / or tagging procedure for maintenance of the high-voltage component 120. Figure 2B The location to open.

[0033] Figure 3 A heating, ventilation, air conditioning, and cooling (HVACR) system including a control panel is illustrated according to an embodiment. The HVACR system 300 includes a cabinet 302 having sidewalls 304, and a control panel 306 disposed on the surface of one of the sidewalls 304. The cabinet 302 is a structure that includes at least some components of the HVACR system 300, such as an air handling blower, outdoor coil, compressor, or any other suitable HVACR system component as a non-limiting example. The sidewalls 304 define the exterior of the cabinet 302. The control panel 306 is disposed on one of the sidewalls 304. The control panel 306 includes one or more electronic components for controlling and / or operating the HVACR system 300. The control panel 306 may be as described above. Figure 1 or Figure 2A and Figure 2BThe control panel 306 is recessed into a sidewall 304 such that when the control panel 306 is in the closed position, the outer layer is recessed or flush with the sidewall 304. In one embodiment, the control panel 306 protrudes outward from the sidewall 304. The control panel 306 may also include one or more doors 308. The doors 308 may cover the open side of the control panel housing of the control panel 306. When closed, the doors 308 may prevent access to the outer layer including low-voltage components of the control panel 306, such as those described above. Figure 1 The outer layer 106 of the control panel 100 is shown. In one embodiment, a door 308 forms part of one of the side walls 304. In one embodiment, the door 308 may be flush with the side wall 304 on which the control panel 306 is mounted.

[0034] all aspects :

[0035] It is understood that any of aspects 1 to 10 can be combined with any of aspects 11 to 20.

[0036] Aspect 1. A control panel for a heating, ventilation, air conditioning and refrigeration (HVACR) unit, comprising:

[0037] A control panel housing with an openable side;

[0038] The inner layer disposed within the housing of the control panel;

[0039] Multiple high-voltage components are disposed on the inner layer;

[0040] The outer layer is located near the open side of the control panel housing;

[0041] Multiple low-voltage components are disposed on the outer layer;

[0042] in

[0043] The outer layer is configured to be movable between the following positions:

[0044] In the closed position, the outer layer covers multiple high-voltage components relative to the open side of the control panel housing; and

[0045] In the open position, the plurality of high-voltage components are accessible via the open side of the control panel housing, and

[0046] The high-voltage components are only located on the inner layer.

[0047] Aspect 2, the control panel according to aspect 1, wherein the low-voltage component is a safety ultra-low voltage (SELV) component.

[0048] Aspect 3: The control panel according to any one of Aspects 1-2, wherein the outer layer comprises a single component.

[0049] Aspect 4. The control panel according to aspect 3 further includes: a hinge on a first side of the outer layer of the single piece, the hinge connecting the outer layer of the single piece to the control panel housing.

[0050] Aspect 5, the control panel according to aspect 4, further includes: a lock on a second side of the outer layer of the single piece, the second side being opposite to the first side.

[0051] Aspect 6. The control panel according to any one of Aspects 1-2, wherein the outer layer comprises a plurality of components.

[0052] Aspect 7. The control panel according to aspect 6, wherein each of the plurality of components includes a hinge that connects the plurality of components to the control panel housing.

[0053] Aspect 8. The control panel according to any one of Aspects 6-7, wherein at least two of the plurality of components are configured to be locked to the housing support when the outer layer is in the closed position.

[0054] Aspect 9. The control panel according to any one of Aspects 6-8, wherein some of the plurality of low-voltage components are disposed on each of the plurality of components.

[0055] Aspect 10. The control panel according to any one of Aspects 6-8, wherein the low-voltage component is disposed on only one of the plurality of components.

[0056] Aspect 11. A heating, ventilation, air conditioning and cooling (HVACR) unit, comprising a control panel disposed on the outer surface of the HVACR unit, the control panel comprising:

[0057] A control panel housing with an openable side;

[0058] The inner layer disposed within the housing of the control panel;

[0059] Multiple high-voltage components are disposed on the inner layer;

[0060] The outer layer is located near the open side of the control panel housing;

[0061] Multiple low-voltage components are disposed on the outer layer;

[0062] in:

[0063] The outer layer is configured to be movable between the following positions:

[0064] In the closed position, the outer layer covers the plurality of high-voltage components relative to the open side of the control panel housing; and

[0065] In the open position, the plurality of high-voltage components are accessible via the open side of the control panel housing;

[0066] The high-voltage component is only located on the inner layer.

[0067] Aspect 12, the HVACR unit according to aspect 11, wherein the low-voltage component is a safety ultra-low voltage (SELV) component.

[0068] Aspect 13. The HVACR unit according to any one of Aspects 11-12, wherein the outer layer comprises a single piece.

[0069] Aspect 14. The HVACR unit according to aspect 13 further includes: a hinge on a first side of the outer single piece, the hinge connecting the outer single piece to the control panel housing.

[0070] Aspect 15. The HVACR unit according to aspect 14 further includes: a lock on a second side of the outer layer of the unit, the second side being opposite to the first side.

[0071] Aspect 16. The HVACR unit according to any one of Aspects 11-12, wherein the outer layer comprises a plurality of components.

[0072] Aspect 17. The HVACR unit according to aspect 16, wherein each of the plurality of components includes a hinge that connects the plurality of components to the control panel housing.

[0073] Aspect 18. The HVACR unit according to any one of Aspects 16-17, wherein at least two of the plurality of elements are configured to be locked to the housing support when the outer layer is in the closed position.

[0074] Aspect 19. The HVACR unit according to any one of Aspects 16-18, wherein some of the plurality of low-voltage components are disposed on each of the plurality of components.

[0075] Aspect 20. The HVACR unit according to any one of aspects 16-18, wherein the low-voltage component is disposed on only one of the plurality of components.

[0076] The examples disclosed in this invention should be considered illustrative rather than limiting in all respects. The scope of the invention is indicated by the appended claims rather than by the foregoing description; all modifications falling within the meaning and equivalence of the claims should be included within the scope of those claims.

Claims

1. A control panel for heating, ventilation, air conditioning and refrigeration units, comprising: A control panel housing with an openable side; The inner layer disposed within the housing of the control panel; Multiple high-voltage components are disposed on the inner layer; An outer layer disposed near the open side of the control panel housing; Multiple low-voltage components are disposed on the outer layer; in: The outer layer is configured to be movable between the following positions: In the closed position, the outer layer covers the plurality of high-voltage components relative to the open side of the control panel housing. Low-voltage components are disposed on the outer layer such that, when the outer layer is in the closed position, the low-voltage components are accessible for operation or maintenance. In the open position, the plurality of high-voltage components are accessible via the open side of the control panel housing; and The high-voltage components are disposed only on the inner layer, such that when the outer layer is in the closed position, all of the plurality of high-voltage components are inaccessible on the open side.

2. The control panel according to claim 1, characterized in that, The low-voltage component is a safe ultra-low voltage component.

3. The control panel according to claim 1 or 2, characterized in that, The outer layer comprises a single piece.

4. The control panel according to claim 3, characterized in that, Also includes: A hinge on the first side of the outer layer unit connects the outer layer unit to the control panel housing.

5. The control panel according to claim 4, characterized in that, Also includes: A lock on the second side of the outer layer of the single piece, the second side being opposite to the first side.

6. The control panel according to claim 1 or 2, characterized in that, The outer layer comprises multiple components.

7. The control panel according to claim 6, characterized in that, Each of the plurality of components includes a hinge that connects the plurality of components to the control panel housing.

8. The control panel according to claim 6, characterized in that, At least two of the plurality of components are configured to be locked to the housing support when the outer layer is in the closed position.

9. The control panel according to claim 6, characterized in that, Some of the plurality of low-voltage components are disposed on each of the plurality of components.

10. The control panel according to claim 6, characterized in that, The low-voltage component is provided on only one of the plurality of components.

11. A heating, ventilation, air conditioning and refrigeration unit, comprising a control panel disposed on the outer surface of the heating, ventilation, air conditioning and refrigeration unit, the control panel comprising: A control panel housing with an openable side; The inner layer disposed within the housing of the control panel; Multiple high-voltage components are disposed on the inner layer; An outer layer disposed near the open side of the control panel housing; Multiple low-voltage components are disposed on the outer layer; in: The outer layer is configured to be movable between the following positions: In the closed position, the outer layer covers the plurality of high-voltage components relative to the open side of the control panel housing. Low-voltage components are disposed on the outer layer such that, when the outer layer is in the closed position, the low-voltage components are accessible for operation or maintenance. In the open position, the plurality of high-voltage components are accessible via the open side of the control panel housing; and The high-voltage components are disposed only on the inner layer, such that when the outer layer is in the closed position, all of the plurality of high-voltage components are inaccessible on the open side.

12. The heating, ventilation, air conditioning, and refrigeration unit according to claim 11, characterized in that, The low-voltage component is a safe ultra-low voltage component.

13. The heating, ventilation, air conditioning, and refrigeration unit according to claim 11 or 12, characterized in that, The outer layer comprises a single piece.

14. The heating, ventilation, air conditioning, and refrigeration unit according to claim 13, characterized in that, Also includes: A hinge on the first side of the outer layer unit connects the outer layer unit to the control panel housing.

15. The heating, ventilation, air conditioning, and refrigeration unit according to claim 14, further comprising: A lock on the second side of the outer layer of the single piece, the second side being opposite to the first side.

16. The heating, ventilation, air conditioning, and refrigeration unit according to claim 11 or 12, characterized in that, The outer layer comprises multiple components.

17. The heating, ventilation, air conditioning, and refrigeration unit according to claim 16, characterized in that, Each of the plurality of components includes a hinge that connects the plurality of components to the control panel housing.

18. The heating, ventilation, air conditioning, and refrigeration unit according to claim 16, characterized in that, At least two of the plurality of components are configured to be locked to the housing support when the outer layer is in the closed position.

19. The heating, ventilation, air conditioning, and refrigeration unit according to claim 16, characterized in that, Some of the plurality of low-voltage components are disposed on each of the plurality of components.

20. The heating, ventilation, air conditioning, and refrigeration unit according to claim 16, characterized in that, The low-voltage component is provided on only one of the plurality of components.

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