GB/T 47622-2026General technical requirements for indoor thermostats (English PDF)

5.1 Basic Provisions

5.1.1 The temperature controller shall be manufactured in accordance with the drawings and technical documents approved according to the prescribed procedures.

5.1.2 The temperature controller should use either AC or DC power. The AC power supply should be compatible with 24V or 220V, 50Hz; the DC power supply should be compatible with... 12V, 24V, or 48V. Battery-powered thermostats should be compatible with 1.5V or 3V power.

Note. This requirement does not apply to products that are embedded in other devices and function as temperature controllers.

5.1.3 In general use, the protection rating of the thermostat should not be lower than IP20; for use in kitchens, bathrooms, and other places with high humidity. At this time, the protection level of the thermostat should not be lower than IP24, and waterproof covers and other protective measures can be used to achieve this level requirement.

5.1.4 The thermostat should be installed 1.2m to 1.5m above the ground for easy operation and to accurately reflect the temperature of the controlled area.

5.2 Materials

5.2.1 The heat resistance and flame retardancy of materials used in the thermostat's housing, display screen, circuit board assembly, wiring harness assembly, and fasteners shall meet the following requirements. According to the relevant provisions of GB/T 14536.1-2022, the content of hazardous substances shall comply with the relevant provisions of GB 26572.

5.2.2 The metal parts of the thermostat shall comply with the relevant provisions on corrosion resistance in GB/T 14536.1-2022.

5.2.3 The components and materials of the thermostat should preferably be manufactured using renewable resources.

5.3 Specifications and Structure

5.3.1 The structural design of the thermostat shall comply with the relevant provisions of GB/T 14536.1-2022.

5.3.2 The external dimensions of the panel, adjustment plate or mounting box for concealed mounting of the thermostat should be compatible with the installation requirements of the 86-type mounting box.

5.3.3 The terminals and connectors of the temperature controller shall meet the requirements of Chapter 11 of GB/T 14536.1-2022.

5.3.4 The components of the thermostat should be secure and not loose, and the operation of operable parts such as buttons should be sensitive and reliable.

5.4 Safety The safety of thermostats should comply with the relevant provisions of GB/T 14536.1-2022, including thermostats for electric underfloor heating and water-based radiant heating and cooling systems. Safety should also comply with the relevant provisions of GB/T 31459.

6.2.1 Display Function

6.2.1.1 The human-machine interface display function requirements for the temperature controller are as follows:

a) Graphic symbols should be clearly legible, without any defects, breaks, or deformation;

b) When operating the temperature controller, the set temperature, operating mode, and other parameters should be displayed. If a malfunction occurs, a fault symbol or similar prompt should be displayed.

c) Wireless networked thermostats should display network status;

d) Under normal use, the temperature display value should be an integer or retain one decimal place; during temperature measurement accuracy testing, the temperature display value should be... It should be rounded to one decimal place, and the unit is degrees Celsius (°C).

6.2.1.2 The graphic symbols for the main functions of the human-machine interface of the temperature controller should refer to Appendix A, and its display screen should be backlit.

6.2.2 Setting Function The thermostat should be able to turn on/off, set the temperature, and change the operating mode via a human-machine interface or communication function.

6.2.3 Control Functions

6.2.3.1 The temperature controller should be able to automatically control the operation of the terminal equipment according to the set temperature, operating mode and other parameters.

6.2.3.2 The programmable temperature controller should have editing functions for the timetable and set temperature. Upon initial power-on, it will default to the factory-set timetable. Dynamic operation. During the working period, the factory-set temperature should not be lower than 26°C in cooling mode and not higher than 18°C in heating mode; non-operating... During the operating period, the factory-set temperature should not be lower than 28°C in cooling mode and should not be higher than 16°C in heating mode.

6.2.3.3 In situations where there is a need for antifreeze protection during heating mode, the thermostat should have antifreeze protection function.

6.2.3.4 Temperature controllers with a power greater than 2W under rated operating conditions should have a screen-off mode.

6.2.4 Communication Function

6.2.4.1 The underlying protocol of the wired network thermostat should support one or more of the following. TCP/IP, RS-485, and RS-232; the wireless network thermostat... The controller's underlying protocol should support one or more of the following. ZigBee, LoRa, Wi-Fi, 4G, 5G, NB-IoT, and Bluetooth. (Networked thermostat) The layer communication protocol should support one or more of Modbus, BACnet, KNX, and MQTT.

6.2.4.2 The communication protocol of the networked thermostat should at least include on/off control, operating status, operating mode, set temperature, and indoor temperature. Degree and status of the controlled terminal equipment.

6.2.4.3 When the temperature controller uses Modbus-RTU or Modbus-TCP/IP protocol for communication, it is advisable to refer to Appendix B and send data according to the Modbus protocol. The register allocation example shows how registers are allocated. The encoding format of floating-point data should conform to the relevant requirements of ISO /IEC 60559.

6.2.5 Power-off data retention function The thermostat should support data retention during power outages. Within 72 hours of a power outage, the set temperature of all thermostat types except programmable thermostats should be retained. The operating mode and other configuration data should remain consistent with those before the power outage; the RTC clock of the programmable temperature controller should continue to run within 24 hours of a power outage. The set temperature, operating mode, timetable, and set temperature corresponding to the time period should be consistent with those before the power outage.

6.3.1 Temperature measurement accuracy

6.3.1.1 Within the temperature control range of the thermostat, its temperature measurement accuracy (DeltaTm) should be better than 1.0°C.

6.3.1.2 Under constant temperature and humidity conditions, the accuracy of temperature measurement should meet the design requirements.

6.3.2 Interaction Response Time The response time (Deltats) of the human-machine interface of the temperature controller should not exceed 1 second.

6.3.3 Adjustable temperature setting range The adjustable temperature setting range for electric underfloor heating thermostats should be 5°C~35°C, while for other types it should be 10°C~35°C.

6.3.4 Power Consumption The power consumption limits of the temperature controller under different operating conditions should meet the requirements of Table 1.

6.4 Mechanical Properties

6.4.1 Load force during button operation The load capacity of the mechanical buttons on the thermostat should be 0.8N~4N, and the dispersion of each button on the same thermostat should not exceed 1N.

6.4.2 Relay switching capacity The switching capacity of the thermostat relay should not be less than 100,000 cycles.

6.5 Environmental adaptability

6.5.1 High and Low Temperature Operation and Storage Conduct tests for high-temperature operation, low-temperature operation, high-temperature storage, low-temperature storage, and constant humidity and heat according to the methods specified in

7.7.1.1 to 7.7.1.5. The thermostat should be free from deformation, cracks, rust, or other defects. All functions and performance should be normal, and the components should be undamaged.

6.5.2 Fall The thermostat should function normally after being dropped from a height of 1 meter.

6.5.3 Scanning Vibration (Sine) The thermostat should function and perform normally under 150Hz vibration.

6.6 Electrical Safety The electrical safety of thermostats shall comply with the relevant provisions of GB/T 14536.1-2022 and GB/T 14536.10.

6.7 Electromagnetic Compatibility

6.7.1 Launch The electromagnetic emissions of the temperature controller should comply with CISPR 22B level in Chapter 24 of GB/T 14536.1-2022 or GB/T 9254.1. Regulation.

6.7.2 Immunity The electromagnetic immunity of the temperature controller shall comply with the provisions of Chapter 27 of GB/T 14536.1-2022.

7.1 Test Conditions

7.1.1 The test conditions for the temperature controller shall meet the requirements of Table 2.

7.1.2 The requirements for the temperature test chamber or temperature test room used for the temperature measurement accuracy test of the thermostat are as follows:

a) The adjustable temperature range of the temperature test chamber or temperature test room should be 10°C~35°C, and the temperature change rate during heating or cooling should be [not specified]. The temperature should be no less than 5°C/h.

b) The temperature test chamber or temperature test room should have an upward airflow pattern with downward return.

c) The temperature deviation between the temperature inside the temperature test chamber or temperature test room and the set temperature should not exceed 0.5°C, and the thermometer used for testing should be located at the... The installation distance between the temperature controller being tested and the thermometer being tested, directly in front of it at the same height, should be 100mm ± 10mm. When the temperature inside the temperature test chamber or temperature test room stabilizes at a certain set temperature, the temperature controller installation location should be horizontally and vertically aligned. The temperature difference within 100mm should not exceed 0.2°C.

d) The temperature controller under test should be placed in the center of the temperature test chamber or correctly installed in accordance with the requirements of 5.1.4. On the room wall, after the test begins, the wind speed around the thermostat should not exceed

0.5 m/s.

e) Test data should be obtainable accurately and completely.

7.1.3 The environmental adaptability test chamber for temperature controllers (hereinafter referred to as the "environmental test chamber") shall meet the following requirements.

a) The internal dimensions of the box shall not be less than 500mm × 500mm × 500mm (L × W × H);

b) The internal temperature is adjustable from -30°C to 80°C, and the relative humidity is adjustable from 20% to 95% (internal temperature not less than...). (at 20°C)

c) The heating or cooling rate inside the chamber shall not exceed 1°C/min;

d) Test parameters can be obtained accurately and completely.

7.2 Test Instruments The accuracy of the testing instruments should meet the requirements of Table 3.

7.4 Functions

7.4.1 Display Function Install the temperature controller correctly according to the product manual and connect the power supply. Manually set the human-machine interface buttons to the test interface and then visually inspect the settings. examine.

7.4.2 Setting Function Install the thermostat correctly according to the product manual and connect the power supply. Manually operate the human-machine interface buttons or use the method shown in Figure 1. The temperature controller is connected to the testing software tool and maintains normal communication. The parameters of the temperature controller are set through the testing software tool, and visual inspection is performed. Figure

7.4.3 Control Functions

7.4.3.1 Refer to the product manual to correctly connect the temperature controller and the analog load that matches the rated load, and turn on the power. Then, use the human-machine interface... The interface sets the thermostats on various control function pages. Based on the actual indoor temperature, the set temperature is manually adjusted upwards or downwards, and visual inspection is performed. The response of terminal equipment after being controlled by the temperature controller; manually changing the operating mode and visually inspecting the response of terminal equipment.

7.4.3.2 Through the human-machine interface of the thermostat, a certain period of time is manually set as the "working period," and the cooling operation during that period is verified. Check if the default temperature range meets the requirements; manually set a certain period as a "non-working period" and verify the cooling performance during that period. Check if the default temperature setting range meets the requirements. Repeat the above steps to verify if the default temperature setting range under heating conditions is met. Require.

7.4.3.3 Visually inspect whether the thermostat can be set to antifreeze protection function or screen-off mode.

7.4.4 Communication Function According to the thermostat communication protocol type in the product manual, the networked thermostat is connected to the human-machine interface device (which can be configured to operate normally) using the method shown in Figure 2. (Use a regular communication protocol testing tool) to correctly connect and power on the device, and visually inspect the contents of the communication protocol. Figure

7.5.1 Temperature measurement accuracy

7.5.1.1 The temperature controller and the simulated load matching the manufacturer's nominal load are correctly connected. When conducting the test in the temperature test chamber, use a material with a thickness of [thickness missing]. Wrap the back of the thermostat with 20mm thick insulation material with a thermal conductivity of 0.03W/(m·K)~0.04W/(m·K) and fix it to the temperature test. On the test rack inside the box; when conducting the test in the temperature test room, install the temperature controller correctly according to the requirements of 5.1.4.

7.5.1.2 Install the test thermometer and the temperature controller under test correctly according to the requirements of 7.1.2c). Check the temperature controller connection, connect the power supply, and ensure the temperature... The controller is working properly.

7.5.1.3 Adjust the temperature change in the temperature test chamber or temperature test room at a certain rate to reach 18.0°C, 22.0°C, and respectively. After maintaining a stable temperature of 26.0°C and 28.0°C (temperature change rate not exceeding 1°C/h, wind speed not exceeding 1m/s) for 1 hour, the temperature was increased to 1 time/min. The temperature of the thermometer is collected frequently and recorded as Ti, and the displayed temperature of the temperature controller (Tti) is also recorded. Each temperature value is sampled 5 times, according to formula (1). Calculate the temperature measurement accuracy (DeltaTml) of the thermostat under load conditions.

7.5.1.4 Repeat the test steps of

7.5.1.3 for the thermostat without load, and calculate the temperature of the thermostat under no load according to formula (1). Measurement accuracy (DeltaTmn).

7.5.2 Interaction Response Time Secure the temperature controller to a test bracket inside the temperature test chamber or room, and connect the power supply to the temperature controller. (Through the human-machine interface...) Set parameters such as temperature and operating mode, record the setting operation time and interface response time with video, and repeat the above operation twice. Calculate the interaction response time (Deltats) using formula (3).

7.5.3 Adjustable temperature setting range Install the thermostat correctly according to the product instructions. Manually operate the temperature setting button on the thermostat to adjust the set temperature value up or down. Visually inspect for any issues. The same type of thermostat adjusts the range of temperature changes.

7.5.4 Power Consumption Connect the power meter to the power input terminal of the temperature controller as shown in Figure

3.The temperature controller should be unloaded and powered on. Operate via the human-machine interface. Use the on/off switch to put the device into both on and off states, and record the power meter reading after it stabilizes.

7.6 Mechanical Properties

7.6.1 Load force during button operation Use a force gauge to measure the load force when the temperature controller is working.

7.6.2 Relay breaking capacity The test shall be conducted in accordance with the method specified in GB/T 21711.1.

7.7.1 High and Low Temperature Operation and Storage

7.7.1.1 High-temperature operation Under the test conditions specified in GB/T 2423.2, the temperature controller was placed in the environmental test chamber in its normal operating position, and the functional test was performed. Connect the instrument or air conditioning terminal equipment to the power supply, select the cooling mode in the control function, and run it at full load; adjust the temperature of the environmental test chamber to... The temperature is increased to (55±1)°C at an average rate not exceeding 1°C/min. After the temperature stabilizes, the temperature is maintained for 4 hours, and the operating status is checked.

7.7.1.2 Low-temperature operation Under the test conditions specified in GB/T 2423.1, repeat the test steps in

7.7.1.1 until the power is turned on, and select heating in the control function. Mode. Full-load operation; Adjust the temperature of the environmental test chamber to decrease to (-10±1)°C at an average rate not exceeding 1°C/min. After stabilization, continue for 4 hours and check the operating status.

7.7.1.3 High-temperature storage Under the test conditions specified in GB/T 2423.2, the temperature controller is de-energized and placed in its normal operating position inside the environmental test chamber. Adjustment ring. The temperature of the environmental test chamber was increased to (60±1)°C at an average rate not exceeding 1°C/min, and maintained for 24 hours after the temperature stabilized; then the temperature was adjusted. The temperature of the environmental testing chamber was reduced to the normal ambient temperature at an average rate not exceeding 1°C/min. The temperature controller was removed, and after 2 hours of recovery, all components were checked. This function.

7.7.1.4 Low-temperature storage Under the test conditions specified in GB/T 2423.1, the temperature controller is de-energized and placed in its normal operating position inside the environmental test chamber. Adjustment ring. The temperature of the environmental test chamber was reduced to (-25±1)°C at an average rate not exceeding 1°C/min, and maintained for 24 hours after the temperature stabilized; then the environmental test chamber temperature was further reduced. Once the temperature of the environmental test chamber rises to the normal ambient temperature, remove the temperature controller and allow it to recover for 2 hours before checking all functions.

7.7.1.5 Constant humidity and heat Under the test conditions specified in GB/T 2423.3, the temperature controller is de-energized and placed in its normal operating position inside the environmental test chamber. Adjustment ring. The temperature and humidity of the environmental testing chamber were adjusted at an average rate not exceeding 1°C/min, with the internal temperature set to (40±1)°C and the internal relative humidity set to [value missing]. (93±2)%, after the temperature and humidity stabilize, continue for 48 hours; remove the thermostat, restore for 12 hours, and then check all functions.

7.7.2 Fall Under the test conditions specified in GB/T 2423.7, the six sides of the packaged thermostat were dropped freely from a height of 1m onto a flat surface of water. Each drop should be made once on the mud floor, with the drop surface parallel to the impact surface.

7.7.3 Scanning Vibration (Sine) Under the test conditions specified in GB/T 2423.10, the thermostat, without its packaging and without power, should be tightened in its normal operating position. On the vibration test bench, the vibration frequency was varied from 10Hz to 150Hz and then back to 10Hz, with a scanning rate of 10m/s^2 across the three axes. Vibrate vertically upwards at a frequency of 10 cyclic scans per axis.

7.8 Electrical Safety The tests shall be conducted in accordance with the methods specified in GB/T 14536.1-2022 and GB/T 14536.10.

7.9 Electromagnetic Compatibility

7.9.1 Launch The test shall be conducted in accordance with the method specified in Chapter 24 of GB/T 14536.1-2022.

7.9.2 Immunity The test shall be conducted in accordance with the method specified in Chapter 27 of GB/T 14536.1-2022.

8.2 Factory Inspection

8.2.1 Each thermostat can only leave the factory after it has passed the quality inspection of the manufacturer and been issued a certificate of conformity.

8.2.2 Factory inspection shall be carried out item by item according to the items specified in Table 4.

8.4 Type Testing

8.4.1 Type testing shall be conducted under any of the following circumstances.

a) During the trial production and type approval of new products or products transferred to another factory for manufacturing;

b) After formal production begins, if significant modifications to the design, structure, materials, and processes may affect product performance;

c) When production resumes after a one-year suspension;

d) When the factory inspection results differ significantly from the previous type inspection results.

8.4.2 Type testing shall be carried out item by item according to the items specified in Table 4.

9.1 Marking

9.1.1 The temperature controller shall display the following information in a prominent location on the unit body.

a) Product model and name;

b) Main technical parameters (rated voltage, rated current, nominal load, terminal markings);

c) This document number;

d) Factory serial number;

e) Manufacturer's name;

f) RoHS marking;

g) Production date.

9.1.2 The markings on the thermostat should be clearly visible and durable.

9.1.3 The function of each button should be clearly marked on the temperature controller.

9.2 Packaging

9.2.1 The thermostat should be cleaned before packaging. All parts should be dry and clean, and easily rusted parts should be coated with rust inhibitor.

9.2.2 The temperature controller should be fixed inside the packaging box and have reliable moisture-proof, vibration-proof and anti-static measures.

9.2.3 The packaging box should include a product certificate of conformity and a product instruction manual, and the product instruction manual should comply with the relevant provisions of GB/T 5296.2. Regulation.

9.2.4 The packaging box shall clearly indicate the shipping and receiving marks and storage and transportation marks, and the marks shall comply with the relevant provisions of GB/T 6388 and GB/T 191. Regulation.

9.3 Transportation and Storage

9.3.1 Thermostats should be handled with care during transportation to prevent collisions and impacts, and to ensure they are not damaged by bumps, rain, snow, or chemical corrosion. It should not be stored with corrosive substances such as acids and alkalis.

9.3.2 The packaged thermostat should be stored in a clean, dry, well-ventilated warehouse free of corrosive gases.