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Product Name
Compact Non-Pressure Series Controller
SR501( SR500 ) Solar Hot Water Controller
SR501( SR500 ) Solar Hot Water Controller
Product Model: SR501


SR501 Controller Is The Update Version of the SR500 Controller .

For below solar hot water system  :

  1. Low / Non pressure solar water heater without assistant tank ( float ball )

  2. Pre-heated copper coil pressure solar water heater without assistant tank ( float ball )

SR501 has 2 version :

  1. SR501 - 1500W Version 

  2. SR501 - 3000W Version

SR501 micro-computer automatic controller for solar water heater, It is used to control integrated un-pressurized solar thermal system. 

It is developed using the latest NEC high-performance microcontroller to achieve intelligent control; 

All devices are industry standard and maintain good operation in cold, hot and humid environments.

At the same time, it uses a dedicated clock chip, accurate time control. The controller uses LCD liquid crystal display, 

The appearance of beautiful, stable and reliable performance, easy installation, making it the best matching products for solar water heater.


  1. Max.number of storage tanks : 1 

  2. Max.number of relays : 4

  3. Max.number of sensors : 3

  4. Max.number of application system : 1

Main technical data:

  1. Dimension:205mmX150mmX50mm

  2. Power supply:AC100-240V,50-60Hz

  3. Accuracy of temperature measuring:±0.1℃ 

  4. Range of tank temperature measuring:0~100℃ 

  5. Accurancy of temperature control:±2℃ 

  6. Suitable power of electrical heater: ≤ 1.5KW or ≤ 3KW ( Optional )

  7. Inputs: 3 * Sensors

    - B03 : Silicone sensor of water temperature and water level of the water tank

    - T1 : for NTC10K, B=3950, ≤135℃ sensor (PVC cable ≤105℃), designed for DHW circulation TCYC or AH function ( Optional )

    - T2 : for NTC10K, B=3950, ≤135℃ sensor (PVC cable ≤105℃), designed for pipe anti-freezing function ( Optional ) 

  8. Outputs: 4 * Electromagnetic relays

    - HR : designed for on/off control of back-up heating device, Max. Current: 10A(1500W version ) or 16A ( 3000W version ), @AC230V, for  ≤ 1500W  or  3000W electrical heater, @110VAC, for 750W or 1500W electrical heater

    - P1 : designed for the water filling pump, electromagnetic relay, max. power is 500W( 1500W version ) or  200W ( 3000W version )

    - R1 :  designed for the solenoid valve of water filling, output power is DC12V, wire connection is not positive and negative difference.

    - R2 : designed for the electric tracing belt, electromagnetic relay, maximum current is 2A. 

  9. SR501(1500W Version)has remote display function.  Remote display is optional accessory)

    SR501( 3000W Version ) has no remote display function.

  10. The electromagnetic valve:  DC12V/   AC220V,(Optional pressure valve and low pressure valve) 

    ※Pressure valve working pressure:  0.02Mpa~0.8Mpa  (For direct water supply)

    ※Low-Pressure valve working pressure:  0.0Mpa (Water supply by water tank or low water pressure)

  11. Ambient temperature : -10℃ ~ 50℃

  12. Water proof grade: IP40.

Delivery list

  1. Controller * 1piece

  2. User manual * 1piece

  3. Sensor of water temperature and water level ( with cable of 20m) * 1piece

  4. Solenoid valve * 1piece

  5. Accessories * 1bag

  6. 10A power cable ( for controller of 3000W Version plug not provided ) * 1piece





Main functions:


  2. Timing control water loading and backup heating at preset three time sections.

  3. Temperature controlled water loading.

  4. CTH Constant temperature heating.

  5. LWPR Low water pressure protection

  6. CWL Constant water level filling(preset 100% water level of tank)

  7. PUMP Water filling pump

  8. TCYC recirculation by temperature/flow within three time-sections.

  9. AH Automatic thermostat function

  10. OTF Three time –sections setting

  11. TKPR Tank high temperature protection function.

  12. CFR Tank anti-freezing protections.

  13. LWS Preset the water level of water filling when tank is lack of water

  14. LWSD Run-on time of water filing when tank is lack of water.

  15. OTDI Thermal disinfection.

  16. UNIT Celsius degree and Fahrenheit unit switch

  17. BEEP Beeper error warning

  18. Manual water filling.

  19. Compulsive water filing function.

  20. Manual heating.

  21. Manual DHW circulation

  22. Factory reset manually.

  23. Water level water temperature sensor sensitivity adjustment

  24. Pipe anti-freezing protection function.

  25. View the measuring valve.

  26. Overflow protection.

  27. High temperature protection of collector tube’

  28. Memory protection

  29. Screen protection.

  30. Trouble protection.

  31. Error code description.





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  • Tel: 0086-519-81580028
  • Fax: 0086-519-83251620
  • Add: No.5, Shengda Road, Konggang Industrial Park, Luoxi Town, Xinbei District, Changzhou City, Jiangsu Province China.
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