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Product Name
Split Pressure Series Controller
SR81Q(SR868C8Q) Solar Hot Water Controller
SR81Q(SR868C8Q) Solar Hot Water Controller
Product Model: SR81Q


SR81Q Controller Is The Updated Version Of The SR868C8Q Controller .

  1. SR81Q - 1.5KW version

For below solar hot water system  :

  1. Split type high pressure system 

  2. Split type Low / Non pressure system + Assistant tank with float ball


  1. Max.number of collectors:1

  2. Max.number of storage tanks:1

  3. Max.number of relays:4

  4. Max.number of sensors:6

  5. Max.number of visualization application system: 1

  6. FRT:1* Rotary vane type electron flow meter

  7. VFS:1*Grundfos flowmeter sensor

  8. Signal port for HE pump: IPWM1


  1. Size of Keypad:120mm x 120mm x 18mm

  2. Size of Controller(1.5KW version): 187mm x128mm x46mm

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

  4. Power consumption: < 2.5W

  5. Rated impulse voltage: 2.5KV

  6. Housing: Plastic ABS

  7. Protection type: IP41

  8. Mounting: Wall mounting

  9. Operation: 10 push buttons at the front cover.

  10. Accuracy of temperature measuring: ± 0.1oC

  11. Range of collector temperature measuring: -10oC ~220oC

  12. Range of tank temperature measuring: 0oC ~110oC

  13. Suitable power of pump: 3 pump possible to be connected  

  14. Suitable power of HK (backup heating):1pc*1.5KW

  15. Inputs: 6 sensors,

    1pcs*Pt1000 sensor (≤500oC) for collector (silicon cable≤280oC),

    5pcs*NTC10K, B3950 sensor (≤ 135oC) for tank, (PVC cable ≤105oC), ( T5,T6 optional )

    @1*FRT Rotary vane type electron flow meter

    @1*VFS: Grundfos flowmeter sensor

  16. Outputs: 4 relays,for circulation pump and backup heating

    1*Semiconductor relay, Max.current 1A

    2*Electronmagnetic relay, Max.current 2A

    1*Electronmagnetic relay, Max.current 2A

    @1*Potential-free extra-low voltage relay(on/off signal)

    @1*PWM variable frequency output(switchable 0-10v)

  17. Ambient temperature: -10oC ~ 50oC.

  18. Water proof grade: IP41

Delivery list

  1. 1 * SR81Q controller

  2. 1 * accessory bag

  3. 1 * user manual

  4. 1 * PT1000 temperature sensor (φ6*50mm,cable length 1.5meter)

  5. 4 * NTC10K temperature sensor (φ6*50mm,cable length 3meter)

  6. 1 *10A power cable

Display Panel 


Terminal connection


Input ports

  1. T1: PT1000 temperature sensor, for measuring the temperature of collector

  2. T2 ~T6: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and pipeline ( T6 optional )

  3. HK-A,HK-B: on/off signal, ( HK and HR triggered or stopped synchronously, for boiler heating controller)

  4. PWM: for high efficiency pump, connection see pump terminal connection diagram

  5. VFS: connect Grundfos flow sensor

  6. FRT: For rotary vane type electronic flowmeter


Output ports

  1. L, N: for power connection, L: live wire, N: zero wire, PE: protective wire, with 10A power plug.

  2. R1: semiconductor relay, Max. Current: 1A

  3. R2: Electromagnetic relay, Max. Current: 2A

  4. R3: Electromagnetic relay, Max. Current: 2A R3

  5. HR: Electromagnetic relay, designed for on/off control of back-up heating device, Max. Current: 10A ( @AC230V, for 1500W electrical heater, @110VAC, for 750W electrical heater)

R3 output connection with T- valve / pump


  1. R3 connect with T-valve: (COM common terminal, NO always open terminal, NC always close terminal)

  2. R3 connect with pump: (COM common terminal, NO always open terminal)

Connection with high efficiency pump


System description (Standard solar system with 1 tank, 1 collector field)


Sensor ports

  1. T1 Collector temperature sensor PT1000

  2. T2 Temperature sensor on the bottom part of tank NTC10K

  3. T3 Temperature sensor on the upper part of tank. NTC10K

  4. T4 Temperature sensor on DHW Pipe. NTC10K

  5. T5 Temperature sensor NTC10K ( function is not defined) 

  6. T6 Temperature sensor for flowpipe of DHW function NTC10K - optional

Relay outputs

  1. R1 For solar circuit pump

  2. R2  1. for DHW circuit function(CIRC)

           2.OHDP (Thermal energy transferring, R2,R3 can be selected)

  3. R3  1.TIME(Timer function)

           2.AH (Automatic thermostat function)

           3. OPAR ( Parallel relays function)

  4. HR For back-up heating

Main functions:

  1. DATE---Date setting

  2. Timed heat---backup heating

  3. Circle---Hot water circulation

  4. LOAD---Setup Loading tank1

  5. COL---Collector1

  6. PUMP---Pump control mode

  7. COOL---Cooling function

  8. AUX---Auxiliary function

  9. MAN---Manual mode

  10. BLPR---Blocking protection function

  11. OPARR---Parallel relay function

  12. OHQM---Thermal energy measurement

  13. FS--- Flow meter type selection.

  14. UNIT---C-F unit switch

  15. RST---factory setting

  16. PASS--- password set

  17. Holiday function

  18. Screen Protection

  19. Trouble Protection

  20. Trouble Checking



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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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