INTRODUCE 

SR81 Controller Is The Updated Version Of The SR868C8 Controller .

1. SR81 - 1.5KW version

2. SR81 - 3KW version

3. SR81 - 4KW version

For below solar hot water system  :

Split type high pressure system 

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

APPLICATIONS CAPACITY

1. Max.number of collectors:1

2. Max.number of storage tanks:1

3. Max.number of relays:4

4. Max.number of sensors:5

5. Max.number of visualization application system: 1

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

TECHNICAL DATA

1. Size of Display panel (1.5/3/4KW version):120mm x 120mm x 18mm

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

3. Size of Controller board (3KW/4KWversion): 218mm x165mm x55mm

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

5. Power consumption: < 2.5W

6. Rated impulse voltage: 2.5KV

7. Housing: Plastic ABS

8. Protection type: IP40

9. Mounting: Wall mounting

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

11. Accuracy of temperature measuring: ± 0.1oC

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

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

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

15. Suitable power of HK (backup heating):

    1pc(1.5KW version) ˂1.5KW 

    1pc(3KW version) ˂3KW

    1pc(4KW version) ˂4KW

16. Inputs: 5 sensors,

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

    2pcs*NTC10K, B3950 sensor (≤ 135oC) for tank, (PVC cable ≤105oC),

    1pcs*NTC10K, B3950 sensor (≤ 135oC) for DHW pipeline , (PVC cable ≤105oC),-  Optional 

    1pcs*NTC10K, B3950 sensor (≤ 135oC) for thermostat function , (PVC cable ≤105oC), - Optional 

    #1*FRT Rotary vane type electron flow meter

17. Outputs: 4 relays, 

    R1,R2,R3 relay, for control pump or valve , Max.current 2A

    HR relay(1.5KW version)for on/off control of back-up heating , Max. Current 10A ( @AC230V, for 1500W electrical heater,@110VAC, for 750W electrical heater)

    HR relay(/3KW version)for on/off control of back-uheating , Max. Current 15A  ( @AC230V, for 3000W electrical heater,@110VAC, for 1500W electrical heater)

    HR relay(4KW version)for on/off control of back-up heating , Max. Current 20A ( @AC230V, for 4000W electrical heater,@110VAC, for 2000W electrical heater)

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

19. Water proof grade: IP41

Display Panel 

Terminal allocation of controller for electrical heater of 1500W

Terminal allocation of controller for electrical heater of 3000W/4000W

Delivery list

1. 1 * SR81 controller

2. 1 * accessory bag

3. 1 * user manual

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

5. 2 * NTC10K temperature sensor (φ6*50mm,cable length 3meter)

6. 1 *10A power cable ( Note: controller for 3000W/4000W electrical heater has no power cable delivered, user should prepare a cable of 2.5mm2)

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. OTDI---Thermal disinfection function

12. FS---Flow meter type selection.

13. UNIT---C-F unit switch

14. RST---factory setting

15. PASS--- password set

16. Holiday function

17. Screen Protection

18. Trouble Protection

19. Trouble Checking