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K81B    Dual 485 communication with remote

Main technical parameters

1. Service conditions

◇ Operating voltage: AC220V/380V ± 10%, 50Hz ± 1Hz

◇ Operating ambient temperature: - 30~+65 ℃

◇ Storage temperature: - 40~+80 ℃

◇ Relative humidity: 0~95% RH

2. Temperature control accuracy:+- 1 ℃

3. The controller complies with GB4706.1-1998 Safety of Household and Similar Electrical Appliances - Part 1: General Requirements

GB4706.32-1996 Safety of Household and Similar Electrical Appliances - Particular Requirements for Heat Pumps, Air Conditioners and Dehumidifiers

GB18430. 2-2001 Steam Compression Circulating Cold Water (Heat Pump) Units Household and Similar Water (Heat Pump) Units

Immunity shall conform to GB4343.2-1999

Printed circuit board shall comply with GB4588.1 and GB4588.2

3、 Main functions of controller

1. Operation of hot water and cold water

2. It can display the water tank (water inlet) temperature and setting temperature, and query the coil temperature, ambient temperature, exhaust temperature, etc

3. Various parameters are automatically memorized after power failure, and the operation can be automatically restored after power on

4. The clock still runs after power failure, saving the trouble of readjustment every time power failure occurs

5. System parameter setting and correction

6. Electric auxiliary heating function (automatic and manual control)

7. Automatic defrosting function

8. Forced defrosting function

9. Operation panel LCD display, Chinese/English can be specified for ordering

10. Perfect protection functions: three-phase electric phase loss/reverse phase protection, high-voltage protection, low-voltage protection, water shortage protection, etc

11. Fault alarm, code display and query

12. When the query status reaches Er, press the "▲" or "▼" key to query the historical fault records in order,

It can store 7 historical faults that have occurred in the past, and still remember faults after power failure and reset.

13. Keyboard lock function

14. Automatic control of electronic expansion valve

15. Crankshaft heating control, chassis heating control, etc

16. Anti freezing function