CD 30 ÷ 520
53
System B low-pressure protection (protection code P3)
Constant compressor: discharge Temperature switch is connected in series with
high-pressure switch.
Digital compressor: double protection of discharge Temperature Switch and discharge
Temperature Sensor, discharge Temperature Switch is connected in series with
high-pressure switch, and the discharge Temperature Sensor has its own interface.
Digital compressor has discharge Temperature sensor (which is invalid for the constant),
protection is depending on the discharge Temperature (DLT), and it will act for three
Temperature areas if the sensor is ok (failure code E8 means sensor absent): safe area
without protection when DLT below 125ć; yellow area appears in the condition that the
capacity dropping down to 40% of the rating, when DLT is higher than 125ć for 10 minutes.
If DLT is lower than 125ć, protection will eliminate, on the other hand, if DLT keeps
increasing to 140ć or more, it enter red area when the compressor stop and restart 3
minutes later if the problem has been solved.
13——TBH1,TBH2 Temperature sensor on the face 1 and 2 of the plate heat exchanger
14——Water flow Query (failure code E0 for main unit, E9 for auxiliary unit) which is just valid for
main unit.
Main unit: main unit controller will display E0 when water flow is abnormal 3 times
continuously. It will be recovered by re-electrifying meanwhile main board displaying E0
(after 3 times’ Querying).
Auxiliary: (preserved, be wired to short circuit when producing).
15——System B electric expansion valve.
16——System A electric expansion valve.
EXV can adjust the refrigerant flow according to different running models and capacity
requested by surrounding.
17——HEAT auxiliary heater.
z Notice: the actual figure of controller of the heater is not the 220V power supply
but the ON/OFF switch!
On heating mode, when the total outlet water is below 45ć, the switch closes; on the other
hand, when the Temperature is above 50ć, the switch opens to stop heating.
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