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Inverter Air-to-Water Heat Pump
Parameter D (Defrost Parameter)
1. Requirements to enter defrosting
① Check the suction pressure for 1 min. after the compressor starts, and when suction pressure is ≤D05, defrosting timing shall
be started.
② If the suction pressure sensor failure, the unit will start timing defrost, and the defrost cycle is D03, defrost time is D04.
2. Requirements to stop defrosting
① After starting defrosting, when T09≥D02,and T06≥D01, the unit stops defrosting;
② If the defrosting time reaches the maximum D04, the heat pump stops defrosting. D01——Exit Defrosting Setpoint.
3. Defrosting action
① The following operations shall be conducted if it complies with enter defrosting requirements:
a. The compressor start to down the frequency at the target frequency of 30Hz.(timings start).
b. When the cumulative time is 55S, the fan stops working and the four-way valve turns its direction.
c. Continue to accumulate 5s, and then start to up the frequency, and the target frequency is the max.value of D11.
② The following operations shall be conducted if it complies with stop defrosting requirements:
a. The compressor start to down the frequency at the target frequency of 30Hz (timings start).
b. The fan stops working, when the cumulative time is 55S, the four-way valve turns its direction.
c. Continue to accumulate 5s, and then start to up the frequency;
d. Raise the frequency to the start frequency setting and maintain it for 3 minutes before automatically determining the inlet
temperature.
Abnormal end of defrosting
① If the system turns off at the period of defrosting, it will keep on defrosting until defrosting ends.
② When detecting the HP switch is disconnected in the course of defrosting, the heat pump will stop defrosting.
③ When detecting the water ow switch is disconnected in the course of defrosting, the heat pump will stop for protection.
④ When detecting the LP switch is disconnected in the course of defrosting, the heat pump shield this fault and keep defrosting.
⑤ When detecting the exhaust temperature is overheated in the course of defrosting, the heat pump will stop for protection.
⑥ When detecting anti-freezing protection in the course of defrosting, the heat pump will stop for protection.
D02——Exit Defrosting Pressure
D03——Defrosting Cycle
D04——Max Defrosting Time
D05——Sliding High Point Under LP
D06——Sliding Low Point Under LP
D07——Sliding High Point of AT
D08——Sliding Low Point of AT
D09——Sliding Defrosting [0-No, 1-Yes]
When D09=1 the defrosting mode is a economic defrosting mode is sliding defrosting.
D10——Electric Heater [0-No, 1-Yes]
If D10=0, the electric heating will maintain the original working state when defrosting.
If D10=1, the electric heating will turn on when start defrosting, and maintain the original working state when end defrosting.
D11——Defrosting Frequency
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