General Introduction - Gree A Series Service Manual

4.3.9.2 Irrecoverable Protection
(1)Protection against High Pressure for the Compressor 1/2
When it is detected that the high pressure cutoff of the compressor 1/2 is tripped off, com-
pressor 1/2 will stop immediately. If both compressors are closed, their fans will be delayed
to stop. In this case, the control panel will display an alarm symbol, which should be
cleared manually for resuming normal operation.
(2)Protection for the Flow Switch
When it is detected for some unit that the flow switch is opened, this unit will stop. When
protection for the flow switch occurs for all unit, all compressors and water pumps will stop.
(3)Fault of Communication
When a single unit does not receive any signal from the controller, this unit will stop auto-
matically. For the unit with communication fault, when all its compressors stop and then
the water pump will follow.
(4)Protection against Phase Loss/Reversal
When there is phase loss or reversal for power supply, power for the main board will be cut
off directly. In this case, there is nothing for the main board.
(5)Protection for Abnormal 4–way Valve
When it is detected that the entering water temperature is 4℃ higher than the leaving
water temperature and the leaving water temperature continuously goes down, the control
panel will display this fault.
4.4

General Introduction

It uses the capacitor type touch screen for information input. The effective area for touching
indicates the rectangular black area when the backlight of the control panel lights off.
As the flexibility of the control panel is quite high, it would make an accidental response
when there is foreign matter on the surface of the control panel. Therefore, please keep the
both the touch screen and the finger clean during operation. Also, please keep the control
panel far away from the source of high-intensity electromagnetic interference.
A Series Modular-type Air-cooled (Heat Pump) Chiller
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