Gree VERSATI SERIES - 1 OPERATION FLOWCHART; 2 MAIN LOGIC

13
Air to Water Heat Pump
Service Manual- Versati Series
DPOUSPM
UNITS CONTROL
1 OPERATION FLOWCHART
Power Switch ON
Operation Mode
Judgment
Cooling Heating
YES
Cooling
Operation
Heating
Operation
Water
Heating
Water Pump
Control
Electric Expansion
Valve Control
Error Indication
Outdoor fan Motor
Control
Compressor
Control
Error Indication
Water Flow
Switch Control
YES
NO
Error Indication
NO
Error Indication
NO
YES
YES
YES
Water Pump
Control
Electric Expansion
Valve Control
Error Indication
Outdoor fan Motor
Control
Compressor
Control
Error Indication
Water Flow
Switch Control
YES
NO
NO
Error Indication
YES
YES
YES
Error Indication
4-Way Valve
Control
Error Indication
3-Way Valve and
2-Way Valve
Control
Water Heating
Operation
Water Pump
Control
Electric Expansion
Valve Control
Error Indication
Outdoor fan Motor
Control
Compressor
Control
Error Indication
Water Flow
Switch Control
YES
NO
NO
Error Indication
YES
YES
YES
Error Indication
4-Way Valve
Control
Error Indication
NO
YES
YES
YES
NO
NO
3-Way Valve and
2-Way Valve
Control
3-Way Valve and
2-Way Valve
Control
YES
NO
YES
NO
2 MAIN LOGIC
2.1 Defrosting Mode
2.1.1 The condition of start defrosting mode:
Under heating mode or water heating mode, if the accumulative running time of compressor is over the
set interval time of defrosting(default 50min),and the defrosting temperature(outdoor unit heat exchanger
temperature) is lower than the set starting temperature(default -4
),the unit will start running defrosting, and the
4-way valve will shut off and the outdoor fan will stop.
2.1.2 The condition of quit defrosting mode:
Under defrosting mode, if the continual defrosting time is over the set continual time of defrosting(default
10min) ,or the defrosting temperature is over the set stopping temperature(default 15
) ,the unit will restart