12
Air to Water Heat Pump
Service Manual- Versati II Series
CONTROL
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
running heating mode, and the 4-way valve will turn on and the outdoor fan will run.
2�2 Water-side Auto Anti-freezing in Winter
In low temperature, When the compressor stops (including normal or abnormal stop of the unit), if auxiliary
electric heater water-out temperature is lower than 5 , 30s later the water pump will automatically operate and
120s later the compressor operates.
When outlet water temperature is less than 20 ,the unit will operate while it will stop when the outlet water
temperature is more than 20 .
However, if there is malfunction of the unit, anti-freezing operation will be started by indoor electric heater
(two sets).
2�3 Control of Heating Tape on Chassis
When heating operation starts in low temperature, in order to prevent the condensation water generated
by defrosting from freezing in chassis, which will incur malfunction of drainage, the heating tape is installed
in chassis. If the ambient temperature is lower than 0 , when the compressor operates, electric heating will
operate; if the ambient temperature is higher than 2 or compressor stops, the electric heating will stop.
2�4 Control of Fan
In cooling, the outdoor fan will adjust fan speed according to pressure detected by high pressure sensor.
In heating or water heating, the fan will adjust fan speed according to ambient temp.
2�5 Control of Compressor
Output capacity of compressor is adjusted according to the comparison of current outlet water temperature
and setting outlet water temperature or the comparison of indoor ambient temperature and setting indoor
temperature;
The output capacity will not be adjusted within 6 min after the compressor operates; once compressor
stops, it can’t be started within at least 3 min.
2�6 Control of Electric Expansion Valve
In heating or water heating operation, electric expansion valve is adjusted according to superheat degree of
outdoor heat exchanger.
In cooling operation, electric expansion valve is adjusted according to superheat degree of plate-type heat
exchanger.
Electric expansion valve will not be adjusted within 3 min after the unit operates.
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