Gree GRS-S16/Na-M, Service Manual

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HEAT PUMP WATER HEATER (NORTHERN EUROPE) INSTALLATION
10
2 MAIN LOGIC
2.1 Heating Mode
When press ON button, if the temperature of water tank meets the heating running requirements,
it starts the fans of outdoor unit. Then the compressor will run after 15s.
If the temperature of water tank is over the set temperature , the unit will stop, and turn off all
loads .The fans of outdoor unit will stop after 15s.
Turn on
Fan
1
Compressor
Turn off
Four-way Valve
15S
Fan
2
When it is turned off
15S 5S
30S
When it is turned off
2.2 Defrosting Mode
The condition of start defrosting mode:
Under heating mode, if the accumulative running time of compressor is over the set interval time
of defrosting
（
default 45min
），
and the defrosting temperature is lower than the set starting
temperature(default -4
℃
) ,the unit will start running defrosting mode, and the 4-way valve will shut