Gree HOME GMV [72/367] Control function of the units

Gree HOME GMV [72/367] Control function of the units
Dc Inverter VRF plus Water Heater Solution Service Manual CONTROL
68
2 CONTROL FUNCTION OF THE UNITS
2.1 Control Function of the Outdoor Unit
1The Capacity of Compressor Output
The capacity of compressor is counted by the indoor load or hydro-box load, and the former relates to running
or stopping of indoor unit ,the setting temperature,the outdoor temperature and the indoor temperature. the
hydro-box load relates to running or stopping of hydro-box,the setting water temperature, actual temp, the outdoor
temperature and the indoor temperature.Then the capacity of compressor output will match the indoor loads and
hydro-box optimally.
2Compressor Startup Control
Except the system receiving the stop signal,if the system starts,it must run for 6min at least.Once the
compressor stops,it restarts after 3min later at least.
The compressor has to be stopped for at least 3min once it stops. During this 3min, the compressor can’t
started up.
When the complete unit is under heating mode and the capacity requirement of each indoor unit is 0, the
compressor must be stopped.
Initialization Control of Compressor
3) Outdoor Fan Control
The closed-cycle control of direct current motor is adopted: it detects the actual rotational speed of
motor( feedback pulse of motor) and then compares it with the target rotational speed. Finally it output proper duty
ratio to change the rotational speed so that the decination can be cleared.
the frequency of fan adjusts from 0 to 55Hz. 0 means the stop of fan and 50 means fastest speed of fan.
Cooling Mode:
Initialization: Within 3min after the unit is started, set the initial fan frequency according to outdoor
temperature. This is applicable when the unit is initially started or the mode of the unit is shifted.
Output P25%
25%P
40%
40%P
60%
60%P
80%
P80%
Fan
Frequency
T0 0Hz 0Hz 1Hz 1Hz 1Hz
0T12 0Hz 1Hz 1Hz 1Hz 5Hz
12T20 10Hz 15Hz 20Hz 23Hz 25Hz
20T35 28Hz 33Hz 38Hz 44Hz Max.
35T40 36Hz 38Hz 41Hz 44Hz Max.
T40 Max. Max. Max. Max. Max.
RemarksMax. value is 50Hz
Fan Control after 3min
aFrequency of fan is adjusted in 3min later according to the change of pressure.
bThe max.frequency of fan is 50HZ and the min. is in the below table.(OHz means the stop of fan
regarding the drive of fan)

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