Gree GMV-PD160W/NAB-M

11
DC Inverter Multi
VRF Service Manual
DPOUSPM
2 MAIN LOGIC
2.1 Control Function of Outdoor Unit
1) Compressor Capacity Output
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The compressor capacity output is calculated according to the required indoor load, which is related to the
following factors: whether the indoor unit is started, the set temperature, the indoor ambient temperature, the
outdoor ambient temperature, etc.
Calculation of capacity output of cooling compressor
%100
)(
1
1
u
¦
¦
j
i
i
i
j
i
iON
q
Aq
Q
Calculation of capacity output of heating compressor
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)(
1
1
u
u
¦
¦
j
i
i
iiOFFi
j
i
iON
q
BqAq
Q
For inverter compressor
f
=
max
F
x
Q
,and when
f
is not 0, the minimum is
min
F
, the maximum is
max
F
Among which:
Q
is the calculated compressor capacity output;
f
Actual run frequency of inverter compressor;
max
F
Maximum allowable run frequency of inverter compressor;
min
F
Minimum allowable run frequency of inverter compressor
i
q
Rated capacity of indoor unit
iON
q
Rated capacity of indoor unit in ON state
i
A
Rated capacity of indoor unit in OFF state
i
A
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i
B
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2) Compressor Start Control
The shortest operating time of the compressor is 6 minutes. But when the switching-off signal or the
protection signal is received, the compressor must stop even if the operation of it has not lasted for 6 minutes.
The shortest stoppage period of the compressor is 3 minutes. The compressor must not be started at
any time within 3 minutes after the compressor is stopped.
If the capacity demand of each indoor unit is 0 when the whole unit group is under heating state, the
compressor must be stopped (if under the heating operation alone the temperature of stop control is reached,
the compressor must be stopped).
Initial Sequence Chart of Cooling/Dry Modes:
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5min and 5min when the frequency passed 60Hz, 75Hz and 90Hz. If high-pressure frequency-reducing and
exhausting frequency-reducing happens during the process, you should quit the initial action, and deal with
according to their separate frequency-reducing.