Gree GMV-PD100W/NAB-K Service Manual page 16

DC Inverter Multi
VRF Service Manual
Stop of frequency
initialization
Conversion controller
4-way valve
Fan
ODU EXV
IDU EXV
Initial Sequence Chart of Heating Mode:
target frequency. The dwell time is separately 5min and 5 min when the frequency passes 75 Hz and 90 Hz. 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.
Stop of frequency
initialization
Conversion controller
4-way valve
Fan
ODU EXV
IDU EXV
3) Outdoor fan control
speed: the upper and lower fans are both at medium speed; Medium fan speed: the upper and lower fan are
both at low speed; Low fan speed: the upper fan is at low speed, the lower fan stops; Stop fan speed: both the
upper and lower fans stop.
Cooling Mode:
The fan could be switched among ultra-high - high - medium - low fan speed.
The compressor should be forced to run at high fan speed for 35 seconds before started. After the
compressor started, you should not stop it within 3 minutes, but you could regulate it up to ultra-high fan speed.
The discharge pressure should be measured 3 minutes later, and you can regulate the fans' speed according to
the following discharge pressure:
12
60Hz/3min 75Hz/5min
If it is in heating position, cut off the power of 4-way valve for cooling.
480 Step
Initializat XX
0 Step
Step
180 s
60Hz/3min 75Hz/5min
120 s
When the high and low pressure is higher than or equal to 3kg/cm2G,
energize the 4-way valve
Initialization
300 step
Initialization
0 Step
250 step
180 s
90Hz/ 5min Target frequency
Adjust according to normal logic
90Hz/ 5min Target frequency
Adjust according to normal logic