Airwell YBZE218-324-430, Service Manual

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CONTROL SYSTEM
12-6 Service Manual
– YBZE DCI 1-A.1 GB
12.4.2.1 All indoors to inactive
Compressor stops immediately, OFAN stops after 1 min.
12.4.2.2 Partial indoors to inactive
Recalculate the load immediately, for Inactive indoors, EEV opening will follow 12.1.5.5.
12.4.3 OFAN control during Heat Mode
OFAN will start 5sec before compressor starts. After starting, it will run at High speed for 40 sec
then switch to the requested speed.
OFAN will run at one speed for at least 80sec.
After compressor stopping, the OFAN will keep the current speed for 1min and then stop.
12.4.4 Oil return operation during Heat Mode
12.4.4.1 Starting oil return
Oil return operation is to avoid compressor operating with low frequency for long time.
12.4.4.2 Oil return operation
Indoor display - Heating LED blinks (OFF-0.5sec, ON-10sec)
System will run at Cool Mode. Compressor is forced to run higher frequency. And both IFAN and
OFAN are stopped.
12.4.4.3 Exiting oil return
The oil return operating time reaches 5min (Including frequency’s changing time)
12.4.5 Indoor Fan Control in Heat Mode
Indoor fan speed depends on the indoor coil temperature
Anti-cold air function
When starting the heating mode, anti-cold air function will be activated and indoor fan can run at low
speed or stop running. This function will terminate after the unit runs for 3min or the ICT reaches 42
degree.
Residual heat blowing function
During heating, when the stopping condition for the compressor is reached, the compressor and the
outdoor fan motor stop running while the louver moves to position L. The indoor fan will stop after
running for 60s at setting speed.
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