CONTROL SYSTEM
Service Manual – YBZE DCI 1-A.1 GB 12-5
12.3.2.2 Partial indoors to inactive
Recalculate the load immediately, for Inactive indoors, EEV opening is set to 0 step.
12.3.3 RV
RV is OFF in Cool Mode.
12.3.4 OFAN control during Cool Mode
OFAN will start 5sec before compressor start. After starting, it will run at High speed for 3 mins, and
then switch to the requested speed.
OFAN will run at one speed for at least 80sec, except the condition of the active indoor amount
changing.
After compressor stopping, the OFAN will keep the current speed for 1min and then stop.
12.3.5 Oil return operation during Cool Mode
12.3.5.1 Starting oil return
Oil return operation is to avoid compressor operating with low frequency for long time.
12.3.5.2 Oil return operation
Heating LED blinks (OFF-0.5sec, ON-10sec)
Compressor is forced to run higher frequency.
12.3.5.3 Exiting oil return
The oil return operating time reaches 5min (Including frequency’s changing time)
12.3.6 Indoor Fan operation under Cool Mode
In manual fan speed (Turbo/Hi/Med/low) setting, IFAN will operate at the setting speed.
In Auto Fan user setting, fan speed will be adjusted automatically according to the SPT and RAT,
refer to 12.1.3
12.4 Heat Mode
12.4.1 Condition of starting Heat Mode
If the system is in idle, when any one indoor request the heating mode operating, the system will
run in Heat Mode. EEV, OFAN and compressor will start operating.
12.4.2 Compressor’s action when Indoor changed to inactive (OFF or
Thermo OFF)
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