York YUHC 18 - Heating Mode Operations; Compressor and Fan Conditions; Indoor Fan Control in Heating

3.2 Heating Mode
3.2.1 Four-way valve opens at once, while defrosting process closes.
3.2.2 Condition for the compressor action: (Ts = set temperature, Ta = room temperature)
Condition Compressor Outdoor fan
Ta > Ts+4
Off Off
Room temp. up
Ta <Ts+4
On On
Ta < Ts+3
On On
Room temp. down
Ta >Ts+3
Off Off
3.2.3 Indoor Fan Action
3.2.3.1 Anytime remote switchover for fan speed among high/low/auto(anti-cold air function takes priority).
3.2.3.2 Anti-cold air:
Switchover between fan speed and fine tune can be set according to temperature of evaporator pipe.
Condition
T= Indoor exchanger temp.
Indoor fan speed
T<25°C Off
25°C <T<32°C Breeze
Indoor exchanger temp. up
T>32°C Setting fan speed
T> 30°C Setting fan speed
15°C <T<30°C Breeze
Indoor exchanger temp. down
T<15°C Off
During anti-cold air period, if indoor fan is shut down, then pre-heating/defrosting lamp is on. Once indoor
fan starts, pre-heating/defrosting lamp will be off.
3.2.3.3 Auto fan of indoor fan under heating mode.
Condition (T =Indoor Temp.-Setting Temp.) Indoor fan speed
T<3°C High Room temp. up
T>3°C Low
T> 1°C Low Room temp. down
T<1°C High