Heating Mode; Indoor Fan Action; Auto Fan Of Indoor Fan Under Heating Mode; Four-Way Valve - York YKHC 18 Service Manual

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)
Room temp. up
Room temp. down

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 .
Indoor exchanger temp. up
Indoor exchanger temp. down
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.

Room temp. up
Room temp. down
Condition Compressor
Ta> Ts+4
Ta<Ts+4
Ta< Ts+3
Ta>Ts+3
Condition
T= Indoor exchanger temp.
T<25°C
25°C <T<32°C
T>32°C
T> 30°C
15°C <T<30°C
T<15°C
Condition (T =Indoor Temp.-Setting Temp.)
T<3°C
T>3°C
T> 1°C
T<1°C
15
Outdoor fan
Off Off
On On
On On
Off Off
Indoor fan speed
Off
Breeze
Setting fan speed
Setting fan speed
Breeze
Off
Indoor fan speed
High
Low
Low
High