York YHKJXH012BAM--FX Service Manual page 117

2. Sign definition:
Indoor
Tai Tc1
Outlet
Ambient
pipe
temp.
temp.
Tcomp1,2
Temp. compensation
3. Dry operation
Tai＜16℃, indoor unit stops running and sends stop-unit signal to outdoor.
Tai≤Tset, indoor motor runs at low speed and sends stop-unit signal to outdoor.
4. Fan operation
Indoor fan motor will run as the fan speed set on the remote controller or the wired controller and indoor
unit will send the stop-unit signal to outdoor.
5. Auto operation
5.1 If the unit enters Auto mode for the first time, the system will adjust the operation mode according to
the room temp. and the set temp.
When Tai≥Tset, entering auto cooling mode;
When Tai＜Tset, entering auto heating mode.
5.2 Auto cooling mode is as the same as the cooling mode. After the thermostat is OFF for 15 minutes, if
Tai+ 1+Tcomp2＜Tset, the unit will enter auto heating mode, or the unit will still stay at auto cooling mode
and stop when it reaches the set temperature; while the indoor motor will be at low speed.
5.3 Auto heating mode is as the same as the heating mode. After the thermostat is OFF for 15 minutes, if
Tai≥Tset+1 +Tcomp1, the unit will enter auto cooling mode, or the unit will still stay at auto heating mode;
5.4 In this mode, the Sleep function is available, run as cooling sleep in cooling mode and as heating
sleep in heating mode. Once sleep mode is set, the mode will not change after the unit stops for 15
minutes when it arrives Tset.
5.5 Mode conversion will be confirmed after compressor has stopped for 10 minutes.
6. Abnormal operation
6.1 When outdoor modes from the request of indoor unit conflict, the one entering firstly will take priority.
6.2 After indoor receives the ON command from wired controller, it will firstly confirm the outdoor current
operation mode. If they are the same modes, indoor unit will run as the request of remote controller. If
they are different modes, the system will forbid to operate, and indoor will keep the OFF mode and send
the "standby" signal to wired controller until outdoor stops or outdoor mode the requested mode of wired
controller are the same, the unit will run as the requested mode of wired controller.
6.3 After indoor receives the ON command from remote controller, it will firstly confirm the outdoor current
operation mode. If they are the same mode, indoor unit will run as the request of remote controller. If they
are different modes, the system will forbid to operate, and indoor will keep the OFF mode. After setting on
remote controller, if the buzzer sounds two times, that shows abnormal operation. Indoor will run until the
outdoor mode and the requested mode of remote controller are the same.
Tc2 Tm Tao
Inlet mid
Ambient
pipe coil
temp.
temp. temp.
Tset
Set
temp.
outdoor
Toci Tc
Thick pipe mid
of heat condenser
exchanger temp.
117
Te Ts
Compressor
Defrost
suction
temp.
temp.
Td
Compressor
discharging
temp.