York YWHJXH012BAMK-FX Service Manual Download Page 28

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2.3.2 Defrosting and Oil Return
When receiving the signal of defrosting and oil return, the horizontal louver(big one)  will rotate to the position where the angle is
minimum and the other horizontal louver(small one) will close. In 10 seconds later, indoor fan will stop operation. During defrosting, oil
return and 5 minutes after quit, all indoor pipe temperature sensors will not be detected. When receiving oil return signal or defrosting
signal sent by outdoor unit, “dual 8” nixie tube will display “H1”. (H1 is not malfunction code.)
2.3.3 Blow residual heat
In heating mode, when temperature reaches the set temperature, the compressor and outdoor fan will stop.
The horizontal louver (big one) will rotate to the default position for cooling and the other one (small one) will close. Indoor unit will
operate at set speed for 60s and then stop operation.
When the unit is in heating mode or auto heating mode, and also the compressor and indoor fan are operating, if turning off the unit,
compressor and outdoor fan will stop. Horizontal louver (big one) will rotate to the position where gentle wind is blown out (default
position for cooling) and the other horizontal louver (small one) will close. Indoor unit will operate at low speed for 10 seconds and then
the unit will be turned off.
2.4 Fan Mode
In this mode, indoor fan operates at set speed while compressor and outdoor fan stop operation. The set temperature range is
16~30

. Operation icon and set temperature are displayed.

2.5 Auto Mode
In this mode, operation mode (Cool, Heat, Fan) will be automatically selected according to change of ambient temperature. Operation
icon, actual operation icon and set temperature will be displayed. There is 30s delay for protection when changing mode. The
protection function is as the same as that under each mode.
2.5.1 When Tamb.≥26

the unit will operate at cooling mode, the default set temperature is 25

2.5.2 When Tamb. ≤21

the unit will operate at heating mode, the default set temperature is 20

if the cooling only unit operates at

fan mode, the default set temperature is 25

;

2.5.3 When 22

≤Tamb. ≤25

and the unit is turned on for the first time, if it changes to auto mode from other mode, the previous

operation mode will be maintained; If it changes to auto mode from dry mode, the unit will operate at fan mode.
2.5.4 When the unit operates at auto mode, the frequency of compressor is as the same as that under cooling mode, while it is as the
same as that under heating mode.
Protection function
A.  Under cooling mode, the protection function is as the same as that under cooling mode.
B.  Under heating mode, the protection function is as the same as that under heating mode.

2.6. “8

” Heating

Under heating mode, press buttons “Temp” and “Clock” simultaneously, the 8

heating function will be activated and “cold air

prevention” will be shielded.
2.6.1 8

heating can’t co-exist with sleep function. If 8

heating function is set, it can be cancelled by pressing sleep button, In that

case, the set temperature will be that before entering 8

heating; If sleep function is set, press buttons “Temp” and “Clock”

simultaneously to activate 8

function and cancel sleep function at the same time.

2.6.2 Set temperature is 8

and it is displayed on the indoor display panel.

2.6.3 In this mode, TURBO can’t be set and fan speed can’t be adjusted.
2.6.4 In this mode, when compressor operates, fan speed will be adjusted as follows; when compressor stops operation, indoor unit
will operate at blowing residual heat.
When Tindoor amb. ≤9

, indoor unit will operate at high speed;

Heating mode Tpreset
=20

(if cooling-only

unit, it is Fan mode,
Tpreset=25

Keep current

operation mode

Cooling mode,

Tpreset=25

Tpreset

T2 ˚C

T5 ˚C

Tamb.