Carrier QHC Series Service Manual page 31

T1-Td+ΔT
9.4.3.4Defrosting mode
AC will enter the defrosting mode according to the value of temp. of T3 and the value range of temp.
change of T3 and also the compressor running time.
During the defrosting mode, the compressor keep running, indoor and outdoor motor will stop, defrost
lamp of the indoor unit will be lighted "
." Will be displayed.
9.4.3.5 Evaporator coil temperature protection
T2
Off
Decrease
Hold
Resume
When evaporator temperature temp. is more than the setting protection value, the compressor will
stop.
9.4.4 Auto-mode
This mode can be chosen with remote controller and the setting temperature can be changed between
17° C~30° C
In auto mode, the machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts).
29