Carrier 42NQ012N Service Manual page 21

minutes minutes
40 40
Max 6 minutes
1 cycle
Fig. 7-4-4
<In case of C>
(1) The heating operation is performed for at least 90
minutes.
(2) The defrost operating time is 10 minutes.
Ending condition at defrost operation
(1) When the compressor current becomes 5.10A or
more during defrost operation, the defrost
operation stops and the heating operation restarts.
(The current sensor detects the compressor
current.)
(2) The defrost operation continues for at most
6 minutes or 10 minutes.
DEFROST LAMP :
·
During defrost operation, the PRE-DEF. lamp is
on and the indoor and outdoor fans are off.
·
The compressor start protection timer is inter-
looked with the PRE-DEF. lamp. So the PRE-DEF.
Lamp is off (the fans stop) for about 3 minutes
after the [ ] button is turned on. When
the compressor is turned on, the PRE-DEF. lamp
comes on. After the heat ex-changer is preheated
to about 24 °C or higher , the PRE-DEF. Lamp
goes off, and the indoor fan starts.
minutes minutes
40 40
10 minutes
− 20 −
FILE NO. SVM-10031