Carrier 42NQ012N Service Manual page 22

7-4-4. Current Limit Control
The microcontroller detects the input current so as to
prevent it exceeds a specified value by means of
controlling the outdoor fan control as described in (1)
and (2).
(1) Current limit control (Cooling operation)
Control is performed as shown below by detecting
the compressor operating current with a current
sensor (C.T).
Input current
11.0A
10.0A
(2) Current limit control (Heating operation)
Control is performed as shown in Fig. 7-4-6
Input current
11.0A
10.0A
6.1A
5.1A
Remark :
1. This function is available only for heat pump model (Cooling models have no a current sensor (C.T.)).
I4
I3
I4
I3
I2
I1
Compressor
More than I4 continues for 3 seconds
More than I3 continues for 5 minutes
Fig. 7-4-5
Compressor
More than I4 continues for 3 seconds
More than I3 continues for 5 minutes
ON
Fig. 7-4-6
− 21 −
FILE NO. SVM-10031
Outdoor fan
OFF
OFF
ON
Outdoor fan
OFF
OFF
OFF
ON