Carrier QHC Series Service Manual page 30

9.4.3.2 Outdoor fan running rules
The outdoor unit will be run at different fan speed according to T4.
For different outdoor units, the fan speeds are different
T4
E
D
C
B
A
9.4.3.3 Indoor fan running rules
When the compressor is on, the indoor fan can be set to high/med/low/auto/mute.
When indoor unit coil temp. is low, the anti-cold air function will start and indoor fan motor will run at
low speed, the speed can't be changed ,when the temp. is lower than setting value, the indoor fan
motor will stop.
When the indoor temp reaches the setting temp., the compressor will stop, the indoor fan motor will
run at the minimum speed or setting speed.(The anti-cold air function is valid).
The indoor fan is controlled as below:
Setting fan
T1-Td℃
speed
H
M
L
Auto fan action in heating mode:
Actual fan speed
H-（H-=H-G)
H（=H）
H+(H+=H+G)
M-(M-=M-Z)
M(M=M)
M+(M+=M+Z)
L-(L-=L-D)
L(L=L)
L+(L+=L+D)
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