Carrier 38QHC009D8S Series, Service Manual

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Minimum speed or setting speed.
The indoor fan is controlled as below:
Setting fan
speed
Actual fan speed
H+(H+=H+G)
A H（=H）
B
C
M+(M+=M+Z)
D M(M=M)
E
F
L+(L+=L+D)
G L(L=L)
H
I
T1-Td
℃
(°F)
L
L-(L-=L-D)
H
H-（H-=H-G)
M
M-(M-=M-Z)
The auto fan acts as below rules:
a
b
c
d
T1
e
9.4.2.4 Condenser temperature protection
T3
Resume
Off
Decrease
Hold
Increase
When condenser temperature temp. is more than setting value, the compressor will stop.
9.4.2.5 Evaporator temperature protection
When Evaporator temperature temp.is less than setting value, the compressor will stop.
9.4.3 Heating Mode
9.4.3.1 Compressor running rules
When T1-Ts>-
ΔT, the compressor will stop,
when T1-T
S
<ΔT-1.5
，
the compressor will be on.
ΔT is the programmed parameter of temperature compensation.
When the AC run in mute mode, the compressor will run with low frequency.
When the current is more than setting value, the current protection function will be activated and the
compressor will stop.