Carrier 38QHC009D8S Series, Service Manual

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9.4 Operation Modes and Functions
9.4.1 Fan mode
( 1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled, and no setting temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates same as in cooling mode.
(5) Auto fan:
a
b
c
d
T1
e
9.4.2 Cooling Mode
9.4.2.1 Compressor running rules
When T1-Ts<
ΔT -2
℃
, the compressor will stop,
when T1
—
T
S
>
ΔT -0.5
℃，
the compressor will be activated.
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.
9.4.2.2 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
A
B
C
D
E
9.4.2.3Indoor fan running rules
In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low and
auto.
When the setting temp. is reached, if the compressor stop running, indoor fan motor will run in