Thermal Zone 12H47YIMI, Service Manual

Page: 32 / 82

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8.4 Operation Modes and Logic
8.4.1 Fan Mode
•
Outdoor fan and compressor stop running.
•
Temperature setting is disabled and not shown.
•
Indoor fan can be set to high/med/low/auto.
•
Louver operates in the same way as cooling mode.
•
Auto fan logic
8.4.2 Cooling Mode
8.4.2.1 Compressor Operation Logic
When T1-Ts<
Δ
T - 3.6 °F, the compressor will stop,
When T1
—
Ts >
Δ
T - 1°F
，
the compressor will be activated.
Δ
T is the programmed parameter of temperature compensation.
When Silence feature is activated, 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.
8.4.2.2 Outdoor Fan Logic
The outdoor unit will be run at different fan speed according to T4.
For different outdoor units, the fan speeds are different.
8.4.2.3 Indoor Fan Logic
When the compressor is on, the indoor fan can be set to high/med/low/auto. And the anti-cold
wind function has the priority.
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)
a
b
c
d
T1
°F
e
a
b
c
d
T1
°F
e