Service Manual -
VMH 9/12/18/24 SU & VMH30/36S D Series
16
18
8.4 Operation Modes and Functions
8.4.1 Fan mode
medium, low and auto.
When the setting temp. is reached, if the
compressor stop
s
running, indoor fan motor
will run in Minimum speed or set 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:
When condenser temperature temp. is
more than setting value, the compressor will
stop.
8.4.2.5 Evaporator temperature protection
When
E
vaporator temperature
is less than
setting value, the compressor will stop
.
8.4.3 Heating Mode
8.4.3.1 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.
a
b
c
d
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:
T1
8.4.2 Cooling Mode
8.4.2.1 Compressor running rules
When T1-Ts<-2
℃
(28.4°F), the compressor will
stop, when T1
—
T
S
>-0.5
℃
(31.1°F),
the
compressor will be activated.
When the AC run
s
in mute mode, the
compressor will run
at
low frequency. When
the current is more than set value, the current
protection function will be activated, and the
compressor will stop.
8.4.2.2 Outdoor fan running rules
The outdoor unit will be run at different fan
speed
s
according to T4.
For different outdoor units, the fan speeds are
different
.
T
4
A +
A
B
C
D
E
a
b
c
d
T1
T3
Resume
Off
Decrease
Hold
8.4.2.
4
Condenser temperature
p
rotection
e
8.4.2.3 Indoor fan running rules
In cooling mode, indoor fan runs all the time
and the speed can be selected as high,
e