Service manual
4.
Heater control
(1) When all listed conditions are satisfied and 30 sec. elasped, power is supplied to the heater.
Oln heating mode
@Indoor fan speed is faster than LO.
@Room temp. thermostat
is
on.
@By temperature of Heater control thermistor RT13
ON OFF (Heater ON/OFF)
MSH-O9DW
131'F 140F
MSH-12/15DN
142'F 151°F
@By differential between set temp. and room temp.
5
deg. ('F)
:
ON, below 4 deg. ('F)
:
OFF
@Not in heating defrost mode
(2) If one of above conditions are not satisfied, the heater tums off.
owhen system is stopped by pressing the power button, the indoor fan operates for 30 sec. in LO
speed
to eliminate
the remaining heat.
owhen the room temp. thermostat is off, the indoor fan operates at VLO (Very LO)
speed.
(3) Power
is
not supplied to the heater under following condition even
if
ail above condions are satisfied.
owen the in&mr coil, thermistor RT12 is over 104F and the heater control thermistor RT13 is disconnected.
5.
Discharge
Protection
When the discharge temp. is too high because of unit gas leakage or other reason, the discharge temp. thermistor RT62
stops compressor in order to protect compressor from burning.
MSHO9-DW
MSH-12DN
Discharge protection operates in
"I
FEEL CONTROL", COOL, DRY, and HEAT mode.
2.
COOL operation
(1) Press POWER button.
Power lamp of the indoor unit tums on with a beep tone.
Indoor fan continues to operate regardless of thermostat's OFF-ON.
Coil frost prevention is same as COOL mode of
"I
FEEL CONTROL".
(2) Select COOL mode.
(3)
Set
the SET TEMP. button.
The setting range is
59
--
89'F.
*"I
FEEL CONTROL" buttons
are
not available.
3.
DRY
operation
(1) Press POWER ON/OFF button.
Power lamp of the indoor unit tums on with beep tone.
(2) Select DRY mode.
(3)
Indoor fan operates at VLO
speed.
(4)
After 2 min. the microprocessor reads the room temp.
and decides the set temp. Set temp. will
be
as follows.
65 70
75
80 85
90
95
100'F
Initial
room
temp.
Thermostat (SET TEMP.) is not available. The other operations are same as DRY mode of
"I
FEEL CONTROL".
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