Cool Operation; Dry Operation; R.v. Coil Control; Outdoor Temperature Control - Mitsubishi Electric MSH09TW Service Manual

4. R.V. coil control

Heating · · · · · ON
Cooling · · · · · OFF
Dry · · · · · · · · OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
Compressor
R.V. coil
Outdoor fan
5. Outdoor temperature control <MSH09TW -
When the temperature of the ambient temperature thermistor RT63 falls below 19°F, the compressor stops for protecting
the unit.
NOTE: If the temperature of RT63 reads from 19°F to 29°F at the air conditioner starting, compressor operates.

10-2. COOL OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with the OPERATION SELECT button.
(3) Press the TEMPERATURE buttons.
(TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 59 ~ 89˚F
Indoor fan continues to operate regardless of thermostat's OFF-ON at set speed.
Coil frost prevention is as same as COOL mode of "I FEEL CONTROL".

10-3. DRY OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on
with a beep tone.
(2) Select DRY mode with the OPERATION SELECT button.
(3) The microprocessor reads the room temperature and
determines the set temperature. Set temperature is as
shown on the right chart.
Thermostat (SET TEMP.) does not work.
The other operations are same as DRY mode of "I FEEL
CONTROL".
(4) DRY operation will not function when the room tempera-
ture is 55˚F or below.
10-4. HEAT OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on
with a beep tone.
(2) Select HEAT mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO
COOL button) to select the desired temperature.
The setting range is 59 ~ 89˚F.
(4) Indoor fan speed control, high pressure protection, defrost-
ing, 4-way valve control are the same as HEAT mode of "I FEEL CONTROL".
(COOL / DRY)
5 sec.
ON
OFF
ON
OFF
ON
OFF
, MSH12/15/17TN-
U1
19°F 29°F
(HEAT)
5 sec.
, MSH12/15TN-
U1
COMPRESSOR
ON
OFF
°F
95
86
77
68
59
50
50 59
60
ON
OFF
ON
OFF
ON
OFF
>
U2
68 77 86 95°F