Dry Operation; Heat Operation - Mitsubishi Electric MS-A WA Service Technical Manual

3-9. DRY OPERATION

1. Thermostat control
Thermostat turns ON or OFF by the difference between room temperature and set temperature.
Thermostat
2. Coil frost prevention
Coil frost prevention is as same as COOL mode. (3-8.2.)

3-10. HEAT OPERATION

1. Thermostat control
Thermostat turns ON or OFF by the difference between room temperature and set temperature.
MXZ-2A/3A/4A
Thermostat
MXZ-2B/3B/4B
Thermostat
2. High pressure protection
In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera-
tional frequency is controlled to prevent the condensing pressure from increasing excessively.
Room temperature minus
set temperature (Initial)
ON
OFF
Room temperature minus
set temperature (Initial)
ON less than 3.6°F(2°C)
OFF 3.6°F(2°C) or more
Room temperature minus
set temperature (Initial)
ON less than 3.6°F(2°C)
OFF 3.6°F(2°C) or more
-3.6°F(-2°C) or more
less than -3.6°F(-2°C)
34
Room temperature minus
set temperature (During operation)
-3.6°F -1.35°F
(-2°C)
(-0.75°C)
Room temperature minus
set temperature (During operation)
3.15°F 3.6°F
(1.75°C) (2°C)
Room temperature minus
set temperature (During operation)
1.35°F 1.8°F
(0.75°C) (1°C)