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1. Pre-heat control is turned ON for 15 or 30 minutes, after the breaker is turned ON.
2. 30 minutes after the unit is stopped, pre-heat control is turned ON for 15 or 30 minutes and turned OFF for 30 minutes.
This is repeated as shown in the graph until the breaker is turned OFF.
When the defrost thermistor reads less than 69.8°F, pre-heat control is ON for 30 minutes.
When the defrost thermistor reads 69.8°F or more, pre-heat control is ON for 15 minutes.
NOTE: When the unit is started with the remote controller, pre-heat control is turned OFF.
Compressor uses 50 W when pre-heat control is turned ON.
3-7. PRE-HEAT CONTROL
MXZ-2A20NA-
1
,
2
MXZ-3A30NA-
1
MXZ-4A36NA MXZ-2B20NA MXZ-2B20NA-
1
MXZ-3B24NA MXZ-3B30NA
MXZ-4B36NA
Power ON
OFF
Compressor
ON
OFF
Pre-heat ON
OFF
Breaker ON
69.8°F
(21°C)
Stop
operation
Start
operation
Defrost thermistor
30 minutes 30 minutes 30 minutes 30 minutes 30 minutes 30 minutes
15
minutes
15
minutes
30minutes
30minutes
When the defrost
thermistor reads
69.8°F(21°C) or more
The compressor is energized even while it is not operating.
This is to generate heat at the winding to improve the compressor's start-up condition.
3-8. COOL OPERATION
2. Coil frost prevention
The compressor operational frequency is controlled to prevent the indoor heat exchanger temperature from falling exces-
sively.
Compressor is turned OFF for 5 minutes when temperature of indoor coil thermistor continues 37.4°F or less for 5 minutes
or more.
1. Thermostat control
Thermostat turns ON or OFF by the difference between room temperature and set temperature.
ON -1.8°F(-1°C) or more
OFF less than -1.8°F(-1°C)
-1.8°F
-1.35°F
(-1°C)
(-0.75°C)
Room temperature minus
set temperature (During operation)
Room temperature minus
set temperature (Initial)
Thermostat