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1. Pre-heat control is turned ON for 15 or 30 min, after the breaker is turned ON.
2. 30 min. after the unit is stopped, pre-heat control is turned ON for 15 or 30 min. and turned OFF for 30 min."
This is repeated as shown in the graph until the breaker is turned OFF.
When outside temperature is 68 °F or below, pre-heat control is ON for 30 min."
When outside temperature is 69.8 °F or above, pre-heat control is ON for 15 min."
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
MXZ-3A30NA-
1
MXZ-4A36NA
Power ON
OFF
Compressor ON
OFF
Outside temperature
30min.
30 min. 30 min. 30 min. 30 min. 30 min. 15 min. 30 min.15 min. 30 min.
Pre-heat ON
OFF
Breaker ON
68 °F
Stop
operation
Start
operation
When outside
temperature is
above 68 °F
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 min-
utes or more.
1. Thermostat control
Thermostat is ON or OFF by difference between room temperature and set temperature.
ON -1.8 °F or more
OFF less
than
-1.8 °F
-1.3 °F
Room temperature minus
set temperature (During operation)
Room temperature minus
set temperature (Initial)
Thermostat
-1.8 °F