Mitsubishi Electronics Essential Pre-Heat Control and Cool Operation Functions for MXZ-3A30NA Air Conditioners

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3-7. PRE-HEAT CONTROL MXZ-2A20NA- 1 MXZ-3A30NA- 1

MXZ-4A36NA

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.

Power ON

OFF

Compressor ON

OFF

Outside temperature 68 °F

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

Start

Stop

When outside

 

operation

operation

temperature is

 

 

 

above 68 °F

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.

3-8. COOL OPERATION

1.Thermostat control

Thermostat is ON or OFF by difference between room temperature and set temperature.

 

Room temperature minus

Room temperature minus

Thermostat

set temperature (Initial)

set temperature (During operation)

ON

-1.8 °F or more

 

 

 

 

 

OFF

less than -1.8 °F

 

 

 

 

 

 

 

 

 

 

-1.8 °F -1.3 °F

 

 

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.

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Contents Revised EDITION-B ContentsRevision a MXZ-2A20NA MXZ-3A30NA MXZ-4A36NA MS-A09WA MU-A09WA MS-A12WA MU-A12WACool Operation MS-AWA MU-AWAOperation time chart Example When the room temperature is under 73 FHorizontal vane Auto Vane OperationMSZ-A MSY-A MSZ-FD MSZ-D MSY-D Low outside temperature operationMSZ-ANA MSY-ANA MSZ-FDNA MSY-DNA MSZ-DNA MUZ-ANA MUY-ANA MUZ-FDNA MUY-DNA MUZ-DNAHeat Operation MSZ Defrosting MSZ-A24Gradation of fan speed in initial Overload startingMode selection Auto Change Over ··· Auto Mode Operation MSZMUZ-A MUY-A Outdoor FAN Motor ControlMUZ-FD MUZ-D MUY-D MUZ-FD Inverter System ControlFunction of main parts MUZ-A24 MUY-A24 MUZ-D MUY-D Input current waveform without PAM Outline of simple partial switching methodAt normal operation Purpose of PAM adoptionElimination of electrical noise Intelligent power moduleCompressor Control Method of Rotation Times Sine wave controlMUZ-FD09 Operational Frequency Control of Outdoor UnitMUZ-FD12 Pulse MUZ-A09/12/15/17 MUY-A15/17 Cool · DRY ModeHeat Mode Expansion Valve Control LEV ControlMUZ-A24 MUZ-A09/12MUZ-A15/17 MUY-A15/17260 MXZ-ANA Inverter main power supply circuitProtects transistors from over current Opening before stop → 500 pulse in 15 minutes MXZ-3A30NA MXZ-2A20NA/3A30NAMXZ-2A20NA Cool HeatMXZ-3A30NA MXZ-2A20NAMXZ-4A36NA MXZ-2A20NA Exclusive LEVReceiver LEV MXZ-3A30NA Exclusive LEVCool DRY Heat MXZ-3A MXZ-4A MXZ-2A20NAMXZ-3A30NA MXZ-2A∆RT Operational Frequency RangeMXZ-4A Discharge Temperature Protection ControlHeat Defrosting Control Outdoor FAN ControlPRE-HEAT Control MXZ-2A20NA- 1 MXZ-3A30NA MXZ-4A36NA Made in Japan DRY OperationHeat Operation High pressure protection
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