<SWING operation>

In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”. According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided. Then when the downward blow has been finished, next horizontal blow time is decided.

For initial 10 minutes the swing operation is performed in table G~H for quick cooling.

Also, after 10 minutes when the difference of set temperature and room temperature is more than 3.6 °F, the swing operation is performed in table D~H for more cooling.

The air conditioner repeats the swing operation in various cycle as follows.

 

Temperature of indoor

Downward blow time

Horizontal blow time

 

coil thermistor (°F)

(second)

(second)

A

59 or less

2

23

B

59 to 63

5

20

C

63 to 64

8

17

D

64 to 68

11

14

E

68 to 70

14

11

F

70 to 72

17

8

G

72 to 75

20

5

H

more than 75

23

2

2-7. INVERTER SYSTEM CONTROL

2-7-1. Inverter main power supply circuit

MUZ-A09/12/15/17 MUY-A15/17

MUZ-FD

POWER SUPPLY

NOISE FILTER CIRCUIT

 

DIODE

 

 

CURRENT

REACTOR

 

 

TRANSFORMER

MODULE1

P

U

U

RESISTOR

~ +

~

+ SMOOTHING

V

MS

 

-

 

CAPACITOR

V 3~

 

 

W

RELAY

 

 

N

W

 

 

IPM

 

 

COMPRESSOR

 

 

 

~ +

~

SWITCHING

 

 

DIODE

-

 

POWER

 

 

MODULE2

 

TRANSISTOR

 

 

 

 

BOOSTER CHOPPER CIRCUIT

Function of main parts

 

 

NAME

FUNCTION

 

 

 

INTELLIGENT POWER MODULE (IPM)

It supplies three-phase AC power to compressor.

 

 

 

SMOOTHING CAPACITOR

It stabilizes the DC voltage and supply it to IPM.

 

 

 

CURRENT TRANSFORMER

It measures the current of the compressor motor.

 

 

 

DIODE MODULE 1

It converts the AC voltage to DC voltage.

 

 

 

RESISTOR

It absorbs the rush current not to run into the main power supply circuit when

the electricity turns ON.

 

 

RELAY

It short-circuits the resistance which restricts rush current during the normal

operation after the compressor startup.

 

 

BOOSTER

DIODE MODULE 2

 

 

It improves power factor.

 

CHOPPER

SWITCHING POWER TRANSISTOR

CIRCUIT

 

It controls the bus-bar voltage.

REACTOR

 

 

 

 

 

 

12

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Mitsubishi Electronics MS-AWA, MUZ-ANA - U, MUY-ANA, MU-AWA manual Inverter System Control, Muz-Fd, Function of main parts
Page 11 Page 13

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