Mitsubishi Electronics MUY-ANA Benutzerhandbuch

New publication, effective Apr. 2006
Specifications subject to change without notice.

C

C

HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Fan speed is switched according to the number of operating indoor unit and the compressor frequency.

Note
• When the indoor coil thermistor is 134.6˚F or more on HEAT operation, fan speed is fixed to Low speed.

Or, the indoor coil thermistor is 113˚F or less on HEAT operation, fan speed is back to normal.

(1) Conditions to enter defrosting mode

1

. When temperature of defrosting thermistor is 26.6˚F or less.

2

. When specified non-defrosting time, is counted in the control p.c. board is satisfied.

(Total time of compressor operating)
Going to defrosting mode at both condition of 

1

and 

2

.

(2) Defrosting operation

1

. Compressor stops for 50 seconds, Indoor fan is off, Defrosting lamp lights.

2

. 4-way valve reverses flow, Compressor operates by the frequency in heat defrosting control.

3

. After compressor stops for 35 seconds, 4-way valve reverses flow, then defrosting finishes.

(3) Conditions to finish defrosting mode

1

. When the defrosting thermistor temperature is 55.76˚F or more.

2

. When it has spent 10 minutes for defrosting.

Defrosting finishes at condition of 

1

or 

2

.

This protection controls the compressor ON/OFF and operation frequency according to temperature of the discharge 
temperature thermistor.
(1) Compressor ON/OFF

When temperature of the discharge temperature thermistor exceeds 240.8˚F, the control stops the compressor.
When temperature of the discharge temperature thermistor is 176˚F or less, the controls starts the compressor.

(2) Compressor operation frequency

When temperature of the discharge temperature thermistor is expected to be higher than 240.8˚F, the control decreases 12Hz
from the current frequency.
When temperature of the discharge temperature thermistor is expected to be higher than 231.8˚F and less than 240.8˚F, the
control decreases 6Hz from the current frequency.
When temperature of the discharge temperature thermistor is expected to be higher than 219.2˚F and less than 231.8˚F, the
control is set at the current frequency.

COOL

Fan speed

Up

Down

Up

Down

Mode

HEAT

Compressor frequency

<Relation between compressor frequency and fan speed.>

40Hz

30Hz

40Hz

30Hz

Up

Down

Fan speed

High

Low

Compressor frequency

Min.

Max.

OBT16--1.qxp  06.3.29 11:20 AM  Page 28