3-4. HEAT DEFROSTING CONTROL

(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.

3-5. DISCHARGE TEMPERATURE PROTECTION CONTROL

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.

3-6. OUTDOOR FAN CONTROL

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

Fan speed

High

Low

Down Up

Min. Compressor frequency Max.

<Relation between compressor frequency and fan speed.>

Mode

Fan speed

Compressor frequency

COOL

Up

40Hz

Down

30Hz

 

HEAT

Up

40Hz

Down

30Hz

 

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.

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

CCopyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD

Distributed in Apr. 2006. No. OBT16 7

New publication, effective Apr. 2006

Made in Japan

Specifications subject to change without notice.

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Mitsubishi Electronics MS-AWA Heat Defrosting Control, Discharge Temperature Protection Control, Outdoor FAN Control, 40Hz

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