Mitsubishi Electric MSC-GE-VB – E Service Technical Manual page 13

(2) Cold air prevention control
When the compressor is not operating,
( ) if the temperature of room temperature thermistor is less than 19°C, the fan stops.
( ) if the temperature of room temperature thermistor is 19°C or more and
( ) if the temperature of indoor coil thermistor is less than 0°C, the fan stops.
( ) if the temperature of indoor coil thermistor is 0°C or more, the fan operates at Very Low.
When the compressor is operating,
( ) if the temperature of indoor coil thermistor is 40°C or more, the fan operates at set speed.
( ) if the temperature of indoor coil thermistor is less than 40°C and
( ) if heating operation starts after defrosting, the fan stops.
( ) if the temperature of room temperature thermistor is 19°C or less, the fan stops.
( ) if the temperature of room temperature thermistor is more than 19°C, the fan operates at Very Low.
NOTE: When 3 minutes have passed since the compressor started operation, this control is released regardless of the
temperature of room temperature thermistor and indoor coil thermistor.
(3) Warm air control (MSZ-FD)
When the following any condition of
works.
a.) Fan speed is used in MANUAL.
b.) When cold air prevention has been released.
c.) When defrosting has been finished.
When the temperature of indoor coil thermistor is less than 40°C.
When warm air control works, the fan speed changes as follows to blow out warm air gradually.
Gradation of fan speed in initial
The upper limit of the fan speed in MANUAL is the set speed.
When the temperature of indoor coil thermistor has been 40°C or more, or when the set speed has been changed, this
control is released and the fan speed is the set speed.
3. Overload starting
When the room temperature thermistor reads 18°C or more, the compressor runs with its regulated maximum frequency for
a few minutes after the start-up.
4. Defrosting
(1) Starting conditions of defrosting
When the following conditions a) ~ c) are satisfied, the defrosting starts.
a) The defrost thermistor reads: -3°C or less (GC, HC, FD25/35, GE).
b) The cumulative operation time of the compressor has reached any of the set values (defrost interval: 40-150 min-
utes).
c) More than 5 minutes have passed since the start-up of the compressor.
The defrost interval is decided by the previous defrosting time. The next defrost interval extends or shortens 0-20
minutes compared with the previous defrost interval.
(2) Releasing conditions of defrosting
Defrosting is released when any of the following conditions are satisfied:
a) The defrost thermistor continues to read following temperature for 30 seconds:
• 5°C or more (GC•VA, HC, FD25/35, GE25/35/42)
• 8°C or more (GC•VAH, FD50)
• 15°C or more (GE50)
b) Defrosting time exceeds 10 minutes.
c) Any other mode than HEAT mode is set during defrosting.
(a. ~ c.) and the condition of
<Time condition> <Indoor fan speed>
Less than 2 minutes ------------ Low
2 to 4 minutes -------------------- Med.
More than 4 minutes ----------- High or Super high
-0.6°C or less (FD50).
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are satisfied at the same time, warm air control