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12-5. 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 116:, the control stops the compressor.
When temperature of the discharge temperature thermistor is 80: (2A/3A/4A71/4A80VA
less, the controls starts the compressor.
(2) Compressor operation frequency
When temperature of the discharge temperature thermistor is expected to be higher than 116:, the control decreases 12Hz
from the current frequency.
When temperature of the discharge temperature thermistor is expected to be higher than 111: and less than 116:, the con-
trol decreases 6Hz from the current frequency.
When temperature of the discharge temperature thermistor is expected to be higher than 104: and less than 111:, the con-
trol is set at the current frequency.
12-6. REFRIGERANT RECOVERY CONTROL ON HEATING
MXZ-2A30VA MXZ-2A40VA MXZ-2A52VA
<Control status>
The control performs when the all the following status are satisfied;
• When one or more indoor units are operating in HEAT mode. (Excluding thermostat OFF)
• When discharge temperature becomes 107: or more.
• When it passed 60 minutes or more since the operation has started or the last refrigerant recovery has controlled.
<Control details>
LEV opening of indoor unit not operating is controlled to be 80 pulse.
<Control finish status>
The control finishes either as follows. However, the LEV opening is considered to be 59 pulse.
• When it passed 60 seconds since the control has started.
• When the discharge temperature is 90: or less.
12-7. OUTDOOR FAN CONTROL
Fan speed is switched according to the number of operating indoor unit and the compressor frequency.
Fan speed
Down
High
Low
Min.
Compressor frequency
<Relation between compressor frequency and fan speed>
Mode
Fan speed
COOL
HEAT
Note
• When the indoor coil thermistor is 57: or more on HEAT operation, fan speed is fixed to Low speed.
Or, the indoor coil thermistor is 45: or less on HEAT operation, fan speed is back to normal.
Up
Max.
MXZ-2A30VA
MXZ-2A40VA-
Up
56
Down
42
Up
56
Down
42
Compressor frequency (Hz)
MXZ-2A40VA-
E1
MXZ-2A52VA
MXZ-3A54VA
E2
MXZ-4A71/80VA-
E1
40
30
40
30
161
-
-
)/ 100°C (4A80VA
E1
E2
MXZ-4A80VA-
E2
MXZ-5A100VA
50
40
50
40
/5A) or
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