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The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode.
Exclusive LEV
COOL
Receiver LEV
Exclusive LEV
HEAT
Receiver LEV
wIn COOL mode, the two indoor coil thermistor (one main and one sub) sense temperature ununiformity (super heat) at the
heat exchanger, and when temperature difference have developed, the indoor coil thermistors adjust LEV opening to dimin-
ish the super heat.This action is called Evaporation Temperature Protection.
The opening pulse of the Receiver LEV is fixed to the standard No.3 in cooling operation, and so is that of each Exclusive
LEV in heating operation.
However the opening pulse will be changed to the standard No.4 or No.5 when the discharge temperature protection or high-
pressure protection is working.
In addition to that, it will also be changed to standard No.2 or No.1 when the opening pulse of the each Exclusive LEV
becomes 100 pulse or less in cooling operation or so does that of Receiver LEV in heating operation.
<MXZ-2A>
Number of
operating
indoor units
Standard No.
1
2
3
4
5
<MXZ-3A>
Number of
operating
indoor units
Standard No.
1
2
3
4
5
Circulation
Capacity
Amount
Distribution
Control
Indoor heat
Exclusive
exchanger
LEV
(MXZ-3A)
COOL
1 unit
200
300
400
450
500
COOL
1 unit
2 units
150
250
250
320
350
360
400
410
450
460
Discharge
Temperature
Protection
Outdoor
heat
exchanger
Receiver
Receiver
LEV
LEV opening (pulse)
2 units
1 unit
150
120
320
140
360
160
410
220
500
280
LEV opening (pulse)
3 units
1 unit
250
250
320
300
370
450
420
460
470
470
23
wEvaporation
High
Pressure
Temperature
Protection
Protection
HEAT
2 units
120
140
160
220
280
HEAT
2 units
3 units
250
250
300
300
380
380
400
390
450
440
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