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MXZ-2A20NA/3A30NA
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
In COOL mode, the two indoor coil thermistors (one main and one sub) sense temperature ununiformity (super heat) at the
heat exchanger, and when temperature difference develops, the indoor coil thermistors adjust LEV opening to diminish 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-2A20NA>
Number of
operating
indoor units
Standard No.
1
2
3
4
5
<MXZ-3A30NA>
Number of
operating
indoor units
Standard No.
1
2
3
4
5
Circulation Amount
Capacity Distribution
Control
○
×
×
○
Indoor heat
Exclusive
exchanger
LEV
(MXZ-3A30NA)
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 opening (pulse)
2 units
150
320
360
410
500
LEV opening (pulse)
3 units
250
320
370
420
470
24
Evaporation
High Pressure
Protection
○
○
○
○
LEV
HEAT
1 unit
120
140
160
220
280
HEAT
1 unit
2 units
250
250
300
300
450
380
460
400
470
450
Temperature
Protection
○
○
—
—
2 units
120
140
160
220
280
3 units
250
300
380
390
440
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