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Correct the LEV opening according to the difference between target discharge temperature and discharge temperature.
MXZ-2A
More than Target discharge temperature+18
Target discharge temperature+18 to Target discharge temperature+9
Target discharge temperature+9
Target discharge temperature+3.6 to Target discharge temperature-3.6
Target discharge temperature-3.6 to Target discharge temperature-9
Target discharge temperature-9
Target discharge temperature-18 or less
MXZ-3A
More than Target discharge temperature+21.6
Target discharge temperature+21.6 to Target discharge temperature+9
Target discharge temperature+9
Target discharge temperature+5.4
Target discharge temperature-5.4
Target discharge temperature-9
Target discharge temperature-21.6 or less
(2) Separate correction (COOL,DRY)
(Correction by the separate super heat)
a) Correct the LEV separately by temperature difference between each gas pipe temperature and the minimum gas pipe
temperature of all.
1 Calculate each super heat of the unit from the expression below;
(Super heat) = (Each gas pipe temperature) - (Minimum gas pipe temperature)
2 Separate correction is performed according to each super heat in the table below.
MXZ-2A
Superheat
more than 16.2
10.8 to 16.2
5.4 to 10.8
5.4 or less
Discharge temperature (˚F)
to Target discharge temperature+3.6
to Target discharge temperature-18
Discharge temperature (˚F)
to Target discharge temperature+5.4
to Target discharge temperature-5.4
to Target discharge temperature-9
to Target discharge temperature-21.6
MXZ-3A
LEV opening
correction (pulse)
3
2
1
0
LEV opening
Superheat
correction (pulse)
more than 16.2
10.8 to 16.2
5.4 to 10.8
5.4 or less
26
LEV opening
correction (pulse)
COOL
HEAT
5
8
4
3
2
1
0
0
-1
-1
-3
-2
-4
-3
LEV opening
correction (pulse)
COOL
HEAT
4
6
2
2
1
1
0
0
-1
-1
-3
-2
-8
-8
12
8
4
0
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