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Correct the LEV opening according to the difference between target discharge temperature and discharge temperature.
Discharge temperature (˚F)
LEV opening
correction (pulse)
More than Target discharge temperature+18
Target discharge temperature+18 to Target discharge temperature+9
Target discharge temperature+9 to Target discharge temperature+3.6
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 to Target discharge temperature-18
Target discharge temperature-18 or less
COOL
5
4
2
0
-1
-3
-4
HEAT
8
3
1
0
-1
-2
-3
MXZ-2A
Discharge temperature (˚F)
LEV opening
correction (pulse)
More than Target discharge temperature+21.6
Target discharge temperature+21.6 to Target discharge temperature+9
Target discharge temperature+9 to Target discharge temperature+5.4
Target discharge temperature+5.4 to Target discharge temperature-5.4
Target discharge temperature-5.4 to Target discharge temperature-9
Target discharge temperature-9 to Target discharge temperature-21.6
Target discharge temperature-21.6 or less
COOL
4
2
1
0
-1
-3
-8
HEAT
6
2
1
0
-1
-2
-8
MXZ-3A
(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.
Superheat
LEV opening
correction (pulse)
more than 16.2
10.8 to 16.2
5.4 to 10.8
5.4 or less
3
2
1
0
MXZ-2A
Superheat
LEV opening
correction (pulse)
more than 16.2
10.8 to 16.2
5.4 to 10.8
5.4 or less
12
8
4
0
MXZ-3A
OBT16--1.qxp 06.3.29 11:20 AM Page 26