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Correct the LEV opening according to the difference between target discharge temperature and discharge temperature.
(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.
Calculate each super heat of the unit from the expression below;
(Super heat) = (Each gas pipe temperature) - (Minimum gas pipe temperature)
Separate correction is performed according to each super heat in the table below.
MXZ-2A MXZ-2B
Discharge temperature (°F/°C)
LEV opening correction (pulse)
COOL HEAT
More than Target discharge temperature+18/10 5 8
Target discharge temperature + 18/10 to Target discharge temperature + 9 /5 4 3
Target discharge temperature + 9/5 to Target discharge temperature + 3.6/2 2 1
Target discharge temperature + 3.6/2 to Target discharge temperature - 3.6/2 0 0
Target discharge temperature - 3.6/2 to Target discharge temperature - 9/5 -1 -1
Target discharge temperature - 9/5 to Target discharge temperature - 18/10 -3 -2
Target discharge temperature - 18/10 or less -4 -3
MXZ-3A MXZ-4A MXZ-3B MXZ-4B
Discharge temperature (°F/°C)
LEV opening correction (pulse)
COOL HEAT
More than Target discharge temperature + 21.6/12 4 6
Target discharge temperature + 21.6/12 to Target discharge temperature + 9/5 2 2
Target discharge temperature + 9/5 to Target discharge temperature + 5.4/3 1 1
Target discharge temperature + 5.4/3 to Target discharge temperature - 5.4/3 0 0
Target discharge temperature - 5.4/3 to Target discharge temperature - 9/5 -1 -1
Target discharge temperature - 9/5 to Target discharge temperature - 21.6/12 -3 -2
Target discharge temperature - 21.6/12 or less -8 -8
MXZ-2A20NA
Superheat (°F/°C)
LEV opening
correction (pulse)
More than 16.2/9 3
10.8/6 to 16.2/9 2
5.4/3 to 10.8/6 1
5.4/3 or less 0
MXZ-3A30NA
Superheat (°F/°C)
LEV opening
correction (pulse)
More than 16.2/9 12
10.8/6 to 16.2/9 8
5.4/3 to 10.8/6 4
5.4/3 or less 0
MXZ-3A30NA-
1
MXZ-4A36NA
MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Operation frequency
of compressor (Hz)
Target discharge temperature (°F/°C)
COOL HEAT
Number of operating unit
1 unit 2 units 3 units
4 units
(MXZ-4A/4B)
1 unit 2 unit 3 units
4 units
(MXZ-4A/4B)
Minimum ~ 14 95/35 131/55 134.6/57 140/60 125.6/52 143.6/62 122/50 122/50
15 ~ 23 107.6/42 131/55 134.6/57 140/60 136.4/58 150.8/66 131/55 122/50
24 ~ 32 120.2/49 136.4/58 145.4/63 140/60 149/65 165.2/74 140/60 122/50
33 ~ 41 136.4/58 140/60 149/65 143.6/62 154.4/68 172.4/78 152.6/67 122/50
42 ~ 50 149/65 149/65 158/70 149/65 154.4/68 172.4/78 161.6/72 131/55
51 ~ 59 154.4/68 154.4/68 163.4/73 158/70 154.4/68 172.4/78 168.8/76 140/60
60 ~ 68 158/70 158/70 167/75 158/70 154.4/68 172.4/78 168.8/76 140/60
69 ~ 77 167/75 163.4/73 176/80 161.6/72 154.4/68 172.4/78 168.8/76 140/60
78 ~ 86 167/75 167/75 179.6/82 161.6/72 154.4/68 172.4/78 168.8/76 140/60
87 ~ Maximum 167/75 176/80 179.6/82 161.6/72 172.4/78 172.4/78 168.8/76 140/60