Mitsubishi Electric MS-A WA Service Technical Manual page 25

Determination of LEV standard opening in each indoor unit
• The standard opening is on the straight line, which connects an each standard point in the section where divided into
seven according to the operation frequency of compressor as shown in the figure below.
(LEV opening is controlled in proportion to the operation frequency.)
NOTE: Opening is adjusted at the standard opening according to the indoor unit conditions.
However, inclination of standard opening in each point of opening does not change with the original curve.
• Add opening provided in Difference in capacity in the table below to the standard opening from 1 to 8, when capacity
of the indoor unit is excluding code 1.
• Add opening provided in Difference in operation number in the table below to determined LEV opening for each
indoor unit, when 2 or 3 indoor units are operated at the same time.
NOTE: Even when the adjusted standard opening exceeds the driving range from 59 to 500 pulse, actual driving out-
put opening is in a range from 59 to 500 pulses.
MXZ-2A20NA
LEV Opening (code) 1 2
COOL 120 130 136 146 156 160 170 180 190 200
HEAT 100 110 120 130 146 160 170 180 190 200
Code3,4 Code5,6 Code7,8 Code9,10 Code11,12 Code13,14 Code15or above
COOL 3
HEAT 3
MXZ-3A30NA
LEV Opening (code) 1 2
COOL 126 130 134 138 140 142 182 228 296 310
HEAT 140 146 150 170 180 200 224 244 272 280
Code3,4 Code5,6 Code7,8 Code9,10 Code11,12 Code13,14 Code15or above
COOL 3
HEAT 3
10
09
08
07
06
05
04
03
02
01
23 38 54 69
14 23 32 41
Compressor operating frequency (Hz)
Standard opening (pulse)
3 4 5 6 7
Difference in capacity
6 9 12
6 9 52
Standard opening (pulse)
3 4 5 6 7
Difference in capacity
6 9 12
6 9 52
4Hz
84 100 115 131 146 MXZ-2A/2B
50 59 68 77 86 MXZ-3A/4A
8 9 10
15 25 35
55 65 75
8 9 10
15 25 35
55 65 75
25
Difference in operation number
2
-20
0
Difference in operation number
2 3
-20 -30
0 0