Lev Control - Mitsubishi Electric MSZ-G09SV Service Manual

9-25. LEV control

Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit.
Indoor unit status
Stop
Thermostat OFF in
COOL or DRY mode
Thermostat ON in
COOL or DRY mode
Thermostat OFF in HEAT mode
Thermostat ON in HEAT mode
w1 LEV opening when the outdoor unit operating: Upper limit 500 pulse, Lower limit 59 pulse.
1 2
320
300
280
260
240
220
200
180
7 20
Operation frequency of compressor (Hz) : F
COOL 250
HEAT 180
• LEV opening correction by discharge temperature
The target discharge temperature is determined according to frequency zone.
Operation frequency
of compressor
Minimum ~ 20
21 ~ 33
34 ~ 46
47 ~ 59
60 ~ 72
73 ~ 85
86 ~ 98
99 ~ 111
112 ~ Maximum
Opening before stop
Maintain LEV opening before stop
• LEV opening is determined by adding adjustment in accordance
with the operation frequency:
• After starting operation, adjustment in accordance with intake, discharge
temperature is included in standard opening. w1
Note: LEV opening in each frequency at DRY operation and COOL operation is the
same. However, velocity and compressor operation frequency controls are
different.
Maintain LEV opening before stop
• LEV openingis determined by adding adjustment in accordance with the operation
frequency:
• After starting operation, opening becomes the one that adjustment in accordance
with discharge temperature was added to standard opening. w1
Standard opening
3 4 5
40 60 80
Standard opening
1 2 3 4
260 270 280
190 200 210
COOL, DRY
50
55
60
65
70
75
80
85
90
LEV opening
500 pulse in 15 minutes
500 pulse in 15 minutes
500 pulse in 15 minutes.
6 7 8
100 120 140
5 6 7 8
290 290 305 305
220 230 240 240
61
COOL
HEAT
HEAT
50
55
55
60
65
70
75
80
85