Mitsubishi Electric MU-A18WV-E1 Service Manual page 24

2 When the temperature difference
RT13 in the indoor unit is 2: or more for a fixed time at cool or dry operation, the target discharge temperature is
changed. After the temperature is changed, when temperature difference
is changed again. The LEV opening is controlled based on the changed target discharge temperature and the temper-
ature difference RT.
Ta (:)
more than Tb+10
Tb+5 to Tb+10
Tb+2 to Tb+5
Tb-2 to Tb+2
Tb-5 to Tb-2
Tb-10 to Tb-5
less than Tb-10
NOTE : Discharge temperature : Ta, Target discharge temperature : Tb
The target discharge temperature (Tb) is set according to the operation mode or the unit status as follows.
COOL (Normal)
COOL ( RT is less than 2:, or
COOL ( RT is 3 :or more.)
NOTE : Target discharge temperature : Tb
NOTE : When the discharge temperature (Ta) is 50: or less on the cool operation LEV opening is set in 54 pulse.
When this state continues for 20 minutes, the compressor is stopped and restarts in 3 minutes.
When the compressor is stopped, the indoor unit indicates the abnormality of refrigerant system and stops.
(OPERATION INDICATOR lamp is 10-time flashing on and off.)
(2) LEV time chart
Opening
Power ON
completely
Open
Remote
controller
ON
Initial opening
Positioning
Close
NOTE : Opening increases and decreases to be in the target discharge temperature during operation.
RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub)
less than 2:
20
10
2
0
-2
-5
-10
Operation mode
RT is 2:or more and less than 3:.)
Thermostat
Operation OFF
Standard opening
Standard opening
Thermostat
ON
Opening in stop
RT
2: or more and less than 3:
60
20
2
0
-2
-5
-10
Opening
Remote
completely
controller
Operation
OFF
Initial opening
Opening in stop
24
RT is 3: or more, the target temperature
3: or more
60
20
2
0
-2
-5
-10
Tb (:)
80
70
65
Remote
controller
ON
Standard opening
Initial opening
Positioning
Operation
Time