Mitsubishi Electric MS-18RV-E1 Service Manual page 43

9-9. LEV control <MS-30RV only>
LEV (Expansion valve) is controlled by "Thermostat ON" commands given from the unit.
Controlled range
Drive speed
Opening set
Stop of indoor unit
Remote controller ON
Power ON (Breaker ON)
Approximate for 2 minutes since
compressor has started.
From approximate 2 minutes to
approximate 13 minutes
(for 11 minutes) since compressor
has started.
After 13 minutes passed since
compressor has started.
At thermostat OFF
At thermostat ON
At remote controller OFF
(1) LEV opening correction by discharge temperature
The LEV opening is corrected according to the temperature difference between target discharge temperature (Tb) and
actual discharge temperature (Ta).
1 The LEV correction is used properly for two kinds according to the LEV opening status at operation off.
Rank
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
Minimum : 54 pulse, Maximum : 500 pulse
30 ~ 90 pulse / second
The setting is always in opening direction.
(When closing LEV, open the LEV to adjust to set opening after closing the
LEV at once.)
Opening in stop : 150 pulse
after 3 minutes passed.
LEV positioning (LEV is closed completely at once)
LEV is positioned. However, afterwards, LEV is not positioned at the first
remote controller ON.
Opening is set by the initial opening.
(Initial opening is set according to each operation modes and
outer temperature conditions.)
Opening is set by standard opening.
(Standard opening is set according to each operation modes and
outer temperature conditions.)
LEV opening is corrected to be once every 2 minutes so that discharge
temperature becomes the target discharge temperature.
(When the discharge temperature is lower than target one : LEV is corrected in
closed direction, when the discharge temperature is higher than target one :
LEV is corrected in opening direction.)
Opening in stop : 150 pulse
3 minutes passed.
Same as the starting of compressor operation
Opening in stop : 150 pulse
completely at the speed of 4 pulse every 5 seconds in opening after about
3 minutes passed.
Opening immediately before having stopped last time
100 pulse or less
Cooling
5
2
1
0
-1
-2
-5
43
LEV opening is set to becomes 500 pulse
LEV is set to the initial opening after about
LEV is set so that the opening is opened
100 pulse or more
Cooling
20
10
2
0
-2
-5
-10