Service manual

21
In COOL operation, the two indoor coil thermistors (one main and one sub) sense temperature ununiformity (super
heat) at the heat exchanger, and when temperature difference have developed, the indoor coil thermistors adjust
LEV opening degree to get approximate 10 degrees lower temperature than the target temperature in the table
above, thus diminishing super heat.
(2) Time chart
OFF Time
Time
ON
Operational frequency
of the compressor
Commanded
to open
Standard
opening
degree
Opening degree is
corrected according
to discharge
temperature.
Positioning
Air conditioner ON
Air conditioner OFF
(thermostat off)
LEV opening degree
about 5 minutes <COOL, DRY>
about 15 minutes <HEAT>
(3) Control data
06
05
04
03
02
01
LEV opening degree
A(target discharge temperature)
B
C
D
E
F
30 50 70
Operational frequency of the compressor
90 110 130
(Hz)
A
47/41
B
53/48
C
58/55
D
63/60
E
67/65
F
67/65
(a) Reference value of target discharge temperature
(COOL/HEAT :)
01
150/110
02
190/110
03
240/150
04
280/170
05
310/200
06
340/230
(b) Reference value of LEV standard opening degree
(COOL/ HEAT pulse)
50/45
53/52 60/59
66/68
70/76 70/76
MUZ-FA25VA
MUZ-FA35VA
130/100
190/130 240/170
260/210
260/230
260/230
MUZ-FA25VA
MUZ-FA35VA
Applied model
Applied model
OBT14A--1qxp 06.1.12 1:07 PM Page 21