– 30 –
8-1-4. Prevent-Freezing Control
The indoor heat exchanger sensor detects refriger-
ant vapor temperature in COOL/DRY operation. If
the temperature is below the specified value, com-
pressor motor speed is reduced so that operation is
performed in temperature below the specified value
to prevent-freezing of indoor heat exchanger.
8-1-5. P. M. V. (Pulse Modulating Valve)
Using P.M.V., refrigerant flow of refrigeration cycle is
varied for the optimum temperature. Controlling
each unit separately by two P.M.V. corresponds to
difference of pipe length, fan speed, and unit tem-
perature.
If an error occurs on cycle temperature when power
source of the air conditioner has been turned on,
and if start/stop times of the outdoor unit are 30
times, move the valve once until it hits on the
stopper for positioning of the valve. In this case,
ticktack sound may be heard.
8-1-6. Louver Control
(1) Vertical air flow louvers
Positions of vertical air flow louvers are auto-
matically controlled according to the operation
status (AUTO, COOL, DRY, HEAT). Besides,
positions of vertical air flow louvers can be
arbitrarily set by pressing the [SET] button. The
louver position which has been set by the [SET]
button is stored in microcomputer, and the louver
is automatically set at the stored position in the
next operation.
(2) Swing
If the [AUTO] button is pressed during running
operation, vertical air flow louvers start swinging.
When the [AUTO] button is pressed again,
swinging stops.
8-1-7. Indoor Fan Control (DC Fan Motor)
The indoor fan is operated by motor speed non-step
variable DC drive system motor. For flow rate, motor
speed is controlled manually in three steps (LOW,
MED, HIGH), and with the unit of 10 rpm from upper
limit to lower limit in AUTO mode as described in
Table 8-1-2. It is not selected by relay, so selecting
sound does not generate.
Table 8-1-2
Operation Fan
M10 M13
Motor speed Air flow rate Motor speed Air flow rate
mode mode
(rpm) (m³/h) (rpm) (m³/h)
H 1100 470 1200 520
COOL M 1010 440 1140 470
L 910 380 1050 380
DRY — 810 320 820 330
H 1200 520 1280 560
HEAT M 1100 470 1100 470
L 930 390 930 390
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