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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,
compressor motor speed is reduced so that opera-
tion 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.
After the power has been turned on, when a serial
operation signal is received from indoor at the first
time, or when PMV alarm is detected and the
equipment is reactivated, 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
RAS-10YKV-E RAS-13YKV-E
Operation
mode
Fan mode
Motor speed
(rpm)
Air flow rate
(m³/h)
Motor speed
(rpm)
Air flow rate
(m³/h)
H 1120 480 1210 530
M 980 400 1020 420COOL
L 850 330 850 330
DRY — 820 320 820 320
H 1200 520 1270 560
M 1070 450 1100 470HEAT
L 930 380 930 380