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– 28 –
(5) Limit for maximum compressor motor speed
by indoor fan speed
When outdoor temperature sensor detected
32°C or lower, and indoor heat exchanger
sensor detected 17°C or lower, the maximum
compressor motor speed is limited by the indoor
fan speed.
For example, the compressor motor speed is
limited as described in the table below.
Table 8-2-1
Air flow rate
RAS-10YKV-E RAS-13YKV-E
(rps) (rps)
HIGH 56 85
M+ 49 71
MED. 43 57
L–, L 36 44
UL, SUL 30 30
(7) Discharge temperature control
(Common control to cooling and heating)
The discharge temperature of refrigerant gas
from the compressor is detected by the dis-
charge temperature sensor, and controls operat-
ing compressor motor speed.
1) Control 1 (A zone) : Normal operation zone
When TD detect value is 98°C or lower, the
operation is performed with operating motor
speed instructed by the serial signal.
2) Control 2 (B zone) : Slow-up zone of motor
speed
When TD detect value is 98°C or higher,
operating motor speed is slowly up.
3) Control 3 (C zone) : Keep zone
When TD detect value is 105°C or higher,
operating motor speed is not changed if
raising operation speed.
4) Control 4 (D zone) : Slow down zone of motor
speed
When TD detect value is 108°C or higher,
operating motor speed is slowly down.
5) Control 5 (E zone) : Normal down of motor
speed
When TD detect value is 112°C or higher,
operating motor speed is down.
6) Control 6 (F zone) : Operation stop zone
If TD detect value exceeds 117°C during
operation, stop the operation immediately.
Then, restart the operation when TD detect
value becomes 105°C or lower.
Fig. 8-2-3 Compressor motor speed control
(6) Louver control
The vertical air flow louvers are automatically set
to horizontal or cool memory position.
When temperature of indoor heat exchanger
becomes 5°C or lower by the prevent-freezing
control and the compressor is turned off, the
vertical air flow louvers close once and then
return to the position of previous time.
Zone
Operation stop zone
Normal down zone of motor speed
Slow down of motor speed
Keep zone : Motor speed is not changed.
Slow-up zone of motor speed
Normal operation zone
F
117
TD
(˚C)
112
108
105
98
E
D
C
B
A
Release of motor speed