Toshiba RAS-10YAV-E Service Manual page 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
RAS-10YKV-E
Air flow rate
(rps)
HIGH 56
M+ 49
MED. 43
L–, L 36
UL, SUL 30
(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.
TD
Zone
(˚C)
F
117
E
112
D
108
C
105
B
98
A
RAS-13YKV-E
(rps)
85
71
57
44
30
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
Fig. 8-2-3 Compressor motor speed control
– 28 –
(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.
Release of motor speed