Compressor Motor Speed Control - Toshiba RAS-M10NKV-E Service Manual

(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, when 1 unit only operates, the
compressor motor speed is limited as described
in the table below.
Table 6-2-1
Air flow M10
rate (rps)
HIGH 32
M+ 29
MED 24
L 20
L– 20
UL 20
SUL 20
(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
120
E
115
D
111
C
108
B
101
A
M13 M16
(rps) (rps)
48 54
42 46
28 38
20 30
20 30
20 20
20 20
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. 6-2-4 Compressor motor speed control
– 13 –
(7) Discharge temperature control
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 101°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 101°C or higher,
operating motor speed is slowly up.
3) Control 3 (C zone) : Keep zone
When TD detect value is 108°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 111°C or higher,
operating motor speed is slowly down.
5) Control 5 (E zone) : Normal down of motor
speed
When TD detect value is 115°C or higher,
operating motor speed is down.
6) Control 6 (F zone) : Operation stop zone
If TD detect value exceeds 120°C during
operation, stop the operation immediately.
Then, restart the operation when TD detect
value becomes 108°C or lower.
FILE NO. SVM-05019
Release of motor speed