(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
Air flow rate |
| ||
(rps) | (rps) | ||
| |||
|
|
| |
HIGH | 56 | 85 | |
|
|
| |
M+ | 49 | 71 | |
|
|
| |
MED. | 43 | 57 | |
|
|
| |
36 | 44 | ||
|
|
| |
UL, SUL | 30 | 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
(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) :
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.
TD (˚C)
117
112
108
105
98
Zone |
|
F | Operation stop zone |
|
|
E | Normal down zone of motor speed |
| Release of motor speed |
| |
D | Slow down of motor speed |
|
|
C | Keep zone : Motor speed is not changed. |
|
|
B |
A | Normal operation zone |
Fig. 8-2-3 Compressor motor speed control
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