Toshiba RAS-13YKV-E, RAS-10YKV-E, RAS-10YAV-E, RAS-13YAV-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, 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

(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.

(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.

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	Slow-up zone of motor speed

A Normal operation zone

Fig. 8-2-3 Compressor motor speed control

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