Description of Operation Circuit | Toshiba RAS-13UKV-E2 specification

8-2. Description of Operation Circuit

•Turning [ON] the breaker flashes the operation lamp. (1Hz)

This is the display of power-ON (or notification of power failure).

•When pushing [START/STOP] button of the remote control, receive sound is issued from the main unit, and the next operations are performed together with opening the vertical air flow louvers.

8-2-1. Cooling operation

(The Remote Control MODE Button is Set to the COOL Position)

•Once the setting is made, the operation mode is memorized in the microcomputer so that the same operation can be effected thereafter simply by pushing [START/STOP] button.

•A cooling operation signal is transmitted to outdoor unit.

•The outdoor unit controls the outdoor fan relay R01, R02 and R03, and the compressor motor speed according to the operation command signal sent from the indoor unit.

•When [FAN] button is set to AUTO, the indoor fan motor operates as shown in Fig. 8-2-1. When

[FAN] button is set to LOW , LOW+ ,

MED , MED+ , HIGH , the motor operates with a constant air flow.

temp.)	° C
	° C
	+3
	+3
(Set−	+2.5				M+
(Set−				*1

temp.)	+2
temp.)	+1.5			*1
				*1

(Room	+1			*1
(Room					L

	+0.5
Set		0
Set					In normal
temp.					In normal
		−	0.5		operation
		−	0.5

NOTE :

*1: Calculated from difference in motor speed of M+ and L, and controlled.

Fig. 8-2-1 Setting of air flow [Fan AUTO]

FILE NO. SVM-03008

(1)Cooling capacity control

•The cooling capacity and room temperature are controller by changing the compressor motor speed according to both the difference between the temperature detected by the room

temperature sensor and the temperature set by

TEMP button and also any change in room temperature.

•When compressor has been activated or reactivated, it operates with Max.41 rps for 2 minutes, with Max.91 rps from 2 minutes to 3 minutes, and with Max.88 rps after 3 minutes passed.

•When room temperature is lower than set temperature, indoor fan motor is operated at fan speed L as shown in Fig. 8-2-1 while the outdoor unit stops.

(2)Prevent-freezing control

If temperature of indoor heat exchanger detected by the indoor heat exchanger sensor is 5° C lower, compressor motor speed is gradually lowered to

prevent freezing of the indoor heat exchanger. If temperature is 7° C or higher, return the operation to the above item (1).

(3)Current release control

The input current of compressor and outdoor fan motor (Precisely inverter main circuit control section) which occupy most of air conditioner input is detected by the outdoor current sensor, and compressor motor speed is gradually lowered so that current value does not exceed 9.0A if current value exceeds 9.0A. When the current value lowers to 8.5A, return the operation to the above item (1).

(A)		Comp. motor
(A)		speed down
value	9.0	speed down
	9.0

Current		Comp. motor
	8.5	speed keep
	8.5

		Normal control
		Fig. 8-2-2

– 26 –

RAS-13UAV-E2, RAS-13UKV-E2 specifications

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