Toshiba RAV-SM1400AT-E Outdoor Control, Requirement, Pulse Modulating Valve PMV control

9. OUTDOOR CONTROL

9-1. Outline of Main Controls

1.Pulse Modulating Valve (PMV) control

1)PMV is controlled with 50 to 500 pulses during operation, respectively.

2)In cooling operation, PMV is controlled with the temperature difference between TS sensor and TC sensor.

3)In heating operation, PMV is controlled with the temperature difference between TS sensor and TE sensor.

4)For the temperature difference in items 2) and 3), 1 to 5K is aimed as the target in both cooling and heating operations.

5)When the cycle excessively rose in both cooling and heating operations, PMV is controlled by TD sensor. The aimed value is usually 105°C for SM560 and 100°C for SM800, SM1100, SM1400 in both cooling and heating operations.

REQUIREMENT

A sensor trouble may cause a liquid back-flow or abnormal overheat resulting in excessive shortening of the compressor life. In a case of trouble on the compressor, be sure to check there is no error in the resistance value an the refrigerating cycle of each sensor after repair and then start the operation.

2. Discharge temperature release control

1) This function controls the operation frequency, that is, lowers the operation frequency when the dis-

TD [˚C]

	charge temperature has not lower or the discharge						Error stop ("P03" display with 4 times of error counts)
	temperature has rapidly risen during PMV control. It						a
	subdivides the frequency control up to a unit of						b	Frequency down
	0.6Hz to stabilize the cycle.
	2) When the discharge temperature is detected in an						c
	abnormal stop zone, the unit stops the compressor
								Frequency holding
	and restarts after 2 minutes 30 seconds. The error
	counter is cleared when it has continued the opera-						d
	tion for 10 minutes.
								Frequency slow-up
	If the abnormal stop zone has been detected by 4
								(Up to command)
	times without clearing of counter, an error ‘P03’ is
							e
	displayed.
								As command is
	* The cause is considered as excessively little amount
	of refrigerant, defective PMV, or clogging of cycle.
						[°C]		[A]
		a	b	c	d	e		Frequency down
	SM560	117	112	108	105	98
	SM800, 1100, 1400	111	106	100	95	90	I1	Hold
3.	Current release control						1–0.5	Hold
								Normal operation
	The output frequency and the output voltage are
	controlled by AC current value detected by T02 on the
	outdoor P.C. board so that input current of the inverter
	does not exceed the specified value.

Objective	SM560		SM800		SM1100		SM1400
model	COOL	HEAT	COOL	HEAT	COOL	HEAT	COOL	HEAT
I1 value [A]	9.22	11.93	12.00	13.43	18.90	19.65	19.65	19.65

* For the cooling only models, only COOL is objective.

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