Toshiba RAV-SM1402UT-E Pulse Motor Valve P.M.V. control, Discharge temperature release control

Revised : Nov. 2006

9. CIRCUIT CONFIGURATION AND CONTROL SPECIFICATIONS

9-1. Indoor Control Circuit

9-1-1. Outline of Main Controls (This content is same 9-2-2. of Outdoor Content)

RAV-SM562AT-E, RAV-SM802AT-E, RAV-SM1102AT-E, RAV-SM1402AT-E

1.Pulse Motor Valve (P.M.V.) control

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

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

3)In heating operation, P.M.V. 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 SM562 and 100°C for SM802, SM1102, SM1402 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	TD [˚C]
1) This function controls the operation frequency, that
is, lowers the operation frequency when the dis-	Error stop ("P03" display with 4 times of error counts)

charge temperature has not lower or the discharge						a
temperature has rapidly risen during P.M.V. control.
							Frequency down
It subdivides the frequency control up to a unit of						b
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						d
the operation for 10 minutes.							Frequency slow-up
If the abnormal stop zone has been detected by 4						e	(Up to command)
times without clearing of counter, an error “P03” is							As command is
displayed.
* The cause is considered as excessively little							[A]
amount of refrigerant, defective PMV, or clogging
of cycle.							Frequency down
					[°C]
						I1
	a	b	c	d	e		Hold
SM562	117	107	103	100	93		Hold
SM802, 1102, 1402	111	106	100	95	90	1–0.5
							Normal operation

3. Current release control

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	SM562		SM802		SM1102		SM1402
model	COOL	HEAT	COOL	HEAT	COOL	HEAT	COOL	HEAT	* For the cooling only models,
I1 value [A]	10.1	12.0	12.2	14.0	18.9	19.7	19.7	19.7
									only COOL is objective.

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