Toshiba RAV-SM2804AT7Z Defrost control, Short interrupted operation preventive control

4.Defrost control

1)During heating operations, defrost operations are performed when the temperature from the TE sensor satisfies any of the conditions in the A to D zones.

2)During defrosting operations, defrost will be terminated if the temperature from the TE sensor continues at 12°C or higher for 3 seconds or if the temperature is 7°C ≤ TE < 12°C for 1 minute.

Furthermore the defrost operation will be terminated if defrosting operations have continued for 10 minutes even if TE sensor temperature is less than 7°C.

3)After defrost operations have been reset, the compressor restarts heating operations without stopping.

Start warming operation
0	10		15	39	45	55		90 [min.]
TE [˚C]
–2
–5
							A zone
–10
									D zone
						B zone
–18
		∗
						C zone

∗The minimum TE value during 10 and 15 minutes after starting heating operation is stored as TEO.

	When To is normal		When To is abnormal
A Zone	Status [(TEO-TE) – (ToO-To) ≥	3°C] continues for 20 seconds	Status [TEO- TE ≥	3°C] continues for 20 seconds
B Zone	Status [(TEO-TE) – (ToO-To) ≥	2°C] continues for 20 seconds	Status [TEO-TE ≥	2°C] continues for 20 seconds
C Zone		Status [TE ≤ 23°C] continues for 20 seconds
D Zone	When compressor operation status TE < 2°C is calculated for d minutes

4)The above time of d can be changed by selecting jumper [J805] or [J806]. (Setting at shipment; 90 minutes)

J805	J806	d
¡	¡	150 minutes
¡	×	90 minutes (Setting at shipment)
×	¡	60 minutes
×	×	30 minutes	¡ : Short-circuit, × : Open

5.Short interrupted operation preventive control

1)Even when a thermostat OFF signal is received from the indoor unit, the compressor may not stop during an 8 minute period after startup in order to protect the compressor.

This operation is not an error condition.

2)When operation is terminated by using a remote controller, operation will not continue.

6.Electrical current release control

An AC current detection value from T611 on the IPDU control board is used to suppress the revolution number of the compressor so that the input current of the inverter does not exceed a specified value.

A Zone	Normal operation.		Current (A)
D Zone	Maintain frequency of current operation.			B zone
B Zone	Reduce operating frequency.		l1
C Zone	Cease reduction of operating frequency
	and maintain frequency of current operation.
				D zone	C zone
			l1–0.5
	SM224 Type	SM280 Type
l1 value (A)	15.7	17.6		A zone

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