Toshiba RAS-M13EKCVP-E, RAS-M18EACV-E Condition, Defrost operation, Finish of defrost operation

Item	Operation flow and applicable data, etc.		Description
7. Winding/Coil	When the outdoor temperature is low, the windings/coils		Winding/Coil heating is performed
heating control	are heated to ensure compressor reliability.		when the following conditions are
			met.
	Outdoor temperature To	Winding/Coil	Condition 1 :
			When the discharge sensor tempera-
		heating amount
			ture (Td) is less than 30°C.
	–1˚C	OFF	Condition 2 :
			When 2 hours or more have elapsed
	–3˚C		after cooling, dry or heating opera-
		20W	tion stops.
			Condition 3 :
			When the outdoor sensor tempera-
			ture (To) is as shown in the left
			figure.

8. Defrost control	(This function removes frost adhered to the outdoor heat							The necessity of defrost operation is
(Only in heating	exchanger.)							detected by the outdoor heat
operation)	The temperature sensor of the outdoor heat exchanger							exchanger temperature. The condi-
								tions to detect the necessity of
	(Te sensor) judges the frosting status of the outdoor heat
								defrost operation differ in A, B, or C
	exchanger and the defrost operation is performed with
								zone each. (Table 1)
	4-way valve reverse defrost system.
								<Defrost operation>
								• Defrost operation in A to C zones
								1) Stop operation of the compressor
								for 20 seconds.
		Start of heating operation						2) Invert (ON) 4-way valve 10
								seconds after stop of the com-
	temperature
							Operation time	pressor.
		0’ 10’ 15’		29’	34’
								3) The outdoor fan stops at the same
							(Minute)
								time when the compressor stops.
		–4˚C						4) When temperature of the indoor
	exchanger							heat exchanger becomes 38°C or
							C zone
		–6˚C						lower, stop the indoor fan.
						A zone		<Finish of defrost operation>
	heat							• Returning conditions from defrost
		–25˚C						operation to heating operation
	Outdoor
						B zone		1) Temperature of outdoor heat
			*					exchanger rises to +8°C or higher.
								2) Temperature of outdoor heat
	* The minimum value of Te sensor 10 to 15 minutes after							exchanger is kept at +5°C or
								higher for 80 seconds.
	start of operation is stored in memory as Te0.
								3) Defrost operation continues for
								15 minutes.
				Table 1				<Returning from defrost operation>
								1) Stop operation of the compressor
			When Te0 - TE ≥ 2.5 continued for 2 minutes in
		A zone						for approx. 50 seconds.
			A zone, defrost operation starts.
								2) Invert (OFF) 4-way valve approx.
			When the operation continued for 2 minutes in
		B zone						40 seconds after stop of the
			B zone, defrost operation starts.					compressor.
		C zone	When Te0 - TE ≥ 3 continued for 2 minutes in C					3) The outdoor fan starts rotating at
			zone, defrost operation starts.					the same time when the compres-
								sor starts.

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