Toshiba RAV-SM2804AT8-E, RAV-SM2804AT8ZG-E, RAV-SM2244AT8ZG-E, RAV-SM2804AT8Z-E, RAV-SM2244AT7ZG 104

– 104 –

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„How to Open the Valve

Open or close the valve.

Liquid side

Open the valve with a 4 mm hexagon wrench.

Gas side

Valve unit

Using a minus screwdriver, turn it counterclockwise by 90° until it hits the stopper. (Full open)

Charge port

Flare nut

Handle position

Closed completely Opened fully

Stopper pin

„Insulating the Pipes

•The temperatures at both the liquid side and gas side will be low during cooling so in order to prevent condensation, be sure to insulate the pipes at both of these sides.

•Insulate the pipes separately for the liquid side and gas side.

•Insulate the branch pipes by following the instructions in the installation manual provided with the branch pipe kit.

•Use the insulating material provided as an accessory to insulate the Ø19.1 mm pipe at the gas side.

•Seal the area where the Ø19.1 mm pipe and Ø22.2 to Ø28.6 mm pipe are connected so that no gaps are left.

REQUIREMENT

Be sure to use an insulating material which can withstand temperatures above 120°C for the gas side pipe since this pipe will become very hot during heating operations.

„Replenishing Refrigerant

This model is a 30 m chargeless type that does not need to have its refrigerant replenished for refrigerant pipes up to

30 m. When a refrigerant pipe longer than 30 m is used, add the specified amount of refrigerant.

Refrigerant replenishing procedure

1.	After vacuuming the refrigerant pipe, close the valves
	and then charge the refrigerant while the air conditioner
	is not working.
2.	When the refrigerant cannot be charged to the specified

Digital Inverter

Adding additional refrigerant

Figure of Simultaneous twin		Figure of Simultaneous triple
	Indoor Unit		Indoor Unit
		Indoor Unit	Indoor Unit
Indoor Unit
Outdoor Unit		Outdoor Unit	4
2	3	2	3
	1
			1

Figure of Simultaneous double twin

		Indoor Unit		Indoor Unit	Indoor Unit
	Indoor Unit
Outdoor Unit	4		5	6	7
		2		3
		1
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
* 1 to 7 are the lengths of the pipes shown in the figures above (unit: m).
Simultaneous twin
Diameter of connecting pipe	Amount of additional			Amount of additional refrigerant (g) =
	refrigerant per meter

Main stopper

Movable part of valve (Stem)

amount, charge the required amount of refrigerant from

the charge port of the valve on the gas side during

	(liquid side)		(g/m)	Amount of refrigerant added for main pipe +
1	2	3		amount of refrigerant added for branch piping
			Δ	Ε

•While the valve is fully opened, after the screwdriver has reached the stopper, do not apply torque exceeding

5 N•m. Applying excessive torque may damage the valve.

Valve handling precautions

•Open the valve stem until it strikes the stopper. It is unnecessary to apply further force.

•Securely tighten the cap with a torque wrench.

Cap tightening torque

	Ø12.7 mm	50 to 62 N•m
		(5.0 to 6.2 kgf•m)
Valve size
	Ø19.1 mm	20 to 25 N•m
		(2.0 to 2.5 kgf•m)
Charge port		14 to 18 N•m
		(1.4 to 1.8 kgf•m)

cooling.

Requirement for replenishing refrigerant

Replenish liquid refrigerant.

When gaseous refrigerant is replenished, the refrigerant composition varies, which disables normal operation.

Ø12.7	Ø9.5	Ø9.5	80		40		Δ υ ( 1 – 28) + Ευ (		2 + 3 – 4)
Simultaneous triple
					Amount of additional		Amount of additional refrigerant (g) =
Diameter of connecting pipe (liquid side)					refrigerant per meter		Amount of refrigerant added for main pipe +
					(g/m)		amount of refrigerant added for branch
1	2	3	4		Δ	Ε		piping
Ø12.7	Ø9.5	Ø9.5	Ø9.5		80	40	Δ υ ( 1 – 28) + Ευ ( 2 + 3 + 4 – 6)
Simultaneous double twin
	Diameter of connecting pipe			Amount of additional			Amount of additional refrigerant (g) =
Outdoor		(liquid side)		refrigerant per meter (g/m)			Amount of refrigerant added for main pipe
							+ amount of refrigerant added for first
unit
	1	2, 3	4 to 7	Δ	Ε	ϑ	branch piping + amount of refrigerant
							added for second branch piping
SM2244	Ø12.7	Ø9.5	Ø6.4	80	40	20	Δ υ (	1 – 28) + Ευ (		2 +	3 – 4) +
								ϑυ ( 4 +	5 +	6 +	7)
SM2804	Ø12.7	Ø9.5	Ø9.5	80	40	40	Δ υ (	1 – 28) + Ευ (		2 +	3 – 4) +
								ϑυ ( 4 +	5 +	6 +	7)

		16	EN
EN	15