Toshiba RAV-SP1104AT8Z-E Air Purging, Refrigerant Pipe Length, Airtight test, Air Purge, EN-18

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Super Digital Inverter

￿Refrigerant Pipe Length

Single

Allowable pipe length (m)	Height difference (Indoor-outdoor H) (m)
Total length L	Indoor unit: Upper	Outdoor unit: Lower
75	30	30
Pipe diameter (mm)		Number of bent portions
Gas side	Liquid side	10 or less
Ø15.9	Ø9.5

Simultaneous twin, triple

				Allowable pipe length (m)						Height difference (m)
		Total length			Distributed		Distributed			Indoor-outdoor H
					pipes		pipes
		•	1 +	2
System	Model				•	2	•	3 –	2			Indoor-indoor
		•	1 +	3						Indoor unit:	Outdoor unit:
					•	3	•	4 –	2			( h)
		•	1 +	4						Upper	Upper
					•	4	•	4 –	3
		Maximum
					Maximum		Maximum
TWIN	SP110			50		15			10	30	30	0.5
	SP140, SP160			50		15			10	30	30	0.5
TRIPLE	SP160 only			50		15			10	30	30	0.5
						Pipe diameter (mm)

Super Digital Inverter

6 AIR PURGING

￿Airtight test

Before starting an airtight test, further tighten the spindle valves on the gas side and liquid side.

Pressurize the pipe with nitrogen gas charged from the service port to the design pressure (4.15 MPa) to conduct the airtight test.

After the airtight test is completed, evacuate the nitrogen gas.

￿Air Purge

With respect to the preservation of the terrestrial

environment, adopt “Vacuum pump” to purge air (Evacuate air in the connecting pipes) when installing the unit.

•Do not discharge the refrigerant gas to the atmosphere to preserve the terrestrial environment.

•Use a vacuum pump to discharge the air (nitrogen, etc.)

that remains in the set. If air remains, the capacity may decrease.

For the vacuum pump, be sure to use one with a backflow preventer so that the oil in the pump does not backflow into the pipe of the air conditioner when the pump stops.

(If oil in the vacuum pump is put in an air conditioner

including R410A, it may cause trouble with the refrigeration cycle.)

Vacuum pump

As shown in the figure, connect the charge hose after the

manifold valve is closed completely.

↓

Attach the connecting port of the charge hose with a projection to push the valve core (setting pin) to the charge port of the set.

↓

Open Handle Low fully.

↓

Turn ON the vacuum pump. (*1)

↓

Loosen the flare nut of the packed valve (Gas side) a little to check that the air passes through. (*2)

↓

Retighten the flare nut.

↓

Execute vacuuming until the compound pressure gauge

indicates –101 kPa (–76 cmHg). (*1)

↓

110 –

System		Model	Main pipe		Branching pipe			Number of bent
								portions
			Gas side	Liquid side	Gas side		Liquid side
TWIN		SP110	Ø15.9	Ø9.5	Ø12.7		Ø6.4	10 or less
		SP140, SP160	Ø15.9	Ø9.5	Ø15.9		Ø9.5	10 or less
TRIPLE		SP160 only	Ø15.9	Ø9.5	Ø12.7		Ø6.4	10 or less
Figure of Single			Figure of Simultaneous twin			Figure of Simultaneous triple
	Indoor Unit			Indoor Unit			Indoor Unit	Indoor Unit

Indoor Unit

Indoor Unit

Compound pressure gauge

–101 kPa

(–76 cmHg)

Handle Low

Charge hose

(For R410A only)

Charge port

Pressure gauge

Gauge manifold valve

Handle High

(Keep fully closed)

Charge hose

(For R410A only)

Vacuum pump adapter for counter- flow prevention (For R410A only)

Vacuum

pump

Close Handle Low completely.

↓

Turn OFF the vacuum pump.

↓

Leave the vacuum pump as it is for 1 or 2 minutes, and check that the indicator of the compound pressure gauge does not return.

↓

Open the valve stem or valve handle fully. (First, at liquid

side, then gas side)

↓

Disconnect the charge hose from the charge port.

Distributor

4

(Valve core (Setting pin))

↓

				Out	2	3
L	H	2	3	H			H

Packed valve at gas side

Tighten the valve and caps of the charge port securely.

1

Distributor

1

*1	Use the vacuum pump, vacuum pump adapter, and gauge
	manifold correctly referring to the manuals supplied with each
	tool before using them.
	Check that the vacuum pump oil is filled up to the specified line
	of the oil gauge.
*2	When air is not charged, check again whether the connecting

port of the discharge hose, which has a projection to push the valve core, is firmly connected to the charge port.

EN-18 18 19 19-EN