Toshiba RAV-SM2244AT7Z Allowable pipe length m, Total length Branch piping Indoor-outdoor H

Digital Inverter

„Refrigerant Pipe Length

Simultaneous twin, triple

			Allowable pipe length (m)							Height difference (m)
Outdoor	Total length			Branch piping		Branch piping			Indoor-outdoor H
	•	1 +	2	•	2	•	3 –	2			Indoor-indoor
unit	•	1 +	3	•	3	•	4 –	2	Indoor unit:	Outdoor unit:
											(∍h)
	•	1 +	4	•	4	•	4 –	3	Upper	Upper
	Maximum			Maximum		Maximum
SM2244			70		20			10	30	30	0.5
SM2804			70		20			10	30	30	0.5
Outdoor					Pipe diameter (mm)						Number of bent
				Main pipe					Branch piping
unit											portions
			Gas side		Liquid side			Gas side		Liquid side
SM2244			Ø28.6		Ø12.7			Ø15.9		Ø9.5	10 or less
SM2804			Ø28.6		Ø12.7			Ø15.9		Ø9.5	10 or less

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

Vacuum pump

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

manifold valve is closed completely.

L

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.

L

Open Handle Low fully.

L

Turn ON the vacuum pump. (*1)

L

–

Figure of Simultaneous twin

Indoor Unit

Indoor Unit

Outdoor Unit

2 3 H

1

Figure of Simultaneous triple

	Indoor Unit
Indoor Unit	Indoor Unit
Outdoor Unit	4
2	3
	1

H

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.)

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

L

Retighten the flare nut.

L

Execute vacuuming until the compound pressure gauge

indicates –101 kPa (–76 cmHg). (*1)

L

103

Compound pressure gauge

Pressure gauge

Close Handle Low completely.

–

Simultaneous double twin

Allowable pipe length (m)

Height difference (m)

Total length

Branch

Branch

Branch piping

Indoor-outdoor H

• (

4 +

2) – (

5 +

2)

piping

piping

Outdoor

•

1 +

2 +

4

• (

4 +

2) – (

6 +

3)

•

4

•

4 +

2

Indoor-

unit

•

1 +

2 +

5

•

5

•

5 +

2

• (

4 +

2) – (

7 +

3)

Indoor

Outdoor

indoor

•

1 +

3 +

6

•

6

•

6 +

3

• (

5 +

2) – (

6 +

3)

unit:

unit:

(∍h)

•

1 +

3 +

7

•

7

•

7 +

3

• (

5 +

2) – (

7 +

3)

Upper

Upper

Maximum

Maximum

Maximum

• (

6 +

3) – (

7 +

3)

Maximum

SM2244

70

15

20

6

30

30

0.5

SM2804

70

15

20

6

30

30

0.5

Outdoor

Pipe diameter (mm)

Number of bent

–101 kPa (–76 cmHg)

Handle Low

Charge hose (For R410A only)

Charge port (Valve core (Setting pin))

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

L

Turn OFF the vacuum pump.

L

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.

L

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

side, then gas side)

L

Disconnect the charge hose from the charge port.

L

unit		Main pipe				Branch piping					portions
	Gas side	Liquid side		Gas side				Liquid side
SM2244	Ø28.6	Ø12.7		2,	3: Ø15.9			2,	3: Ø9.5		10 or less
			4,	5,	6,	7: Ø12.7	4,	5,	6,	7: Ø6.4
SM2804	Ø28.6	Ø12.7		2 to	7: Ø15.9			2 to	7: Ø9.5		10 or less
		Figure of Simultaneous double twin					Indoor Unit
			Indoor Unit			Indoor Unit
		Indoor Unit
	Outdoor Unit
		4		5		6			7
										H
			2			3
			1

Packed valve at gas side

	Tighten the valve and caps of the charge port securely.
*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
*2	of the oil gauge.
	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 13 14 EN