Toshiba RAS-10SAVP-E, RAS-B13SKVP-E, RAS-B10SKVP-E Tightening Connection, Use a vacuum pump, 65

Ø12.7 mm

50 to 62 (5.0 to 6.2 kgf•m)

Ø9.52 mm

33 to 42 (3.3 to 4.2 kgf•m)

Ø6.35 mm

Tightening torque

14 to 18 (1.4 to 1.8 kgf•m)

Outer dia. of copper pipe

• Tightening torque for connection of flare pipe

The pressure of R410A is higher than R22. (Approx. 1.6 times.) Therefore securely tighten the flare pipes which connect the outdoor unit and the indoor unit with the specified tightening torque using a torque wrench.

If any flare pipe is

Flare at

incorrectly connected,indoor unit

it may cause not onlyside a gas leakage but also trouble in the

refrigeration cycle.

Flare at

outdoor unit side

Fig. 10-4-8

10-4-4. Evacuating

After the piping has been connected to the indoor unit, perform the air purge.

AIR PURGE

Evacuate the air in the connecting pipes and in the indoor unit using a vacuum pump.

Do not use the refrigerant in the outdoor unit. For details, see the vacuum pump manual.

Fig. 10-4-7

CAUTION

Tightening Connection

Align the centers of the connecting pipes and tighten the flare nut as much as possible with your fingers. Then tighten the nut with a wrench and torque wrench as shown in the figure.

Half union	Flare nut
Externally	Internally
threaded side	threaded side
Use a wrench	Use a torque wrench
to secure.	to tighten.

•Do not apply excessive force. Otherwise, the nut may break.

(Unit : N·m)

Use a vacuum pump

Be sure to use a vacuum pump with counter-flow prevention function so that oil inside the pump does not flow back into the air conditioner pipes when the pump stops. (If oil inside the vacuum pump enters into the air conditioner circuit which uses R410A, trouble with the refrigeration system may develop.)

1.Connect the charge hose from the manifold valve to the service port of the gas side packed valve.

2.Connect the charge hose to the port of the vacuum pump.

3.Open fully the low pressure side handle of the gauge manifold valve.

4.Operate the vacuum pump to begin evacuating. Perform evacuating for about 15 minutes if the piping length is 20 meters (15 minutes for 20 meters) (assuming a pump capacity of 27 liters per minute).

Confirm that the compound pressure gauge reading is –101 kPa (–76 cmHg).

5.Close the low pressure valve handle of gauge manifold.

6.Open fully the valve stem of the packed valves (both sides of Gas and Liquid).

7.Remove the charging hose from the service port.

8.Securely tighten the caps on the packed valves.

Compound Pressure gauge pressure

gauge

-101kPa (-76cmHg)

Handle Lo

Charge hose (For R410A only)

Connecting pipe

Manifold valve

Handle Hi

(Keep full closed)

Charge hose (For R410A only)

Vacuum pump adapter for counter-flow prevention

(For R410A only)

Vacuum pump

Packed valve at liquid side Packed valve at gas side

Service port

(Valve core (Setting pin))

Fig. 10-4-9

CAUTION

•IMPORTANT POINTS FOR PIPING WORK

1.Prevent dust and moisture from entering the pipes.

2.Tighten connections carefully (between pipes and unit).

3.Evacuate the air in the connecting pipes using a VACUUM PUMP.

4.Check for gas leaks at all connections.

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