Toshiba RAV-SM800XT-E, RAV-SM560XT-E service manual Tightening connection

<Tightening connection>

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

CAUTION

•Do not apply excess torque. Otherwise, the nut may crack depending on the conditions.

(Unit : N•m)

9-7-3. Pipe Shield for Flare Nut Connection

Joints in liquid and gas pipes of the indoor unit should be insulated with an attached Pipe shield $.

<How to install the pipe shield>

1.Cut the Pipe shield $ to appropriate length.

2.Set the Pipe shield $.

3.In case of a ceiling installation, orient the slit at the top of the pipe.

4.Fix the Pipe shield $ with vinyl tape.

Outer diam. of copper pipe	Tightening torque
6.35 mm (diam.)	14 to 18 (1.4 to 1.8 kgf•m)
9.52 mm (diam.)	33 to 42 (3.3 to 4.2 kgf•m)
12.7 mm (diam.)	50 to 62 (5.0 to 6.2 kgf•m)

Vinyl tape

Slit

15.9 mm (diam.) 63 to 77 (6.3 to 7.7 kgf•m)

•Tightening torque of flare pipe connections

Pressure of R410A becomes higher than that of R22. (Approx. 1.6 times) Therefore, using a torque wrench, tighten firmly the flare pipe connecting sections which connect the indoor and outdoor units up to the specified tightening torque.

Incorrect connections may cause not only a gas leakage, but also a trouble of the refrigeration cycle or compressor damage.

Flare at

indoor unit side

	Flare at
	outdoor unit side
	Fig. 9-7-3
Half union	Flare nut
Externally	Internally
threaded side	threaded side
Use a wrench to secure.	Use a torque wrench to tighten.

Fig. 9-7-4

$Pipe shield

Fig. 9-7-5

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