Chariot Carriers Merci Installation Manual download pdf (Page 34)

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66-EN65-EN

Refrigerant piping

Optional installation parts

(Locally procured)

Refrigerant piping connection

CAUTION

Take note of these 4 important points below for

piping work.

1. Keep dust and moisture away from inside the

connecting pipes.

2. Tightly connect the connection between pipes and

the unit.

3. Evacuate the air in the connecting pipes using a

VACUUM PUMP.

4. Check for gas leaks at connection points.

Piping connection

(Unit: mm)

Flaring

Cut the pipe with a pipe cutter.

Be sure to remove burrs that may cause a gas

leak.

2 Insert a flare nut into the pipe, and then flare

the pipe.

Use the flare nuts supplied with the air conditioner

or those for R410A.

Insert a flare nut into the pipe, and flare the pipe.

As the flaring sizes of R410A differ from those of

refrigerant R22, the flare tools newly

manufactured for R410A are recommended.

However, the conventional tools can be used by

adjusting the projection margin of the copper pipe.

Projection margin in flaring: B (Unit: mm)

Rigid (Clutch type)

Flaring dia. size: A (Unit: mm)

* In case of flaring for R410A with t

he conventional

flare tool, pull the tool out approx. 0.5 mm more than

that for R22 to adjust it to the specified flare size.

The copper pipe gauge is useful for adjusting the

projection margin size.

Parts name Q’ty

Refrigerant piping

Liquid side: Ø6.4, 9.5 mm

Gas side: Ø12.7, 15.9 mm

One each

Pipe insulating material

(polyethylene foam, 6 mm thick)

C hcae enOepat CVP ,yttuP

RAV-

Liquid side Gas side

Outer

diameter

Thickness

Outer

diameter

Thickness

SM56 Ø6.4 0.8 Ø12.7 0.8

SM80 Ø9.5 0.8 Ø15.9 1.0

Outer dia. of

copper pipe

R410A tool used

Conventional

tool used

R410A R410A

6.4

0 to 0.5 1.0 to 1.5

9.5

12.7

15.9

Outer dia. of copper pipe A

–0.4

9.94.6

2.315.9

6.617.21

7.919.51

Tightening of connecting part

Align the centers of the connecting pipes

and fully tighten the flare nut with your

fingers. Then fix the nut with a wrench as

shown in the figure and tighten it with a

torque wrench.

2 As shown in the figure, be sure to use two

wrenches to loosen or tighten the flare nut of

the valve on the gas side. If you use a single

crescent, the flare nut cannot be tightened to

the required tightening torque.

On the other hand, use a single crescent to loosen

or tighten the flare nut of the valve on the liquid

side.

(Unit: Nm)

CAUTION

 Do not put the crescent wrench on the cap.

The valve may break.

 If applying excessive torque, the nut may break

according to some installation conditions.

 After the installation work, be sure to check for gas

leaks of the pipe connections with nitrogen.

 Pressure of R410A is higher than that of R22

(Approx. 1.6 times).

Therefore, using a torque wrench, tighten the flare

pipe connecting sections that connect the indoor /

outdoor units at the specified tightening torque.

Incomplete connections may cause not only a gas

leak, but also trouble with the refrigeration cycle.

Outer dia. of copper pipe Tightening torque

6.4 mm (dia.) 14 to 18 (1.4 to 1.8 kgIm)

9.5 mm (dia.) 34 to 42 (3.4 to 4.2 kgIm)

12.7 mm (dia.) 49 to 61 (4.9 to 6.1 kgfm)

15.9 mm (dia.) 63 to

77 (6.3 to 7.7 kgfm)

Half union or packed valve Flare nut

Internally

threaded side

Externally

threaded side

Fix with wrench.

Tighten with torque

wrench.

Wrench for fixing

Flare nut

Wrench for work

Cap

Tightened

Loosened

Valve at gas side

Do not apply refrigerant oil to the flared surface.

In correct

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Chariot Carriers Merci Installation Manual Page 34

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