Operation Manual

ManualsBrandsToshiba ManualsAir ConditioningRAS-10YK-HX

– 30 –

8-5-1. Refrigerant Piping Connection

(1) Cut the pipe with a pipe cutter.

90˚

Obliquity

Roughness

Warp

Fig. 8-5-2

(2) Insert a flare nut into the pipe, and flare the pipe.

Outer

dia.

6,35mm

9,52mm

A (mm) R22/R410A

Imperial Rigid

1,0 ~ 1,5/ 0,5 ~ 1,0/

1,5 ~ 2,0 1,0 ~ 1,5

1,0 ~ 1,5/ 0,5 ~ 1,0/

1,5 ~ 2,0 1,0 ~ 1,5

Die Pipe

Fig. 8-5-3

Fig. 8-5-4

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 installation

conditions.

Half union or packed valve

Flare nut

Externally

threaded

side

Internally

threaded

side

Use a wrench

to secure.

Use a torque wrench

to tighten.

8-5-2. Vacuum Pumping

INFORMATION

In order to prevent any other refrigerant from being

charged accidentally, each port of the manifold has

been changed in shape.

Differences in Port Size between

Conventional R22 and R410A

Outer dia.

6,35mm

9,52mm

Tightening touque

N•m (kgf•m)

16 ~ 18 (1,6 ~ 1,8)

30 ~ 42 (3,0 ~ 4,2)

Port

size

Manifold for R22 Manifold for R410A

7/16 UNF 1/2 UNF

20 threads per inch 20 threads per inch

AIR PURGE

Evacuate the air in the connecting pipes and in

the indoor unit using vacuum pump.

Do not use the refrigerant in the outdoor unit.

For details, see the manual of vacuum pump.

(1) Connect the charge hose (A) from the manifold

valve to the charge inlet of the gas side packed

valve.

(2) Connect the charge hose (B) to the port of

vacuum pump.

(3) Open fully the low pressure side handle of the

manifold valve.

(4) Operate the vacuum pump.

(5) Close the low pressure side handle of manifold

valve after vacuumizing and stop the vacuum

pump.

Continue vacuumizing more than 15 minutes and

check the pressure gage indicates –0,1MPa

(–76 cmHg).

(6) Open the stems of packed valves A and B all the

way.

(7) Securely tighten the stem cap to each of the

packed valve stems.