Toshiba 13J2KCVRG-T Panduan Instalasi - Halaman 12

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Outer dia. of copper pipe

Ø6.35 mm

Ø9.52 mm

Ø12.70 mm

• Tightening torque of flare pipe connections

The operating pressure of R32

is higher than that of R22 (approx.

1.6 times). It is therefore necessary

to firmly tighten 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 damage to the

refrigeration cycle.

Evacuating

After the piping has been connected to the indoor unit, you can perform the

air purge together at once.

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 manual of the vacuum pump.

Using a vacuum pump

Be sure to use a vacuum pump with counter-flow prevention function so that

inside oil of the pump does not flow backward into pipes of the air conditioner

when the pump stops.

(If oil inside of the vacuum pump enters the air conditioner, which use R32,

refrigeration cycle trouble may result.)

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

packed valve at gas side.

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 start 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) Then confirm that the

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

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

6. Open fully the valve stem of the packed valves (both gas and liquid sides).

7. Remove the charging hose from the service port.

8. Securely tighten the caps on the packed valves.

Compound pressure gauge

‒101 kPa

(‒76 cmHg)

Handle Lo

Charge hose

Connecting pipe

Packed valve at gas side

Service port (Valve core (Setting pin))

Packed valve at liquid side

(Unit : N·m)

Tightening torque

16 to 18 (1.6 to 1.8 kgf·m)

30 to 42 (3.0 to 4.2 kgf·m)

50 to 62 (5.0 to 6.2 kgf·m)

Flare at

indoor unit side

Flare at

outdoor unit side

Pressure gauge

Manifold valve

Handle Hi

(Keep full closed)

Charge hose

Vacuum pump adapter for

counter-flow prevention

Vacuum

pump

CAUTION

• KEEP IMPORTANT 6 POINTS FOR PIPING WORK.

(1) Take away dust and moisture (inside of the connecting pipes).

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

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

(4) Check gas leak (connected points).

(5) Be sure to fully open the packed valves before operation.

(6) Reusable mechanical connectors and flared joints are not allowed

indoors. When mechanical connectors are reused indoors, sealing

parts shall be renewed.

When flared joints are reused indoors, the flare part shall be

refabricated.

Packed valve handling precautions

• Open the valve stem all the way out, but do not try to open it beyond the

stopper.

Pipe size of Packed Valve

12.70 mm and smallers

15.88 mm

• Securely tighten the valve cap with torque in the following table:

Cap

Valve Rod Cap

Service Port Cap

Size of Hexagon wrench

A = 4 mm

A = 5 mm

Cap Size (H)

Torque

14~18 N·m

H17 - H19

(1.4 to 1.8 kgf·m)

33~42 N·m

H22 - H30

(3.3 to 4.2 kgf·m)

8~12 N·m

H14

(0.8 to 1.2 kgf·m)

14~18 N·m

H17

(1.4 to 1.8 kgf·m)

Hexagon wrench

is required

Valve Rod Cap