Manual Carrier 38VYX025-R (page 7 of 45) (All languages)

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GB 3

Refrigerant Piping Connection 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.

Pressure gauge

Manifold valve

–101 kPa

(–76 cmHg)

Handle Lo

Connecting

pipe

Compound pressure gauge

Vacuum

pump

Handle Hi

(Keep full closed)

Charge hose

(For R410A only)

Charge hose

(For R410A only)

Vacuum pump adapter for

counter-flow prevention

(For R410A only)

Packed valve at gas side

Service port (Valve core (Setting pin))

Packed valve at liquid side

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 R410A, 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.

CAUTION

• KEEP IMPORTANT 4 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).

Flaring

Outer dia.

R410A tool used Conventional tool used

of copper pipe

6.35 0 to 0.5 1.0 to 1.5

9.52 0 to 0.5 1.0 to 1.5

Imperial (wing nut type)

Obliquity

Roughness Warp

Die

Pipe

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.

Outer dia. of copper pipe R410A

6.35 1.5 to 2.0

9.52 1.5 to 2.0

• Tightening torque of flare pipe connections

The operating pressure of R410A

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.

(Unit : N·m)

Outer dia. of copper pipe Tightening torque

∅6.35 mm 16 to 18 (1.6 to 1.8 kgf·m)

∅9.52 mm 30 to 42 (3.0 to 4.2 kgf·m)

Use a wrench to secure. Use a torque wrench to tighten.

Incused line

Flare nutHalf union

Internally

threaded side

Externally

threaded side

CAUTION

Do not apply excess torque. Otherwise, the nut may crack

depending on the conditions.

1.Cut the pipe with a pipe cutter.

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

• Projection margin in flaring : A (Unit : mm)

Rigid (clutch type)

Shaping pipes

1.How to shape the pipes

Shape the pipes along the

incused line on the outdoor unit.

2.How to fit position of the pipes

Put the edges of the pipes to the

place with a distance of 85 mm

from the incused line.

Flare at

indoor unit side

Flare at

outdoor unit side

GB - 3

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Carrier 38VYX025-R Manual

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