Toshiba 22SKV Manuel d'installation - Page 9

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Refrigerant Piping Connection

Flaring

1. Cut the pipe with a pipe cutter.

2. Insert a ﬂ are nut into the pipe and ﬂ are the pipe.

• Projection margin in ﬂ aring : A (Unit : mm)

Rigid (clutch type)

Outer dia.

R410A tool used

of copper pipe

6.35 mm

12.70 mm

Imperial (wing nut type)

Outer dia. of copper pipe

Die

Pipe

Tightening connection

Align the centers of the connecting pipes and tighten the ﬂ are nut as far as

possible with your ﬁ ngers. Then tighten the nut with a spanner and torque

wrench as shown in the ﬁ gure.

Half uniont

Externally

threaded side

Use a wrench to secure.

CAUTION

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

the conditions.

Outer dia. of copper pipe

6.35 mm

12.70 mm

• Tightening torque for connection of ﬂ are pipe

The pressure of R410A is higher than

R22. (Approx. 1.6 times.) Therefore

securely tighten the ﬂ are pipes which

connect the outdoor unit and the

indoor unit with the speciﬁ ed tightening

torque using a torque wrench. If any

ﬂ are pipe is incorrectly connected, it

may cause not only a gas leakage but

also trouble in the refrigeration cycle.

Evacuating

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

vacuuming together at once.

VACUUMING

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-ﬂ ow prevention function so

that inside oil of the pump does not ﬂ ow 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 happen.)

1110651154-EN.indd 7

Obliquity

Roughness

Warp

Conventional tool

used

0 to 0.5

1.0 to 1.5

0 to 0.5

1.0 to 1.5

R410A

6.35 mm

1.5 to 2.0

12.70 mm

2.0 to 2.5

Flare nut

Internally

threaded side

Use a torque wrench to tighten.

(Unit : N·m)

Tightening torque

14 to 18 (1.4 to 1.8 kgf·m)

50 to 62 (5.0 to 6.2 kgf·m)

Flare at

indoor unit side

Flare at

outdoor unit side

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 conﬁ rm

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

(For R410A only)

Connecting pipe

Packed valve at gas side

Service port (Valve core (Setting pin))

Packed valve at liquid side

CAUTION

• KEEP IMPORTANT 5 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.

Packed valve handling precautions

• Open the valve stem until it touches the stopper. Once it is in contact with

the stopper, refrain from applying any more force than is necessary.

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

Gas side

50 to 62 N·m

(dia. 12.70 mm)

(5.0 to 6.2 kgf·m)

Liquid side

14 to 18 N·m

(dia. 6.35 mm)

(1.4 to 1.8 kgf·m)

14 to 18 N·m

Service port

(1.4 to 1.8 kgf·m)

Wiring Connection

1. Remove the valve cover, the electric parts cover and the cord clamp from

the outdoor unit.

2. Connect the connecting cable to the terminal as identiﬁ ed by the

matching numbers on the terminal block of indoor and outdoor unit.

3. Insert the power cord and the connecting cable fully into the terminal

block and secure it tightly with screws.

4. Use vinyl tape, etc. to insulate the cords which are not going to be used.

Locate them so that they do not touch any electrical or metal parts.

5. Secure the power cord and the connecting cable with the cord clamp.

6. Attach the electric parts cover and the valve cover on the outdoor unit.

Electrical Work

1. The supply voltage must be the same as the rated voltage of the air

conditioner.

2. Prepare the power source for exclusive use with the air conditioner.

NOTE

• Wire type : H07RN-F or 60245 IEC66 (1.5 mm

Pressure gauge

Manifold valve

Handle Hi

(Keep full closed)

Charge hose

(For R410A only)

Vacuum pump adapter for

counter-ﬂ ow prevention

(For R410A only)

Vacuum

pump

Hexagon wrench

is required.

or more)

2/15/10 9:39:41 AM