AirStage AJY040LBLAH Kurulum Kılavuzu - Sayfa 16

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8. PIPE INSTALLATION II

Fig. A Connection system

Pressure

gauge

Outdoor unit

Indoor

Vacuum

unit

pump

Table. A

Pipe

3-way valve

7.0 to 9.0 N·m

Liquid valve

(70 to 90 kgf·cm)

11.0 to 13.0 N·m

Gas valve

(110 to 130 kgf·cm)

8.1. Sealing test

Use only nitrogen gas.

Never use refrigerant gas, oxygen, in ﬂ ammable gas or poisonous gas to pressurize the

system. (If oxygen is used, there is the danger of an explosion.)

Do not apply shock during sealing test.

It can rupture the pipes and cause serious injury.

Do not turn on the power unless all operations are complete.

Do not block the walls and the ceiling until the sealing test and the charging of the refrig-

erant gas have been completed.

After connecting the pipes, perform an sealing test.

Recheck that the 3-way valve are closed before performing a sealing test.

(Fig. B)

Pour nitrogen gas through both the liquid pipe and the gas pipe.

Pressurize nitrogen gas to 4.2 MPa to perform the sealing test.

Check all ﬂ are connection areas and brazed areas.

Then, check that the pressure has not decreased.

Compare the pressures after pressurizing and letting it stand for 24 hours, and check that

the pressure has not decreased.

* When the outdoor temperature changes 5 °C, the test pressure changes 0.05 MPa.

If the pressure has dropped, the pipe joints may be leaking.

If a leakage is found, immediately repair it and perform a sealing test again.

* Decrease the pressure of nitrogen gas before blazing

After completing the sealing test, release the nitrogen gas from both valves.

Release the nitrogen gas slowly.

8.2. Vacuum process

Do not turn on the power unless all operations are complete.

If the system is not evacuated sufﬁ ciently, its performance will drop.

Be sure to evacuate the refrigerant system using a vacuum pump.

The refrigerant pressure may sometimes not rise when a closed valve is opened after

the system is evacuated using a vacuum pump. This is caused by the closure of the

refrigerant system of the outdoor unit by the electronic expansion valve. This will not

affect the operation of the unit.

Use a clean gauge manifold and charging hose that were designed speciﬁ cally for use

with R410A. Using the same vacuum equipment for different refrigerants may damage

the vacuum pump or the unit.

Do not purge the air with refrigerants, but use a vacuum pump to evacuate the system.

• If moisture might enter the piping, follow below. (i.e., if doing work during the rainy

season, if the actual work takes long enough that condensation may form on the

inside of the pipes, if rain might enter the pipes during work, etc.)

• After operating the vacuum pump for 2 hours, pressurize to 0.05 MPa (i.e., vacuum

breakdown) with nitrogen gas, then depressurize down to -100.7 kPa (-755 mmHg) for

an hour using the vacuum pump (vacuum process).

• If the pressure does not reach -100.7 kPa (-755 mmHg) even after depressurizing for

at least 2 hours, repeat the vacuum breakdown - vacuum process.

After vacuum process, maintain the vacuum for an hour and make sure the pressure

does not rise by monitoring with a vacuum gauge.

En-15

Fig. B

Service hose

Pressure regu-

with valve core

lating valve

Charging

port

Nitrogen

Blank cap

Scale

Hexagon wrench

4 mm (5/32")

Blank cap

Charging port cap

20.0 to 25.0 N·m

12.5 to 16.0 N·m

(200 to 250 kgf·cm)

(125 to 160 kgf·cm)

30.0 to 35.0 N·m

12.5 to 16.0 N·m

(300 to 350 kgf·cm)

(125 to 160 kgf·cm)

CAUTION

Evacuation procedure

(1) Remove the blank caps of the gas pipe and liquid pipe and check that the valves are

closed.

(2) Remove the charging port cap.

(3) Connect a vacuum pump and a pressure gauge to a charging hose and connect it to

the charging port.

(4) Activate the vacuum pump and vacuum the indoor unit and connection piping until the

Charging

pressure gauge becomes -100.7 kPa (-755mm Hg).

port cap

Evacuate from both the gas pipe and the liquid pipe.

(5) Continue evacuating the system for 1 hour after the pressure gauge reads -100.7 kPa

(-755mm Hg).

3-way

(6) Remove the charging hose and reinstall the charging port cap.

valve

8.3. Additional charging

Connecting

pipe

Do not turn on the power unless all operations are complete.

After evacuating the system, add refrigerant.

Do not charge the system with a refrigerant other than R410A.

Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the

total amount of refrigerant will lead to malfunction during charging of refrigerant.

Do not reuse recovered refrigerant.

Use an electronic scale to measure the charging amount of refrigerant.

Adding more refrigerant than the speciﬁ ed amount will cause a malfunction.

Charge refrigerant using the liquid pipe.

Adding refrigerant through the gas pipe will cause a malfunction.

Add refrigerant by charging the system with the refrigerant in the liquid state. If the refrig-

erant cylinder is equipped with a siphon, it is not necessary to place the cylinder upright.

Check if the steel cylinder has a siphon installed or not before ﬁ lling. (There is an indica-

tion "with siphon for ﬁ lling liquid" on the steel cylinder.)

Filling method

for cylinder with

siphon

Filling method

for other cylin-

ders

Be sure to use the special tools for R410A for pressure resistance and to avoid mixing of

impure substances.

If the units are further apart than the maximum pipe length, correct operation can not be

guaranteed.

Make sure to back closing valve after refrigerant charging. Otherwise, the compressor

may fail.

Minimize refrigerant release to the air. Excessive release is prohibited under the Freon

Collection and Destruction Law.

8.3.1 Procedure for charging the system with refrigerant

(1) Remove the charging port cap from the liquid pipe.

(2) Attach a charging hose to the refrigerant cylinder, and connect it to the charging port.

(3) Add refrigerant by calculating the additional refrigerant volume in accordance with the

calculation formula indicated below.

(4) Remove the charging hose and install the charging port cap.

(5) Remove the blank caps (gas pipe and liquid pipe) and open the valves.

(6) Close the blank caps.

(7) After adding refrigerant, indicate the added charging volume on the unit.

* Tighten the blank caps and charging port caps to the torque values speciﬁ ed in the Table

A. To open and close the valves, use an M4 hexagon wrench.

8.3.2 Checking total amount of refrigerant and calculating the

amount of refrigerant charge to be added

• The amount of refrigerant charge to be added is the total value of the basic refrigerant

charge amount and the value calculated from the length of the liquid pipe.

• Round up the value to 2 decimal places.

Model

AJ*040LBLAH

AJ*045LBLAH

AJ*054LBLAH

CAUTION

Set the cylinder vertical and ﬁ ll with

R410A

the liquid.

Gas

(Liquid can be ﬁ lled without turning

bottom up with the siphon inside.)

Liquid

Turn bottom up and ﬁ ll with liquid.

R410A

(Be careful to avoid turning over

Gas

the cylinder.)

Liquid

"B"

Factory charged

Diameter of liquid

amount (kg)

pipe (mm)

4.80

5.30

Ø 6.35

5.30

Ø 9.52

"a"

Additional amount

for pipe length (kg/m)

0.021

0.058