Fujitsu 24LMAS1 Manual de instalação - Página 8

Procurar online ou descarregar pdf Manual de instalação para Ar condicionado Fujitsu 24LMAS1. Fujitsu 24LMAS1 17 páginas. Outdoor unit

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Operating the valves

• Use a hexagon wrench (size 4 mm).

• Opening

(1) Insert the hexagon wrench into the valve shaft, and turn it

counterclockwise.

(2) Stop turning when the valve shaft can no longer be turned.

(Open position)

• Closing

(1) Insert the hexagon wrench into the valve shaft, and turn it clockwise.

(2) Stop turning when the valve shaft can no longer be turned.

(Closed position)

Opening direction

Liquid pipe

3.6. Sealing test

• Before operating the compressor, install the pipes and securely connect them.

Otherwise, if the pipes are not installed and if the valves are open when the compres-

sor operates, air could enter the refrigeration cycle. If this happens, the pressure in the

refrigeration cycle will become abnormally high and cause damage or injury.

• After the installation, make sure there is no refrigerant leakage. If the refrigerant

leaks into the room and becomes exposed to a source of fire such as a fan heater,

stove, or burner, it produces a toxic gas.

• Do not subject the pipes to strong shocks during the sealing test. It can rupture the

pipes and cause serious injury.

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

refrigerant gas have been completed.

• For maintenance purposes, do not bury the piping of the outdoor unit.

After connecting the pipes, perform a sealing test.

(1) Make sure that the 3-way valves are closed before performing a sealing test.

(2) Pressurize nitrogen gas to 602 psi (4.15 MPa) to perform the sealing test.

(3) Add nitrogen gas to both the liquid pipes and the gas pipes.

(4) Check all flared and brazed connections. Then, check that the pressure has not

decreased.

(5) Compare the pressures after pressurizing and letting it stand for 24 hours, and

check that the pressure has not decreased.

* When the outdoor air temperature changes 41 °F (5 °C), the test pressure

changes 15 inHg (0.05 MPa). If the pressure has dropped, the pipe joints may be

leaking.

(6) If a leak is found, immediately repair it and perform the sealing test again.

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

(8) Release the nitrogen gas slowly.

3.7. Vacuum process

• Perform a refrigerant leakage test (air tightness test) to check for leaks using nitrogen

gas while all valves in the outdoor unit are closed. (Use the test pressure indicated

on the nameplate.)

• 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.

• If the system is not evacuated sufficiently, its performance will drop.

• Use a clean gauge manifold and charging hose that were designed specifically 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 sys-

tem.

En-8

Hexagon wrench

Seal (blank cap

installation portion)

Gas pipe

WARNING

CAUTION

Refrigerant for purging the air is not charged in the outdoor unit at the factory.

(1) Remove the cap, and connect the gauge manifold and the vacuum pump to the

charging valve by the service hoses.

(2) Vacuum the indoor unit and the connecting pipes until the pressure gauge indicates

-30 inHg (-0.1 MPa).

(3) When -30 inHg (-0.1 MPa) is reached, operate the vacuum pump for at least

60 minutes.

(4) Disconnect the service hoses and fit the cap to the charging valve to the specified

torque.

(5) Remove the blank caps, and fully open the spindles of the 3-way valves with a

hexagon wrench [Torque: 6 to 7 lbs·ft (4 to 5 N·m)].

(6) Tighten the blank caps of the 3-way valves to the specified torque.

Blank cap [in (mm)]

1/4 (6.35)

3/8 (9.52)

1/2 (12.70)

5/8 (15.88)

3/4 (19.05)

Charging port cap

Service hose with valve core

Charging port

Blank cap

Hexagon wrench

Use a 4 mm

hexagon

wrench

3.8. Additional charging

When moving and installing the air conditioner, do not mix gas other than the specified

refrigerant R410A inside the refrigerant cycle.

If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to

an abnormally high value and cause breakage, injury, etc.

Charge the refrigerant following the instruction in "2.6. Additional charge amount".

• After vacuuming the system, add refrigerant.

• Do not reuse recovered refrigerant.

• When charging the refrigerant R410A, always use an electronic scales for refriger-

ant charging (to measure the refrigerant by weight). Adding more refrigerant than

the specified amount will cause a malfunction.

• When charging the refrigerant, take into account the slight change in the composi-

tion of the gas and liquid phases, and always charge from the liquid phase side

whose composition is stable.

• Check if the steel cylinder has a siphon installed or not before filling. (There is an

indication "with siphon for filling liquid" on the steel cylinder.)

Filling method for cylinder with siphon

R410A

Gas

Set the cylinder vertical and fill with the liquid.

(Liquid can be filled without turning bottom up with the

siphon inside.)

Liquid

Filling method for other cylinders

R410A

Gas

Turn bottom up and fill with liquid.

(Be careful to avoid turning over the cylinder.)

Liquid

• Be sure to use the special tools for R410A for pressure resistance and to avoid mix-

ing 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 compres-

sor may fail.

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

Freon Collection and Destruction Law.

Tightening torque [lbf·ft (N·m)]

14.8 to 18.4 (20 to 25)

18.4 to 22.1 (25 to 30)

22.1 to 25.8 (30 to 35)

25.8 to 29.5 (35 to 40)

9.2 to 11.8 (12.5 to 16)

Charging port cap

3-way valve

Connecting pipe

Gauge manifold

Vacuum pump

Service hose

WARNING

CAUTION