Refrigerant Charging - LG MULTI V 5 ARUN120BTE5 Installation Manual

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Table of Contents

1,MFL67221438,영영 2018. 10. 4. 영영 11:29 Page 19

WARNING

Use a vacuum pump or Inert(nitrogen) gas when doing leakage test

or air purge. Do not compress air or Oxygen and do not use Flamma-

ble gases. Otherwise, it may cause fire or explosion.

- There is the risk of death, injury, fire or explosion.

NOTE

If the ambient temperature differs between the time when pressure is

applied and when the pressure drop is checked, apply the following

correction factor

There is a pressure change of approximately 0.01Mpa(1.5psi) for each

33.8°F (1°C) of temperature difference.

Correction= (Temp. at the time of pressurization – Temp. at the time of

check) X 0.1

For example: Temperature at the time of pressurization

CAUTION

To prevent the nitrogen from entering the refrigeration system in

the liquid state, the top of the cylinder must be at higher position

than the bottom when you pressurize the system.

Usually the cylinder is used in a vertical standing position.

Vacuum Drying

Vacuum drying should be made from the service port provided on the outdoor

unit's service valve to the vacuum pump commonly used for liquid pipe, gas

pipe and high/low pressure common pipe. (Make Vacuum from liquid pipe, gas

pipe and high/low pressure common pipe with the service valve closed.)

* Never perform air purging using refrigerant.

• Vacuum drying: Use a vacuum pump that can evacuate to -100.7kPa

(-14.6psi, 5 Torr, -755mmHg).

- Evacuate the system from the liquid and gas pipes with a vacuum

pump for over 2 hrs and bring the system to -100.7kPa(-14.6psi).

After maintaining system under that condition for over 1 hr, confirm

the vacuum gauge rises. The system may contain moisture or leak.

- Following should be executed if there is a possibility of moisture re-

maining inside the pipe.

(Rainwater may enter the pipe during work in the rainy season or

over a long period of time)

After evacuating the system for 2 hrs, give pressure to the system

to 0.05MPa(7.3psi) (vacuum break) with nitrogen gas and then evac-

uate it again with the vacuum pump for 1hr to -100.7kPa(-

14.6psi)(vacuum drying). If the system cannot be evacuated to

-100.7kPa(-14.6psi) within 2 hrs, repeat the steps of vacuum break

and its drying. Finally, check if the vacuum gauge does not rise or

not, after maintaining the system in vacuum for 1 hr.

Slave 1 outdoor unit

Vacuum

pump

Scale

Use a graviometer. (One that

can measure down to 0.1 kg).

If you are unable to prepare

such a high-precision gravimeter

you may use a charge cylinder.

3.8MPa(551psi) is 80.6°F (27°C)

24 hour later: 3.73MPa(541psi), 68°F (20°C)

In this case the pressure drop of 0.07MPa

(10psi) is because of temperature drop

And hence there is no leakage in pipe oc-

curred.

Master outdoor unit

Liquid side

Gas side

WARNING

Use a vacuum pump or Inert(nitrogen) gas when doing leakage test

or air purge. Do not compress air or Oxygen and do not use Flamma-

ble gases. Otherwise, it may cause fire or explosion.

- There is the risk of death, injury, fire or explosion.

NOTE

Always add an appropriate amount of refrigerant. (For the refrigerant addi-

tional charge)

Too much or too little refrigerant will cause trouble.

To use the Vacuum Mode (If the Vacuum mode is set, all valves of Indoor

units and Outdoor units will be opened.)

WARNING

When installing and moving the air conditioner to another site,

recharge after perfect evacuation.

- If a different refrigerant or air is mixed with the original refriger-

ant, the refrigerant cycle may malfunction and the unit may be

damaged.