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ENGLISH

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

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

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 -100.7 kPa

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

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

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

remaining 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 0.05 MPa(7.3 psi) (vacuum break) with nitrogen gas and then
evacuate it again with the vacuum pump for 1hr to -100.7 kPa(-14.6
psi)(vacuum drying). If the system cannot be evacuated to -100.7
kPa(-14.6 psi) 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.

NOTE

Always add an appropriate amount of refrigerant. (For the refrigerant
additional 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.)

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

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

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

refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.

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.

Indoor unit

Slave 1 outdoor unit

Master outdoor unit

Liquide pipe

Gas pipe

Liquide pipe

Gas pipe

Liquid side

Gas side

Close

Vacuum
pump

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 0.01 Mpa(1.5 psi) 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

3.8 MPa(551psi) is 80.6 °F (27 °C)
24 hour later: 3.73 MPa(541 psi), 68 °F
(20 °C)
In this case the pressure drop of 0.07 MPa
(10 psi) is because of temperature drop
And hence there is no leakage in pipe
occurred.

Liquid pipe

Gas pipe

Heat Pump System Installation

Ⓐ

Manifold Gauge

Ⓑ

Low Pressure Side Handle

Ⓒ

High Pressure Side Handle

• Pipe to be vacuumed : gas pipe, liquid pipe

• If the refrigerant amount is not exact, it may not operate

properly.