Installation Procedure

Refrigerant piping

 

 

5. Air discharging method

After finishing connection of refrigerant pipe, it shall perform air tightness test.

The air tightness test adopts nitrogen tank to give pressure according to the pipe connection mode as the following figure shown.

The gas and liquid valve are all in close state. In order to prevent the nitrogen entering the circulation system of outdoor unit, tighten the valve rod before giving pressure (both gas and liquid valve rods).

 

 

Low pressure peizometer

 

 

 

High pressure peizometer

Indoor

Outdoor

3-way valve totally closed

 

(Gas side)

VL VH

 

 

 

Meter separator

Completely tightened

Flare part

Discharging valve

 

 

 

Completely tightened

Indoor units

First step: 0.3MPa (3. 0kg/cm2g) pressurize over 3 minutes.

Second step: 1.5Mpa (15kg/cm2g) pressurize over 3 minutes. Large leakage will be found.

Third step: 3.0 MPa (30kg/cm2g) pressurize about 24 hours. Little leakage will be found.

Flare part

Manhole

Dropping valve

 

 

Nitrogen tank

Outdoor units

2-way valve totally closed (Liquid side)

LINE

 

CYLINDER

 

PRESSURE

PRESSURE

 

 

 

GAUGE

GAUGE

 

 

 

TUBING

 

 

BRING

 

 

BRAZED

 

 

SWEAT

 

 

JOINT

 

CYLINDER

LARGE

 

OF

 

NITROGEN

SLIP-ON

 

 

CONNECTOR

 

 

SERVICE

 

 

HOUSE

 

 

Check if the pressure drops

The pressure does not drop-passed

The pressure drops-check the leaking point.

From pressurizing to 24 hours later, each 1* difference of ambient temperature will make 0.01MPa(0.1kg/cm2g) pressure change. It shall be corrected during test.

Checking the leaking point

In the first to third test steps, if the pressure drops, check the leakage in each joint use sense of hearing, feeling and soap water, etc. methods to find the leaking point. After confirming the leaking point, welding it again or tighten the nut tightly again.

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Haier AU182AFERA, AU36NAHERA, AU362AHERA, AU242AGERA, AU282AHERA installation instructions Air discharging method

AU282AHERA, AU242AGERA, AU362AHERA, AU36NAHERA, AU182AFERA specifications

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