Haier AU362AIEAA, AU36NAIEAA, AU60NAIEAA, AU48NAIEAA Air discharging method, Refrigerant piping

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

3-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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