Outdoor Unit Leak Test, Check for leakage

Installation Precedure

Outdoor Unit

6. Leak Test

Leak test must be made after connection of the refrigerant pipe according to the following diagram.

Close all the gas and liquid valves.To prevent nitrogen gas from invading the outdoor circulating system, close the valve tightly before pressure increase,(Both the gas and liquid valves must be tightly closed.)

Every cooling system must be charged slowly from the gas and liquid valves. It must be charged from the gas and liquid valves.

Note:

Never use oxygen, flamable and poisonous gases for the leak test.

			Low-pressure gauge			High-pressure gauge
			Three-way valve fully closed
Indoor	Outdoor		(gas side)		VL	VH
Indoor	Outdoor				VL	VH
						Gauge distributor
Tightly	Solder joint	Solder
closed		Solder
closed		joint	Access hole
		joint	Access hole	6.4
				6.4
			Copper pipe

Tightly	Solder joint		Tightly
closed			Tightly
closed			closed	Access hole
			closed

Indoor unit
				Outdoor unit
				Three-way valve fully closed
				liquid side
Detailed diagram of the three-way valve
To the gauge distributor			(Gas side )access hole
To the gauge distributor			(Gas side)three-way valve
			(Gas side)three-way valve
(Liquid side)access hole				To the unit
(Liquid side)three-way valve				To the unit
(Liquid side)three-way valve
		unitthe oT
	Field tube	Field tube
	installation	installation

6.4Relief valve

Copper pipe

Nitrogen bottle

(1)Pressurize for more than 3 minutes under 0.3MPa(3.0kg/cm2g)

(2)Pressurize for more than 3 minutes under 1.5MPa(15kg/cm2g). Serious leakage may be found.

(3)Pressurize for more than 24 hours under 3.0MPa(3.0kg/cm2g). Small leakage may be found.

Check if the pressure decrease

If the pressure does not decrease, then the test passes. If the pressure decrease, check for leakage.

There will be a 0.01MPa(0.1kg/cm2g) pressure change for every 1 C ambient temperature change during the 24-hour pressure charge. It should be corrected during the test.

Check for leakage

In the case of pressure decrease during steps (1) to (3), check the joints with the ear, hand or soapsuds for leakage. Repair it by welding or tighten the connecting nut up.

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