Air Purging and Evacuation

Air Purging and Evacuation

Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.

1.Pressure in the system rises.

2.Operating current rises.

3.Cooling(or heating) efficiency drops.

4.Moisture in the refrigerant circuit may freeze and block capillary tubing.

5.Water may lead to corrosion of parts in the refrigeration system.

Therefore, the indoor/outdoor unit and connecting tube must be checked for leak tight, and vacuumed to remove incondensible gas and moisture in the system.

Checkingmethod

Preparation

•Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have been properly connected and all wiring for the test run has been completed. Remove the service valve caps from both the gas and the liquid side on the outdoor unit. Check that both the liquid and the gas side service valves on the outdoor unit are kept closed at this stage.

Leakage test

1.Do a leakage test of all joints of the tubing(both indoor and outdoor) and both gas and liquid side service valves.

Bubbles indicate a leak. Be sure to wipe off the soap with a clean cloth.

2.After the system is found to be free of leaks, relieve the nitrogen pressure by loosening the charge hose connector at the nitrogen cylinder. When the system pressure is reduced to normal, disconnect the hose from the cylinder.

• Connect the manifold valve(with pressure gauges)

 

 

 

 

and dry nitrogen gas cylinder to this service port

 

 

 

 

with charge hoses.

 

 

Indoor unit

 

CAUTION: Be sure to use a

 

 

 

 

 

 

 

manifold valve for leak testing.

 

 

 

 

The high side manifold valve must

Outdoor unit

 

 

always be kept closed.

 

 

 

 

 

 

• Pressurize the system to no more than 150

 

 

 

 

P.S.I.G. with dry nitrogen gas and close the

 

 

 

 

cylinder valve when the gauge reading

 

 

 

 

reached 150 P.S.I.G. Next, test for leaks with

 

 

 

 

liquid soap.

Manifold valve

 

CAUTION: To avoid nitrogen

Pressure

Lo

Hi

 

entering the refrigerant system in a

gauge

 

 

 

 

 

 

 

liquid state, the top of the cylinder must be

 

 

Charge hose

 

higher than its bottom when you pressurize

 

 

 

 

 

 

 

the system. Usually, the cylinder is used in

 

 

 

 

a vertical standing position.

 

 

Nitrogen gas

 

 

 

 

 

 

 

 

cylinder(in vertical

 

NOTICE : Leakage test shoud be done for

 

 

standing position)

 

 

 

 

 

each indoor unit connection set, separately.

 

 

 

 

 

 

 

Installation Manual

25

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Heat Controller DMH36TB-1, DMC24DB-1, DMH24DB-1 DMC36TB-1 manual Air Purging and Evacuation, Checking method
Page 24 Page 26

DMC24DB-1, DMH24DB-1 DMC36TB-1, DMH36TB-1 specifications

The Heat Controller DMH24DB-1 and DMC24DB-1 units stand out in the realm of climate control solutions, combining advanced technology with user-friendly features to enhance indoor comfort. These air conditioning systems are designed to provide efficient cooling and heating for both residential and commercial spaces.

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In summary, the Heat Controller DMH24DB-1 and DMC24DB-1 units are high-performance air conditioning systems equipped with advanced technologies and practical features, making them an excellent choice for anyone seeking efficient and reliable climate control solutions. Their energy efficiency, enhanced air quality, and smart technology integration position them as leaders in the market.
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