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 incondensi- ble 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 ser- vice valve caps from both the gas and the liquid side on the out- door 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 nitro-

 

 

 

 

gen gas cylinder to this service port with charge hoses.

 

 

 

 

CAUTION: Be sure to use a manifold

 

 

Indoor unit

 

valve for leak testing.

 

 

 

 

 

 

 

The high side manifold valve must always

 

 

 

 

be kept closed.

Outdoor unit

 

 

 

• 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.

 

 

 

 

CAUTION: To avoid nitrogen entering the

 

 

 

 

refrigerant system in a liquid state, the top

Manifold valve

 

of the cylinder must be higher than its bottom

 

Pressure

 

 

 

when you pressurize the system. Usually, the

Lo

Hi

 

gauge

 

 

 

cylinder is used in a vertical standing position.

 

 

 

 

 

 

 

Charge hose

 

NOTICE : Leakage test shoud be done for each indoor

 

 

 

 

unit connection set, separately.

 

 

 

 

 

 

 

Nitrogen gas

 

 

 

 

cylinder(in vertical

 

 

 

 

standing position)

 

 

 

 

Service Manual

31

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Heat Controller DMH24DB-1, DMC24DB-1 manual Air Purging and Evacuation, Checking method
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DMC24DB-1, DMH24DB-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.

One of the main features of the DMH24DB-1 and DMC24DB-1 is their inverter technology. This cutting-edge technology allows the units to adjust the compressor speed according to the cooling demands of the space, leading to significant energy savings. By operating at variable speeds instead of a fixed setting, the inverter provides a more consistent temperature, reduces wear and tear on components, and minimizes energy consumption, which can translate to lower electricity bills.

Both models offer a sleek and modern design, making them not only functional but also aesthetically pleasing. The indoor units are designed for easy placement in various environments and can blend seamlessly with any decor. In addition, they are relatively quiet during operation, with low noise levels that enhance indoor comfort without disturbing daily activities.

Another notable feature is the integrated smart control system that allows users to operate the units via a smartphone or tablet. This capability offers the convenience of adjusting settings from anywhere, ensuring that your space is always at the desired temperature when you arrive home or the office. The app can provide insights into energy consumption, allowing users to make informed decisions about their heating and cooling usage.

The DMH24DB-1 and DMC24DB-1 models also boast efficient filtration systems that help improve indoor air quality. The filters are designed to capture dust, pollen, and other allergens, contributing to a healthier living or working environment. This is particularly important for individuals with allergies or respiratory issues.

With a variety of cooling and heating modes, these units can cater to different user preferences and seasonal demands. Features like turbo mode are designed to quickly bring a space to the desired temperature, while the eco-friendly refrigerant helps reduce environmental impact.

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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