Installation

AirPurging

Air purging

The 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, after evacuating the system, leak test the piping and tubing between the indoor and outdoor unit.

Air purging with vacuum pump

1. Preparation

•Check that each tube(both liquid and gas side) 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. Note that both the liquid and the gas side service valves on the outdoor unit are kept closed at this stage.

2. Leak test

•Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with charge hoses.

Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose. The "Hi" knob of the manifold valve must always be kept close.

•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.

To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder must be higher than its bottom when you pressurize the system. Usually, the cylinder is used in a vertical standing position.

1.Do a leak 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.

Manifold valve

Indoor unit

 

Lo

Hi

Charge hose

 

Outdoor unit

 

Nitrogen gas

 

cylinder(in vertical

 

standing position)

 

24Room Air Conditioner

Page 23 Page 25
Page 24
Image 24
Celestron VMC30SB-1, VMH30SB-1 manual Air Purging, Air purging with vacuum pump, Preparation
Page 23 Page 25

VMH30SB-1, VMC30SB-1 specifications

The Celestron VMC30SB-1 and VMH30SB-1 telescopes are exceptional instruments designed for both amateur astronomers and experienced stargazers alike. These models offer remarkable optical performance in compact packages, making them ideal for both home use and portable observations.

The VMC30SB-1 features a unique catadioptric design combining a primary mirror with a corrector lens, enabling significant improvements in image quality and sharpness. This design minimizes spherical aberration and allows for more precise focusing. With an aperture of 30 cm, it captures ample light for deep-sky observing while maintaining a manageable size for transport.

The telescope utilizes a Vixen-style dovetail mounting, which ensures compatibility with a variety of mounting systems. This flexibility allows users to easily switch between different mounts according to their preference or observing needs. The VMC30SB-1 is also equipped with a 2-inch dual-speed focuser, which provides smooth and precise focusing, enhancing the overall observing experience.

On the other hand, the VMH30SB-1 offers similar optical and mechanical features but integrates a specialized coating technology to enhance light transmission and reduce glare. This ensures that users can enjoy brighter and clearer images of celestial objects, making faint details more visible.

Both models come with a solid, stable optical tube that minimizes vibrations, ensuring steady views even at high magnification. They include a built-in finderscope that simplifies locating celestial objects, coupled with a user-friendly interface for easy operation.

Moreover, Celestron’s innovative StarSense technology is available for these telescopes, allowing for automatic alignment and facilitating a smooth observing experience. Users can set up quickly, even in challenging conditions, without the need for extensive setup procedures.

In conclusion, the Celestron VMC30SB-1 and VMH30SB-1 are robust telescopes that bring a blend of advanced technology, superior optics, and user-friendly features. Whether for detailed planetary observation or exploring deep-sky wonders, these telescopes are a remarkable choice for enthusiasts looking for quality and convenience in one reliable package. With their durable construction and outstanding performance, they stand out in the competitive astronomy market, offering experiences that inspire awe and curiosity about the universe.
Top Page Image Contents