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Evacuation for Your Air Conditioning System

preparing the air conditioning system for total repair, e.g. compressor replacement,

making sure that refrigerant that is originally contained within the system, is not released into the atmosphere

charging a non azeotrope (400 series, except for R-410) refrigerant

This type of air conditioning maintenance is performed by an external compressor, attached to the system through the service...

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Air Conditioning System Pump Down - Air Conditioner Selection

switch off the air conditioning unit, then,

attach the compound pressure gauge to the vapour line service valve

turn the knob on the service valve, to position it in between fully opened, and fully closed.

You will notice that the pressure gauge reading will increase

next, operate the air conditioning unit for 3 to 5 minutes,

isolate the liquid line by closing the liquid line service valve.

You will start to notice the reducing pressure reading on the compound gauge

isolate the vapour line service valve by closing it, once...

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How to Recharge Air Conditioner

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How to Recharge Air Conditioner

There are three different ways of how to recharge air conditioner systems. The methods for this air conditioning maintenance are,

refrigerant charging from high pressure side,

refrigerant charging from low pressure side,

and refrigerant charging using weight

Purpose, do's and don'ts, and some advice:

Here are some extra tips for you before venturing...

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Superheat and Subcooling Measurement in Air Conditioning ...

Superheat and subcooling are two phenomenon that will occur to a medium that boils and condenses, respectively.

Air conditioning technician will use measurement of these properties during troubleshooting and maintenance , to gauge performance of an air conditioning system.

Superheat is defined as

The temperature rise beyond boiling temperature of a medium.

Whereas subcooling is

The temperature...

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How Air Conditioners Work - The Mechanical Cycle

Tubing to make the system, a closed loop system

Refrigerant

Yes, air conditioners work in a closed loop arrangement and filled with necessary quantity of refrigerant to cool the air. That is the secret (well, not anymore) of how air conditioners work out the cooling effect.

Fundamentally, ACUs (air conditioning units) have two sides. The high pressure side and the low pressure side.

The high...

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Simple Guide to Air Conditioner Sizing

1,200 BTU

per kitchen

The major problem with this way of air conditioner sizing is that, all the assumptions made are NEVER constant.

There are variations in wall construction, presence of plants and trees and facing direction of the house (East, West, South or North), will have impact on heat gain and loss of the house.

Furthermore, the numbers I have stated, vary from a contractor to another....

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Expansion Valves and Devices in Air Conditioning Systems

You have to know by now, that expansion valves and devices in air conditioning systems have the function of,

allowing pressure build up from the compressor's outlet , and hence separating the high pressure and low pressure sides of an air conditioner, and

regulating the flow of liquid refrigerant , into expansion zone. Too much liquid into expansion zone is not good. Too little is just as bad

It is a form of flow limitation device to enable pressure drop across the inlet and outlet lines, as explained here .

So, what is too much and too little of flow?

It depends on the...

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Air Conditioner Fans and Blowers

The function of air conditioner fans and blowers:

We have learned in Air Conditioner Parts that fans function as air movers. This equipment will enable forced convection to occur, thus improving the heat transfer rate.

In addition to that, it makes compact design of evaporator and condenser, possible. Depending on natural convection would otherwise mean very large evaporator and condenser design....

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