Tuesday, 14 February 2012

Materials for installation

This post will touch on materials used for aircon installation.

Copper Pipes

1/4 refer to pipe size, 22 SWG refer to the gauge, 15m is the length of the pipe

This is used to transfer the gas (Liquid form) from the outdoor to the indoor unit (blower units) and gas (Gas form) from the indoor to the outdoor.
This is the most important material for the installation as gas travels in it.
Copper pipe comes in different grades.
Lowest is SWG (Standard working guage) 24 or G (guage)24.
G24 refers to the thickness of the copper pipes. 
G23 is thicker then G24, G21 is the thickest among all.

Improper installation/handling of copper pipes may cause the following.
- Condensation of pipes at certain area. 
This will usually happen around the bend part. If the installer uses a proper tool known as the pipe bender to bend, the result will be a nicely bent pipe.
Gas flow will be smooth.
If they use their hand, it may have some acute angle. 
Gas might not flow smoothly and icing might occur, which will lead to condensation. Even with how thick a insulation, it will not stop the condensation. 

I will suggest HDB flat owners to use min G23.
For concealed pipings in condo/pte hse, you may want to upgrade to G22.



Insulation
This is the black rubber foam thing which is used to encase the copper piping.
During operation, the copper pipes are cold and some water droplets will form due to condensation.
The insulation will serve to absorb water droplets.
There are 2 classes of insulation. Class 0 and class 1.
The class refers to the fire rated properties of the insulation. In aircon, we are talking about absorbing water, so do you think its worth to pay for a upgrade from Class 1 to Class 0?

I will suggest to use 3/8 thickness insulation for piping in trunking.
For piping above false ceiling or concealed in wall, you may consider to upgrade to 1/2 thickness insulation.

Wire

3 Cord Wire
Wiring is used as a form of power supply for the aircon system and a form of communication between the indoor and the outdoor units.
For the wiring between the outdoor unit to the power point, usually 3C70 is used. For aircon system up to 36k btu capacity.
3C70 refers to 3 cord, (3 pieces of wire), one for live (brown), one for netural (blue), one for earth (green).
70 refers to the number of copper strand inside a single cord.
Between the indoor to the outdoor units, 3C40 is used.
Reason for a lower grade is because, the indoor unit does not consume a lot of amphere.
1 is for live power supply, another is netural power return. The 3rd is for communication purposes between the indoor and outdoor.


PVC pipe also known as drainage pipe
There are 2 sizes used in the market, 13mm and 16mm. It refers to the internal diameter of the pipe. 
16mm has a bigger diameter and might allow for better flow of drain water and prolong the time taken for the build up of jelly and cause the aircon to leak water.
Some companies also have the good practice of applying insulation 3/8 thickness to the horizontal Pvc pipes.
Vertical pipes do not need insulation as water will fall fast due to gravity.




Trunking
Trunking


This is the plastic casing that encase the copper, pvc pipes and wiring.
It is important that there are of the correct size as getting a size smaller will lead to the copper pipes insulation pressing against one another and increase the chances of condensation.






All information above are my own views. 
Feel free to contact me if you feel there are any wrong/misleading info posted.
Thanks.


16 Comments:

At 12 November 2014 at 20:27 , Blogger Pipe shop said...

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At 7 February 2015 at 15:17 , Blogger vincenttay said...

Thank for sharing and I can reassure that all the information given here is all correct. aircon services

 
At 22 September 2015 at 02:18 , Blogger Unknown said...

Would you advise using copper piping grade 21 or 22? One aircon company told me 21 is the best grade, while the other company told me 21 is too stiff and cannot be bent easily, and 22 is much better. Would appreciate your opinion.

Also, what else should I look out for? Based on above, class and thickness of insulation?

 
At 28 November 2015 at 03:45 , Blogger Zem Karlos said...

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At 28 January 2016 at 18:54 , Blogger DH said...

Is it common to have open gaps at the top surface of trunking and no sealent applied to close it since no body can see? contractor said they apply sealent at the bottom of trunking because for better outlook since everybody can see it. But my view is insects can go into the trunking to make home or bite the rubber insulation through these gaps. For your comments please. Thanks.

 
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