Air Conditioning / Vacuum pump requirement

Sep 12, 2006 7 Replies
K

Hi



I'm looking for a cheap split Air Conditioning unit for a new conservatory. Some of these units say "No Vacuum Pump required":



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dont mention it:



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I generally understand that performance will be 'better' if the pipes are vacuum pumped, do they need to be, and if not will it degrade the life / performance of the system a great deal?



For clarity I am not talking about the B&Q style DIY install units here with the sealed pipe units, but units where the pipe is supplied effecticley open and flare joints are used.



Thanks in advance. Kevin



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S

It is my understanding that the vacuum pump is virtually essential and anyone who says its use is optional is not being 100% truthful.

Have a look at

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- they are not much more expensive than the various eBay sellers but are completely honest about the necessity of using the vacuum pump. They also supply a pump with the purchased units for a nominal hire fee and deposit.

Regards,

Steve

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G

The message from "stevelup" contains these words:

Not on all their units...

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S

Yes but the original poster said he wasn't interested in 'easy fit' units with preterminated connectors though...

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A

I love these installation pictures...

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K

Ok, thanks for your thoughts.

I had found the hire offer from Global, but unfortunately the units are massively more expensive. I can buy a 21k BTU unit from ebay for 315, they are over 1,000 pounds from Gobal.

I have found a place that will hire the pump and manifold set to 'non-purchasers' via ebay for around 75 pounds for a week, or I can get the unit 'commissioned' (Ie after I have installed it) for around 125 pounds. If I didn't need to do either of those that would obviously be even better.

Cheers Kev

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A

What kind of pressures are we talking about here? Would a homemade vacuum pump be diyable? (this is uk.d-i-y afterall)

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K

The setup I have just seen shows leaving the vacuum pump running for 30 mins and achiveing a vacuum of -1 bar (but that was as low as the gauge went).

Cheers Kev

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