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which Equipment for measuring?

post #1 of 9
Thread Starter 
Hi i cant find the thing i read before about charging a system but it said about using something to measure something when charging a custom system.

Is this the sort of thing im looking for

http://cgi.ebay.co.uk/Digital-Micron...QQcmdZViewItem

or a manometer or something different
post #2 of 9
this gauge has a purpose of a precise evacuation, not for charge.
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post #3 of 9
Thread Starter 
ok thanks. So what equipment should i use for an accurate charge? Or will the gauges on the manifold suffice?
post #4 of 9
The manifold dont give you a very accurate evac.
For this you need a good pump and a evac gauge.
[]s
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post #5 of 9
Charging station's are a god thing to have but are unnecessary when your just building small unit's.

Your Charging manifold's gauges will suffice.

A Charging station has a set of scales, you just but your canister of refrigerant onto it and set it to zero, then you fill your unit, it allow's you to put an exact volume/weight of refrigerant into the unit.
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post #6 of 9
Thread Starter 
ok thanks guys. I have a set of manifold gauges (the one petrolhead suggested from bes with the interchangable plastic reading glass things) I am bidding on a vacuum pump a robinair 4cfm 20 micron one and also a set of refrigerant scales. Should this be enough or can you suggest something else i might need? Also how will the scales help with charging a new system if its custom build, surely they will only help if you already know how much weight of refrigerant the system needs to be charged with.
post #7 of 9
You are correct but if you charge the system then tune it you can find out the weight of refrigerant then you know exactly how much gas you need next time, that's if your building load's of identical unit's though

You don't really need them, to be honest.
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post #8 of 9
Thread Starter 
ok so i wont bother getting the scales because this is just a one of personal project and if i build another system it will only be to superseed this system. So is there anything else i need or should use to get an acuurate charge or is it just guesswork?
post #9 of 9
You charge the unit to 50 psi and then fire up the compressor, and all related fans, the evap should be hooked up to your CPU or a load tester, you then need to put the maximum load you can onto the CPU.

Your Evap's temp will rise but just put a but more gas in then wait until the temp stabilises then add a bit more gas keep doing this until you can't go any lower, ie: Evap temp will not drop anymore
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