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Thread: non-condensable gas
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15-03-2007, 01:44 PM #1
non-condensable gas
hi
how can you tell that system is runing under non-condensible gaz. basically what are the symptoms?
mallmk13
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15-03-2007, 02:08 PM #2
Re: non-condensable gas
High discharge pressure
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15-03-2007, 02:11 PM #3
Re: non-condensable gas
Liquid refrigerant temperature measured are much higher than it's saturation temperature corresponding to the pressure.Abnormal high pressure.
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15-03-2007, 02:13 PM #4
Re: non-condensable gas
Hi Mallmk,
I see you've double posted this thread....so do you want to delete one.
As to your question...A non condensible in a system will generally cause high head pressure....this is a because as it does not condense (unlike refrigerant) it will tend to collect in the condenser and vapour space in the liquid receiver (if one is fitted).
As a consequence of this, the effective area of the condenser is reduced and so the system is unable to get rid of the heat. This will cause the head pressure (and consequently the whole system pressure i.e suction pressure as well) to rise.
The compressor will have to work harder....drawing more current. The system will trip on HP (if protected), the compressor might well trip out on temperature or current.
The rise in suction pressure will adversely affect you cabinet temperature.
Do you follow all this....it should be a logical thought process.
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15-03-2007, 02:28 PM #5
Re: non-condensable gas
Hi there,
non-condensable and excess refrigerant show exactly the same symptoms.
High discharge pressure and High sub-cooling.
By performing a test you can know which fault it is.
NON-CONDEMNSABLE TEST:
Pump-down the system and make sure the low pressure setting is low enough to evacuate the refrigerant from the evaporator. Turn on the condenser fans and let them run for at least 30min. If there is water cooled condenser then let the water flow.
Measure the air (water) inlet temp into the condenser and record it. With this temp go to the refrigerant pressure-temp table and find the corresponding pressure in gauge (not absolute). Now compare this pressure with the system discharge pressure.
If P(discharge-system) >> P(from table) then you have non-condensable.
If P(discharge-system) = P(from table) then you have excess refrigerant.
Remember : this test will not work unless the receiver and condenser are at the same place with the same temp.
Hope this helps.
CheersLast edited by lana; 15-03-2007 at 02:40 PM.
Even Einstein Asked Questions
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15-03-2007, 02:29 PM #6
Re: non-condensable gas
Hi Mallmk,
In the future please only post your question in one area. When you have multiple posts you have different areas where the questions are responded to and it makes it harder to follow the comments. Thanks.
Originally Posted by Mallmk
Originally Posted by MallmkIf all else fails, ask for help.