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Thread: initial 410a charging
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03-06-2008, 08:29 PM #1
initial 410a charging
Can anybody help me out, I need step by step instructions with as much detail as possible on charging a brand new trane 410a residential split a/c system. Any help would be greatly appreciated.
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03-06-2008, 09:15 PM #2
Re: initial 410a charging
Aren't they pre-charged?
1. Pressure/Strength test the installation.
2. Vacuum the system (Deep and Standing vacuum required as on modern refrigerant/oil)
3. Open up service valves (If outdoor unit is pre charged, otherwise this should have been done B4 1.)
4. Add additional charge as required.
NOTE: R410a needs to be charged in liquid form.
Good luck.
P.S. Should you require more information on the individual tasks, try searching this forum. These topics has been discussed to death here.Last edited by The Viking; 03-06-2008 at 09:17 PM.
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03-06-2008, 10:18 PM #3
Re: initial 410a charging
You could also read the manual provided with the unit.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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04-06-2008, 12:04 AM #4
Re: initial 410a charging
Viking, thanks for the help. I am not sure what is done with the system off and the system on. Obviously, pressure testing and deep vacuum is done with system off. Should system still be off when you open the pre-charge valves and weigh in the additional refrigerant required for the additional line set length?
I know system has to be on to check the pressure but if some additional refrigerant is needed do you do it with system on or off? Thanks a ton for your help
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04-06-2008, 12:27 AM #5
Re: initial 410a charging
>>Please note: I have no experience of installing Trane split systems<<
Assuming that you calculated the additional charge from a chart or formula, then the easiest way of getting it in to the system is when the system is under vacuum. Should you not be able to get all of the additional charge in before the system pressure equalised with your cylinder's pressure, then you will have to open the valves and start the unit up.
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04-06-2008, 01:07 AM #6
Re: initial 410a charging
Viking, thanks again, one last question, if you are charging with the system on, because r410a runs at such pressure won't the system force the refrigerant back into the 410a tank rather than the refrigerant going into the system?
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13-06-2008, 02:50 AM #7
Re: initial 410a charging
sounds like you got it from ebay or worse . you should call a proffessional
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13-06-2008, 04:12 PM #8
Re: initial 410a charging
The system must be off all time and in deep vacuum and you should use a recovery machine to charge independently of temperature/pressure gradient between equipment and vessel.
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13-06-2008, 08:53 PM #9
Re: initial 410a charging
Just after finishing the vacuum, charge refrigerant as a liquid into the *high side* with the compressor off until low side pressure approaches normal. (The air handler fan can be on at this point but not necessary.) Then close the high side gauge valve, open the low side gauge valve a little bit, and start the compressor.
Then finish by charging until the superheat or subcooling is correct. If charging by superheat, make sure all the vents are open, or it might result in an undercharge."If Hannah was an air handler, I would be a condensing unit so I could open her TXV and pump my refrigerant through her coils." - a HVAC friend of mine
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