R407c PSI or KPA???

[luke.180]

Sorry If this has been talked about before but its doing my head in.
I cant seem to find on the net wat PSI or KPA a r407c unit works on, because ive had to charg 2 units and im charging them at 55-60 psi is that correct or am i doing it wrong??

Thanx

[BritCit_Juve]

It depends on the application and ambient / room conditions.
you would usually be looking at a 60si suction and 280psi head in the UK assuming condensing at around 45°C. Depending on which part you would be operating a bit higher condensing around 55°C so the head pressure and evaporating pressure would also rise.
It is better to charge to the manufacturers charge weight if available.
Brit

[luke.180]

thanx mate

[nike123]

Sorry If this has been talked about before but its doing my head in.
I cant seem to find on the net wat PSI or KPA a r407c unit works on, because ive had to charg 2 units and im charging them at 55-60 psi is that correct or am i doing it wrong??

Thanx

Don't charge by pressure! Charge by weight stated at outdoor unit and, if necessary, add more refrigerant for length of pipes longer then initial charge is sufficient for (usually if length is more then 5m).

Do not top up R 407C if you have less than 80-90% of original charge remained in system (weigh charge after recovery). If you have less of that, then you must remove old and add new virgin refrigerant.

If you need to charge refrigerant in system then you must first find leak with electronic leak detector, then recover remained refrigerant and then weigh recovered refrigerant.
Or you could recover refrigerant and find leak by nitrogen and soap bubbles. Then you could repair leak and pressure test for tightness.

Only then you could return recovered refrigerant and top up until you meet required weight.

Pressures depends about air temperatures,and quantity of air which varies by indoor , outdoor conditions and settings at conditioner and therefore could not be given as reference value.