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Liquid and Suction connections are both braze type, make sure to
brazing, failure to do so could damage the seals within the service valves causing refrigerant loss.
1)
Connect a suitable R410A refrigerant manifold to
2)
Carry out a complete pressure test using suitable Oxygen Free Nitrogen, (OFN) in accordance
with current F-Gas regulations and in-line with IOR Good Refrigerant Practices.
It is recommended to apply a pressure of 3Bar, for 5 minutes or more, increase the
pressure to 15Bar and hold for 5 minutes or more, this will detect serious leaks.
Increase the pressure over a period of time to 41.5Bar, holding this pressure for a period of 24 hours.
If environmental temperatures change during the testing period, pressures could change by approx 0.1Bar (1.4PSIG) per 1
3)
Close off the manifold gauge valves and disconnect the OFN cylinder.
4)
Replace the OFN cylinder with a suitably sized vacuum pump (6cfm or better).
5)
Evacuate the system to the best vacuum, weather conditions will allow, ideally between 2 Torr
(2.7mb) to 4 Torr (5.5mb), with a duration of 2 to 3 hours
6)
Once a suitable vacuum has been achieved, remove the vacuum pump, leaving the manifold
gauge connected and let the system stand for 1 hour or more, checking the vacuum gauge if
there is no loss move on, if there is a pressure loss, identify the potential cause, rectify
and repeat.
7)
Replace the vacuum pump with suitable virgin R410A refrigerant cylinder/s.
8)
Charge the system with the calculated quantity of virgin R410A refrigerant.
Calculations and relevant correction charts can be found further on in this guide.
Cool Designs Ltd makes every effort to ensure that the information provided within this publication is correct and error free, however we cannot guarantee that it is free of inaccuracies,
errors or omissions. Users should seek to clarify this information for themselves prior to basing any decisions upon such information.
"WET
RAG" the service valves whilst
fig 6
BOTH
service valves, Liquid and Suction.
-3-
C.
o
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