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5. Check the field made brazed connections for leaks.
For systems using flammable refrigerants, use the following
procedure:
After completion of field piping for split systems, the field
pipework shall be pressure tested with nitrogen and then
vacuum tested prior to refrigerant charging, according to
the following requirements:
Pressure test:
•
Using dry nitrogen, pressurize the field piping and
indoor coil to the lower of the maximum operating
pressures listed on the name plates of the indoor and
outdoor units (likely 600 psi).
•
The test pressure after removal of the pressure source
shall be maintained for at least one (1) hour with no
decrease of pressure indicated by the test gauge, with
the test gauge resolution not exceeding 30 psi.
•
Check for leaks by using a soapy solution at each field-
made joint.
Note: Remove nitrogen pressure and repair any leaks
before continuing.
About Trane and American Standard Heating and Air Conditioning
Trane and American Standard create comfortable, energy efficient indoor environments for residential applications.
For more information, please visit www.trane.com or www.americanstandardair.com
The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are
committed to using environmentally conscious print practices.
18-AH77D1-1A-EN 30 Nov 2023
Supersedes (New)
Vacuum test:
Important: Do not open the service valves until the
refrigerant lines and indoor coil leak check and evacu-
ation are complete.
•
Evacuate until the micron gauge reads no higher than
350 microns, then close off the valve to the vacuum
pump.
•
Observe the micron gauge. Evacuation is complete if
the micron gauge does not rise above 500 microns in
one (1) minute and 150 microns in ten (10) minutes.
•
Once evacuation is complete, blank off the vacuum
pump and micron gauge, and close the valve on the
manifold gauge set.
All procedures for charging the system with refrigerant shall
be according to the instructions provided by the manufac-
turer of the outdoor unit.
Important: Under no circumstances shall potential sources
of ignition be used in the searching for or detection of refrig-
erant leaks.
After charging the system, all indoor field-made joints of
the field piping shall be checked for refrigerant leaks using
an electronic leak detector calibrated for R-454B having a
sensitivity of 5 grams per year or better.
© 2023
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