Section 8. Refrigerant Line Leak Check; Section 9. Evacuation And Servicing - Trane A5AC5018A Installation And Operation Manual

Section 8. Refrigerant Line Leak Check

8.1 Check For Leaks
STEP 1 - Pressurize the refrigerant lines and
evaporator coil to 600 PSIG using dry nitrogen.
STEP 2 - Check for leaks by using a soapy
solution or bubbles at each brazed location.
Note: Remove nitrogen pressure and repair any
leaks before continuing.
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:
1. The minimum leak test pressure of the lineset and indoor coil shall be the high side design pressure, unless the
high side of the system, cannot be isolated from the low side of the system in which case the entire system
shall be pressure tested to the low side design pressure.
2. The test pressure after removal of pressure source shall be maintained for at least 1 hour with no decrease of
pressure indicated by the test gauge, with test gauge resolution not exceeding 5% of the test pressure.
Important: Under no circumstances shall potential sources of ignition be used in the searching for or detection of
refrigerant leaks.
Important: The following leak detection methods are deemed acceptable for all refrigerant systems:
• Electronic leak detectors calibrated for R454B
• Bubble method

Section 9. Evacuation and Servicing

9.1 Evacuate the Refrigerant Lines and Indoor Coil
Important: Do not open the service valves until
the refrigerant lines and indoor coil leak check
and evacuation are complete.
STEP 1 - Evacuate until the micron gauge reads
no higher than 350 microns, then close off the
valve to the vacuum pump.
STEP 2 - Observe the micron gauge. Evacuation
is complete, if the micron gauge does not rise
above 500 microns in one (1) minute and 1500
microns in ten (10) minutes.
STEP 3 - Once evacuation is complete, blank off
the vacuum pump and micron gauge, and close
the valve on the manifold gauge set.
88-A5AC5001-1A-EN
600 PSIG
0350
Microns
ON
OFF
1 MIN.
9