Trane 5TWA4 - Section 8. Refrigerant Line Leak Check; Section 9. Evacuation and Servicing

8 18-BC120D1-1A-EN
3-4” from valve
STEP 1 STEP 2 STEP 3
STEP 4 STEP 5
Section 8. Refrigerant Line Leak Check
8.1 Check For Leaks
After completion of eld piping for split systems, the eld pipework shall be pressure tested with nitrogen and then
vacuum tested prior to refrigerant charging.
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 R-454B (with a sensitivity of 5 grams/year).
Important: The outdoor unit should not be tested higher than 450 psig for servicing or component replacement.
The indoor unit and linesets should be tested to the max pressure specied on the outdoor or indoor unit
nameplate. The service valves should be closed when pressure testing the evaporator coil and linesets to separate
the outdoor unit from the indoor unit.
STEP 1 (Final Pressure Check) - Isolate the outdoor unit from the evaporator coil and linesets using the service
valves. Pressurize the evaporator coil and linesets to the max pressure specified on the outdoor or indoor unit
nameplate for a minimum of 60 minutes. Do not add additional refrigerant or test gas after reaching the evaporator
coil specified pressure. The system should show no loss of pressure once pressurized. Once the pressure test is
complete follow the steps for evacuation.
*OPTIONAL (Preliminary Pressure Check) - Pressurize the refrigerant lines and evaporator coil to 150 PSIG
using dry nitrogen. Check for leaks by using a soapy solution or bubbles at each brazed location. Remove pressure
and repair any leaks before continuing.
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.
0350
Microns
ON
OFF
Section 9. Evacuation and Servicing
9.1 Evacuate the Refrigerant Lines and Indoor Coil