Repair Recommendations; Mechanical Failure - Trane Start to Finish R-410A Installation Manual

General Information
Figure 15. Tandem and Trio
TANDEM
Oil equalizer lines
TRIO

Repair Recommendations

WARNING
Hazard of Explosion and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury. 
Never solder, braze or weld on refrigerant lines or any
unit components that are above atmospheric pressure
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.

Mechanical Failure

Replace only the failed compressor in a tandem or trio set.
Important: On tandem or trio assemblies, the suction
and discharge lines must NOT be modified,
except for the use of slip joint couplings.
20
Figure 16. Suggested areas to cut refrigerant lines
Oil equalizer Rotolock
connection fitting
Minimize system and compressor open times to avoid
excessive moisture absorption by the POE oil. Maximum
suggested open time is 15 minutes.
Drain and replace oil in all the non-failed compressors.
Note: For 090–181 nomnial capacity compressors, this
The 182–361 nominal capacity compressor has an oil drain
with a Schrader
(see
Replace unit liquid line filter-drier. This is a very important
part of controlling moisture in R-410A POE oil systems.
Reuse the compressors mounting isolators or mounting
spacers that are used with the existing compressor
assembly.
Braze the compressor into the system. Compressor
connections are copper-plated steel. Use BAg-28, 40%
silver, with paste flux to make the copper tube connections
to the compressor.
Other modification may cause oil return
issues and lead to compressor failure. Cut
the lines in a convenient place, remove the
compressor, and then unbraze the lines
from the compressor. On reinstallation,
reinstall lines to compressor and
reassemble the cut lines utilizing a slip
coupling. See Figure 16
to cut the discharge and suction line.
Suggested area to cut the
refrigerant lines so that
they can be reinstalled
requires removing oil using a suction device
through the oil equalizer Rotolock fitting (see
Figure 14, p. 19). Use a dedicated device for
removing oil. It is good practice to flush the suction
device with clean oil prior to use.
®
valve that can be used to remove the oil
Figure 13, p. 19).
for suggested area
PART-SVN234B-EN