Compressor Replacement-Tandem And Trio; Compressor Sets - Trane Start to Finish R-410A Installation Manual

oil to be drained out of the compressor. After the
refrigerant has been recovered, pressurize the
system with nitrogen to help remove oil from the
compressor.
• If the compressor is in a tandem or trio set, place
a catch pan under the oil equalizer Rotolock
connection on the compressor to catch the oil
from the oil equalizer tube or compressor when
the oil equalizer tube is removed.
– 090–181 Nominal Capacity Compressors
Note: For excess oil removal, the Schrader valve
in the lower part of the compressor shell
can be used. If more oil or the complete oil
charge needs to be removed, use the
following procedure.
• For 090–181 nominal capacity compressors, oil
removal requires using a suction or pump
device through the oil equalizer Rotolock fitting,
see Figure 14, p.
with clean oil prior to use.
• If the compressor is in a tandem set, place a
catch pan under the oil equalizer Rotolock
connection fitting on the compressor to catch
the oil from the compressor when the oil
equalizer tube is removed. Refer to
p. 19 for the location of the oil equalizer Rotolock
connection fitting.
Tip: Before removing the existing tubing from the
compressor, apply flux to the joint. This will aid in
the flow of the braze material and help keep the
joint clean for rebrazing. After fluxing, heat the joint
evenly to slightly higher temperature than the
melting temperature of the filler material. At this
point, the two parts of the assembly should be
easily separated.
• Refrigerant Connection Removal
– Single compressor—Cut the refrigerant lines in a
convenient location that allows reassembly with
slip couplings. Then, unbraze the line from the
compressor and reuse it when the replacement is
installed.
• When removing the compressor use both hooks
on the cap of the compressor with a spreader bar
(see Figure 12, p.
• The lifting device must be rated to handle the
weight compressor as listed in
Compressor Replacement—Tandem and
Trio Compressor Sets
Definitions:
• Tandem—Two compressors on a single refrigerant
circuit.
• Trio—Three compressors on a single refrigerant
circuit.
PART-SVN234B-EN
19. Flush the suction device
Figure 14,
19).
Table 4, p.
There are special considerations that are unique to
replacing compressors in a tandem or trio set:
1. Only replace the failed compressor.
2. On tandem or trio assemblies, the suction and
discharge lines must not be modified, except for the
use of slip-joint couplings. Other modifications 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 re-installation, reinstall lines to
compressor and reassemble the cut lines using a slip
coupling. Refer to
to cut the discharge and suction line.
Tip: Before removing the existing tubing from the
compressor, apply flux to the joint. This will aid in
the flow of the braze material and help keep the
joint clean for re-brazing. After fluxing, heat the
joint evenly to slightly higher temperature than the
melting temperature of the filler material. At this
point, the two parts of the assembly should be
easily separated.
3. Change oil in all compressors in the tandem or trio
compressors whenever there is a failure.
a. 182–361 Nominal Capacity—Use the oil charging
valve on the compressor.
b. 090–181 Nominal Capacity—Remove the oil
equalizer fitting and use a suction or pump device to
remove the oil from the compressor through the oil
equalizer tube opening. A suction type device
should be used to remove oil from the compressor.
Important: Some multiple compressor configurations
require a restrictor be placed in the suction
inlet to balance the oil levels. Refer to unit
Installation, Operation, and Maintenance
manual for correct size and location of
restrictor. The restrictors are packaged in a
bag with a label with the part number and
diameter required (see
The part number is X17311028010 and the
internal diameter in millimeters is Ø31. The
restrictor is also marked on the face with
both the extension number, last three digits
of the part number, and diameter. For the
previous example, the restrictor would be
marked 010-31. Without the proper
restrictor installed, the compressor oil level
19.
balance will not be correct.
Incorrect Restrictor Size and Location!
Failure to install the correct size restrictor or in the
correct position will lead to improper oil levels in the
compressor. This could result in a compressor failure
due to low oil level.
Removal and Installation
Figure 16, p. 20 for suggested area
Figure 18, p.
NOTICE
24).
23