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© 2016 Emerson Climate Technologies, Inc.
AE4-1303 R15
needs to be given to the oil line that connects the oil
sumps of the two compressors. For even tandems
(two compressors with equal capacities) there are two
options for connecting the compressor oil sumps--oil
equalization line (OEL) or two-phase tube line (TPTL).
For uneven tandems (two compressors with unequal
capacities) only the TPTL option is qualified.
After the compressors are mounted to the compressor
rails the entire assembly should be tilted back a minimum
of 12 degrees from horizontal (see
Figure 10
) to move
the oil level away from the Schrader fittings and sight-
glasses. If the compressor sumps are to be connected
with the TPTL the compressor sight-glasses can now
be removed for installation of the TPTL. The TPTL
Rotalock fitting should be torqued to the value listed in
Table 6
. If the compressor sumps are to be connected
with the OEL option the Schrader fittings can now be
removed by unscrewing them. Removing the Schrader
fittings exposes the stub that is used to braze the OEL to
each compressor.
The oil equalization stubs of both
compressors should be wiped clean with a lint free
towel to remove any oil residue before brazing.
For a detailed instruction list of how to assemble a trio
of compressors, please contact Application Engineering.
SERVICE PROCEDURES
CAUTION
POE oil must be handled carefully and the proper
protective equipment (gloves, eye protection, etc.)
must be used when handling POE lubricant. POE
must not come into contact with any surface or
material that might be harmed by POE, including
without limitation, certain polymers (e.g. PVC/CPVC
and polycarbonate).
Field Replacement
WARNING
Use care and the appropriate material handling
equipment when lifting and moving compressors.
Personal safety equipment must be used.
Mounting
There is an older 7 to 15 ton scroll family (ZR*K3) as well
as a reciprocating compressor family (BR) that can be
replaced by this scroll compressor family.
The mounting
dimensions of the older scroll and the reciprocating
compressor are 8.65" X 8.65" (220mm X 220mm) to the
center of the mounting holes. The newer scroll has a
mounting dimension of 7.5" X 7.5" (190mm X 190mm).
To help adapt to this new dimension use mounting
kit 922-0001-00 that contains an adaptor plate and
mounting bolts. It will bolt in place of the old compressor
mounts and has a 7.5" (190mm) square mounting bolt
hole pattern for the new compressor.
Removing Oil
If the oil level is higher than the oil Schrader fitting on
the sump of the compressor oil can be drained from
this fitting until the oil level reaches the level of the
Schrader fitting. To remove oil from the compressor
when the oil level is below the oil Schrader fitting
one of two different procedures can be used. The
first procedure is to remove the compressor from the
system and drain the oil from the compressor suction
connection. This method ensures complete removal
of the oil from the compressor. The second procedure
is to remove the compressor sight-glass and insert a
hose into the sump of the compressor and draw the
oil out with a hand-held pump (Yellow Jacket Pump
UPC#77930).
Electrical
When replacing a compressor, especially one that has
been in the field for a number of years, it is always a
good idea to replace the contactor.
Note: See the locked rotor on the nameplate of
the new compressor and make sure the contactor
exceeds this locked rotor rating.
Module
If the compressor to be replaced has a motor protection
module (i.e. ZR*K3) but the new compressor does not,
the following modifications must be made.
1. Entirely remove the wiring leads originally run to
(T1-T2) on the solid state module from the line
or transformer.
2. Either tie together the leads originally attached to
the control terminals (M1-M2) on the solid state
module, or remove the leads to M1-M2 and rerun
the control wiring directly from the control to the
contactor coil.
3. The only wiring connections to the new
compressor will be the three high-power leads.
