Charge Storage; Compressor Oil; Compressor Replacements; Electrical Phasing - Trane Voyager Commercial Installation, Operation And Maintenance Manual

M M a a i i n n t t e e n n a a n n c c e e
I I m m p p o o r r t t a a n n t t : : Do Not release refrigerant to the
atmosphere! If adding or removing
refrigerant is required, the service
technician must comply with all federal,
state, and local laws.
• To prevent cross contamination of
refrigerants and oils, use only dedicated
R-410A service equipment.
• Disconnect unit power before
evacuation and do not apply voltage to
compressor while under vacuum.
Failure to follow these instructions will
result in compressor failure.
• Due to the presence of POE oil,
minimize system open time. Do not
exceed 1 hour.
• When recharging R-410A refrigerant, it
should be charged in the liquid state.
• The compressor should be off when the
initial refrigerant recharge is performed.
• Charging to the liquid line is required
prior to starting the compressor to
minimize the potential damage to the
compressor due to refrigerant in the
compressor oil sump at startup.
• If suction line charging is needed to
complete the charging process, only do
so with the compressor operating. Do
not charge liquid refrigerant into the
suction line with the compressor off!
This increases both the probability that
the compressor will start with
refrigerant in the compressor oil sump
and the potential for compressor
damage.
• Allow the crankcase heater to operate a
minimum of 8 hours before starting the
unit.

Charge Storage

Due to the reduced capacity of the microchannel
condenser coil compared to the round tube plate fin
evaporator coil, pumping refrigerant into the
condenser coil to service the refrigerant system is no
longer an option.

Compressor Oil

If a motor burn out is suspected, use an acid test kit to
check the condition of the oil. Test results will indicate
an acid level has exceeded the limit if a burn out
occurred. Oil test kits must be used for POE oil
(OIL00079 for a quart container or OIL00080 for a gallon
container) to determine whether the oil is acid.
If a motor burn out has occurred, change the oil in both
compressors in a tandem set. This will require that the
oil equalizer tube be removed to suck the oil out of the
124
oil sump. A catch pan must be used to catch the oil
when the compressor oil equalizer line is loosened.
N N o o t t e e : : Refrigerant oil is detrimental to some roofing
materials. Care must be taken to protect the roof
from oil leaks or spills.
Charge the new oil into the Schrader valve on the shell
of the compressor. Due to the moisture absorption
properties of POE oil, do not use POE oil from a
previously opened container. Also discard any excess
oil from the container that is not used.
Compressor model
CSHD075-161
CSHD183
CSHN250

Compressor Replacements

Electrical Phasing

If it becomes necessary to replace a compressor, it is
very important to review and follow the Electrical
Phasing procedure described in the startup procedure
of this manual.
If the compressors are allowed to run backward for
even a very short period of time, internal compressor
damage may occur and compressor life may be
reduced. If allowed to run backwards for an extended
period of time the motor windings can overheat and
cause the motor winding thermostats to open. This will
cause a "compressor trip" diagnostic and stop the
compressor.
If a scroll compressor is rotating backwards, it will not
pump and a loud rattling sound can be observed.
Check the electrical phasing at the compressor terminal
box. If the phasing is correct, before condemning the
compressor, interchange any two leads to check the
internal motor phasing.

Precision Suction Restrictor

Tandem manifold compressors that have unequal
capacity sizes use a precision suction restrictor to
balance the oil levels in the compressors (see figure
below). This restrictor is placed in the smaller capacity
compressor. When replacing this compressor, it is
imperative that the proper restrictor is selected from
those provided with the replacement compressor.
When the compressors are restarted, verify that correct
oil levels are obtained with both compressors
operating.
Oil amount
7.0 pts
7.6 pts
14.2 pts
RT-SVX34R-EN