Scroll Compressor Replacements - Trane IntelliPak Installation, Operation And Maintenance Manual

NOTICE:
Compressor Damage!
In order to prevent compressor damage, you MUST
follow recommendations below:
Important: 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.
• For the initial charging with the compressors off;
charging to the liquid line is required to minimize
starting the compressors with liquid refrigerant in the
compressor oil sump.
• If suction line charging is needed to complete the
charging process, only do so with the compressor
operating.
• Allow the crankcase heater to operate a minimum of 8
hours before starting the unit.
Compressor Oil
The appropriate oil charge for a 7.5 ton scroll compressor
is 6.3 pints. For 9 through 15 ton light commercial scroll
compressors is 7 pints. For a 15, 20 and 25 ton large
commercial scroll compressors (75 ton units), use 14.2
pints. Variable speed VZH117 oil charge is 7.6 pints and
VZH170 is 14.2 pints.
Remove and measure oil from any compressor replaced.
Adjust oil in replacement compressor to prevent excessive
oil in system.

Scroll Compressor Replacements

Discoloration of the oil indicates that an abnormal
condition has occurred. If the oil is dark and smells burnt,
it has overheated because of: compressor operating at
extremely high condensing temperatures; high superheat;
a compressor mechanical failure; or, occurrence of a motor
burnout.
If a motor burnout is suspected, use an acid test kit
(KIT15496) to check the condition of the oil.Test results will
indicate an acid level has exceeded the limit if a burnout
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 acidic. If a motor burnout has
RT-SVX36K-EN
occurred, change the oil in both compressors in a tandem
set.
CSHD Compressors (20-70 & 80 Ton)
For CSHD compressors this will require that the oil be
removed using a suction or pump device through the oil
equalizer Rotolock fitting, see
device for removing oil. It is good practice to flush the
suction device with clean oil prior to use.
Place a catch pan under the oil equalizer Rotolock
connection fitting on the compressor to catch the oil that
will come out of the compressor when the oil equalizer
tube is removed from the compressor.
Prior to reinstalling the oil equalizer line to each
compressor, replace the PTFE gasket on the oil equalizer
Rotolock fitting on each compressor. See
p. 174.Torque Rotolock nut to the values listed in
p. 174.
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.
CSHN Compressors (75 & 89-130 Ton)
CSHN compressors have an oil drain valve, See
Figure 133, which allows the oil to be drained out of the
compressor. After the refrigerant has been recovered,
pressurize the system with nitrogen to help remove the oil
from the compressor.
Figure 131. CSHD
Maintenance
Figure 131. Use a dedicated
Figure 132,
Table 76,
173