Compressor Service Pump Down Procedure; Oil Testing; Oil Level; Compressor Operational Pump Down - Trane CGAM Installation & Operation Manual

Maintenance
Table 73. Compressor fault indicators on protection
module (CSHN compressors only)
Fault LED on
PTC Overheat 40 ms
PTC Reset Delay
80 ms
Active
Phase Loss 500 ms
Wrong Phase
120 ms
Sequence
Note: Internal motor protection is not available on CHSD
compressors (10 and 13T sizes).

Oil Level

Oil should also be visible in the sight glass when the
compressor is running.When operating, each compressor
in a tandem or trio set may have a different oil level.
To check compressor oil level, refer to the label near the
compressor sight glass.The compressor(s) must be off.
Wait three minutes.With tandem or triple compressors the
oil level will equalize after shutdown. Compressor oil level
should be clearly visible within the sight glass when the
compressors are off.
Oil Fill, Removal and Capacity
The Model CSHN compressors have an oil charging valve
with a dip tube that goes to the bottom of the compressor.
This can be used to add or remove oil from the
compressor.
Model CSHD compressors have a Schrader valve in the
middle of the compressor which is used to add oil.To
remove oil from these compressors, the system
refrigerant charge must be removed and then the oil can
be removed using a suction style hand pump and tube in
the oil equalizer tube fitting. Oil can also be added to these
compressors through the oil equalizer tube fitting. Care
must be taken to prevent moisture from entering the
system when adding oil.
Compressor Oil Capacity
Important: Use onlyTrane OIL00080 (1 gallon). Do not
use any other POE oil.
Table 74. Oil capacity
Compressor Model Oil Capacity (pints)
CSHD 125, 161 7
CSHN 184 14.2
CSHN 250 15.2
CSHN 315 16.2
CSHN 374 17.2
CG-SVX17E-EN
LED off LED on LED off
460 ms 40 ms 460 ms
920 ms 80 ms 920 ms
500 ms 500 ms 500 ms
120 ms 120 ms 120 ms
NOTICE:
Equipment Damage!
Never reuse oil. Reusing oil could cause equipment
damage.

Oil Testing

UseTrane OilTesting Kit KIT06815 only for testing
lubricating oil in the Model CGAM chiller. Note that the
POE oil used in this product is very hygroscopic and easily
absorbs and retains moisture.The acceptable moisture
content is less than 100 ppm and acceptable acid level is
less than 0.5TAN. Note that refrigerant and moisture is
very difficult to remove from this oil using vacuum. Also
note that once the seal on a container of POE oil is opened,
the oil must be used.
In the event of a compressor failure, always test the oil with
an acid test kit to determine whether the compressor
failure was mechanical or electrical.This is important
because it dictates correct cleanup procedure.

Compressor Operational Pump Down

The operational pump down is used to manage the
refrigerant charge and prevent liquid slugging into the
compressors, oil dilution and oil starvation.The pump
down will be completed by the last operating compressor
in the refrigerant circuit and occurs during normal
shutdown conditions.The electronic expansion valve will
close.
The operational pump down sequence will end when:
• Saturated evaporator temperature drops below the
operational pump down set point
• Compressor pressure differential exceeds 348 psid
(Condensing Pressure - (Evaporator Pressure x 2.9)
• When the operational pump down time expires (60 x
(100/circuit capacity %))
• An immediate shutdown diagnostic occurs
• A pressure transducer fails
Compressor Service Pump Down
Procedure
The Service Pump down procedure is used to store the
Model CGAM refrigerant in the condenser.The condenser
is sized to hold the entire refrigerant charge.
Procedure:
• Select compressor to use for pump down.
• All chiller safeties remain in effect.
• Evaporator water flow must be proven
• Condenser fans operate normally
• Manually close refrigerant liquid line service valve
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