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9. Inspect all copper lines and control capillary tubing to
confirm that the lines are separated and not vibrating
against one another or the frame or housing.
10. Confirm all refrigeration lines are properly supported to
prevent vibration from causing premature failure of
copper piping.
11. Inspect all insulation on piping and control sensors.
Repair and replace as necessary.
12. Inspect entire plumbing system for leaks.
13. If equipped, inspect crankcase heaters to verify proper
operation.
14. Sample refrigerant to analyze for moisture or acid.
15. Inspect operating pressures and temperatures and
confirm the chiller has a full refrigerant charge.
Pump and Tank Maintenance Tasks
For chillers equipped with a tank and pump module,
additional maintenance steps are required at least every
six months:
1. Confirm that the pump, motor, and the immediate area
are clear of dirt, debris, leaves, animal nests, and so
forth.
2. Confirm pump mountings are secure and fasteners are
tight to prevent pipe movement and eventual failure.
3. Inspect pump for proper rotation.
4. Check pump for leaks and excessive noise while in
operation.
5. Lubricate pumps as recommended by the
manufacturer. Refer to the pump manufacturer's
operating and maintenance manual for lubricating
instructions, if any are required.
6. Test and record the motor amp draw under full load.
7. Test the pump overload protection device. Adjust if
necessary.
Maintenance Tasks
The maintenance tasks described herein present the basic,
minimal, steps required to successfully complete a task.
Local policies and protocols may require more elaborate
procedures with additional checks and inspections.
Inspection Methods
Appropriate inspection for modern chillers can be
described as hands on. Where possible and appropriate,
inspection should include touching the component or
apparatus. The sense of touch provides additional
feedback regarding temperature, texture, tightness, and
dryness that cannot match the visual inspection. Habitually
touching each item to be inspected also ensures that items
are not subconsciously skipped during the inspection
process. For a summary of tasks, see
ARTC-SVX008A-EN
Table 14, p.
58.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Critical Cleaning Tasks
Monitor temperature change and pressure drops across
the BPHE circuit to determine the frequency for strainer
cleaning. Monitor water quality in the chiller's closed
system to determine the optimum frequency for BPHE
cleaning.
On multiple module chillers, Trane provides service
isolation valves on each BPHE to isolate each strainer for
cleaning without disrupting the operation of any remaining
modules in the chiller.
Strainer Cleaning Procedure
Strainers at each BPHE are critical for protecting the small
water passages as well as maintaining fluid mixture
cleanliness. Service valves on the BPHE isolate each
strainer for cleaning without interrupting the operation of
other modules in the chiller bank. If a tank and pump
module is provided, pot strainers are occasionally included
on the pumps' suction lines.
NOTICE
Equipment Damage!
Failure to follow instructions could result in
equipment damage.
Do not operate without strainers in place.
1. De-energize power to the module containing the
strainer by turning the power OFF at the breaker and/or
disconnect (follow proper LOTO procedure).
2. Close the two service isolation valves between the
header and the BPHE.
Note: If this is a variable flow chiller, the outlet may be
equipped with an electronic valve that must be
manually locked in the closed position.
3. Remove the insulation to expose the roll grooved blind
end cap or service cap on the end of the strainer
housing. Utilize a short section of hose to connect to
the valve on the end cap to relieve pressure and
capture fluid. (Dispose of or re-utilize water/glycol
mixture according to local protocols.)
Maintenance Procedures
61
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