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Maintenance Procedures
11. Inspect all insulation on piping and control sensors.
Repair and replace as necessary.
12. Inspect entire plumbing system for leaks.
13. Review logged alarms and look for repetitive trends.
14. If equipped, inspect crankcase heaters to verify proper
operation.
15. Sample refrigerant to analyze for moisture or acid.
16. Inspect operating pressures and temperatures and
ensure the chiller/heat pump has a full refrigerant
charge.
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 chiller/heat pumps can
be described as "hands on." Where possible and
appropriate, visual inspection should include touching the
component or apparatus being inspection. The sense of
touch provides additional feedback regarding temperature,
texture, tightness, and dryness that "eyes only" inspection
cannot match. 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
Table 19, p.
63.
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 brazed plate heat exchanger (BPHE) circuit to
determine the frequency for strainer cleaning. Monitor
water quality in the chiller/heat pump's closed system to
determine the optimum frequency for BPHE cleaning.
On multiple module chiller/heat pumps , 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/heat pump.
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
66
strainer for cleaning without interrupting the operation of
other modules in the chiller/heat pump 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 or re-utilize water/glycol mixture
according to local protocols.
CAUTION
Explosion Hazard!
Failure to relieve pressure gradually could result in
minor to moderate injury and equipment damage.
Water/glycol mixture can be under considerable
hydraulic pressure in the strainer housing. Close
isolation valves fully. Relieve pressure using a boiler
vale. Use extreme care to slowly remove the end cap
and release pressure gradually.
4. Inspect the gasket and service cap for abrasions, tears,
excessive dirt, or deterioration. Replace gasket if
necessary.
5. Remove the strainer from the housing.
6. Clean the strainer inside and out using a soft natural
bristle brush and water.
7. Clean the interior of the end cap (or service cap), and
the gasket using a soft natural bristle brush and water.
Apply a light coating of lubrication to the gasket.
8. Re-install the strainer in the housing (large end first).
Replace the gasket and end cap and tighten coupling
collar securely.
9. Ensure the fluid make-up system is operational to
replenish the fluid mixture lost during the cleaning
process.
10. Energize power to the module containing the strainer
by turning power ON at the breaker and/or disconnect.
ARTC-SVX010A-EN
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