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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 ,
Recommended Heat Pump Service Intervals.
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 load heat exchanger circuit to determine the frequency
for strainer cleaning. Monitor water quality in the heat
pump's closed system to determine the optimum frequency
for heat exchanger cleaning.
On multiple module heat pumps, Trane provides service
isolation valves on each load heat exchanger to isolate
each strainer for cleaning without disrupting the operation
of any remaining modules in the heat pump.
Strainer Cleaning Procedure
Strainers at each load heat exchanger are critical for
protecting the brazed plate heat exchanger's small water
passages as well as maintaining water/glycol mixture
cleanliness. Service valves on the heat exchanger isolate
each strainer for cleaning without interrupting the operation
of other modules in the heat pump bank.
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.
2. Close the two service isolation valves between the
header and the heat exchanger.
Note: If this is a variable flow heat pump, 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
ARTC-SVX006A-EN
capture fluid. (Dispose of 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 tap water.
7. Clean the interior of the end cap (or service cap), and
the gasket using a soft natural bristle brush and tap
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 water/glycol make-up system is operational
to replenish the water/glycol 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.
Air Coil Cleaning Procedure
Fouling of air coil will result in a gradual decline in
performance of the heat pump and is particularly significant
during high ambient operation:
1. Turn off and "lock out" the power to the heat pump
module.
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.
2. Remove fan assembly to improve access to air coils.
3. Use a garden hose with spray nozzle or a long spray
wand with a 90° turn spray head. (DO NOT use a
pressure washer on air coils).
Note: If heat pump is equipped with EC-type fan motors,
remove the compressor-side V-baffle end cap,
instead.
Maintenance Procedures
51
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