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NOTICE
Coil Damage!
High pressure water from a power washer can
damage and distort the cooling fins on the coil.
Using a pressure washer on condenser coils is not
recommended. Damaged fins can adversely affect
chiller efficiency.
4. Clean coils by spraying water in the opposite direction
of the air flow, from top of the coil to the bottom. Spray
in a consistent pattern to work the dirt and debris from
the top to the lower part of the coil.
5. For extremely dirty coils, chemical soaking may be
required to loosen debris build-up. Apply chemicals
with a hand-held pump sprayer following a similar
pattern used in the water cleaning.
6. Let the chemical mixture soak in the heat exchanger for
a short period of time to loosen sediment and scale
build-up. Trane recommends using straight tap water
except in extreme cases. (Take extra precautions by
covering electrical components with plastic bags, etc.)
7. After chemical cleaning, all surfaces must be flushed
thoroughly with clean water to remove residual
chemicals. Trace chemical residue may result in
premature aluminum fin breakdown and deterioration
requiring coil replacement.
8. Securely reinstall fan grill assembly (or V-baffle end
cap).
9. Turn power back on individual unit after ensuring all
electrical connections are wiped dry.
10. Confirm that each unit's panels are clean and clear of
debris.
Heat Exchanger Cleaning Procedure
Trane recommends using SWEP Goodway® Technologies
ScaleBreak-MP, an industrial biodegradable descaler
ARTC-SVX009A-EN
which will quickly and effectively dissolve calcium, lime,
rust and other water formed deposits from water cooled/
heated equipment.
•
When applying ScaleBreak-MP in your equipment, it
should be circulated through the water passages.
•
As the product comes in contact with the deposits, they
are dissolved into a liquid suspension.
•
Upon completion of the cleaning, the used solution is
freely flushed from the system along with the dissolved
deposits leaving no residual solution.
•
Optimal results are achieved when you pump into the
bottom of the equipment and out the top. This method
confirms the area to be cleaned was flooded, allowing
ScaleBreak-MP to come in contact with all the deposits.
Controller Tasks
Replace PLC Logic Controller
Prior to servicing the controller, verify that the power to the
heat pump is disconnected.
1. Remove all quick-connect black plugs and the one
orange plug (power supply 24 Vac).
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. The PLC logic controller is DIN rail-mounted. Once
plugs are removed, this will expose the gray secure
tabs on the bottom rear of the PLC.
3. Using a flathead screwdriver, insert screwdriver into the
slotted holes on the gray tabs and use downward force
to release PLC.
4. Remove the PLC by lifting the bottom out and then up,
off of the DIN rail.
5. Replace new controller in reverse fashion.
Note: On a multiple modular system with multiple PLC's, it
is imperative that the new PLC has the exact same
programming as the remaining PLC's or it will not be
compatible and would create havoc within the other
PLCs.
6. Energize power to the module by turning power ON at
the breaker and/or disconnect.
Maintenance Procedures
59
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