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Evaporator Cleaning Procedure
Trane recommends using SWEP & Goodway®
Technologies ScaleBreak-MP, an industrial biodegradable
descaler 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
ensures the area to be cleaned was flooded, allowing
ScaleBreak-MP to come in contact with all the deposits.
Pump Tasks
The following section applies to those chillers/heat pumps
equipped with a tank and pump module.
Removing the Pump
1. Confirm module power is OFF by testing with known
operational voltmeter. Once confirmed, install lockout/
tagout equipment to ensure power is not turned on
while service work is being performed.
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 electrical access cover on the pump motor.
3. Remove all electrical wiring and flex conduit from the
pump. Make sure to notate all connection points for the
new installation.
ARTC-SVX010A-EN
Note: Be sure to document conductor/wire numbers
4. Close valves. There are isolation valves on the suction
and discharge sides of the pump as well as union
connections.
5. Using appropriate wrenches, slowly break loose the
union fittings at the suction and discharge piping.
Capture any escaping fluids encountered during the
pump change out process.
Notes:
•
Always use a second, counter, wrench, when
performing plumbing tasks to firmly hold the
fittings or joint while loosening or tightening.
•
A small quantity of fluid mixture will be lost
during this operation. Although propylene glycol
does not pose an environmental hazard, it is
the installers responsibility to adhere to local
codes and ordinances involving hazardous
fluids.
6. Loosen the four bolts that attach the pump base to the
frame with the appropriate size wrench or socket.
7. Remove the pump.
8. Disconnect the piping stubs from the suction and
discharge connections on the old pump to be reused on
the new pump.
Installing the Pump
Verify that power is disconnected from the chiller/heat
pump.
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.
1. When installing the stubs from the old pump, apply a
minimal amount of thread sealant to the threads of the
suction and discharge pipe adapters and install the
adapters onto the new pump.
2. Position the pump over the mounting holes. Apply anti-
seize compound to the four mounting bolts, washers,
and fittings before installation. Tighten fittings securely
with 1/2 inch socket and wrench.
Note: Do not over-tighten compressor mounting bolts as
the threaded inserts could strip out in the frame.
3. Loosely install the four mounting bolts onto the
mounting fittings on the chiller/heat pump frame.
4. Align the pump suction and discharge unions onto the
piping connections and hand tighten.
Maintenance Procedures
67
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