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WC-IOM-7 • Packaged Heat Pump 45
Maintenance
ƽWARNING
Hazardous Pressures!
Coils contain refrigerant under pressure. When cleaning coils, maintain coil
cleaning solution temperature under 150°F to avoid excessive pressure in the
coil. Failure to follow these safety precautions could result in coil bursting, which
could result in death or serious injury.
Do not heat the detergent-and-water solution above 150° F. Hot liquids sprayed
on the exterior of the coil will raise the coil’s internal pressure and may cause it to
burst. Failure to follow proper procedures can result in personal illness or injury
or severe equipment damage.
5. 5. Pour the cleaning solution into the sprayer. If a high-pressure sprayer is
used:
a. do not allow sprayer pressure to exceed 600 psi.
b. the minimum nozzle spray angle is 15 degrees.
c. maintain a minimum clearance of 6" between the sprayer nozzle and the
coil.
d. spray the solution perpendicular (at 90 degrees) to the coil face.
6. Spray the leaving-airflow side of the coil first; then spray the opposite side of
the coil. Allow the cleaning solution to stand on the coil for five minutes.
7. Rinse both sides of the coil with cool, clean water.
8. Inspect both sides of the coil; if it still appears to be dirty, repeat Steps 6 and
7.
9. Reinstall all of the components and panels removed in Step 1 and any
protective covers installed in step 2.
10. Restore the unit to it’s operational status and check system operation.
Final Process
For future reference, you may find it helpful to record the unit data requested
below in the blanks provided.
(1) Complete Unit Model Number:
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(2) Unit Serial Number:
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(3) Wiring Diagram Numbers (from unit control panel):
— schematic(s)
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