Trane IntelliPak WEHE Series Installation, Operation And Maintenance Manual page 114

Coil Cleaning
Regular coil maintenance, including annual cleaning—
enhances the unit's operating efficiency by minimizing:
– compressor head pressure and amperage draw;
– water carryover;
– fan brake horsepower; and,
– static pressure losses.
At least once each year—or more often if the unit is located
in a "dirty" environment—clean the evaporator and
condenser coils using the instructions outlined below. Be
sure to follow these instructions as closely as possible to
avoid damaging the coils.
Refrigerant Coils
To clean refrigerant coils, use a soft brush and a garden
pump-type sprayer. A high-quality mild detergent is also
required. If the detergent selected is strongly alkaline (pH
value exceeds 8.5), add an inhibitor (contact your local
Trane Parts Center for appropriate detergents). Spray the
detergent on the complete surface of the coil, let stand for
5 minutes and thoroughly rinse with high volume low
pressure sprayer. Clean the coil from the inside out, top
down for best results
1. Remove the access panels on both sides of the unit and
the filters.
WARNING
No Step Surface!
Do not walk on the sheet metal drain pan. Walking on
the drain pan could cause the supporting metal to
collapse, resulting in the operator/technician to fall.
Failure to follow this recommendation could result in
death or serious injury.
Note: Bridging between the unit's main supports may
consist of multiple 2 by 12 boards or sheet metal
grating.
2. Straighten any bent coil fins with a fin comb. (Use the
data in Table 38, p. 102
comb size.)
3. Mix the detergent with water according to the
manufacturer's instructions. If desired, heat the
solution to 150°F maximum to improve its cleansing
capability.
WARNING
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.
RT-SVX35H-EN
to determine the appropriate fin
Important: Refrigerant oil is detrimental to some
roofing materials. Care must be taken to
protect the roof from oil leaks or spills.
4. Pour the cleaning solution into the sprayer.
5. 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.
6. Rinse both sides of the coil with cool, clean water.
7. Inspect both sides of the coil; if it still appears to be
dirty, repeat Steps 7 and 8.
8. Reinstall all of the components and panels removed in
Step 2; then restore power to the unit.
Steam or Hot Water Coils
To clean a steam or hot water coil, use a soft brush, a
steam-cleaning machine, and water.
1. Verify that switches 1S1 and 1S70 are turned "OFF",
and that the main unit disconnect is locked open.
2. Remove enough panels and components from the unit
to gain sufficient access to the coil.
3. Straighten any bent coil fins with a fin comb. (Use the
data in Table 36, p. 101
comb size.)
4. Remove loose dirt and debris from both sides of the
coil with a soft brush.
5. Use the steam-cleaning machine to clean the leaving-
air side of the coil first; start at the top of the coil and
work downward; then clean the entering-air side of the
coil, starting at the top of the coil and working
downward.
6. Check both sides of the coil; if it still appears dirty,
repeat Step 5.
7. Reinstall all of the components and panels removed in
Step 2; then restore power to the unit.
Service & Maintenance
to determine the appropriate fin
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