RT-SVX34V-EN
79
• Fan brake horsepower
• Static pressure losses
At least once each year—or more often if the unit is located
in a “dirty” environment—clean the evaporator,
microchannel condenser, and reheat coils using the
instructions outlined below. Be sure to follow these
instructions as closely as possible to avoid damaging the
coils.
WARNING
Hazardous Chemicals!
Failure to follow this safety precaution could result in
death or serious injury. Coil cleaning agents can be
either acidic or highly alkaline and can burn severely
if contact with skin or eyes occurs.
Handle chemical carefully and avoid contact with
skin. ALWAYS wear Personal Protective Equipment
(PPE) including goggles or face shield, chemical
resistant gloves, boots, apron or suit as required. For
personal safety refer to the cleaning agent
manufacturer’s Materials Safety Data Sheet and follow
all recommended safe handling practices.
Refrigerant Coils
To clean refrigerant coils, use a soft brush and a sprayer.
Important: DO NOT use any detergents with microchannel
condenser coils. Pressurized water or air
ONLY.
For evaporator and reheat coil cleaners, contact the local
Trane Parts Center for appropriate detergents.
1. Remove enough panels from the unit to gain safe
access to coils.
a. For the 50 ton unit with the 3rd coil closest to the
bulk-head, safe access can be gained by removal
of the unit side panels.
b. For the 40 ton and 50 ton units, access to the 2-row
microchannel condenser coils removal of the corner
posts will be necessary.
WARNING
No Step Surface!
Failure to follow instruction below could result in
death or serious injury.
Do not walk on the sheet metal drain pan. Walking
on the drain pan could cause the supporting metal
to collapse and result in the operator/technician
falling.
Note: Before attempting to enter the unit, bridge
between the main supports. Bridging may
consist of multiple 2 by 12 boards or sheet
metal grating.
2. Straighten any bent coil fins with a fin comb.
3. For accessible areas, remove loose dirt and debris
from both sides of the coil. For dual row microchannel
condenser coil applications, seek pressure coil wand
extension through the local Trane Parts Center.
4. When cleaning evaporator and reheat coils, 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.
Important: DO NOT use any detergents with
microchannel coils. Pressurized water or
air ONLY.
5. Pour the cleaning solution into the sprayer. If a high-
pressure sprayer is used:
a. The minimum nozzle spray angle is 15 degrees.
b. Do not allow sprayer pressure to exceed 600 psi.
c. Spray the solution perpendicular (at 90 degrees) to
the coil face.
d. For evaporator and reheat coils, maintain a
minimum clearance of 6" between the sprayer
nozzle and the coil. For microchannel condenser
coils, optimum clearance between the sprayer
nozzle and the microchannel coil is 1"-3”.
6. Spray the leaving-airflow side of the coil first; then
spray the opposite side of the coil. For evaporator and
reheat coils, 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; then restore power to the unit.
10. For evaporator and reheat coils, use a fin comb to
straighten any coil fins which were inadvertently bent
during the cleaning process.
Microchannel Condenser Coil Repair and
Replacement
If microchannel condenser coil repair or replacement is
required, refer to General Service Bulletin RT-SVB83*-EN
for further details.
Final Process
Record the unit data in the blanks provided.
Maintenance
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