Trane INTELLIPAK ™ ™ ™ ™ ™ Commercial Single-Zone Rooftop Air Conditioners with CV or VAV Control - Manual (Page 111)

109
Service & Maintenance (Continued)
CAUTION
Coil Cleaners!
Coil cleaners can damage roofs, surrounding buildings,
vehicles, etc. Cleaning substances should be checked
to ensure that they will not cause damage to surround-
ings. Coils and roof (if applicable) should berinsed thor-
oughly. Do not spray coil cleaners in windy conditions.
Refrigerant Coils
To clean refrigerant coils, use a soft brush and a sprayer
(either a garden pump-up type or a high-pressure sprayer).
A high-quality detergent is also required; suggested
brands include “SPREX A.C.”, “OAKITE 161”, “OAKITE
166” and “COILOX”. If the detergent selected is strongly al-
kaline (pH value exceeds 8.5), add an inhibitor.
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.
Failure of the drain pan 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 5-7 to determine the appropriate fin 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
Contains Refrigerant!
System contains oil and refrigerant under high pres-
sure. Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for refrigerant
type. Do not use non-approved refrigerants, refrigerant
substitutes, or refrigerant additives.
Failure to follow proper procedures or the use of non-ap-
proved refrigerants, refrigerant substitutes, or refriger-
ant additives could result in death or serious injury or
equipment damage.
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.
Note: 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. If a high-
pressure sprayer is used:
a. Do not allow the sprayer pressure to exceed 600
psi. The minimum spray nozzle angle is 15 degrees.
b. Spray the solution perpendicular (at 90 degrees) to
the coil face.
c. Maintain a minimum clearance of 6" between the
sprayer nozzle and the coil.
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 5-5 to determine the appropriate fin 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.