PKGP-SVX011A-EN
37
terminal connections, as well as damaged wire
insulation. Make any necessary repairs.
•
Verify that the electric heat system operates properly.
Coil Cleaning
Regular coil maintenance, including annual cleaning,
enhances the unit’s operating efficiency by minimizing the
following:
•
Compressor head pressure and amperage draw
•
Evaporator water carryover
•
Fan brake horsepower
•
Due to increase static pressure losses
•
Airflow reduction
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.
At least once each year, or more often if the unit is located
in a “dirty” environment, clean the condenser coils using
the instructions outlined below. Be sure to follow these
instructions as closely as possible to avoid damaging the
coils.
Note:
For units equipped with hail guards follow removal
procedure listed below.
Hail Guard Removal
•
Remove shipping screws (ones without washers).
•
Lift hail guards up so screws with washers go to top of
keyhole.
•
Remove hailguard by sliding washer head screw
through keyhole.
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 alkaline (ph
value exceeds 8.5), add an inhibitor.
Coil Cleaning Procedure
1. Remove enough panels from the unit to gain access to
the coil. Remove the access panel from the roof located
next to the rear condenser fan.
2. Protect all electrical devices such as motors and
controllers from any over spray.
3. Straighten any bent coil fins with a fin comb.
4. 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!
Failure to follow instructions below could result in a
violent explosion, which could result in death or
serious injury.
If a heat source is required to raise the tank pressure
during removal of refrigerant from cylinders, use only
warm water or heat blankets to raise the tank
temperature. Do not exceed a temperature of 150°F.
Do not under any circumstances apply direct flame to
any portion of the cylinder.
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. 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.
Hail Guard Reinstallation
Reinstall hail guards by aligning the keyholes over the
washer screw heads, and slide into place. If your
installation requires seismic or special wind load
compliance, reinstall shipping screws.
