Specifications

JOHNSON CONTROLS
21
FORM ET102.19-NOM1 (809)
5. Use a steam-cleaning machine, starting from the
top of the coil and working downward. Clean the
leaving airside of the coil rst, then the entering
airside. Use a block-off to prevent steam from
blowing through the coil and into dry sections of
the unit.
6. Repeat step 5 as necessary.
7. Conrm that the drain line is open following the
cleaning.
8. Allow the unit to dry thoroughly before putting the
system back in service.
9. Straighten any coil fins that may have been
damaged during the cleaning process with a n
comb.
10. Replace all panels and parts and restore electrical
power to the unit.
11. Use caution to assure that any contaminated ma-
terial does not contact other areas of the unit or
building.
Properly dispose of all contaminated
materials and cleaning solutions.
Refrigerant Coils
Refrigerant coils should be kept clean to maintain
maximum performance. If ns become dirty, clean with
cold water and detergent, or one of the commercially
available chemical coil cleaners. Rinse coils thoroughly
after cleaning.
1. Follow steps 1-4 from Steam and Water Coil clean-
ing procedure preceding.
2. Mix a high quality coil cleaning detergent with wa-
ter accordance to the manufacturer’s instructions.
If the detergent is strongly alkaline after mixing
(pH 8.5 or higher), it must contain an inhibitor.
Carefully follow the detergent manufactures in-
structions on the use of the product.
3. Place the mixed solution in a garden sprayer or
high-pressure sprayer. If a high pressure sprayer
is used note the following:
• Maintain a minimum nozzle spray angle of
15 degrees.
• Spray perpendicular to the coil face.
• Protect other areas of the air handler and
internal controls from contact with moisture
or the cleaning solution.
• Keep the nozzle at least 6 inches from the
coil.
• Do not exceed 600 psi.
4. Spray the leaving airside of the coil rst, then the
entering airside. Use a block-off to prevent spray
from going through the coil and into dry sections
of the unit and/or system ductwork. Carefully fol-
low the cleaning solution manufacturer’s usage
instructions.
5. Thoroughly rinse both sides of the coil and the
drain pan with cool, clean water.
6. Repeat steps 4 and 5 as necessary.
7. Straighten any coil fins that may have been
damaged during the cleaning process with a n
comb.
8. Conrm that the drain line remains open following
the cleaning process.
9. Replace all panels and parts and restore electrical
power to the unit.
10. Use caution to assure that any contaminated ma-
terial does not contact other areas of the unit or
building.
Properly dispose of all contaminated
materials and cleaning solutions.
Winterizing Water Coils
Due to air stratication, failure of outdoor air dampers
and/or preheat controls, coil freeze-up can occur.
Scheduled draining of water cooling coils for winter
shutdown cannot be depended upon as insurance
against interior tube freezeup. Freeze-up will result in
severe coil damage. It is recommended that all coils be
drained as thoroughly as possible and then treated in
the following manner.
Fill each coil independently with an anti-freeze solution
using a small circulating pump and again thoroughly
drain. Check freezing point of anti-freeze before
proceeding to next coil. Due to a small amount of
water always remaining in each coil, there will be a
diluting effect. The small amount of anti-freeze solution
remaining in coil must always be sufcient enough to
prevent freeze-up.