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Routine Maintenance
Refrigerant Coils
WARNING
Hazardous Pressures!
Failure to follow these safety precautions could result
in coil bursting, which could result in death or serious
injury. Coils contain refrigerant under pressure. When
cleaning coils, maintain coil cleaning solution
temperature under 150°F to avoid excessive pressure
in the coil.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
WARNING
Hazardous Pressures!
Failure to follow all safety instructions 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 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.
To clean refrigerant coils:
1. Disconnect all electrical power to the unit.
2. Wearing the appropriate personal protective equipment,
use a soft brush to remove loose debris from both sides of
the coil.
3. Install a block-off to prevent spray from going through the
coil and into a dry section of the unit and/or system
ductwork.
4. Mix a high-quality coil cleaning detergent with water
according to the manufacturer's instructions.
Note: If the detergent is strongly alkaline after mixing (PH 8.5
or higher), it must contain an inhibitor. Follow the
cleaning solution manufacturer's instructions
regarding the use of the product.
5. Place the mixed solution in a garden pump-up sprayer or
high-pressure sprayer. If a high pressure sprayer is to be
used:
– Maintain minimum nozzle spray angle of 15 degrees.
– Spray perpendicular to the coil face.
– Keep the nozzle at least 6 inches from the coil.
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– Do not exceed 600 psi.
6. Spray the leaving air side of the coil first, then the entering
air side.
7. Thoroughly rinse both sides of the coil and the drain pan
with cool, clean water.
8. Repeat steps 6 and 7 as necessary.
9. Straighten any coil fins damaged during the cleaning
process.
10. Confirm the drain line is open following the cleaning
process.
11. Allow the unit to dry thoroughly before putting it back into
service.
12. Replace all panels and parts and restore electrical power
to the unit.
13. Be careful any contaminated material does not contact
other areas of the unit or building. Properly dispose of all
contaminated materials and cleaning solution.
Coil Winterization
Water coil winterization procedures consist primarily of
draining water from the coil before the heating season. Trane
recommends flushing the coil with glycol if coils will be exposed
to temperatures below 35 degrees.
NOTICE
Coil Freeze-up!
Failure to follow instructions below could result in coil
damage. Drain and vent coils when not in use. Trane
recommends glycol protection in all possible freezing
applications. Use a glycol approved for use with
commercial cooling and heating systems and copper
tube coils.
Install field-fitted drains and vents to permit winterization of
coils not in use and to assist in evacuating air from the water
system during startup. If draining is questionable because of
dirt or scale deposits inside the coil, fill the coil with glycol
before the heating season begins.
Note: On many unit sizes, there are multiple coils in the coil
section. Be sure to winterize all coils in a given coil
section.
To winterize hydronic coils:
1. Remove the vent and drain plugs.
2. Blow the coil out as completely as possible with
compressed air.
3. Fill and drain the coil several times with full strength glycol
so that it mixes thoroughly with the water retained in the
coil.
4. Drain the coil out as completely as possible.
5. To ensure no water remains in the coil, do not replace the
vent and drain plugs until the coils are put back into service.
CLCH-SVX009L-EN
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