Routine Maintenance
74
CLCH-SVX013B-EN
Refrigerant Coils
WARNING
Hazardous Pressures!
Coils contain refrigerant under pressure. When cleaning
coils, maintain coil cleaning solution temperature
under 150°F to avoid excessive pressure in the coil.
Failure to follow these safety precautions could result in
coil bursting, which could result in death or serious
injury.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
WARNING
Hazardous Chemicals!
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. Failure to
follow all safety instructions could result in death or
serious injury.
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.
–
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!
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. Failure to do so could result in equipment
damage.
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.
Individual coil types determine how to properly winterize
the coil. To determine the coil type find the “Service Model
No of Coil” on the coil section nameplate. The coil type is
designated by the second and third digits on that model
number. For example, if the model number begins with
“DUWB,” the coil type is UW; if the model number begins
with “DW0B,” the coil type is W.
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 type D1, D2, WL, LL, UA, UW, UU, W, P2, P4,
P8, WD, 5D, and 5W coils:
1. Remove the vent and drain plugs.
2. Blow the coil out as completely as possible with
compressed air.
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