Refrigerant Coils; Coil Winterization; To Clean Refrigerant Coils - Trane CSAA Installation, Operation And Maintenance Manual

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 Chemicals!
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.
146
– 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!
Failure to do so could result in equipment 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.
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.
CLCH-SVX07K-EN