Other Maintenance; Cleaning Unit Interior/Exterior; Coil Cleaning - Carrier AERO 39MN Installation, Start-Up And Service Instructions Manual

BELT RETAINING
CLIP
a39-2999
Fig. 122 — Detail of Belt Retaining Clip
and Segment Retained Latch
Fig. 123 — Detail of Belt Retaining Clip Location
Fig. 124 — Belt Removal

OTHER MAINTENANCE

Wheel Drive Motor Bearings are pre-lubricated and no fur-
ther lubrication is necessary.
The Wheel Drive Pulley is secured to the drive motor shaft
by a combination of either a key or D-slot and setscrew. The
setscrew is secured with removable locktite to prevent loos-
ening. Annually confirm that the set screw is secure.
The Wheel Drive Belt is a urethane stretch belt designed to
provide constant tension through the life of the belt. No
SEGMENT RETAINER
LATCH
a39-3000
a39-3001
adjustment is required. Inspect the drive belt annually for
proper tracking and tension. A properly tensioned belt will
turn the wheel immediately after power is applied with no
visible slippage during start-up.
Cleaning Unit Interior/Exterior —
rior panels should be wiped down using a damp soft cloth or
sponge with a mixture of warm water and a mild detergent.
Avoid using an abrasive cleaner, as damage to the paint could
occur resulting in rust and corrosion. Chemicals such as paint
thinners can damage the painted panels and should be
avoided.
Avoid washing unit electrical devices such as motors, start-
ers, electric heater control boxes, damper/valve actuators,
sensors, switches, relays, etc. as serious personal injury or
damage to the device could result.
Coil Cleaning —
direct expansion coils must be cleaned regularly to maintain
peak performance. Dirty coils can contribute to loss of cool-
ing or heating capacity and efficiency, increased operating
costs, and compressor problems on direct expansion systems.
Dirt, grease, and other oils can also reduce the wettability of
the coil surfaces, which can result in moisture blow-off from
cooling coils and resulting water leakage problems. If the
grime on the surface of the coils becomes wet, which com-
monly occurs with cooling coils, microbial growth (mold)
can result, causing foul odors and health related indoor air
quality problems.
Coils can become dirty over a period of time, especially if
air filter maintenance is neglected. Coils should be inspected
regularly and cleaned when necessary. If coil fins become
dirty, pressure clean with hot water and detergent or a com-
mercial coil cleaner. Be sure to rinse coils thoroughly after
cleaning with chemical cleaners.
Follow all directions provided with the chemical cleaners
to avoid personal injury, injury to others, and/or coil dam-
age. Chemical coil cleaners may contain corrosive or harm-
ful agents.
1. Disconnect all electrical power to the air-handling unit,
including any separate power supplies for unit mounted
controls (actuators, sensors, etc.).
2. Wear the appropriate protective clothing (eyewear,
gloves, etc.).
3. Ensure there is sufficient access to the coil.
4. Use a vacuum with a soft tip brush to remove any dust
and loose debris from both sides of the coil.
5. Clean the leaving airside of the coil first, then the enter-
ing airside, starting from the top of the coil and working
downward. Apply a mild non-foaming commercial coil
cleaner or detergent using a garden type sprayer. Rinse
coil gently with clean warm water, avoiding high-pres-
sure sprays, which can cause damage to coil fins. Use a
block-off plate to prevent the water or chemical cleaner
from blowing through the coil and into a clean, dry sec-
tion of the unit. Confirm that the condensate drain line is
free of debris during and following the coil cleaning
process. Excess water from cleaning may result in
flooding the unit as well as causing damage to the build-
ing if drain is plugged. If coil section does not have a
drain pan, it is recommended that the coil be removed
prior to cleaning.
6. Repeat Steps 1 through 5 as necessary.
131
Unit interior/exte-
CAUTION
Chilled water, hot water, steam, and
CAUTION