Cleaning Unit Interior/Exterior; Coil Cleaning - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

BELT RETAINING
CLIP
a39-2999
Fig. 171 — Detail of Belt Retaining Clip
and Segment Retained Latch
Fig. 172 — Detail of Belt Retaining Clip Location
Fig. 173 — Belt Removal
OTHER MAINTENANCE — Wheel drive motor bearings
are pre-lubricated and no further 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 set-
screw. The setscrew is secured with removable locktite to
prevent loosening. 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 ad-
justment is required. Inspect the drive belt annually for
SEGMENT RETAINER
LATCH
a39-3000
a39-3001
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 —
terior 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 —
rect expansion coils must be cleaned regularly to maintain peak
performance. Dirty coils can contribute to loss of cooling 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 commonly 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 commercial
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 mount-
ed 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 en-
tering airside, starting from the top of the coil and
working downward. Apply a mild non-foaming com-
mercial coil cleaner or detergent using a garden type
sprayer. Rinse coil gently with clean warm water,
avoiding high-pressure sprays, which can cause dam-
age 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 section 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 building if drain is plugged. If
coil section does not have a drain pan, it is recom-
mended that the coil be removed prior to cleaning.
6. Repeat Steps 1 through 5 as necessary.
7. Allow the coil to dry thoroughly before placing the
system back into operation. A clean dry cloth may be
186
Unit interior/ex-
CAUTION
Chilled water, hot water, steam, and di-
CAUTION