Carrier Aero 39MN Series, Инструкция по установке, запуску и обслуживанию

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OTHER MAINTENANCE
Wheel drive motor bearings are pre-lubricated and no further lu
-
brication 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 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 adjustment is re -
quired. Inspect the drive belt annually for proper tracking and ten -
sion. A properly tensioned belt will turn the wheel immediately af -
ter power is applied with no visible slippage during start-up.
Cleaning Unit Interior/Exterior
Unit interior/exterior 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.
Coil Cleaning
Chilled water, hot water, steam, and direct expansion coils must be
cleaned regularly to maintain peak performance. Dirty coils can
contribute to loss of cooling or heating capacity and efficiency, in -
creased operating costs, and compressor problems on direct ex -
pansion 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.
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 entering
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 pro -
cess. 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
recommended 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 sys -
tem back into operation. A clean dry cloth may be used to
wipe down the interior panels before placing the unit in
operation.
8. Using a fin rake, straighten any coil fins that may have
been bent or damaged during the cleaning process.
9. Replace all panels and parts that may have been removed
prior to cleaning and restore electrical power to the unit.
10. Use caution to assure that no contaminated materials con -
tact other areas of the unit or building. Properly dispose of
any polluted materials and cleaning fluids.
Winter Shutdown
It is recommended that auxiliary drain piping be added to coil pip -
ing if yearly winterizing of coils is anticipated. This auxiliary pip -
ing should be located at the highest and lowest point on the respec -
tive header connection for each coil.
ANTIFREEZE METHODS OF COIL PROTECTION
1. Close coil water supply and return valves.
2. Drain coil as follows:
Method I
— “Break” flange of coupling at each header
location. Separate flange or coupling connection to facili -
tate coil draining.
Method II
— Open both valves to auxiliary drain piping.
3. After coil is drained, Method I, connect line with a ser -
vice valve and union from upper nozzle to an antifreeze
reservoir. Connect a self-priming reversible pump be -
tween the low header connection and the reservoir. Meth -
od II, make connection to auxiliary drain valves.
4. Fill reservoir with any inhibited antifreeze acceptable to
code and underwriter authority.
5. Open service valve and circulate solution for 15 minutes;
then check its strength.
6. If solution is too weak, add more antifreeze until desired
strength is reached, then circulate solution through coil
for 15 minutes or until concentration is satisfactory.
CAUTION
Avoid washing unit electrical devices such as motors, starters,
electric heater control boxes, damper/valve actuators, sensors,
switches, relays, etc. as serious personal injury or damage to
the device could result.
Fig. 194 — Belt Removal
a39-3001
CAUTION
Follow all directions provided with the chemical cleaners to
avoid personal injury, injury to others, and/or coil damage.
Chemical coil cleaners may contain corrosive or harmful
agents.