AAON CA-25 - Manual (Page 8)

8
AAON Coil Products
CA COOLING UNITS
•
INSTALLATION
AND
OPERATION MANUAL
AAON Coil Products, Inc.
203 Gum Springs Road
Longview, Texas U.S.A 75602
ph: 903-236-4403 • fax: 903-236-4463
P84510 • (Rev A) 11-98 (ACP 27230)
SERVICING, TROUBLE SHOOTING AND MAINTENANCE
In the event the unit cannot be made to function
correctly, it is strongly recommended that only ser-
vicemen who are well qualified and experienced in
heating and air conditioning be permitted to service
the systems.
GENERAL LUBRICATING INSTRUCTIONS
All original condensing unit motors and fan bearings
REQUIRE NO LUBRICATION.
COIL INFORMATION
The condenser coil(s) MUST BE KEPT CLEAN.
This will reduce electrical use, maintain capacity and
reduce stress on the unit.
Before attempting to clean the coils; set thermostat to
the "OFF" position; turn the electrical power to the unit
to the "OFF" position at the disconnect switch. The
condenser coil can be thoroughly cleaned by wash-
ing from the inside out with water and a coil cleaner
and can be brushed on the outside by a broom. If coil
is extremely dirty with clogged fins, a serviceman who
specializes in coil cleaning should be called.
DO NOT BEND OR DAMAGE FINS.
If the unit has been off for over an hour, restore power
to the unit and wait two hours before turning the
thermostat on.
The inside (evaporator) coil can be inspected at the
air handler by removing the filters and observing the
cleanliness of the coil from the filter side.
If dirty, have an experienced serviceman clean by
washing from the blower side toward the filter side.
AIR HANDLER - FILTER INFORMATION
Install new filters with size indicated on the filters or as
indicated by installation instructions before running
the air handler. Be sure filters are installed in the correct
direction with respect to the air flow.
FILTERS SHOULD BE CHECKED EVERY 30 DAYS AND RE-
PLACED OR CLEANED AS NECESSARY.
Do not permit the unit to be operated unless the filters
are in place. Operation of the unit without filters will
result in a clogged evaporator coil - a very expensive
service job to correct.
AIR HANDLER - BLOWER INFORMATION
CLEAN BLOWER WHEELS are necessary to reduce elec-
trical use, maintain capacity and reduce stress on the
unit. To inspect and clean the blower; set thermostat
to the "OFF" position; turn the electrical power to the
unit to the "OFF" position at the disconnect switch.
Clean the assembly, check the bearings for looseness,
inspect the belt condition and tightness, check screws
for tightness, rotate blower wheel while listening close
to each bearing and with a finger on the bearing to
check for noise or roughness in the bearing, which
indicates a failing bearing. Replace blower deck, turn
on the power to the unit, if the unit has been off over
on hour do not turn the thermostat on for two or more
hours after turning on disconnect.
OBSTRUCTION TO AIR FLOW
Supply and return air grilles must be kept clear so air
can be freely drawn into and discharged from the
system.