AAON RL-240 - Manual (Page 56)

56
Condensate Drain Pans
Drain pans will have moisture present and
require
periodic cleaning to prevent
microbial growth. Cleaning of the drain pans
will also prevent any possible plugging of
the drain lines and overflow of the pan itself.
Cleaning of the drain pans and inside of the
unit should be done only by qualified
personnel.
Supply Fans
Lubrication
All original fan motors and bearings are
furnished with factory lubrication. Some
applications will require that bearings be re-
lubricated periodically. The schedule will
depend on the operating duty, temperature
variations or other severe atmospheric
conditions.
Bearings should be re-lubricated when at
normal operating temperatures, but not
running. Rotate the fan shaft by hand and
add only enough grease to purge the seals.
DO NOT OVER LUBRICATE.
Filter Replacement
Monthly filter inspection is required to
maintain optimum unit efficiency.
It is strongly recommended that filter media
be replaced monthly. Filters are located
either upstream of the evaporator coil,
upstream of the blow-through supply
blowers, or in the final filter position.
Replace filters with the size indicated on
each filter or as shown in the tables below.
Arrow on the replacement filters must point
on the direction of airflow.
Evaporative-Cooled Condenser
Evaporative cooling equipment rejects heat
by evaporating a portion of the recirculated
water spray and discharging it from the unit
with the hot, saturated air. As the spray
water evaporates, it leaves behind the
mineral content and impurities of the supply
water. If these residuals are not purged from
the water distribution system, they will
become concentrated and lead to scaling,
corrosion, sludge build-up and biological
fouling.
A water treatment monitoring and control
system has been furnished with this unit. Be
sure to read the complete manual that has
been furnished. All water treatment is a
combination of bleed water and chemical
treatment for proper control of the residuals
and to prevent any biological contamination.
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
WARNING
Blower wheels and bands must be
inspected for excessive dust build up
periodically and cleaned if required.
Excessive dust build up on blower
wheels may cause an unbalanced
state; leading to vibration and/or
component failure. Damages due to
excessive dust build up will not be
covered under factory warranty.
CAUTION
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
WARNING