AAON RZ Series, Installation Operation & Maintenance

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54
Maintenance
(See back of the manual for maintenance
log)
At least once each year, a qualified service
technician must check out the unit. Fans,
evaporator coils and filters must be inspected
monthly.
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.
Re-lubricate bearings 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.
Recommended greases are:
SHELL OIL - DOLIUM R
CHEVRON OIL - SRI No. 2
TEXACO INC. - PREMIUM RB
DX Cooling
Set unit controls to cooling mode of operation
with supply fans on. Check the fans for
correct operating direction, amperage and
voltage.
Check compressor operation,
rotation, amperage and voltage to the unit
nameplate (check the amperage on the load
side of the compressor contactor).
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 must be done only by qualified
personnel.
Filter Replacement
Monthly filter inspection is required to
maintain optimum unit efficiency.
Replace filter media 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.
Brazed Plate Heat Exchanger Cleaning
Because of a normally high degree of
turbulence in brazed plate heat exchangers,
for many applications the heat exchanger
channels are self cleaning. For applications
that are not self cleaning (i.e. hard water at
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