AAON F-060 - Manual (Page 27)

27
Annually:
Clean the condenser and evaporator coils
with steam or a non-corrosive cleaner.
Clean the drain line, “P” trap and condensate
pan.
Check refrigerant pressures and
temperatures every spring and correct
unusual readings.
Check heating section every fall. Check all
electrical connections for tightness and
check heater elements for indications of
overheating. Determine cause and replace
elements if necessary.
Inspect and clean unit interior at the
beginning of each heating and cooling
season and as operating conditions require.
Lubrication
All original motors and bearings are
furnished with factory lubrication. They
require no lubrication.
Blower Assembly
F1 air handling units are equipped with
highly efficient forward curved fans. The
blower wheel should be inspected
periodically and cleaned of dust and debris.
Clean blower wheels reduce electrical 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. Check set
screw for tightness.
Coils
Coils should be inspected and cleaned
annually to ensure there is no obstruction to
airflow. Dirty evaporator coils will
eventually freeze up, and often result in a
time consuming and expensive service call. Clean filters will help to prevent dirt from
accumulating on the evaporator. The
evaporator should be cleaned annually with
a non-corrosive coil cleaning solution.
Heating
Electric:
Set thermostat in the heat mode; call for heat
to engage all electric heat strips. Verify that
electric heat operates correctly.
Heat Pump:
Set thermostat in the heat mode; call for heat
to engage the three-way valve and turn the
heat pump mode on. Verify that the heat
pump operates correctly.
Hot Water:
Set thermostat in the heat mode; call for hot
water valve to open. Verify that hot water
valve opens with call for heat.
Filters
Open filter access door. Slide filters away
from unit and inspect. Replace dirty filters
with 20” x 20” x 1” filters.
Ensure that the arrow points toward the
blower in the direction of airflow. Filters
should be checked every 30 days and
replaced or cleaned as necessary.
Permanent type filters may be vacuumed
and/or washed but should not be reinstalled
until thoroughly dry. Most air filters are
marked to indicate the direction of airflow,
and this should be carefully noted when they
are being installed.
Equipment should never be operation
without filters.
CAUTION