25
MAINTENANCE
PERIODIC SERVICE
NOTICE: The heater and vent system should be
checked once a year by a qualified technician.
All Maintenance/Service information should be recorded
accordingly on the Inspection Sheet provided in this
manual.
Open all disconnect switches and
disconnect all electrical and gas supplies and
secure in that position before servicing unit.
Failure to do so may result in personal injury or
death from electrical shock.
Should maintenance be required, perform the following
inspection and service routine:
1. Inspect the area near the unit to be sure that there
is no combustible material located within the
minimum clearance requirements listed in this
manual.
Under no circumstances should
combustible material be located within the
clearances specified in this manual. Failure to
provide proper clearance could result in
personal injury or equipment damage from fire.
2. Turn off the manual gas valve and electrical power
to the unit heater.
3. To clean or replace the main burners, remove burner
cover. Remove top strip from above main burners.
Lift burners up and pull away from manifold to
remove.
4. With the burners removed, wire brush the inside
surfaces of the heat exchanger.
5. Remove any dirt, dust, or other foreign matter from
the burners using a wire brush and/or compressed
air. Ensure that all parts are unobstructed. Inspect
and clean the pilot burner if necessary.
6. Reassemble the unit heater by replacing all parts in
reverse order.
7. Relight the pilot (see lighting instruction on the unit
nameplate). Complete the appropriate unit startup
procedure as given in the “Operation” section of
this manual.
8. Check the burner adjustment.
9. Check all gas control valves and pipe connections
for leaks.
10. Check the operation of the automatic gas valve by
lowering the setting of the thermostat, stopping the
operation of the gas duct furnace. The gas valve
should close tightly, completely extinguishing the
flame on the main burners.
11. Inspect and service motor/fan assembly. To maintain
efficient air flow, inspect and clean the fan blades
and guard to prevent buildup of foreign matter.
12. Check lubrication instructions on motor. If oiling is
required, add 3 or 4 drops of electric motor oil as
follows:
a. Light Duty - After 3 years or 25,000 hours of
operation.
b. Average Duty - Annually after 3 years or 8,000
hours of operation.
c. Heavy Duty - Annually after 1 year or at least
1500 hours of operation.
Never over oil the motor or premature
failure may occur!
14. Check and test the operational functions of all safety
devices supplied with your unit.
