507713-01
Page 29 of 32
Issue 1623
Cleaning the Burners
NOTE:
Use papers
or
protective covering in front of the
furnace during cleaning
.
1. Turn off both electrical and gas power supplies to
furnace.
2. Label the wires from gas valve
,
rollout switches
,
primary
limit switch and make-up box then disconnect them
.
3.
Disconnect gas supply piping
.
Remove the screw
securing the burner box cover and remove cover
.
Remove the four screws securing the burner manifold
assembly to the vestibule panel and remove the
assembly from the unit
.
Figure 38
Burner, Combustion Air Inducer Assembly & Heat Exchanger Removal
Service
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death or property
damage.
Improper servicing could result in dangerous operation,
serious injury, death, or property damage. Before
servicing, disconnect all electrical power to furnace.
When servicing controls, label all wires prior to
disconnecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
WARNING
At the beginning of each heating season, a qualified
technician should check the system as follows:
Blower
Check the blower wheel for debris and clean if necessary.
The blower motors are prelubricated for extended bearing
life. No further lubrication is needed.
Filters
Filters are installed external to the unit. Filters should
be inspected monthly. Clean or replace the filters when
necessary to ensure that the furnace operates properly.
Replacement filters must be rated for high velocity airflow.
Table 1 lists recommended filter sizes.
Flue And Chimney
1. Check flue pipe, chimney and all connections for
tightness and to make sure there is no blockage.
2. Check unit for proper draft.
Electrical
1. Check all wiring for loose connections.
2. Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC ± 10%.
3. Check amp draw on the blower motor with inner blower
panel in place.
Unit Nameplate___________Actual_______________
The blower access panel must be securely in place
when the blower and burners are operating. Gas fumes,
which could contain carbon monoxide, can be drawn
into living space resulting in personal injury or death.
WARNING
