Allied 80G2UH-V, Installation Instructions Manual

Page: 36 / 44

507335-01 Page 36 of 44 Issue 1624
Maintenance
Failure to follow the 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. Reconnect wires correctly.
• Verify proper operation after servicing.
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD
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.
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
Filters
All 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______________
Cleaning the Heat Exchanger and 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. Remove flue pipe and top cap (some applications top
cap can remain) from the unit.
3. Label the wires from gas valve, rollout switches, primary
limit switch and make-up box then disconnect them.
4. Remove the screws that secure the combustion air
inducer/pressure switch assembly to the collector box.
Carefully remove the combustion air inducer to avoid
damaging blower gasket.
If
gasket is damaged, it must
be replaced to prevent leakage.
5. Remove the collector box located behind the combustion
air inducer. Be careful with the collector box gasket. If
the gasket is damaged, it must be replaced to prevent
leakage.
6. 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.
7. Remove screws securing burner box and remove burner
box.
8.
NOX units only
- Remove screw securing NOX insert.
Remove NOX insert. See Figure 39.