507762-01
Issue 1907
Page 45 of 46
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
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
Annual Furnace Maintenance
At the beginning of each heating season, and to comply
with the Allied Air Limited Warranty, your system should be
checked as follows:
NOTE:
Burner inspection and service is not recommended
for annual furnace maintenance.
1. Check wiring for loose connections, voltage at indoor
unit and amperage of indoor motor.
2. Inspect all gas pipe and connections for leaks.
3. Check the cleanliness of filters and change if necessary
(monthly).
4. Check the cleanliness of blower assembly and
clean the housing, blower wheel and blower motor if
necessary.
5. Inspect the condensate drain and trap for leaks and
cracks. Check any additional traps such as in the
crawl space exhaust. The drain and trap must also be
cleaned and the trap must be primed with water.
6. Remove the rubber hoses from the cold end header
box and inspect for any blockage, clean as needed.
If strainers are installed in the hoses remember to
remove and clean before reinstalling the hoses.
7. Evaluate the heat exchanger and combustion chamber
integrity by inspecting the heat exchanger per the AHRI
heat exchanger inspection procedure. This procedure
can be viewed at www.ahrinet.org.
8. Ensure sufficient combustion air is available to the
furnace. Fresh air grilles and louvers (on the unit and
in the room where the furnace is installed) must be
properly sized, open and unobstructed to provide
combustion air.
9. Inspect the furnace intake and exhaust pipes to make
sure they are in place, structurally sound, without
holes, blockage or leakage and the exhaust pipe is
sloped toward the furnace. Inspect terminations to
ensure they are free of obstructions and are structurally
sound. If applicable, inspect and clean air intake
screen. Inspect the furnace return air duct connection
to ensure the duct is sealed to the furnace.
10. Inspect the furnace return air duct connection to
ensure the duct is sealed to the furnace. Check for
air leaks on supply and return ducts and seal where
necessary.
11. Check the condition of the furnace cabinet insulation
and repair if necessary.
12. Perform a complete combustion analysis during
the furnace inspection to ensure proper combustion
and operation. Consult Service Literature for proper
combustion values.
13. Verify operation of smoke detectors and CO detectors
and replace batteries as required.
Perform a general system test. Turn on the furnace to
check operating functions such as the start-up and shut-off
operation.
1. Check the operation of the ignition system, inspect
and clean flame sensor. Check microamps before and
after. Check controls and safety devices (gas valve,
flame sensor, temperature limits). Consult Service
Manual for proper operating range. Thermal Limits
should be checked by restricting airflow and not
disconnecting the indoor blower. For additional details,
please see Service and Application Note H049.
2. Verify that system total static pressure and airflow
settings are within specific operating parameters.
3. Clock gas meter to ensure that the unit is operating at
the specified firing rate. Check the supply pressure and
the manifold pressure. If manifold pressure adjustment
is necessary, consult the Service Literature for unit
specific information on adjusting gas pressure. Not all
gas valves are adjustable. Verify correct temperature
rise.
Winterizing and Condensate Trap Care
1. Turn off power to the furnace.
2. Have a shallow pan ready to empty condensate water.
3. Remove the clean out cap from the condensate trap
and empty water. Inspect the trap then reinstall the
clean out cap.
