Aerco GF-110 Benchmark Series, Installation, Operation & Maintenance Instructions Manual

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MAINTENANCE
7.5 SAFETY DEVICE TESTING
Systematic and thorough tests of the operating
and safety devices should be performed to
ensure that they are operating as designed.
Certain code requirements, such as ASME CSD-
1, require that these tests be performed on a
scheduled basis. Test schedules must conform
to local jurisdictions. The results of the tests
should be recorded in a logbook. See Chapter 6-
Safety Device Testing Procedures.
7.6 BURNER
The Burner Assembly is located at the top of the
unit. The Burner Assembly may be HOT. Allow
the unit to cool sufficiently before removing the
assembly.
The following parts will be required for
reassembly after Burner Assembly inspection or
replacement:
161432 Burner Gasket
161433 Burner Release Gasket
To inspect or replace the Burner Assembly,
proceed as follows:
1. Set the ON/OFF switch on the control panel,
to the OFF position and disconnect AC
power to the unit and turn off the gas supply.
2. Remove the side and top panels from the
unit.
3. Disconnect the lead wire from the flame
detector.
4. Disconnect the igniter cable from the igniter
contactor.
5. Disconnect the combustion air hose from the
burner by loosening the hose clamp. (See
Fig. 7.3)
6. Remove the four (4) 5/8-11 nuts and bolts
from the gas outlet side of the Air/Fuel
Valve. (See Fig 7.3).
NOTE:
Do not remove the gas inlet pipe from the
Burner Assembly (See Fig. 7.3).
7. Remove the six (6) 5/16-16 bolts from the
burner flange. (See Fig 7.3)
Figure 7.3
Burner Disassembly Diagram
NOTE:
The Burner Assembly is heavy and
weighs approximately 25 pounds. Use
care when removing.
8. Remove the Burner Assembly from burner
flange by lifting it straight up.
9. Following Burner inspection and/or replace-
ment, remove and replace the Burner
Release Gasket (161433) and Burner
Gasket (161432).
10. Prior to reinstalling the Burner Assembly,
ensure that the O-ring is properly inserted in
the groove on the gas outlet flange of the
Air/Fuel Valve.
11. Replace the Burner Assembly and align it
with the tapped holes in the burner flange.
Secure the Burner to the flange using the six
5/16-16 bolts. DO NOT fully tighten these
bolts at this time.
CAUTION
It is imperative that the Gas Inlet Pipe on
the Burner Assembly (Figure 7.3) be
properly aligned with the four bolt holes
on the gas outlet flange of the Air/Fuel
Valve. Failure to observe this precaution
may cause physical damage to the Gas
Inlet Pipe resulting in cracks and/or gas
leaks.
12. While observing the above CAUTION,
ensure that the Gas Inlet Pipe is properly
aligned with the four bolt holes on the gas
outlet flange of the Air/Fuel Valve. When
properly aligned, the four 5/8-11 bolts can be
easily inserted in the bolt holes. If gas train
7-3