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21.4 Manifold and Controls
Manifold
Air Flow Switch
Electric Components
Temperature Sensors
21.5 Burner
Periodically check gas control assembly and internal and external piping for
leaks. Relief vent lines to outdoors on gas controls should be checked to
ensure against blockage caused by insects or any other substance. Clean as
required.
All gas piping to the air handler must comply with the National Fuel Gas Code
- NFPA54, latest edition and all local codes. Verify gas soundness of each
SSOV (Safety Shut Off Valve). This test must be repeated after the first 100
hours of operation.
See Page 37 , Figure 18 through Page 38, Figure 21.
An annual check of the tubes attached to the air flow switch should be made
to ensure against blockage caused by insects or any other substance. Clean
as required.
See Page 63, Section 20.4.
Check for physical damage on any of the electric components and verify all
electrical connections are secure. Ensure equipment is properly grounded.
Calibrate space, outdoor air, and discharge air sensors as required.
See Page 63, Section 20.2.3.
An annual inspection of the burner and components must be made to ensure
proper and safe operation. For the most part, the burner is self cleaning.
However, if the application is extremely dirty or dusty, it may become neces-
sary to periodically clean the burner. Inspect and clean the burner in accor-
dance with the following recommended procedures:
1.
To avoid damaging the valves, disconnect the burner piping from the
manifold, at the union, and cover the exposed end of the manifold. See
Page 37 , Figure 18 through Page 38, Figure 21.
2. Remove the pilot assembly. See Page 43, Section 16.6.4.
3. Remove the ignition cable from the igniter on the side of the burner, and
then remove the spark igniter. Clean the igniter contacts with a wire
brush. Set the gap to 0.125" (3.17 mm).
4. Inspect each of the stainless steel mixing plates to see that all of the air
holes are free of debris. Clean with a wire brush as necessary.
5. The burner orifices may need to be drilled to unplug any closed orifices.
Use a pin vise with the appropriate drill to clean debris from the orifices.
An electric drill is not suggested because it is easy to snap drill bits off
in the orifices.
6. Reinstall the pilot assembly. Reconnect the burner piping to the mani-
fold at the union.
SECTION 21: M
AINTENANCE
73
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