Inspection and Maintenance
5-12
750-392
CBEX-DE
4. Rig the davit arm to the fan/motor cassette as in the example below. Secure lifting chains to the lifting eyes on
the cassette backplate and to the lifting lug(s) on the motor if any are provided. Arrange the chains so the lift-
ing point is over the motor shaft centerline and the center of balance for the fan/motor cassette. This point is
approximately 4 inches from the motor backplate for 600-800 HP units, and 3 inches for 250-500 HP units.
5. Remove the fan/motor cassette fastening nuts.
6. Swing the fan/motor cassette to the side and secure it to the boiler using high strength cord. Do not over-
extend the motor wires.
FIGURE 5-6. Fan/motor cassette rigging
5.14 — IFGR Inspection and Adjustment
NOx levels should be checked periodically to ensure compliance with all local and federal regulations, as well as
to ensure that the boiler is operating at maximum efficiency. Linkages should be inspected and free movement
(no binding) of the IFGR damper confirmed.
Increasing or decreasing NOx levels could indicate incorrect damper positioning, an improper air-to-fuel ratio, or
stack draft changes. If adjustment is required, or if problems persist, contact your local Cleaver-Brooks autho-
rized representative for further assistance.
As ash and products of combustion pass through the IFGR damper, there will be some accumulation on the
damper, windbox, and other parts of the IFGR system and burner.
When suspending the fan/motor cassette from the davit arm, all equipment used must be of adequate strength to
safely support the complete cassette. Failure to follow these instructions could result in serious injury or death.
!
Warning
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