750-368
CBEX Elite 100-1200 HP
8-15
8.13 — IFGR Inspection and Adjustment
FIGURE 8-12. Fan/Motor Cassette
8.13 — 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.
To ensure proper operation of the IFGR system and burner, inspection and cleaning should be performed at regu-
lar intervals, depending on the load, type of fuel, and combustion temperatures.
1. With the IFGR damper exposed, inspect the internal linkages for secure connections, and check for free move-
ment of the linkage arms and the IFGR damper assembly.
2. The clearance between the impeller and backplate should be checked and adjusted if required. Impeller clear-
ances must correspond to the measurements in the table below:
3. The impeller clearance is checked by inserting a long feeler gauge of the proper thickness between the impel-
ler and the impeller housing. Impeller clearances should be checked at the highest fin on the impeller (that fin
which is closest to the impeller housing), and must be checked at each point where the housing is attached to
the motor backplate.
4. If the impeller clearance is not correct at all points, adjust:
A. Loosen the retaining nuts on both sides of the impeller housing.
B. Adjust the retainers for the correct impeller clearance at two housing attachment points 180º apart.
C. Adjust the retainers for correct clearance at the housing attachment points 90º from those initially
adjusted.
D. Adjust for correct impeller clearance at the remaining attachment points.
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.
Standard 60 PPM
30 PPM
9 PPM
.040 +
.010 .050 + .010
- .005
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