750-392
CBEX-DE
5-13
Fan/Motor Cassette Replacement
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.
5. Check and replace any gaskets that have been damaged. Gaskets that have been in use for one year or more
should be replaced. In particular, inspec
6. t the airbox gasket for damage.
5.15 — Fan/Motor Cassette Replacement
To close the fan/motor cassette:
1. Check that all adjustment screws are tight, and check the linkage and IFGR damper for free movement before
closing the unit.
2. Position the cassette into the front door.
Impeller clearance inches
60 PPM 30 PPM
.040
+ .010 .050 + .010, - .005
When replacing the airbox gasket, use only Cleaver-Brooks components. Failure to use components designed for this
application can result in improper combustion. Failure to follow these instructions could result in equipment damage.
Do not remove the davit arm assembly from the motor/fan cassette without first verifying that the cassette is securely
bolted to the boiler. Failure to follow these instructions could result in serious injury or death.
!
Caution
!
Warning
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