750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
8-11
8.11 — Air Control Damper, Linkage, and Cam Spring
Coils may be replaced without removing the valve from the line.
Check coil position and make sure that any insulating washers or retaining springs are reinstalled in proper order.
8.11 — Air Control Damper, Linkage, and Cam Spring
The burner air control damper should be checked for free movement as a part of the monthly inspection. With the
burner off and the jackshaft damper control rod disconnected, the air control damper should rotate freely through
its entire range of movement. Any resistance to movement or excessive play in the support bearing should be inves-
tigated and corrected before the burner is put back in operation.
The overall tightness of the linkage assembly should be checked monthly. If necessary, tighten the setscrews and the
connections at the uniballs. Check the uniballs for wear and replace if necessary.
The linkage assembly should be tight but should not bind. If the linkage assembly is binding, determine the cause
of the binding and correct as necessary.
Linkage rod end attachment points should be marked on the variable displacement linkage arms as an aid in subse-
quent reassembly.
Inspection of the air damper and linkage bearings should be performed on a more frequent basis if the boiler is
operating in a dirty environment.
The fuel cam profile spring should be inspected monthly for wear, scoring or distortion. If any of the questionable
conditions are found, the spring must be replaced immediately to avoid the possibility of breakage in service. Use
care to avoid damaging the cam or spring during installation.
Lubricate occasionally with a non-gumming, dripless, high-temperature lubricant such as graphite or a silicone
derivative.
Be sure to turn off power to the valve in order to avoid electrical shock. Failure to follow these instructions could result
in serious injury or death.
Combustion should be checked and readjusted whenever the burner is removed or any control linkage is disturbed.
Failure to follow these instructions could result in equipment damage.
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