3-7
3.6 ADJUSTING THE DAMPERS
1. As shown in Fig. 3-2, 3-3 or 3-4, you should install dampers in the outlet ducts for
both the process and reactivation air streams. On the reactivation outlet, mount the
assembly horizontally so the damper moves side-to-side, not up-and-down.
2. Open both of the dampers. Turn on power to the unit, using the circuit breaker. Set
the Auto/Off/Manual switch to Manual to turn on the unit.
3. Allow the unit to warm up for 1/2 hour. Check the temperature at the reactivation
outlet. It should be 120°F ±5°F.
4. If the temperature at the reactivation outlet is less than 120°F ±5°F, the volume of
the process air must be reduced. (Notice that you're changing the position of the
process damper to affect the temperature at the reactivation air outlet.) Close the
process damper completely. Wait ten minutes for the temperatures in the machine
to stabilize.
5. Wait ten minutes, then check the temperature at the reactivation outlet again. The
temperature should now be at least 120°F.
6. Open the process damper a bit. Wait ten minutes before checking the reactivation
outlet temperature again. If it is still above 120°F, open the process damper and
wait again. Continue doing this until you nd the setting which causes the reactiva-
tion temperature to drop to 120°F. This is the correct setting for the process damper.
7. When the process damper is set correctly, the temperature at the reactivation outlet
will be 120°F. Next, adjust the position of the reactivation damper. This will help the
unit to operate as efciently as possible. Close the reactivation damper a bit, and
mark the damper setting. Wait ten minutes for the temperatures in the machine to
stabilize, then check the temperature at the reactivation outlet.
8. If the temperature remains at 120°F ±5°F, close the reactivation damper a bit more
and mark the new damper setting. At the point where the reactivation outlet tem-
perature drops below 115°F, the reactivation damper is closed too far. Reopen the
reactivation damper to the last setting.
Note -
In some installations, the conditions of the process air entering the unit will change
frequently. In a case like this, it may be necessary to leave the reactivation damper
completely open. This will prevent nuisance overheating faults.
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