Damper Blade Adjustment - Mitsubishi Electric LAHN-1 Technical & Service Manual

100%. The damper should never be 100% closed during operation. When working properly
the damper will be approximately 95% closed at 20 degrees and below. The following
procedure will allow proper adjustment.

3. Damper blade adjustment

The Belimo damper motor within the LAHK control box has a built in mechanical stop to
IMPORTANT!
adjust the maximum angle of rotation. This must be adjusted to 85 degrees and the damper
It's possible that during shipping, the damper shaft may have
moved in the actuator shaft clamp assembly.
blade position verified or re-set to the proper position (1/4" open) to ensure the unit
In some cases due to manufacturing tolerances the LAHN blades
could close 100%. The damper should never be 100% closed
functions properly.
during operation. When working properly the damper will be
approximately 95% closed at -5°F and below. The following procedure
will allow proper adjustment.
Belimo motor angle indicating
Belimo motor angle indicating
scale shown below.
scale shown below.
IMPORTANT! ENSURE POWER IS OFF BEFORE STARTING!!
Basic service overview
1. Set the damper motor stop to 85 degrees.
2. Loosen "U" bolts on damper shaft.
IMPORTANT! ENSURE POWER IS OFF BEFORE STARTING!!
3. Crank the motor against the 85-degree stop then lock into
position.
4. Set the damper to approx. ¼" open.
(Use the damper crank handle as spacer.)
Basic Service Overview
5. Re-tighten "U" bolts on damper shaft.
6. Release the motor by slightly cranking with the handle.
1.) Set damper motor stop to 85 degrees.
Check the operation manually.
2.) Loosen "U" bolts on damper shaft
7. The goal is to have ¼" opening on the damper assembly
in the 85 degree position.
3.) Crank motor against 85 degree stop then lock into position
4.) Set damper to approx. ¼" open. (Use damper crank handle as spacer.)
5.) Re-Tighten "U" bolts on damper shaft
6.) Release motor by slightly cranking with handle. Check operation manually
7.) The goal is to have ¼" opening on damper assembly in the 85 degree position.
© 2019 Mitsubishi Electric US, Inc.
The Belimo damper motor within the LAHN control box has a built in
mechanical stop to adjust the maximum angle of rotation. This must
be adjusted to 85 degrees and the damper blade position verified or
re-set to the proper position (1/4" open) to ensure the unit functions
properly.
The factory setting for the mechanical
The factory setting for the mechanical stop
stop is shown below at 95.
is shown below at 85 degree hood angle.
Specifications are subject to change without notice.
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