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© 2019 Mitsubishi Electric US, Inc.
Specifications are subject to change without notice.
3. Damper blade adjustment
IMPORTANT!
It’s possible that during shipping, the damper shaft may have
moved in the actuator shaft clamp assembly.
In some cases due to manufacturing tolerances the LAHN blades
could close 100%.
The damper should never be 100% closed
during operation.
When working properly the damper will be
approximately 95% closed at -5°F and below. The following procedure
will allow proper adjustment.
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.
Belimo motor angle indicating
scale shown below.
The factory setting for the mechanical stop
is shown below at 85 degree hood angle.
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.
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.)
5. Re-tighten “U” bolts on damper shaft.
6. Release the motor by slightly cranking with the handle.
Check the operation manually.
7. The goal is to have ¼” opening on the damper assembly
in the 85 degree position.
LOW AMBIENT HOOD – LAHK-1 DAMPER BLADE ADJUSTMENT
IMPORTANT!
It’s possible that during shipping, the damper shaft may have moved in the actuator shaft
clamp assembly.
In some cases due to manufacturing tolerances the LAHK blades could close
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.
The Belimo damper motor within the LAHK 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
stop is shown below at 95.
Belimo motor angle indicating
scale shown below.
IMPORTANT! ENSURE POWER IS OFF BEFORE STARTING!!
Basic Service Overview
1.) Set damper motor stop to 85 degrees.
2.) Loosen “U” bolts on damper shaft
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.
