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control panel). The RH Lvl Pos= parameter indicates the
current position of the vane for the right-hand
DesignFlow station (control panel side).
Important: Wait several seconds until the value on the
keypad stabilizes before taking the reading.
For detailed information regarding operation and
navigation through the unit keypad, refer to Operation
manual OM 137 (discharge air control units) or OM 138
(zone control units).
Confirm the value of the reading. Ideally, it should read
6
close to 20.00 (19.50 to 20.50 is acceptable). If the
reading is out of range, loosen the screws fixing the
mechanical stop at the top of the assembly, make a small
adjustment, and recheck until the reading is in the
specified range.
Note: Generally, adjustments should not be necessary.
Locate the leveling component kit, which is shipped with
7
the unit, in the unit mail control panel.
Duct tape the fulcrum alignment plate to the bottom
8
corner of the vane (see
The bottom edge of its notches should be flush with
a
the bottom edge of the vane.
The side of one notch should be even with the bend
b
near the outer edge of the vane.
The plate should be flat against the outer surface of
c
the vane.
Figure 99: Tape Fulcrum Alignment Plate to Vane
Locate and install the fulcrum used in the leveling
9
procedure as follows (see
Wipe the bottom of the louver door where the fulcrum
a
will be located so that the duct tape will stick to it.
Pre-apply duct tape to the top surface of the bottom
b
portion of the fulcrum, extending it about one inch
beyond the edges on three sides.
With the alignment plate taped to the vane and the
c
vane in the zero airflow position, locate the fulcrum
parallel to and against the alignment plate.
McQuay IM 987
Figure
99) aligning it as follows:
V a n e
D u c t T a p e
T h i s E d g e
F l u s h w i t h
B o t t o m
o f V a n e
T h e s e E d g e s
F l u s h w i t h
B o t t o m
o f
V a n e
A l i g n m e n t
P l a t e
F u l c r u m
D u c t T a p e
Figure
99):
Note: The zero airflow position is when the vane is swung
away from the back wall and gently resting against
its stop.
Once the fulcrum is in position, press the duct tape
d
extensions down to hold the fulcrum in place.
Remove the alignment plate after installing the
e
fulcrum.
Close and latch the louvered intake door.
10
Remove the cover from the access opening in the bottom
11
blade of the outdoor air intake louver (see
page
90).
Verify that the unit fans are off and that the outdoor air
12
dampers are closed. If there is a wind, cover the outdoor
air louvers with poly film, cardboard, or other suitable
material to prevent adverse readings due to wind.
Rest the leveling weight assembly on the fulcrum, as
13
shown in
Figure
100, so that:
Its bottom two thumbscrews rest on the top edge of
a
the fulcrum.
Its top thumbscrew rests against the vertical
b
alignment mark on the vane.
Note: The alignment mark is located 0.50 inch in from the
bend on the outer edge of the vane. It intersects with
a hole located one inch up from the bottom outer
edge of the vane.
Figure 100: Place Leveling Weight On Fulcrum
Unit Options
Figure 102,
89
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