90
McQuay IM 987
Unit Options
14
Set up the leveling test as follows:
a
While holding the weight so it stays on the fulcrum,
manually rotate the vane to the wide-open position,
manually return it to the zero CFM position, and
gently release the vane.
b
Locate the leveling weight assembly so its contact
point is against the vertical mark on the vane.
c
While the weight assembly teeters on the fulcrum,
gently rap the base frame to slightly vibrate the
assembly and encourage the vane to seek its
equilibrium point.
15
Read the current
LH Lvl Pos
= (or
RH Lvl Pos
=)
parameter in the DesignFlow Setup menu on the keypad/
display. These parameters vary from 20% to 80%
depending on the position of the DesignFlow vane
16
If the value indicated by the
LH Lvl Pos=
(
or RH Lvl
Pos=
) parameter is not within the range of 22.56% to
23.02%, (22.79% is ideal) adjust the level of the
DesignFlow unit using the procedure described in
“Making Level Adjustments” below.
17
When the
LH Lvl Pos
= (or
RH Lvl Pos
=) value is in
range, remove the fulcrum and leveling weight assembly
and replace the access opening cover in the louvered
door.
Making Level Adjustments
The DesignFlow unit is mounted so that it pivots at the top
when three lock nuts are loosened, two at the top and one at
the bottom of the assembly (see
Figure 101
). Leveling the unit
involves precisely pivoting the assembly with a known force
applied to the vane until the vane opens to a specific position.
If after performing Steps 13 through 15 (previous page), the
vane does not come to rest within the specified range, carry out
the following steps:
1
Unlock and open the louvered outdoor air intake door on
the side of the unit.
2
Loosen the two 1/4-20 NC lock nuts at the top of the
DesignFlow frame (see
Figure 101
).
Figure 101: DesignFlow Frame
3
Close and lock the intake door.
4
Remove the cover from the access opening in the bottom
blade of the outdoor air intake louver (see
Figure 102
).
5
Loosen the 1/4-20 NC lock nut in the slotted hole at the
bottom of the DesignFlow frame (see
Figure 103
).
Figure 102: Remove Covers from Access Opening
6
If the
LH Lvl Pos=
(
or RH Lvl Pos=
) value obtained in
step 15 above is HIGHER than the specified range
,
move the bottom of the DesignFlow frame closer to the
outdoor air dampers (away from the back end of the
unit). Do this by turning the long adjuster nut to increase
the L dimension in
Figure 103
.
If the
LH Lvl Pos=
(
or RH Lvl Pos=
) value obtained in
step 15 above is LOWER than the specified range
,
move the bottom of the DesignFlow frame away from
the outdoor air dampers (toward the back end of the
unit). Do this by turning the long adjuster nut to decrease
the L dimension in
Figure 103
.
Note:
If the necessary adjustment cannot be made using
the long adjuster nut, reposition the two 1/4-20 NC
jam nuts on the threaded rod to make larger
adjustments (see
Figure 103
).
7
When finished making the adjustments, tighten the
1/4-20 NC lock nut in the slotted hole at the bottom of
the DesignFlow frame (see
Figure 103
).
Figure 103: Leveling Adjustment
Top lock nuts
Vane
Bottom lock nut
Pivot point
Louvered
door
Access opening
Cover
Threaded adjuster
assembly
Long adjuster nut
Jam nuts
Locknut
To INCREASE L dimension
L
To INCREASE L dimensi
L
Right hand adjuster
Left hand adjuster
Содержание RAH 047C
Страница 70: ...70 McQuay IM 987 Wiring Diagrams Figure 78 VAV Control Inputs Schematic continues on next page ...
Страница 71: ...McQuay IM 987 71 Wiring Diagrams Figure 79 VAV Control Inputs Continued Schematic continues on previous page ...
Страница 74: ...74 McQuay IM 987 Wiring Diagrams Figure 82 VFD Control SAF and RAF Schematic continues on next page ...
Страница 104: ...104 McQuay IM 987 Final Control Settings Figure 117 Keypad Accessible Menu Structure ...
Страница 105: ...McQuay IM 987 105 Final Control Settings Figure 118 Keypad Accessible Menu Structure Continued ...
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