Internal Isolation Assembly Adjustment
On units with internally isolated fan and motor assemblies, the
assemblies are secured for shipment .
Before Operating the Unit
Remove the shipping brackets and tie-down bolts (refer to
Figure 36
,
Figure 37
and
) and discard . The shipping brackets
located on the opposite drive side of the unit are difficult to
access from the drive side of the unit . Either remove them
before the unit is assembled, or remove the panel on the
opposite drive side to gain access .
The spring isolators under the four corners of the fan and
motor assembly are factory adjusted while the fan was not
running . With the unit operating at normal cfm and static
pressure, all the isolators should be at the same height
opening (
Table 1
through
Table 5
) . If adjustments are required,
loosen the 1/2" cap screw on top of the isolator and turn
the adjusting bolt to lower or raise the fan and motor base.
Retighten the cap screw when adjustments are completed.
Table 1: Motor Beside Fan Spring Mount Adjustments
Spring Mount Adjustment at Rest
Isolator Position
Top or Bottom
Horizontal H
Downblast H
Upblast H
Unit Sizes 003 – 035
1
3 .75
3 .75
4 .25
2
4 .25
3 .75
4 .25
3
4 .25
3 .75
4 .25
4
3 .75
3 .75
4 .25
Unit Sizes 040 – 090
1
6 .00
6 .00
6 .50
2
6 .50
6 .00
6 .50
3
6 .50
6 .00
6 .50
4
6 .00
6 .00
6 .50
Table 2: Motor Behind Fan Spring Mount Adjustments
Spring Mount Adjustment at Rest
Isolator Position
Top or Bottom
Horizontal H
Downblast H
Upblast H
Unit Sizes 003 – 035
1
6 .75
6 .75
6 .75
2
6 .75
6 .75
6 .75
3
6 .75
6 .75
6 .75
4
6 .75
6 .75
6 .75
Unit Sizes 040 – 090
1
6 .75
6 .75
6 .75
2
6 .75
6 .75
6 .75
3
6 .75
6 .75
6 .75
4
6 .75
6 .75
6 .75
For models 040 through 090 with housed fans, the isolators
should be at equal height (6") during fan operation . Center the
fan outlet in the outlet panel opening . If adjustment is required,
loosen the bolt on top of the isolator assembly (
. Turn the
adjustment nut below the fan frame to lower or raise the fan
motor and frame assembly . Retighten the bolt on top of the
isolator assembly .
Table 3: Class II Belt-Drive Plenum Fan Spring Height
Fan Size
Isolator Type
Operating Height (in .)
13–16
Standard 2" Deflection
4 .5
18–36
Standard 2" Deflection
4 .0
13–36
Seismic
4 .0
40–60
All
6 .75
Table 4: Class III Plenum Fan Spring Height
Cabinet Width (in .)
Isolator Type
Operating Height (in .)
Width < 108
All
4 .0
Width ≥ 108
All
6 .75
Table 5: Class II Direct-Drive Plenum Fan Spring Height
Fan Size
Isolator Type
Operating Height (in .)
11–36
All
4 .0
40–44
All
6 .75
Figure 35: Adjusting Large Spring Mount Assembly
M
eChanICal
I
nsTallaTIon
www.DaikinApplied.com
23
IM 672-11 • VISION AIR HANDLING UNIT
