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Internal Isolation Assembly Adjustment
On units with internally isolated fan and motor assemblies, the
assemblies are secured for shipment. with a tie-down at each
point of isolation.
Before Operating the Unit:
Remove the shipping brackets and tie-down bolts (see
30,
Figure 31
and
Figure
32) 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. See
Table 1
through
operating at normal cfm and static pressure, all the isolators
should be at the same height opening. 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
Top or Bottom Horz .
position
H
Unit Sizes 003 – 035
1
3.75
2
4.25
3
4.25
4
3.75
Unit Sizes 040 – 090
1
6.00
2
6.50
3
6.50
4
6.00
Table 2: Motor Behind Fan Spring Mount Adjustments
Spring Mount Adjustment at Rest
Isolator
Top Or Bottom Horz .
Position
H
Unit Sizes 003 – 035
1
6.75
2
6.75
3
6.75
4
6.75
Unit Sizes 040 – 090
1
6.75
2
6.75
3
6.75
4
6.75
IM 777-8 • Skyline Air Handler
Figure
Table 5
below. With the unit
Downblast
Upblast
H
H
3.75
4.25
3.75
4.25
3.75
4.25
3.75
4.25
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
Downblast
Upblast
H
H
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
6.75
For models 040 through 090 with housed fans, the isolators
should be at equal height during fan operation (6"). Center the
fan outlet in the outlet panel opening. If adjustment is required,
loosen the cap screw 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 cap screw on top of
the isolator assembly.
Figure 29: Adjusting Large Spring Mount Assembly
Table 3: Class II Belt-Drive Plenum Fan Spring Height
Fan Size
13–16
18–36
13–36
40–60
Table 4: Class III Plenum Fan Spring Height
Cabinet Width
Width < 108"
Width > or = 108"
Table 5: Class II Direct-Drive Plenum Fan Spring Height
Fan Size
11–36
40–44
18
M
I
eChanICal
nsTallaTIon
Isolator Type
Operating Height (in .)
Standard 2"
Deflection 4.5
Standard 2"
Deflection 4.0
Seismic
4.0
All
6.75
Isolator Type
Operating Height (in .)
All
4.0
All
6.75
Isolator Type
Operating Height (in .)
All
4.0
All
6.75
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