141
JOHNSON CONTROLS
SECTION 5 – TECHNICAL DATA
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
55
SEISMIC ISOLATOR INSTALLATION AND ADJUSTMENT
Units shipped on or after June 15, 2008
1. Read instructions in their entirety before begin-
ning installation.
2. Isolators are shipped fully assembled and are to be
positioned in accordance with the submittal draw-
ings or as otherwise recommended.
3. Setisolatorsonoor,housekeepingpad,orsub-
base, ensuring that all isolator center lines match
the equipment mounting holes. The VMC group
recommends that the isolator base plates (“B”) be
installed on a level surface. Shim or grout as re-
quired, leveling all isolator base plates to the same
elevation (1/4
th
of an inch maximum difference
can be tolerated).
4. Bolt or anchor all isolators to supporting structure
utilizing base plate thru holes (“C”) or weld base
plate to supporting structure with 3/8
th
llet weld
2 inches long @ 4 inches on center around entire
baseplateorasengineeredforspecicloadandor
eldconditions.
5. Isolators are shipped to the job site with (2) re-
movable spacer shims (“E”) between the top plate
and the housing. These shims must be in place
when the equipment is positioned over the isola-
tors.
6. With all shims (“E”) in place, position equipment
on top of plate (“A”) of isolator. Bolt equipment
securely to top plate of isolator using a minimum
of (2) 5/8
th
of an inch
UNC A325 grade 5 SAE
bolts or weld equipment or bracket to the top plate
(“A”) of isolator with a minimum of 3/8
th
of an
inchlletwelds2incheslong@3inchesoncen-
ter for a minimum total weld of 10 inches. (All
sides of equipment or bracket resting on top plate
(“A”) must be welded).
7. The adjustment process can only begin after the
equipment or machine is at its full operating
weight.
8. Back off each of the (4) limit stop lock nuts (“F”)
on isolators 1/2 of an inch.
9. Adjust each isolator in sequence by turning spring
adjusting nuts (“G”) one full clockwise turn at a
time. Repeat this procedure on all isolators, one
at a time. Check the limit stop lock nuts (“F”)
periodically to ensure that clearance between the
washer and rubber grommet is maintained. Stop
adjustment of isolator only when the top plate
(“A”) has risen just above the shim (“E”).
10. Remove all spacer shims (“E”).
11. Fine adjust isolators to level equipment.
12. Adjust all limit stop lock nuts (“F”) per isolator,
maintaining 1/4
th
of an inch to 3/8
th
of an inch gap.
The limit stop nuts must be kept at this gap to
ensure uniform bolt loading during uplift (as the
case when equipment is drained).
13. Installation is complete.
LD13763B
WASHER
("F")
("B")
GROMMET
("G")
("A")
("C")
("F")
("E")
("E")
("E")
1/4 - 3/8 GAP
C
L
C
L
("C")
EQUIPMENT
("A")
FIGURE 36 - SEISMIC ISOLATOR INSTALLATION AND ADJUSTMENT
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