JOHNSON CONTROLS
94
SECTION 5 - TECHNICAL DATA
Form 201.28-NM1.1
Issue date: 08/06/2021
Two inch deflection, isolator installation and adjustment
WASHER
("F")
("B")
GROMMET
("G")
("A")
("C")
("F")
("E")
("E")
("E")
1/4 - 3/8 GAP
CL
CL
("C")
EQUIPMENT
("A")
Read the following instructions before beginning
installation.
1. Isolators are shipped fully assembled and are to be
positioned in accordance with the submittal draw-
ings or as otherwise recommended.
2.
Set isolators on floor, housekeeping pad, or sub-
base, ensuring that all isolator centerlines 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
required, levelling all isolator base plates to the
same elevation (0.25 of an inch maximum differ
-
ence can be tolerated).
3. Bolt or anchor all isolators to supporting structure
utilizing base plate through holes (“C”) or weld
base plate to supporting structure with 0.375 in.
fillet weld 2 in. long @ 4 in. on center around en
-
tire base plate or as engineered for specific load
and or field conditions.
4. 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.
5. With all shims (“E”) in place, position equipment
on top of plate (“A”) of isolator.
6. Bolt equipment securely to top plate of isolator
using a minimum of 2 x 0.625 in. UNC A325
GRADE 5 SAE bolts or weld equipment or brack-
et to the top plate (“A”) of isolator with a mini-
mum 0.375 in. fillet welds 2 in. long @ 3 in. O.C.
for a minimum total weld of 10 in. (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
the isolators 0.5 in.
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 0.25 in. to 0.375 in. gap. The limit
stop nuts must be kept at this gap to ensure uni-
form bolt loading during uplift, as is the case
when the equipment is drained.
