Specifications

42
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
TECHNICAL DATA
50 MM (SEISMIC) ISOLATOR INSTALLATION AND ADJUSTMENT
WASHER
("F")
("B")
GROMMET
("G")
("A")
("C")
("F")
("E")
("E")
("E")
1/4 - 3/8 GAP
C
L
C
L
("C")
EQUIPMENT
("A")
1. Read the following instructions before beginning instal-
lation.
2. Isolators are shipped fully assembled and are to be
positioned in accordance with the submittal drawings
or as otherwise reccomended.
3. Set isolators on fl oor, housekeeping pad, or sub-base,
ensuring that all isolator centerlines match the equip-
ment mounting holes. The VMC group recommends
that the isolator base plates (“B”) be installed on a level
surface. Shim or grout as required, leveling all isolator
base plates to the same elevation (0.25-inch maximum
difference can be tolerated).
4. Bolt or anchor all isolators to supporting structure uti-
lizing base plate thru holes (“C”) or weld base plate to
supporting structure with 0.375" fi llet weld 2” long @
4” on centre around entire base plate or as engineered
for specifi c load and or fi eld conditions.
5. Isolators are shipped to the job site with (2) removable
spacer shims (“E”) between the top plate and the hous-
ing. These shims must be in place when the equipment
is positioned over the isolators.
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 x 0.625"
UNC A325 GRADE 5 SAE bolts or weld equipment
or bracket to the top plate (“A”) of isolator with a
minimum 0.375" fi llet welds 2” long @ 3” O.C. for a
minimum total weld of 10”. (All sides of equipment
or bracket resting on top plate (“A”) must be welded).
7. The adjustment process can only begin after the equip-
ment 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”.
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, main-
taining 0.25-to 0.375-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).