York YCUL0020, Installation, Operation And Maintenance Manual

Page: 99 / 178

JOHNSON CONTROLS
99
SECTION 5 – TECHNICAL DATA
Form 150.63-NM9
Issue date: 5/20/2021
5
Seismic isolator installation and adjustment
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. 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, leveling all isolator base plates to the
same elevation (1/4-in. 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 fillet weld 2
in. long at 4 in. on center around entire base plate
or as engineered for specific load and or field con -
ditions.
5. Isolators are shipped to the job site with two 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 two 5/8 UNC A325 grade 5 SAE bolts or weld
equipment or bracket to the top plate (“A”) of
isolator with a minimum of 3/8 fillet welds 2 in.
long at 3 in. on center 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 four limit stop lock nuts (“F”)
on isolators 1/2 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”) beforeisola-
tor, maintaining 1/4-in. to 3/8-in. gap. The limit
stop nuts must be kept at this gap to ensure uni-
form 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
CL
CL
("C")
EQUIPMENT
("A")
Figure 37 - Seismic Isolator Installation and Adjustment