York YLUA0248 Series Installation Operation & Maintenance page 86

SECTION 5 – TECHNICAL DATA
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 re-
quired, leveling all isolator base plates to the same
elevation (1/4-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 Fillet weld
2" long @ 4" on center around entire base plate or
as engineered for specific load and or field condi-
tions.
5. Isolators are shipped to the job site with (2) remov-
able spacer shims ("E") between the top plate and
the housing. 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) 5/8 UNC A325 grade 5 SAE bolt or weld
("A")
86
("G") ("E")
("E")
C L
equipment or bracket to the top plate ("A") of iso-
lator with a minimum 3/8 fillet 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
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".
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-to 3/8-inch gap. The limit stop
nuts must be kept at this gap to ensure uniform
bolt loading during uplift (as the case when equip-
ment is drained).
13. Installation is complete.
("A")
GROMMET
1/4 - 3/8 GAP
("F")
WASHER
("F")
("C")
("C")
("B")
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
C L
EQUIPMENT
("E")
LD13763A
JOHNSON CONTROLS