York YLAA0285SE, Manual

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127
JOHNSON CONTROLS
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
SECTION 5 – TECHNICAL DATA
55
SEISMIC ISOLATOR INSTALLATION AND ADJUSTMENT INSTRUCTIONS
1. Read instructions in their entirety before beginning
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-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 bolts or weld
equipment or bracket to the top plate ( “ A”) of isola-
tor with a minimum of 3/8 fillet welds 2" long @
3" on center 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”) periodi-
cally 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 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")
FIG. 55 – SEISMIC ISOLATOR INSTALLATION AND ADJUSTMENT INSTRUCTIONS