23
CVHE-SVN01C-EN
General Information
Spring Isolators
Spring isolators should be
considered whenever chiller
installation is planned for an upper
story location. Base isolator selection
and placement on the information
presented in Figures 8 and 9. (Notice
that three types of spring isolators,
each with their own maximum
loading characteristics, are used with
the CVHE/F/G chillers.)
Spring isolators typically ship
assembled and ready for installation.
To install and adjust the isolators
properly, follow the instructions
given.
Note:
Do not adjust the isolators
until the chiller is piped and charged
with refrigerant and water.
1. Position the spring isolators under
the chiller as shown in Figures 7
and 8. Make sure that each isolator
is centered in relation to the tube
sheet.
2. Set the isolators on the sub-base;
shim or grout as necessary to
provide a flat, level surface at the
same elevation for all mountings.
Be sure to support the full
underside of the isolator base
plate; do not straddle gaps or
small shim.
3. If required, bolt the isolators to the
floor through the slots provided or
cement the pads.
Note: Fastening the isolators to the
floor is not necessary unless
specified.
4. If the chiller must be fastened to
the isolators, insert cap screws
through the chiller base and into
the holes tapped in the upper
housing of each isolator. However,
do not allow the screws to
protrude below the underside of
the isolator upper housing. An
alternative method of fastening
the chiller to the isolators is to
cement the neoprene pads.
5. Set the chiller on the isolators;
refer to “Rigging” for listing
instructions.
The weight of the chiller will force
the upper housing of each isolator
down, perhaps causing it to rest
on the isolator’s lower housing.
Figure 9 illustrates spring isolator
construction.
6. Check the clearance on each
isolator. If this dimension is less
than ¼ inch on any isolator, use a
wrench to turn the adjusting bolt
one complete revolution upward.
Repeat this operation until a ¼
inch clearance is obtained at one
or more isolators.
Note:
When the load is applied to
the isolators (Step 5), the top plate
of each isolator moves down to
compress the springs until either:
(1) The springs support the load, or
(2) The top plate rests on the
bottom housing of the isolator.
a. If the springs are supporting
the load, screwing down on
the adjusting bolt (Step 7)
will immediately begin to
raise the chiller.
7. Turn the adjusting bolt on each of
the remaining isolators to obtain
the required minimum clearance
of ¼" [6.9 mm].
8. Once the minimum required
clearance is obtained on each of
the isolators, level the chiller by
turning the adjusting bolt on each
of the isolators on the low side of
the unit. Be sure to work from one
isolator to the next. Remember
that the chiller must be level to
within 1/16" [1.6 mm] over its
length and width, and that
clearance of each isolator must be
¼" [6.9 mm].
