36
RTAA-IOM-3
Unit Isolation and
Leveling
For additional reduction of sound and
vibration, use one of the two mounting
methods outlined below:
1. Construct an isolated concrete pad
for the unit or provide concrete
footings at each of the eight unit
mounting points. Mount the unit
directly to the concrete pads or
footings. Level the unit using the
base rail as a reference. The unit
must be level within 1/4" over the
entire length. Use shims as
necessary to level the unit.
2. Install the optional spring isolators at
each of the eight/ten unit mounting
points. Refer to Figures 18 thru 21 for
isolator placement locations and
loading information.
a. Secure the isolators to the
mounting surface, using the
mounting slots in the isolator base
plate. Do not fully tighten the
isolator mounting bolts at this
time.
b. Positioning pins are located on the
top of each isolator, as shown in
Figures 18 thru 21. Lower the unit
on to the isolators so that the pins
register with the unit mounting
holes.
c. The weight of the unit will force
the upper housing of each isolator
down. This may cause the upper
housing to contact the lower
housing. As shown in Figures 18
thru 21, the clearances between
upper and lower housings must be
1/4 to 1/2 inch. If the clearance on
any isolator is greater than 1/2
inch, it will be necessary to use
shims or grout to achieve the
required clearance.
d. Minor adjustments can be made
to the clearance by turning the
leveling bolt; clockwise to increase
the clearance and
counterclockwise to decrease the
clearance. All eight isolators must
be supporting the entire weight of
the unit while these adjustments
are being made.
Note: If proper clearances cannot be
achieved using the leveling bolts, use
shims or grouting under the isolators,
as required. Isolators must not straddle
small gaps in the shims or grout.
e. Before tightening the mounting
bolts, level the unit using the unit
base rail as a reference. The unit
must be level within 1/4" over the
entire length. Use the leveling
bolts and/or additional shims or
grout to level the unit.
Evaporator Water Piping
Thoroughly flush all water piping to the
unit before making the final piping
connections to the unit.
Caution: If using an acidic
commercial flushing solution,
construct a temporary bypass
around the unit to prevent damage
to internal components of the
evaporator.
Caution: To avoid possible
equipment damage, do not use
untreated or improperly treated
system water.
When completing the NPT-type water
connections, apply a suitable pipe
sealant, or Teflon tape, to prevent water
leakage. To minimize heat gain and to
prevent condensation, insulate all
piping.
Caution: Avoid overtightening and
possible damage of water
connections. The lubricating
properties of Teflon tape make the
possibility of overtightening more
likely.
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