Water Piping - Trane RTRA Series Installation Operation & Maintenance

Unit isolation and leveling
If the unit application requires maximum sound and vibra-
tion reduction, use one of the two mounting methods out-
lined below :
1. Construct an isolated concrete pad for the unit or pro-
vide concrete footings at each of the 6 unit mounting
points. Mount the unit directly to the concrete pads or
footings.
Level the unit the base rail as a reference. The unit must
be level within 1/4" (6 mm) over the entire length. Use
shims as necessary to level the unit.
2. Install the optional spring isolators at each of the eight
unit mounting points. Refer to submittals isolator place-
ment locations and loading information.
a. Secure the isolators to the mounting surface, using the
mounting slots in the isolator base plate. Do not ful-
ly tighten the isolator mounting bolts at this time.
b. Positioning pins are located on the top of each isola-
tor, as shown in submittals. Lower the unit onto the
isolators so that the pins register with the unit mount-
ing holes.
c. The weight of the unit will force the upper housing of
each isolator down. This may cause the upper hous-
ing to contact the lower housing. Clearances between
upper and lower housings must be 1/4 to 1/2 inch (6-
12 mm). If the clearance on any isolators is greater
than 1/2 inch (6 mm), 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 clear-
ance. 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 grounting under the iso-
lators, 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.

Water piping

Thoroughly flush all water piping to the unit before mak-
ing 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 condensa-
tion, 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.
Evaporator piping
Figure 8 illustrates typical evaporator piping components.
Components and layout will vary slightly, depending on the
location of connections and the water source.
Caution : The chilled water connections to the evaporator
are to be «Victaulic» type connections. Do not attempt
to weld these connections, as the heat generated from
welding can cause internal damage to the evaporator.
A vent is provided on the top of the evaporator at the return
end. Be sure to provide additional vents at high points in
the piping to bleed air from the chilled water system. Install
necessary pressure gauges to monitor the entering and
leaving chilled water pressures.
Provide shutoff valves in lines to the gauges to isolate
them from the system when they are not in use. Use rub-
ber vibration eliminators to prevent vibration transmis-
sion through the water lines.
If desired, install thermometers in the lines to monitor
entering and leaving water temperatures. Install a balanc-
ing valve in the leaving water line to control water flow
balance. Install shutoff valves on both the entering and
leaving water lines so that the evaporator can be isolated
for service.
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