Trane Rtaaiom3 Manual

41RTAA-IOM-3
Evaporator Piping
Figure 22 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.
The chilled water connections are on
the left side of the unit. If it is necessary
for the...

42RTAA-IOM-3
Evaporator Piping
Components
“Piping components” include all
devices and controls used to provide
proper water system operation and
unit operating safety. These
components and their general
locations are given below.
Entering Chilled Water Piping
[  ] Air vents (to bleed air from system).
[  ] Water pressure gauges with shutoff
valves.
[  ] Vibration eliminators.
[  ] Shutoff (isolation) valves.
Thermometers (if desired).
[  ] Clean-out tees.
[  ] Pipe strainer.
Caution: To prevent tube...

43RTAA-IOM-3
3. Adjust the switch to open when
water flow falls below nominal.
Evaporator data is shown in Figure
23. Refer to Table 1 for minimum
flow recommendations. Flow switch
contacts are closed on proof of water
flow.4. Install a pipe strainer in the entering
evaporator water line to protect
components from waterborne
debris.
Figure 23
RTAA 130 thru 400
Evaporator Water Pressure Drop 

44RTAA-IOM-3
Water Treatment
Using untreated or improperly treated
water in these units may result in
inefficient operation and possible tube
damage. Consult a qualified water
treatment specialist to determine
whether treatment is needed. The
following disclamatory label is
provided on each RTAA unit:
Customer Note
The use of improperly treated or
untreated water in this equipment may
result in scaling, erosion, corrosion,
algae or slime. The services of a
qualified water treatment specialist
should be...

45RTAA-IOM-3
Domestic Water Heater
Piping
Figure 24 illustrates typical domestic
water heater piping components.
Components and layout will vary
slightly, depending on the location of
connections and the water source. See
unit submittals to insure identification
of water inlet and outlet connections.
Be sure to provide additional vents at
high points in the piping to bleed air
from the water system.
Caution: To prevent damage to
components, do not allow
domestic water heater pressure
(maximum working...

46RTAA-IOM-3
Figure 24
Typical Domestic Water
Heater Piping
Figure 25
Typical Domestic Water
Heater Piping 

47RTAA-IOM-3
Installation - Mechanical
Remote Evaporator Interconnecting
Refrigerant Piping.
General
The RTAA outdoor unit with the
Remote Evaporator option is shipped
as two pieces: the outdoor unit
(condensing) and the evaporator. The
outdoor unit includes a suction
accumulator line on each circuit and
has the field connections for the
refrigerant at the end opposite the
control panel.
The evaporator is shipped complete
with factory-mounted refrigeration
specialties (electronic expansion
valves,...

48RTAA-IOM-3
A. The line sizes established in this
installation manual are to be used only
for 40-50 F leaving water temperature
and full-load ice-making applications.
B. The evaporator can be mounted
only on the SAME PLANE OR LOWER
PLANE than the outdoor unit. Figure 28
illustrates what not to do. The elevation
difference is to not exceed 100 feet.C. Piping between evaporator and
outdoor unit is to not exceed 200
(linear) feet or an equivalent length
(includes equivalent length pressure
drop of...

49RTAA-IOM-3
E. Horizontal portions of the suction
lines must be downward sloping to the
compressors. Suction lines must be
insulated.
F. Install an inverted trap in the liquid
line when the evaporator is on a lower
plane than the outdoor unit. The apex
of the trap should be at a height above
the top of the condenser coils. See
Figure 27.
G. Install a suction line trap at the
evaporator when the evaporator is on a
lower plane than the outdoor unit. See
Figure 27.H. The evaporator MUST be matched
with its...

50
RTAA-IOM-3
Figure 30 
Refrigerant Circuit Identification