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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 spe-
cialist to determine whether a treatment is needed. The
following disclamatory label is provided on each
RTAA/RTAB unit.
Customer note
This is designed for chilled water or chilled water with
glycol.The use of improperly treated or untreated water
in this equipment may result in scaling, erosion, corro-
sion, algae or slime. The services of a qualified water
treatment specialist should be engaged to determine
what treatment, if any, is advisable. Société Trane war-
ranty specifically excludes liability for corrosion, erosion
or deterioration of Trane equipment. Trane assumes no
responsabilities for the results of the use of untreated or
improperly treated water, or saline or brackish water.
Caution : Do not use untreated or improperly treated
water equipment damage may occur.
Water pressure gauges
Install field-supplied pressure gauges as shown in figure 8.
Locate pressure gauges or taps in a straight run of pipe ;
avoid placement near elbows, etc. Be sure to install the
gauges at the same elevation.
To read manifolded pressure gauges, open one valve
and close the other (depending upon the reading
desired). This eliminates errors resulting from differently
calibrated gauges installed at unmatched elevations.
Water pressure relief valves
Install a water pressure relief valve in the evaporator
inlet shutoff valve, as shown in figure 8. Refer to applica-
ble codes for relief valve installation guidelines.
Caution : To prevent shell damage, install pressure
relief valves in the evaporator water system.
Freeze protection
If the unit will remain operational at subfreezing ambi-
ent temperatures, the chilled water system must be pro-
tected from freezing, following the steps listed below :
1. Heat tape is factory-installed on the unit evaporator
and will protect it from freezing in ambient tempera-
tures down to -18°C (option).
2. Install heat tape on all water piping pumps, and other
components that may be damaged if exposed to
freezing temperatures. Heat tape must be designed
for low ambient temperature applications. Heat tape
selection should be based on the lowest expected
ambient temperature, including wind chill factors.
If heat tape is not used, add a nonfreezing, low tempera-
ture, corrosion inhibiting, heat transfer fluid to the
chilled water system. The solution must be strong
enough to provide protection against ice formation at
the lowest anticipated ambient temperature. Refer to
table 1 for evaporator water storage capacities.
Note : Use of glycol type antifreeze reduces the cool-
ing capacity of the unit and must be considered in the
design of the system specifications.
14
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