Water Treatment; Water Pressure Gauges; Water Pressure Relief Valves; Field-Installed Water Temperature Sensors - Trane R Series Installation Operation & Maintenance

Installation - Mechanical

Water Treatment

Using untreated or improperly treated water in these units may result in ineffi-
cient 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 RTWA and RTUA unit:
CAUTION
Proper Water Treatment!
The use of untreated or improperly treated water in a Chiller may
result in scaling, erosion, corrosion, algae or slime. It is
recommended that the services of a qualified water treatment
specialist be engaged to determine what water treatment, if any,
is required. Trane assumes no responsibility for equipment
failures which result from untreated or improperly treated water,
or saline or brackish water.

Water Pressure Gauges

Install field-supplied pressure gauges (with manifolds, whenever practical) on
the RTWA and RTUA units, as shown in Figures 15, 19 and 20. 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 condenser and evaporator leaving
chilled water piping. See Figures 15, 19 and 20. Water vessels with close
coupled shutoff valves have a high potential for hydrostatic pressure buildup
on a water temperature increase. Refer to applicable codes for relief valve
installation guidelines.
CAUTION
Prevent Shell Damage!
To prevent shell damage, install pressure relief valves in both the
evaporator and condenser water systems.

Field-Installed Water Temperature Sensors

Entering and leaving evaporator water temperature sensors (6RT7 , 6RT8) are
factory installed on all units, excluding the RTCA. Entering and leaving
condenser water temperature sensors are factory installed in the condenser
water boxes, if the "Condenser Water Temperature Sensor Kit" is ordered
with the unit (RTWA only).

Water Sensor Installation Procedure

If field installation is required, the sensors must be properly located to read a
mixed water temperature. An installed sensor and fitting is illustrated in
Figure 22.
1. Cut a properly-sized hole in the piping and weld a 1/4" NPT 150 psig half-
coupling (field-provided) into the piping at each sensor location.
2. Using teflon tape, install the entire sensor compression fitting into the
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