22 CVHH-SVX001A-EN
Installation: Water Piping
Overview
The following water piping circuits must be installed and
connected to the chiller:
• Pipe the evaporator into the chilled water circuit.
• Pipe the condenser into the cooling tow er water circuit.
• Optional: A heat-recovery condenser water circuit.
• Optional: An auxiliary condenser water circuit.
Note: Piping must be arranged and supported to avoid
stress on the equipment. It is strongly
recommended that the piping contractor does not
run pipe closer than 0.91 m (3 feet) minimum to the
equipment. This will allow for proper fit upon
arrival of the unit at the job site. Any adjustment
that is necessary can be made to the piping at that
time. Expenses that result from a failure to follow
this recommendation will not be paid by Trane.
Piping suggestions for each of the water circuits listed
above are outlined in
“ Evaporator and Condenser Water
Piping,” p. 25
. General recommendations for the
installation of field supplied piping components (e.g.,
valves, flow switches, etc.) common to most chiller water
circuits are listed below.
Water Treatment
The use of untreated or improperly treated water in a
CenTraVac may result in inefficient operation and possible
tube damage.
Important: Trane strongly recommends using the
services of a qualified water treatment
specialist to determine necessary water
treatment. A label with a customer
disclaimer note is affixed to each unit.
Pressure Gauges
Locate pressure gauge taps in a straight length of pipe.
Place each tap a minimum of one pipe diameter
downstream of any elbow, orifice, etc. For example, for a
152.4 mm (6 in.) pipe, the tap would be at least 152.4 mm
(6 in.) from any elbow, orifice, etc.
Valves—Drains and Vents
1. Install field-supplied air vents and drain valves on the
waterboxes. Each waterbox is provided with a National
Pipe Thread Female (NPTF) vent and drain connection;
the openings are 19.05 mm (3/4 in.).
2. If necessary for the application, install pressure-relief
valves at the drain connections on the evaporator and
condenser waterboxes. To do so, add a tee with the
relief valve attached to the drain valve. Follow local
codes for determining if drain connection is large
enough for relief devices.
To determine whether or not pressure relief valves are
needed for a specific application, keep in mind that:
a. Vessels with close-coupled shutoff valves may
cause high potentially damaging hydrostatic
pressures as fluid temperature rises.
b. Relief valves are required by American Society of
Mechanical Engineers (ASME) codes when the
waterside is ASME. Follow ASME guidelines or
other applicable codes/local regulation to ensure
proper relief valve installation.
Strainers
Install a strainer in the entering side of each piping circuit
to avoid possible tube plugging in the chiller with debris.
Required Flow-Sensing Devices
The ifm efector
®
flow detection controller and sensor (see
“ Water Flow Detection Controller and Sensor—ifm
NOTICE:
Proper Water Treatment!
Trane assumes no responsibility for equipment failures
which result from untreated or improperly treated
water, or saline or brackish water. The use of untreated
or improperly treated water in a CenTraVac could 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.
NOTICE:
Waterbox Damage!
Failure to follow instructions could result in damage to
the waterbox. Do not over-tighten or use excessive
Te f l o n
®
pipe tape when installing valves, drains, plugs
and vents on waterboxes.
NOTICE:
Over-pressurization!
Failure to install pressure-relief valves in the condenser
and evaporator water circuits could result in waterbox
damage due to hydrostatic expansion.
NOTICE:
Tube Damage!
Failure to install strainers in all water piping entering
the chiller could result in tube plugging conditions that
damage unit components.
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