Trane Duplex Water-Cooled Hermetic CenTraVac, Installation Manual

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CDHF-SVN01B-EN
Water Piping
Overview
Several water piping circuits must be
installed and connected to the chiller.
Note: Field piping must be arranged
and supported to avoid stress on the
equipment. It is strongly
recommended that the piping
contractor refrain from piping closer
than 3’-0” minimum to the
equipment. This will allow for proper
fit-up upon arrival of the unit at the
job-site. Any adjustment that is
necessary can be made to the piping
at that time.
1. Pipe the evaporator into the chilled
water circuit.
2. Pipe the condenser into the
cooling tower water circuit. Piping
suggestions for each of the water
circuits listed above are outlined
later in this section. 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
Since the use of untreated or
improperly treated water in a
CenTraVac
™ may result in inefficient
operation and possible tube
damage, be sure to engage the
services of a qualified water
treatment specialist if needed. A
label with the following disclamatory
note is affixed to each CDHF 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 specialists should
be engaged to determine what
treatment, if any, is advisable. The
Trane warranty specifically excludes
liability for corrosion, erosion, or
deterioration of Trane equipment,
Trane assumes no responsibilities
for the results of the use of untreated
or improperly treated water, or saline
or brackish water.”
CAUTION
Water Treatment!
Do not use untreated or improperly
treated water, or equipment
damage may occur.
Pressure Gauges
Locate pressure gauge taps in a
straight run of pipe. Place tap a
minimum of one pipe diameter
downstream of any elbow, orifice
etc. Example, for a 6” pipe, the tap
would be at least 6” from any elbow,
orifice, etc.
Valves
1. Install field-supplied air vents and
drain valves on the water boxes.
Each water box is provided with a
3/4” NPTF vent and drain
connection.
Plastic plugs are factory-installed in
both openings for shipment;
remove and discard these plugs as
you install the water box vents
and drain valves.
2. If necessary for the application,
install pressure-relief valves at the
drain connections on the
evaporator and condenser water
boxes. To do so, add a tee with the
relief valve attached to the drain
valve. 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 hydro-
static pressures as fluid
temperature rises; and,
b) Relief valves are required by
ASME codes when the shell
waterside is ASME. Consult
guidelines or other applicable
codes to assure proper relief
valve installation.
CAUTION
Overpressurization!
Failure to install pressure-relief
valves in the condenser and
evaporator water circuits may result
in shell damage due to hydrostatic
expansion.
Strainers
Install a strainer in the entering side
of each piping circuit to avoid
possible tube plugging in the chiller
with debris.
CAUTION
Tube Damage!
Failure to install strainers in all water
piping entering the chiller can result
in tube plugging conditions that
damage unit components.
Flow-Sensing Devices
Use either flow switches or
differential pressure switches in
conjunction with the pump interlocks
to verify evaporator and condenser
water flows.
To assure adequate chiller
protection, wire the chilled-water
and condenser-water flow switches
in series with the appropriate water
pump interlock. Refer to the wiring
diagrams that shipped with the unit
for specific electrical connections.