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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 tower 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 3 ft (0.9 m) 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.
33. General recommendations for the
installation of field-supplied piping components (e.g.,
valves, flow switches, etc.) common to most chiller water
circuits are listed in the following sections.
Water Treatment
The use of untreated or improperly treated water in a
CenTraVac™ chiller 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.
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water
could result in scaling, erosion, corrosion, algae or
slime.
Use the services of a qualified water treatment
specialist 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
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
6 in. (16 cm) pipe, the tap would be at least 6 in. (16 cm)
from any elbow, orifice, etc.
30
Valves – Drains and Vents
NOTICE
Waterbox Damage!
Failure to follow instructions could result in damage
to the waterbox.
Do not over-tighten or use excessive Teflon® pipe
tape when installing valves, drains, plugs and vents
on waterboxes.
1. Install field-supplied air vents and drain valves on the
waterboxes. Each waterbox is provided with a National
Pipe Thread (NPTF) vent and drain connection;
depending on the waterbox types ordered, the
openings may be 1/4 in. (6.35 mm), 1/2 in. (12.7 mm),
or 3/4 in. (19.05 mm).
NOTICE
Waterbox Damage!
Failure to follow instructions could result in
damage to the waterbox due to hydrostatic
expansion.
Install pressure-relief valves in the condenser and
evaporator water circuits.
NOTICE
Equipment Damage!
Failure to follow instructions could result in
equipment damage.
Do NOT allow chiller to freeze! Bundles must be
drained and air-blown dry if chiller is stored in an
unheated equipment room.
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.
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
shell waterside is ASME. Follow ASME guidelines
or other applicable codes to ensure proper relief
valve installation.
CVHE-SVX005C-EN
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