CVHE-SVX02M-EN
31
level must be connected with the entering water at the
bottom and the leaving water at the top.
Waterboxes with multiple pass arrangements utilize a
baffle to separate the passes. These baffles are
designed for a maximum pressure of 20 psid
(137.9 kPaD). If larger pressure drops are expected in
the application, contact your local Trane representative
to discuss special waterbox options.
IImmppoorrttaanntt:: Water flows must be piped in accordance
with nameplate designation.
Field-provided isolation valves for the evaporator and
condenser water lines should be installed upstream
and downstream of the heat exchangers, and be
installed far enough away from the chiller to also
provide practical service isolation for flow sensing
devices, field thermometers, flexible connectors, and
any removable pipe spools.
Ensure that the evaporator water piping is clear; check
it after the chilled water pump is operated but before
initial chiller start-up. If any partial blockages exist, they
can be detected and removed to prevent possible tube
damage resulting from evaporator freeze-up or
erosion.
For condenser and large evaporator connections,
arrange the water piping so that the water supply
enters the shell at the lower connection and exits from
the top connection. Operational problems may result if
this piping is not correct. Some shells may be piped as
desired since both connections are at the same level.
For applications that include an “infinite source” or
“multiple-use” cooling condenser water supply, install
a valved bypass “leg” (optional) between the supply
and return pipes. This valved bypass allows the
operator to short-circuit water flow through the cooling
condenser when the supply water temperature is too
low. For additional application information, refer to
Engineering Bulletin: Condenser Water Temperature
Control - For CenTraVac Centrifugal Chiller Systems
with Tracer AdaptiView Controls (CTV-PRB006*-EN).
NNootteess::
• System refrigerant pressure differential
must be maintained above 3 psid
(20.7 kPaD) at all times. Failure to do so
could result in operating problems.
• Whenever a CVHE, CVHF, or CVHG
CenTraVac
™
chiller is equipped with an
auxiliary condenser, use a bypass valve
system to avoid circulating water through
the auxiliary shell during unit shut-down.
Water Piping Connections
All standard units use grooved-pipe connections.
These are grooved-end NSP (Victaulic® style) pipe
connections. Flanged connections are optional.
Piping joined using grooved type couplings, like all
types of piping systems, requires proper support to
carry the weight of pipes and equipment. The support
methods used must eliminate undue stresses on joints,
piping, and other components, allow movement where
required, and provide for any other special
requirements (i.e., drainage, etc.).
NNoottee:: If needed, plug-type sensor extension cables are
available for purchase from Trane Parts Service.
These sensor extension cables may be necessary
if the waterboxes are changed or if the
temperature sensors are moved out into the unit
piping for better mixed temperature readings.
Table 6. Evaporator water piping connection sizes
EVSZ
(a)
Nominal Pipe Size
1-Pass 2-Pass 3-Pass
in.
mm
in.
mm
in.
mm
032 8 219.1 6 168.3 5 141.3
050 10 273.0 8 219.1 6 168.3
080 12 323.9 10 273.0 8 219.1
142 16 406.4 12 323.9 10 273.0
210 16 406.4 14 355.6 12 323.9
250 16 406.4 14 355.6 12 323.9
(a)
EVSZ = Evaporator Shell Size; S = Short Shell, L = Long Shell, E =
Extended Shell
Table 7. Condenser water piping connection sizes
CDSZ
(a)
Nominal Pipe Size
2-Pass
in.
mm
032 6 168.3
050 8 219.1
080 10 273.0
142 12 323.9
210 14 355.6
250 14 355.6
(a)
CDSZ =Condenser Shell Size; S = Short Shell, L = Long Shell, E =
Extended Shell
IInnssttaallllaattiioonn:: WWaatteerr PPiippiinngg
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