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Installation: Water Piping
Notes:
•
Some type of field-supplied temperature control
device may be required to regulate the
temperature of the heat-recovery condenser
water circuit. For application recommendations,
refer to Heat Recovery Seminar (Part 2):
Systems/Equipment (AM-FND-8).
•
Install a bypass valve system to avoid
circulating water through the auxiliary shell
when the unit is shutdown.
•
On multiple-pass condensers, entering
condenser water must enter at the lowest
nozzle.
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.
Water piping connection sizes and components are
identified in the tables in
"Water Piping Connections," p. 34
and
"Grooved Pipe Coupling," p.
many waterboxes, the entering and leaving evaporator
water can be piped to either waterbox connection when the
tube bundles are split vertically. However, large evaporator
waterboxes with entering and leaving connections not at
the same 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.
Important: 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.
34
35. Remember that with
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 CenTraVac™ Water-cooled Chillers
Models CDHF, CDHG, CVHE, CVHF, CVHG Condenser
Water Temperature Control Engineering Bulletin (CTV-
PRB027*-EN).
Notes:
•
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.).
Note: 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
Nominal Pipe Size
EVSZ
(a)
1-Pass
in.
mm
032
8
219.1
050
10
273.0
080
12
323.9
142
16
406.4
210
16
406.4
250
16
406.4
(a)
EVSZ = Evaporator Shell Size; S = Short Shell, L = Long Shell, E = Extended
Shell
2-Pass
3-Pass
in.
mm
in.
mm
6
168.3
5
141.3
8
219.1
6
168.3
10
273.0
8
219.1
12
323.9
10
273.0
14
355.6
12
323.9
14
355.6
12
323.9
CVHE-SVX005C-EN
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