Installation: Water Piping
CVHH-SVX001A-EN
25
Evaporator and Condenser Water
Piping
Figure 12
and
Figure 13, p. 25
illustrate the recom m ended
(typical) water piping arrangem ents for the evaporator
and condenser.
Piping m ust be arranged and supported to avoid stress on
the equipm ent. It is strongly recom m ended that the piping
contractor does not run pipe closer than 0.91 m eters
(3 feet) m inim um to the equipm ent. This w ill allow for
proper fit upon arrival of the unit at the job site. Any
adjustm ent that is necessary can be m ade to the piping at
that tim e. Expenses that result from a failure to follow this
recom m endation w ill not be paid by Trane.
Water piping connection sizes and com ponents are
identified in
Table 4, p. 26
and
Table 5, p. 27
. Rem em ber
that w ith m any waterboxes the entering and leaving
evaporator water can be piped to either waterbox
connection w hen the tube bundles are split vertically.
How ever, large evaporator waterboxes, w ith entering and
leaving connections not at the sam e level, m ust be
connected w ith the entering water at the bottom and the
leaving water at the top.
Waterboxes w ith m ultiple pass arrangem ents utilize a
baffle to separate the passes. These baffles are designed
for a m axim um pressure of 137.9 kPad (20 psid). If larger
pressure drops are expected in the application, contact
your local Trane representative to discuss special
waterbox options.
Im port ant :
Water flow s m ust be piped in accordance
w ith nam eplate designation.
Field-provided isolation valves for the evaporator and
condenser water lines should be installed upstream and
dow nstream of the heat exchangers, and be installed far
enough away from the chiller to also provide practical
service isolation for flow sensing devices, field
therm om eters, flexible connectors, and any rem ovable
pipe spools.
Ensure that the evaporator water piping is clear, check it
after the chilled water pum p is operated but before initial
chiller start-up. If any partial blockages exist, they can be
detected and rem oved to prevent possible tube dam age
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 low er connection, and exits from the top connection.
Operational problem s m ay result if this piping is not
correct. Som e shells m ay be piped as desired since both
connections are at the sam e level.
For applications that include an “ infinite source” or
“ m ultiple-use”, cooling condenser water supply, install a
valved bypass “ leg” (optional) betw een the supply and
return pipes. This valved bypass allow s the operator to
short-circuit water flow through the cooling condenser
w hen the supply water tem perature is too low.
N ot e: System refrigerant pressure differential m ust be
m aintained above 20.7 kPad (3 psid) at all tim es.
Failure to do so could result in operating problem s.
Figure 12.
Typical evaporator water piping circuit
1.
Balancing Valve
2.
Gate (Isolation) Valve or Ball
Valve
3.
Therm om eter (if field supplied)
4.
Waterbox Nozzle Connection
5.
Drain, Vent, Anode
6.
Strainer
7.
Chilled Water Flow Sw itch
(4B4)
(a)
8.
Pum p
9.
Pressure Gauge
(b)
( a) Flow sw it ch 4B4 m ay be inst alled in eit her t he ent er ing or leav ing leg
of t he chilled w at er circuit .
( b) I t is recom m ended t o pipe t he gauge bet w een ent ering and leav ing
pipes. A shut off valve on each side of t he gauge allow s t he operat or t o
r ead eit her ent er ing or leav ing wat er pr essur e.
Figure 13.
Typical condenser water piping circuits
1.
Balancing Valve
2.
Gate (Isolation) Valve or Ball
Valve
3.
Therm om eter (if field supplied)
4.
Waterbox Nozzle Connection
5.
Drain, Vent, Anode
6.
Strainer
7.
Condenser Water Flow
Sw itch (4B5)
(a)
8.
3-Way Valve (Optional)
9.
Condenser Water Pum p
10. Pressure Gauge
(b)
( a) Flow sw it ch 4B5 m ay be inst alled in eit her t he ent er ing or leav ing leg
of t he wat er cir cuit .
( b) I t is recom m ended t o pipe a single gauge bet w een ent er ing and leaving
pipes.
Notes:
1 . Som e t y pe of field- supplied t em perat ur e cont r ol dev ice m ay be
requir ed t o regulat e t he t em perat ur e of t he heat - recover y condenser
wat er cir cuit . For applicat ion r ecom m endat ions, r efer t o Heat
Recover y Sem inar ( Par t 2) : " Syst em s/ Equipm ent ( AM- FND- 8) .
2 . I nst all a bypass valve syst em t o avoid circulat ing wat er t hrough t he
aux iliar y shell when t he unit is shut down.
3 . On m ult iple pass condensers, ent er ing condenser wat er m ust ent er at
t he low est nozzle.
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4
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1
9
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8
Out let
I nlet
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9
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10
Out let
I nlet
Summary of Contents for CVHH
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