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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.
N N o o t t e e : : 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.
27. 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.
I I m m p p o o r r t t a a n n t t : : 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.
N N O O T T I I C C E E
P P r r o o p p e e r r W W a a t t e e r r T T r r e e a a t t m m e e n n t t R R e e q q u u i i r r e e d d ! !
T T h h e e u u s s e e o o f f u u n n t t r r e e a a t t e e d d o o r r i i m m p p r r o o p p e e r r l l y y t t r r e e a a t t e e d d w w a a t t e e r r
c c o o u u l l d d r r e e s s u u l l t t i i n n s s c c a a l l i i n n g g , , e e r r o o s s i i o o n n , , c c o o r r r r o o s s i i o o n n , , a a l l g g a a e e o o r r
s s l l i i m m e e . .
U U s s e e t t h h e e s s e e r r v v i i c c e e s s o o f f a a q q u u a a l l i i f f i i e e d d w w a a t t e e r r t t r r e e a a t t m m e e n n t t
s s p p e e c c i i a a l l i i s s t t t t o o d d e e t t e e r r m m i i n n e e w w h h a a t t w w a a t t e e r r t t r r e e a a t t m m e e n n t t , , i i f f
a a n n y y , , i i s s r r e e q q u u i i r r e e d d . . T T r r a a n n e e a a s s s s u u m m e e s s n n o o r r e e s s p p o o n n s s i i b b i i l l i i t t y y
f f o o r r e e q q u u i i p p m m e e n n t t f f a a i i l l u u r r e e s s w w h h i i c c h h r r e e s s u u l l t t f f r r o o m m u u n n t t r r e e a a t t e e d d
o o r r i i m m p p r r o o p p e e r r l l y y t t r r e e a a t t e e d d w w a a t t e e r r , , o o r r s s a a l l i i n n e e o o r r b b r r a a c c k k i i s s h h
w w a a t t e e r r . .
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.
24
Valves—Drains and Vents
N N O O T T I I C C E E
W W a a t t e e r r b b o o x x D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s c c o o u u l l d d r r e e s s u u l l t t i i n n
d d a a m m a a g g e e t t o o t t h h e e w w a a t t e e r r b b o o x x . .
D D o o n n o o t t o o v v e e r r - - t t i i g g h h t t e e n n o o r r u u s s e e e e x x c c e e s s s s i i v v e e T T e e f f l l o o n n ® ® p p i i p p e e
t t a a p p e e w w h h e e n n i i n n s s t t a a l l l l i i n n g g v v a a l l v v e e s s , , d d r r a a i i n n s s , , p p l l u u g g s s a a n n d d
v v e e n n t t s s o o n n w w a a t t e e r r b b o o x x e e s s . .
1. Install field-supplied air vents and drain valves on
the waterboxes. Each waterbox is provided with a
National Pipe Thread Female (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).
N N O O T T I I C C E E
W W a a t t e e r r b b o o x x D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s c c o o u u l l d d r r e e s s u u l l t t i i n n
d d a a m m a a g g e e t t o o t t h h e e w w a a t t e e r r b b o o x x d d u u e e t t o o h h y y d d r r o o s s t t a a t t i i c c
e e x x p p a a n n s s i i o o n n . .
I I n n s s t t a a l l l l p p r r e e s s s s u u r r e e - - r r e e l l i i e e f f v v a a l l v v e e s s i i n n t t h h e e c c o o n n d d e e n n s s e e r r
a a n n d d e e v v a a p p o o r r a a t t o o r r w w a a t t e e r r c c i i r r c c u u i i t t s s . .
N N O O T T I I C C E E
E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s c c o o u u l l d d r r e e s s u u l l t t i i n n
e e q q u u i i p p m m e e n n t t d d a a m m a a g g e e . .
D D o o N N O O T T a a l l l l o o w w c c h h i i l l l l e e r r t t o o f f r r e e e e z z e e ! ! B B u u n n d d l l e e s s m m u u s s t t
b b e e d d r r a a i i n n e e d d a a n n d d a a i i r r - - b b l l o o w w n n d d r r y y i i f f c c h h i i l l l l e e r r i i s s s s t t o o r r e e d d
i i n n a a n n u u n n h h e e a a t t e e d d e e q q u u i i p p m m e e n n t t r r o o o o m m . .
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.
CDHF-SVX01N-EN
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