Remote Evp Chiller; Water Treatment; Water Flow Limits; Water Temperature Limits - Trane RAUJ-C20 Installation, Operation And Maintenance Manual

I I n n s s t t a a l l l l a a t t i i o o n n M M e e c c h h a a n n i i c c a a l l — — E E V V P P
Figure 39. EVP chiller, typical refrigerant piping
(2 circuit system)
Gauge Ports &
Superheat
Adjustment Port
#1 Suction Line
#2 Suction Line
#1 Liquid Line
#2 Liquid Line

Remote EVP Chiller

Water Treatment

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 . .
The use of untreated or improperly treated water could
result in scaling, erosion, corrosion, and algae or slime
buildup in the heat exchanger. This will adversely
affect system capacity. Proper water treatment must be
determined locally and depends on the type of system
and local water characteristics. Neither salt nor
brackish water is recommend, use of either will lead to
a shortened heat exchanger life. Trane encourages
employment of a qualified water treatment specialist,
familiar with local water conditions, to assist in the
establishment of a proper water treatment program.

Water Flow Limits

N N O O T T I I C C E E
H H e e a a t t E E x x c c h h a a n n g g e e r r a a n n d d C C o o m m p p r r e e s s s s o o r r
D D a a m m a a g g e e ! !
W W a a t t e e r r f f l l o o w w r r a a t t e e s s b b e e y y o o n n d d t t h h e e h h e e a a t t e e x x c c h h a a n n g g e e r r l l i i m m i i t t 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 p p e e r r m m a a n n e e n n t t d d a a m m a a g g e e t t o o t t h h e e h h e e a a t t
e e x x c c h h a a n n g g e e r r a a n n d d / / o o r r c c o o m m p p r r e e s s s s o o r r . .
D D o o n n o o t t o o p p e e r r a a t t e e o o u u t t s s i i d d e e r r e e c c o o m m m m e e n n d d e e d d f f l l o o w w r r a a t t e e s s . .
56
Charging Ports
Expansion Valve
Moisture Indicator
Solenoid Valve
(Migration only)
Refrigerant "Shut Off" Valve
The minimum and maximum water flow rates are
given in the General Data section. Water flow rates
below the tabulated values will result in laminar flow
causing freeze-up problems, scaling, stratification and
poor system control. Flow rates exceeding the
maximum listed could result in very high pressure
drop, erosion of the heat exchanger and damage to the
water flow switch.

Water Temperature Limits

N N O O T T I I C C E E
H H e e a a t t E E x x c c h h a a n n g g e e r r a a n n d d C C o o m m p p r r e e s s s s o o r r
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 b b e e l l o o w w 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
h h e e a a t t e e x x c c h h a a n n g g e e r r a a n n d d c c o o m m p p r r e e s s s s o o r r d d a a m m a a g g e e f f r r o o m m
w w a a t t e e r r f f r r e e e e z z i i n n g g i i n n b b r r a a z z e e d d p p l l a a t t e e a a n n d d r r u u p p t t u u r r i i n n g g
s s e e p p a a r r a a t t i i o o n n b b e e t t w w e e e e n n r r e e f f r r i i g g e e r r a a n n t t a a n n d d w w a a t t e e r r f f l l o o w w
c c h h a a n n n n e e l l s s . .
L L e e a a v v i i n n g g w w a a t t e e r r t t e e m m p p e e r r a a t t u u r r e e s s b b e e l l o o w w 4 4 2 2 ° ° F F r r e e q q u u i i r r e e
g g l l y y c c o o l l p p r r o o t t e e c c t t i i o o n n d d o o w w n n t t o o 1 1 5 5 ° ° F F . .
N N O O T T I I C C E E
E E v v a a p p o o r r a a t t o o r r D D a a m m a a g g e e ! !
C C i i r r c c u u l l a a t t i i n n g g w w a a t t e e r r t t e e m m p p e e r r a a t t u u r r e e s s a a b b o o v v e e 1 1 2 2 5 5 ° ° F F w w h h e e n n
t t h h e e u u n n i i t t i i s s n n o o t t o o p p e e r r a a t t i i n n g g 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 v v a a p p o o r r a a t t o o r r
d d a a m m a a g g e e . .
Catalog chiller performance data is based on a water
temperature drop of 10°F . Full load chilled water
temperature drops from 8 to 14°F may be used as long
as minimum and maximum water temperature and
minimum and maximum flow rates are not violated.
Leaving water temperatures below 42°F require freeze
protection down to 15°F. The maximum water
temperature that can be circulated through the chiller
when the unit is not operating is 125°F. Evaporator
damage could result above this temperature.

Short Water Loops

N N O O T T I I C C E E
C C o o m m p p r r e e s s s s o o r r D D a a m m a a g g e e ! !
D D o o n n o o t t o o p p e e r r a a t t e e w w i i t t h h w w a a t t e e r r l l o o o o p p s s w w i i t t h h l l e e s s s s t t h h a a n n f f i i v v e e
m m i i n n u u t t e e s s c c i i r r c c u u l l a a t t i i o o n n t t i i m m e e a a s s i i t t 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 p p o o o o r r
s s u u p p e e r r h h e e a a t t c c o o n n t t r r o o l l a a n n d d c c o o m m p p r r e e s s s s o o r r d d a a m m a a g g e e . .
Adequate chilled water system water volume is an
important system design parameter because it
provides for stable chilled water temperature control
and helps limit unacceptable short cycling of chiller
compressors. Typically, a five-minute water loop
circulation time is sufficient to prevent short water loop
issues. Therefore, as a guideline, ensure the volume of
water in the chilled water loop equals or exceeds five
times the evaporator flow rate. For systems with a
rapidly changing load profile the amount of volume
should be increased.
SS-SVX11K-EN