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N N O O T T I I C C E E
P P r r o o o o f f o o f f F F l l o o w w S S w w i i t t c c h h ! !
F F a a i i l l u u r r e e t t o o p p r r o o v v i i d d e e f f l l o o w w s s w w i i t t c c h h e e s s o o r r j j u u m m p p i i n n g g - - o o u u t t o o f f
s s w w i i t t c c h h e e 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 s s e e v v e e r r 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 . .
E E v v a a p p o o r r a a t t o o r r a a n n d d c c o o n n d d e e n n s s e e 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 r r e e q q u u i i r r e e
p p r r o o o o f f o o f f f f l l o o w w s s w w i i t t c c h h e e s s . .
• •
F F a a i i l l u u r r e e t t o o i i n n c c l l u u d d e e t t h h e e p p r r o o o o f f o o f f f f l l o o w w d d e e v v i i c c e e s s a a n n d d / /
o o r r j j u u m m p p i i n n g g o o u u t t t t h h e e s s e e d d e e v v i i c c e e s s c c o o u u l l d d c c a a u u s s e e t t h h e e u u n n i i t t
t t o o s s t t o o p p o o n n a a s s e e c c o o n n d d a a r r y y l l e e v v e e l l o o f f p p r r o o t t e e c c t t i i o o n n . .
• •
F F r r e e q q u u e e n n t t c c y y c c l l i i n n g g o o n n t t h h e e s s e e h h i i g g h h e e r r l l e e v v e e l l
d d i i a a g g n n o o s s t t i i c c d d e e v v i i c c e e s s c c o o u u l l d d c c a a 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 h h e e r r m m a a l l
a a n n d d p p r r e e s s s s u u r r e e c c y y c c l l i i n n g g o o f f u u n n i i t t c c o o m m p p o o n n e e n n t t s s ( ( O O - - r r i i n n g g s s , ,
g g a a s s k k e e t t s s , , s s e e n n s s o o r r s s , , m m o o t t o o r r s s , , c c o o n n t t r r o o l l s s , , e e t t c c . . ) ) a a n n d d / / o o r r
f f r r e e e e z z e e d d a a m m a a g g e e , , r r e e s s u u l l t t i i n n g g i i n n p p r r e e m m a a t t u u r r e e f f a a i i l l u u r r e e o o f f
t t h h e e c c h h i i l l l l e e r r . .
Refrigeration Controls
Controls on the refrigeration system are designed to
provide safety for the major components and for
proper operation of the system.
Sight Glass
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 r r e e m m o o v v e e m m o o i i s s t t u u r r e e f f r r o o m m s s y y s s t t e e m m c c o o u u l l d d
c c a a u u s s e e c c o o r r r r o o s s i i o o n n w w i i t t h h i i n n t t h h e e c c h h i i l l l l e e r r / / h h e e a a t t e e r r
c c o o m m p p o o n n e e n n t t s s , , a a n n d d d d e e g g r r a a d d e e p p e e r r f f o o r r m m a a n n c c e e . .
P P e e r r f f o o r r m m v v a a c c u u u u m m e e v v a a c c u u a a t t i i o o n n o o f f s s y y s s t t e e m m t t o o r r e e m m o o v v e e
m m o o i i s s t t u u r r e e . .
Phase Monitor
ARTC-SVX005B-EN
When the sight glass shows a green indicator, no moisture is present. When the sight glass
shows a yellow indicator, there is moisture in the refrigerant line. Bubbles can be observed
whenever chiller/heater cycling causes the pressure to change up or down.
A compressor can fail if operated in reverse for more than a minute. A phase monitor is used
on three phase power systems to ensure that the electricity supplying the chiller/heater is
configured appropriately. A phase monitor prevents a motor from operating in reverse—if
any of the three legs of power are landed incorrectly—and will shut the system down upon
detection of a reversed phase condition.
C C h h i i l l l l e e r r / / H H e e a a t t e e r r D D e e s s c c r r i i p p t t i i o o n n
Pressure transducers convert pressure into an
electronic signal that the microprocessor displays in
pounds per square inch (psi). Transducers vary in
pressure ranges that depend on the type of refrigerant
used. Pressure transducers are calibrated using the
touchscreen interface panel.
Temperature sensors transmit temperature data
electronically to the microprocessor for display in
either Fahrenheit (°F) or Celsius (°C). Temperature
sensors are calibrated using the touchscreen interface
panel.
Low Pressure Bypass
Logic that uses a time delay that temporarily bypasses
the low-pressure switch for compressor start up. Once
the delay times out the normal controls are put back on
line within the control circuit.
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