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Operation and Troubleshooting
Checkout Procedure
W W A A R R N N I I N N G G
H H a a z z a a r r d d o o u u s s S S e e r r v v i i c c e e P P r r o o c c e e d d u u r r e e s s ! !
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 a a l l l l p p r r e e c c a a u u t t i i o o n n s s i i n n t t h h i i s s m m a a n n u u a a l l a a n n d d
o o n n t t h h e e t t a a g g s s , , s s t t i i c c k k e e r r s s , , a a n n d d l l a a b b e e l l 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 e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .
T T e e c c h h n n i i c c i i a a n n s s , , i i n n o o r r d d e e r r t t o o p p r r o o t t e e c c t t t t h h e e m m s s e e l l v v e e s s f f r r o o m m
p p o o t t e e n n t t i i a a l l e e l l e e c c t t r r i i c c a a l l , , m m e e c c h h a a n n i i c c a a l l , , a a n n d d c c h h e e m m i i c c a a l l
h h a a z z a a r r d d s s , , M M U U S S T T f f o o l l l l o o w w p p r r e e c c a a u u t t i i o o n n s s i i n n t t h h i i s s m m a a n n u u a a l l
a a n n d d o o n n t t h h e e t t a a g g s s , , s s t t i i c c k k e e r r s s , , a a n n d d l l a a b b e e l l s s , , a a s s w w e e l l l l a a s s t t h h e e
f f o o l l l l o o w w i i n n g g i i n n s s t t r r u u c c t t i i o o n n s s : : U U n n l l e e s s s s s s p p e e c c i i f f i i e e d d o o t t h h e e r r w w i i s s e e , ,
d d i i s s c c o o n n n n e e c c t t a a l l l l e e l l e e c c t t r r i i c c a a l l p p o o w w e e r r i i n n c c l l u u d d i i n n g g r r e e m m o o t t e e
d d i i s s c c o o n n n n e e c c t t a a n n d d d d i i s s c c h h a a r r g g e e a a l l l l e e n n e e r r g g y y s s t t o o r r i i n n g g
d d e e v v i i c c e e s s s s u u c c h h a a s s c c a a p p a a c c i i t t o o r r s s b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g . .
F F o o l l l l o o w w p p r r o o p p e e r r l l o o c c k k o o u u t t / / t t a a g g o o u u t t p p r r o o c c e e d d u u r r e e s s t t o o
e e n n s s u u r r e e t t h h e e p p o o w w e e r r c c a a n n n n o o t t b b e e i i n n a a d d v v e e r r t t e e n n t t l l y y
e e n n e e r r g g i i z z e e d d . . W W h h e e n n n n e e c c e e s s s s a a r r y y t t o o w w o o r r k k w w i i t t h h l l i i v v e e
e e l l e e c c t t r r i i c c a a l l c c o o m m p p o o n n e e n n t t s s , , h h a a v v e e a a q q u u a a l l i i f f i i e e d d l l i i c c e e n n s s e e d d
e e l l e e c c t t r r i i c c i i a a n n o o r r o o t t h h e e r r i i n n d d i i v v i i d d u u a a l l w w h h o o h h a a s s b b e e e e n n
t t r r a a i i n n e e d d i i n n h h a a n n d d l l i i n n g g l l i i v v e e e e l l e e c c t t r r i i c c a a l l c c o o m m p p o o n n e e n n t t s s
p p e e r r f f o o r r m m t t h h e e s s e e t t a a s s k k s s . .
Table 2. Troubleshooting guide
Problem
Possible Cause
No 24 volt control voltage
No line voltage
No fan operation
Bad fan motor or controller
Heat pump jumper not
configured correctly
Improper fan operation
Control is not wired correctly
No need to modulate the fan
No input pressure to control
No fan modulation
Heat pump inputs wired
incorrectly into the controller
Miswired
Control is not wired correctly
Pressure transducer problem
Erratic fan operation
Dirty or blocked condenser
coil
The high pressure
Improper head pressure
switch trips off
setpoint setting
Reduced cooling
Evaporative Defrost Control
capacity at low Ambient
is active
ACC-SVN190B-EN
Before leaving the installation, observe for correct
operation through the desired pressure range (see
Table 3, p.
Possible Solution
Check for 24 Vac between Y1 or Y2 and C terminals - it should read 24 volts.
Check voltage across brown, orange, and yellow motor leads. If no voltage is
present verify all wiring is correct.
If fan does not start, motor is bad and should be replaced. If motor does start,
check controller settings. If motor still fails to start, replace controller.
Verify the heat pump jumper is configured correctly.
See wiring diagrams. Ensure that the 24 Vac power supply is connected.
If pressure is equal to or greater than the head pressure control setpoint, the fan
will be operating at full speed.
Check for proper transducer and Tee installation. Schrader valve depressor must
depress Schrader valve enough to allow refrigerant into pressure transducer.
Check diagram and verify heat pump inputs are properly wired into the controller.
Check that the 24 Vac signal and the transducer are wired up correctly into the
controller.
See wiring diagrams.
Check for proper transducer and Tee installation. Schrader valve depressor must
depress Schrader valve enough to allow refrigerant into pressure transducer.
Clean condenser coil.
See unit fails to start above.
Check the setpoint and reduce it if needed.
Disable EDC function in Symbio™ 700
18).
17
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