ACC-SVN190B-EN
17
Operation and Troubleshooting
Checkout Procedure
W
WA
AR
RN
NIIN
NG
G
H
Ha
azza
arrd
do
ou
uss S
Se
errv
viicce
e P
Prro
occe
ed
du
urre
ess!!
F
Fa
aiillu
urre
e tto
o ffo
ollllo
ow
w a
allll p
prre
ecca
au
uttiio
on
nss iin
n tth
hiiss m
ma
an
nu
ua
all a
an
nd
d
o
on
n tth
he
e tta
ag
gss,, ssttiicckke
errss,, a
an
nd
d lla
ab
be
ellss cco
ou
ulld
d rre
essu
ulltt iin
n
d
de
ea
atth
h o
orr sse
erriio
ou
uss iin
njju
urry
y..
T
Te
ecch
hn
niicciia
an
nss,, iin
n o
orrd
de
err tto
o p
prro
otte
ecctt tth
he
em
msse
ellv
ve
ess ffrro
om
m
p
po
otte
en
nttiia
all e
elle
eccttrriicca
all,, m
me
ecch
ha
an
niicca
all,, a
an
nd
d cch
he
em
miicca
all
h
ha
azza
arrd
dss,, M
MU
US
ST
T ffo
ollllo
ow
w p
prre
ecca
au
uttiio
on
nss iin
n tth
hiiss m
ma
an
nu
ua
all
a
an
nd
d o
on
n tth
he
e tta
ag
gss,, ssttiicckke
errss,, a
an
nd
d lla
ab
be
ellss,, a
ass w
we
ellll a
ass tth
he
e
ffo
ollllo
ow
wiin
ng
g iin
nssttrru
uccttiio
on
nss:: U
Un
nlle
essss ssp
pe
ecciiffiie
ed
d o
otth
he
errw
wiisse
e,,
d
diisscco
on
nn
ne
ecctt a
allll e
elle
eccttrriicca
all p
po
ow
we
err iin
nccllu
ud
diin
ng
g rre
em
mo
otte
e
d
diisscco
on
nn
ne
ecctt a
an
nd
d d
diisscch
ha
arrg
ge
e a
allll e
en
ne
errg
gy
y sstto
orriin
ng
g
d
de
ev
viicce
ess ssu
ucch
h a
ass cca
ap
pa
acciitto
orrss b
be
effo
orre
e sse
errv
viicciin
ng
g..
F
Fo
ollllo
ow
w p
prro
op
pe
err llo
occkko
ou
utt//tta
ag
go
ou
utt p
prro
occe
ed
du
urre
ess tto
o
e
en
nssu
urre
e tth
he
e p
po
ow
we
err cca
an
n n
no
ott b
be
e iin
na
ad
dv
ve
errtte
en
nttlly
y
e
en
ne
errg
giizze
ed
d.. W
Wh
he
en
n n
ne
ecce
essssa
arry
y tto
o w
wo
orrkk w
wiitth
h lliiv
ve
e
e
elle
eccttrriicca
all cco
om
mp
po
on
ne
en
nttss,, h
ha
av
ve
e a
a q
qu
ua
alliiffiie
ed
d lliicce
en
nsse
ed
d
e
elle
eccttrriicciia
an
n o
orr o
otth
he
err iin
nd
diiv
viid
du
ua
all w
wh
ho
o h
ha
ass b
be
ee
en
n
ttrra
aiin
ne
ed
d iin
n h
ha
an
nd
dlliin
ng
g lliiv
ve
e e
elle
eccttrriicca
all cco
om
mp
po
on
ne
en
nttss
p
pe
errffo
orrm
m tth
he
esse
e tta
asskkss..
Before leaving the installation, observe for correct
operation through the desired pressure range (see
).
Table 2. Troubleshooting guide
Problem
Possible Cause
Possible Solution
No fan operation
No 24 volt control voltage
Check for 24 Vac between Y1 or Y2 and C terminals - it should read 24 volts.
No line voltage
Check voltage across brown, orange, and yellow motor leads. If no voltage is
present verify all wiring is correct.
Bad fan motor or controller
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.
Improper fan operation
Heat pump jumper not
configured correctly
Verify the heat pump jumper is configured correctly.
Control is not wired correctly
See wiring diagrams. Ensure that the 24 Vac power supply is connected.
No fan modulation
No need to modulate the fan
If pressure is equal to or greater than the head pressure control setpoint, the fan
will be operating at full speed.
No input pressure to control
Check for proper transducer and Tee installation. Schrader valve depressor must
depress Schrader valve enough to allow refrigerant into pressure transducer.
Heat pump inputs wired
incorrectly into the controller
Check diagram and verify heat pump inputs are properly wired into the controller.
Miswired
Check that the 24 Vac signal and the transducer are wired up correctly into the
controller.
Erratic fan operation
Control is not wired correctly
See wiring diagrams.
Pressure transducer problem
Check for proper transducer and Tee installation. Schrader valve depressor must
depress Schrader valve enough to allow refrigerant into pressure transducer.
Dirty or blocked condenser
coil
Clean condenser coil.
The high pressure
switch trips off
Improper head pressure
setpoint setting
See unit fails to start above.
Check the setpoint and reduce it if needed.
Reduced cooling
capacity at low Ambient
Evaporative Defrost Control
is active
Disable EDC function in Symbio
™
700
