Belimo ECON-ZIP-BASE - Fault Detection and Diagnostics (FDD); Fault Detection and Diagnostics (FDD) Table

38
0
6/16 - Subject to change. © Belimo Aircontrols
(
USA
)
, Inc
.
ZIP
Eco
n
o
m
i
z
er
Fault Detection and Diagnostics
(
FDD
)
Tabl
e
Fault Detection Problem
Diagnostic Action
(in addition to alarm stored / transmitted)
Potential Cause
CA Fault
Code
O
AT sensor
out of range
Sensor is returning a
value that
i
s out o
f
the
predetermined ran
g
e
• Economizing functionalit
y
disable
d
•
O
A damper returns to minimum position
• Com
p
ressor low tem
p
lockout disabled
• Therm
i
stor
f
a
i
lure
• Damage to wire affecting resistance outpu
t
A
, B
OAT sensor
not
d
etecte
d
S
ensor previousl
y
installed is not detected
or sensor
h
as not
b
een
in
s
t
a
ll
ed
• Economizing functionalit
y
disable
d
• OA dam
p
er returns to minimum
p
osition
•
C
ompressor low temp lockout disabled
• Sensor never installe
d
• Installed sensor has o
p
en or short
• Wire harness broken
A
, B
O
AH sensor
out o
f
range
Sensor is returnin
g
a
value that is out of the
predetermined range -
Sin
g
le Enthalpy
• Economizing functionalit
y
disable
d
• OA dam
p
er returns to minimum
p
osition
• Suppl
y
voltage too hig
h
•
S
ensor electronics failur
e
•
S
ensor element failure
• Sensor used is not correct range
A,
B
S
ensor is returning a
value that is out of the
predeterm
i
ned ran
g
e -
Differential Enthalpy
• Economizing functioning b
y
differential
temperature w
i
th return a
i
r hum
i
d
i
t
y
l
i
m
it
A
OAH sensor
not detected
S
ensor previousl
y
in
s
t
a
ll
ed
i
s
n
o
t
de
t
ec
t
ed
or sensor has not been
i
nstalled -
Sin
g
le Enthalpy
• Econom
i
z
i
ng
f
unct
i
onal
i
t
y
d
i
sable
d
•
O
A damper returns to minimum position
• Sensor inadvertentl
y
installed, not delete
d
• Suppl
y
power missing
• Sensor electronics o
p
e
n
• Wir
e
h
a
rn
ess
b
r
o
k
e
n
A
, B
Sensor previousl
y
installed is not detected
or sensor has not been
i
nstalled -
Di
ff
erential Enthalpy
• Econom
i
z
i
ng
f
unct
i
on
i
ng b
y
d
iff
erent
i
al
temperature with return air humidit
y
limi
t
A
RAT sensor
out of range
Sensor is returnin
g
a
value that
i
s out o
f
the
predeterm
i
ned range -
Differential Temperature
• Economizing functioning b
y
OAT single dr
y
bulb
• Change over limit modified to suit single dr
y
bulb
• Thermistor failure
• Damage to wire affecting resistance outpu
t
A
Sensor is returnin
g
a
value that
i
s out o
f
the
predetermined ran
g
e -
Di
ff
erential Enthalpy
• Economizing functioning b
y
OAE single enthalp
y
• Chan
g
e over limit modified to 28btu/lb 75°
F
A
RAT
se
n
so
r
n
o
t
de
t
ec
t
ed
Sensor is returnin
g
a
value that
i
s out o
f
the
predeterm
i
ned ran
g
e -
Di
ff
erential Temperature
• Economizing functioning b
y
O
AT single dr
y
bulb
• Change over limit modified to suit single dr
y
b
u
lb
• Installed sensor has open or short
• W
i
r
e
h
a
rn
ess
b
r
o
k
e
n
A
Sensor is returnin
g
a
v
a
l
ue
th
a
t
is
ou
t
of
th
e
predeterm
i
ned ran
g
e -
Differential Enthal
py
• Economizin
g
functionin
g
b
y
OAE sin
g
le enthalp
y
•
C
han
g
e over limit modified to 28btu
/
lb 75°
F
A
RAH
se
n
so
r
out o
f
ran
g
e
S
ensor is returnin
g
a
v
a
l
ue
th
a
t
is
ou
t
of
th
e
predeterm
i
ned ran
g
e
• Economizing functioning b
y
OAE single enthalp
y
• Chan
g
e over limit modified to 28btu/lb 75°
F
•
S
uppl
y
power too hig
h
•
Se
n
so
r
e
l
ec
tr
o
ni
cs
f
a
il
u
r
e
•
Se
n
so
r
e
l
e
m
e
nt f
a
il
u
r
e
A
RAH
sensor
not
d
etecte
d
S
ensor previousl
y
i
nstalled
i
s not detected
• Economizing functioning b
y
O
AE single enthalp
y
•
C
hange over limit modified to 28btu
/
lb 75°
F
• Suppl
y
power missin
g
•
S
ensor electronics ope
n
• W
i
re harness broken
A