I/O
The connections for the inputs and outputs are shown below. Avoid using
excessively large wire (larger than 18 AWG) on the inputs and outputs since it may
prevent the enclosure door from closing properly. All wires from the inputs and
outputs must pass through the grommet in the cord seal. Any unused openings in
the grommet must be sealed with plugs to maintain the watertight characteristics of
the enclosure.
Outputs
All outputs (with the exception of the external alarm) are 24 VAC, one amp maximum.
Any device connected to an output should be rated for less than one amp at 24 VAC.
An overload on any output will cause current to be interrupted to the output and an
alarm condition will occur. If the transformer supplying the controller becomes
overloaded, the controller will reboot. If the overload still exists after the controller
reboots, the controller will shut down the system and log an overload alarm.
The discrete outputs on the AL250-V2 are 24VAC only. The output loads (e.g.,
solenoid valves) cannot be bussed to the incoming power supply neutral (See
figure on page 2-4). Two wires for each output must be connected to the load
device from the AL250-V2.
Inlet Solenoid:
A 24 VAC output is provided to power the inlet solenoid valve. The valve
must function on 24 VAC and have a current load less than one ampere or
otherwise be powered by an interposing relay.
AutoFlush Valve
: A 24 VAC output is provided to power a
reject (Autoflush) solenoid
valve. This output will energize during the flush cycle thus opening the valve
and allowing flow to bypass the reject control valve. The valve must function
on 24 VAC and have a current load less than one ampere or otherwise be
powered by an interposing relay.
Chemical Injection Pump
: A 24 VAC output is provided to control a chemical
injection system. This output is intended to power an interposing relay or
some other low current device interfaced with the pump.
Motor Starter:
A 24 VAC output is included to provide controlled pump operation. This
output powers the coil of the magnetic starter relay if rated at one ampere or
less. Other loads will require an interposing relay.
Permeate Diversion Valve
: This is also a 24 VAC output. When the percent rejection
of the system is below the setpoint, this output will be energized. This output
is also energized during a flush. This output will power a relay, which will
control an electric actuator. The maximum current available is one ampere.
01 02 03
04 05 06
07 08
09 10
11 12 13 14 15 16 17 18 19 20 21 22
29
30
31
32
35 36 37
P
er
m
C
on
d
(W
hi
te
)
P
er
m
C
on
d
(S
hi
el
d)
P
er
m
C
on
d
(B
la
ck
)
Fe
ed
C
on
d
(W
hi
te
)
Fe
ed
C
on
d
(S
hi
el
d)
Fe
ed
C
on
d
(B
la
ck
)
Fe
ed
T
em
p
(R
ed
)
Fe
ed
T
em
p
(G
re
en
)
P
er
m
T
em
p
(R
ed
)
P
er
m
T
em
p
(G
re
en
)
12
V
D
C
(+
)
A
la
rm
H
or
n
12
V
D
C
P
er
m
ea
te
D
iv
er
si
on
V
al
ve
M
ot
or
S
ta
rte
r
C
he
m
P
um
p
A
ut
o
Fl
us
h
Va
lv
e
In
le
t V
al
ve
24
V
A
C
24
V
A
C
24
V
A
C
24
V
A
C
24
V
A
C
Lo
w
P
re
ss
ur
e
S
w
itc
h
In
pu
t
H
ig
h
P
re
ss
ur
e
S
w
itc
h
In
pu
t
M
id
T
an
k
Le
ve
l S
w
itc
h
In
pu
t
H
ig
h
Ta
nk
L
ev
el
S
w
itc
h
In
pu
t
P
re
tre
at
m
en
t I
nt
er
lo
ck
In
pu
t
24
V
A
C
C
he
m
P
um
p
Fa
ilu
re
In
pu
t
G
ro
un
d
24
V
A
C
24
V
A
C
23
24
25
26
27
28
P1 P2 P3 P4 P5 P6 P7 P8
Fe
ed
P
re
ss
ur
e
(+
)
In
te
rs
ta
ge
P
re
ss
ur
e
(+
)
R
ej
ec
t P
re
ss
ur
e
(+
)
P
er
m
ea
te
P
re
ss
ur
e
(+
)
Fe
ed
P
re
ss
ur
e
(-
)
In
te
rs
ta
ge
P
re
ss
ur
e
(-
)
R
ej
ec
t P
re
ss
ur
e
(-
)
P
er
m
ea
te
P
re
ss
ur
e
(-
)
F1 F2 F3 F4 F5 F6 F7 F8 F9
Fe
ed
F
lo
w
(+
)
Fe
ed
F
lo
w
(-
)
Fe
ed
F
lo
w
S
hi
el
d
P
er
m
/R
ej
ec
t F
lo
w
(+
)
P
er
m
/R
ej
ec
t (
-)
P
er
m
/R
ej
ec
t F
lo
w
S
hi
el
d
R
ec
yc
le
F
lo
w
(+
)
R
ec
yc
le
F
lo
w
(-
)
R
ec
yc
le
F
lo
w
S
hi
el
d
R1
R2
33
34
A
la
rm
R
el
ay
A
la
rm
R
el
ay
24 VAC Common
A
ux
ili
ar
y
O
ut
pu
t
A1
A2
NOTE: Terminal numbers are not in order intentionally. This allows terminal connections to match previous versions of the controller.
!
2-3
!
