Walchem WDT400 Series, Instruction Manual, Page: 12 / 37

System A System B
Chart Chart
Recorder Recorder
BLEED FEED BOI 1 BIO 2 ALARM
L2 L2 L2 L2 L2 L2
N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O.
CO
ND
T+
T­
RE
D
BL
K
+5
V
FL
O
W
SW
1
FL
O
W
SW 2
FL
O
W
M
T
R
1
FL
O
W
M
T
R
2
IN
+
IN
­
IN
+
IN
­
IN
+
IN
+
IN
­
CO
N
D
T+
T­
RE
D
BL
K
+5
V
L1 L2/N
GROUND
STUD
GRN 120V
GRN 120V
GRN/YEL 240V
GRN/YEL 240V
BLEED B
BLEED A FEED A FEED B ALARM
L2/N L2/N L2/N L2/N L2/N L2/N
N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O.
WH
T
120V
B
L
U 240V
W
H
T
120V
BLU
24
0V
W
H
T
120V
BLU
24
0V
W
H
T
120V
BLU
240V
BL
K
1
2
0
V
B
R
N
240V
BLK 120V BR
N 240V
IF
M
O
T
O
RI
ZED
BA
L
L
V
AL
VE
BL
K
1
2
0
V
B
R
N
240V
BL
K
1
2
0
V
B
R
N
240V
WHT 120V
BLU 240V
BLK 120V BRN
24
0V
IF MOTORIZED
BALL VALVE
GRN 120V
GRN/YEL 240V
TO GROUND
STUD GRN 120V
GRN/YEL 240V
TO GROUND
STUD
GRN 120V
GRN/YEL 240V
TO GROUND
STUD
Bleed Solenoid/
Motorized Ball Valve
NOTE: When connecting a
motorized ball valve, the pre-wired
pigtail must be removed and the
valve requires two wires, one to
N.O. to open the valve and one to
N.C. to close the valve.
Bleed
Solenoid/
Motorized
Ball Valve
Alarm
Pump Pump
Figure 4 Outputs
9