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c. Determine which switch action is required for the
flow switch.
• "Flow" means that the switch will close circuit
C.-N.O. and open circuit C.-N.C. when flow rate
is increased above setpoint of flow switch.
• "No Flow" means that the switch will open circuit
C.-N.O. and close circuit C.-N.C. when flow rate
is decreased below setpoint of flow switch.
d. Based upon the mode of operation ("Flow" or "No-
Flow") required, complete the appropriate steps to
connect wires to flow switch. Use a Phillip's head
screwdriver to loosen and tighten switch terminal
screws when attaching wires.
For "Flow" Mode of Operation (Fig. 1)
If the flow switch will be used to actuate a signal,
alarm or other device when flow occurs, connect
the wire from that device to the "N.O." contact.
Connect the "Hot" power supply wire to "C" terminal.
For "No Flow" Mode of Operation (Fig. 2)
If the flow switch will be used to actuate a signal,
alarm or other device when no flow occurs, connect
the wire from that device to the "N.C." contact.
Connect the "Hot" power supply wire to "C" terminal.
NOTE: Repeat above to connect wires to second
switch on "D" model flow switches.
6
(
Common
LINE
FS4-3
3
1
2
HOT
LOAD
Fig. 1
Flow
Opens
Flow
Common
Circuit
Closes
1
3
Circuit
2
(
(
(
Normally
(
(
Normally
closed
open
LINE
FS4-3
3
1
2
HOT
LOAD
Fig. 2
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