Valve Open - Honeywell MAXON 8730 Series Instruction Manual

AUXILIARY SIGNAL SWITCHES 4700(NI) & 33479 SERIES
All Maxon valves may be equipped with internally-
mounted signal switch(es) to provide a "proof-of-open" or
"proof-of-closure" valve position indication.
Auxiliary signal switches indicate when valve is open or
closed and are normally connected electrically into your
control panel lights or warning device circuit(s).
VCS (Valve Closed Switch) is actuated when valve is fully
shut. It is the upper, inverted snap-switch mounted on rear
of switch bracket. VCS-1 is an SPDT (single-pole, double-
VOS
(VOS-2 shown)
VOS wands
VOS actuator
VCS actuator
E - i - 05/22

Valve Open

throw) switch. VCS-2 is a DPDT (double-pole, double-
throw) switch. All contacts are available for external
circuitry.
VOS (Valve Open Switch) is actuated when valve reaches
full-open. It is the lower snap-switch mounted on front of
switch bracket. VOS-1 is an SPDT switch. On automatic
reset valves, its normally closed contact serves as a motor
limit switch and is not available for external circuitry VOS-
2 is DPDT, used in lieu of VOS-1 for additional contacts.
5
Valve Shut
VOS actuator
VCS
(VCS-2 shown)
VCS wand
VCS actuator
32M-95002-03