3-way installed on the supply
in diverting configuration
3-way installed on the return
3-way valve with normally closed actuator
(Note: 3-way uses only normally closed actuator)
Operation of Normally Closed Valve
2-way
3-way
N.C. without power
Port “A” closed
Port “A” closed
Port “B” opened
Port “AB” opened
N.C. opened with power
Port “A” opened
Port “A” opened
Port “B” closed
Port “AB” opened
N.C. manually opened
Port “A” opened
Port “A” opened
Port “B” opened
Port “AB” opened
Manual Open (NC act only)
Wiring Diagram
(NC)
A
B
(NO)
AB
The manual opening is
achieved by moving the
manual opening lever to
the locked position. When
power is applied, the
manual
lever
unlocks
automatically.
