White-Rodgers 1361-103 1" Sweat, 2-Way, Normally Closed Zone Valve

White-Rodgers 1361-103 Zone Valve Normally Closed with Auxiliary Switch.
These water valves provide a low cost system of zoned temperature control wherever hot water is the heating medium.
FEATURES
• Quiet operation.
• Valve stem made of stainless steel.
• Automatic recycling manual operator shows valve position at all times.
• Built-in auxiliary contacts to control burner or circulator relay.
• Motor can be removed from valve assembly without draining system.
The contact arrangement of the switch is constructed so that when the shaft of the motor revolves 90° a new set of stationary and moving contacts makes, while the old set breaks. As the thermostat calls for heat, the valve motor is energized by a circuit made through side “A" of the motor switch to terminal “4". (At the same time, a circuit is made through the warp switch heater.) As the valve begins to open, side “A" of the motor switch makes with a “holding" contact and then breaks from the stationary contact wired to terminal “4". The “holding" contact provides a circuit which prevents the valve from stopping part way through its cycle if the thermostat is changed to the satisfied position. As the valve reaches the full open position, side “B" of the motor switch closes, providing a low voltage auxiliary circuit for starting the burner or circulator. At the same time side “A" of
the motor switch makes a circuit through the warp switch contacts to terminal “2". The valve does not continue to rotate since the warp switch opened its contacts before the valve reached the full open position. The warp switch heater remains energized as long as the thermostat calls for heat. When the thermostat is satisfied, the circuit through the warp switch heater is broken, allowing the heater to cool. When the warp switch contacts close, the valve motor is energized, and drives the valve to the closed position. As the valve begins to move to the closed position, side “A" of the motor switch makes the holding circuit. Then side “B" of the motor switch breaks the auxiliary circuit and side “A" of the motor switch makes contact “4" then breaks the holding circuit stopping the valve (in a fully closed position).