Model 375/475MS Series ® a company ® Integral Relief Valve Monitor Switch (2 1/2" thru 10")  Installation  Maintenance Instructions 120VAC DISCONNECT 120VAC DISCONNECT STEP DOWN TRANSFORMER TO NEXT MS STEP DOWN TRANSFORMER TO NEXT MS 120 VAC TO 24 VAC (TYPICAL) (IF APPLICABLE) 120 VAC TO 24 VAC (TYPICAL) (IF APPLICABLE) CONTACT RELAY CONTACT RELAY OR TIMED RELAY OR TIMED RELAY (MS ) (MS ) (MS ) 1 2 3 (MS ) (MS ) (MS ) 1 2 3 120 VAC ALARM, BEACON, SOLENOID VALVE, PUMP, ETC. MULTI PURPOSE CIRCUIT NOTIFICATION CIRCUIT W/TIMED RELAY FEATURES APPLICATION • Supplied with normally open contacts The Integral Relief Valve Monitor Switch, when connected to a • Weather resistant housing & wiring leads low voltage alarm circuit, electrically supervises the relief valve in • Switch contact rating: 0.4A @ 24VAC the closed position. In the event of a backflow condition, the relief • Switch is factory installed and ready for immediate valve closes an electrical contact thereby completing an electri- installation to appropriate electric circuit cal circuit to signal that a possible relief valve discharge may be occurring. A timed relay can be used with a 10 second delay to prevent water hammer or inlet pressure fluctuations from causing an alarm. In addition to being used for notification, the Integral Relief Valve Monitor Switch can be use for the following: • Pump actuation. Electric • Solenoid valve actuation for closure of inlet or Solenoid Timer outlet piping • System equipment shutdown • Initiation of system equipment when installed in point-of-use applications (see spec sheet EST for more information) 12" MIN. 30" MAX. Model 375MS with ZW206 Solenoid Control Valve and EST Electronic Solenoid Timer SWITCH In all applications, the Integral Relief Valve Monitor Switch should only be used in low voltage circuits. Be certain to consult local and national electrical codes regarding fusing, grounding and proper electrical etiquette. WARRANTY: WILKINS Valves are guaranteed against defects of material or workmanship when used for the services recommended. If in any recommended service, a defect develops due to material or workmanship, and the device is returned, freight prepaid, to WILKINS within 12 months from date of purchase, it will be repaired or replaced free of charge. WILKINS’ liability shall be limited to our agreement to repair or replace the valve only. Proposition 65 Warning This product contains chemicals known to the State of California to cause cancer or birth defects or other reproductive harm. WILKINS, a ZURN company 1747 Commerce Way, Paso Robles, CA 93446 Phone:805-238-7100 Fax:805-238-5766 IS375MS (REV. 6/12)