4 Zone Expandable Switching Relay w/ Priority

Sale price$207.00


The ZSR series is a zone pump and boiler operating control for multiple zone hydronic heating systems. The ZSR series interfaces with low voltage thermostats, or any other low voltage controllers having a switching action. The ZSR series controls up to 6 zone pumps (depending on model selected) and a primary pump. It has LED indicators to provide functional status and easy system troubleshooting.

  • Compatible with 2, 3 and 4-wire thermostats or other low voltage controllers with switching action
  • 120 VAC input
  • Heavy duty, sealed, fuse protected relay (with spare fuse)
  • 1 primary pump output and 3 to 6 (model dependent) zone pump outputs (120 VAC/5 A each)
  • Zone priority selectable with 1-hour time-out feature
  • Convenient R,W,C and T,T,COM dual labeling at thermostat terminals
  • DHW (ZR/ZC) dry contacts rated for switching line voltage
  • High capacity 12 VA or 20 VA transformer (model dependent)
  • Automatic resettable fuse on 24 V circuit
  • Selectable post purge
  • Selectable pump exercising
  • 3 pump ground terminals for simplified wiring
  • Expandable to unlimited number of zones using simple 3-wire connection between controls
  • Large screw terminals for ease of wiring
  • Front panel LED indicator light for functional status
  • 100% factory tested with 3 year warranty
  • ETL certified to CSA and UL standards

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