4 Zone Expandable Switching Relay w/ Priority

Function
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.

Features

• 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