Name: 4 Zone Expandable Switching Relay w/ Priority (ZSR104)
SKU: 5335
Price: 259.91 USD
Availability: instock

4 Zone Expandable Switching Relay w/ Priority (ZSR104)

SKU: 5335

Brand: Caleffi

$259.91

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.

5 in stock

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
ETL certified to CSA and UL standards