5 Zone Valve Re... 
Caleffi 3 Zone Expandable Switching Relay w/ Priority (ZSR103)
$204.26
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.
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- 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
| Weight | 2 lbs |
|---|---|
| Attachments | Specifications ZSR |
| Brand |
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