Caleffi ZSR104 Z-one Relay for HVAC Systems - 4 Zone Control for Home Heating & Cooling | Perfect for Multi-Zone Temperature Regulation in Residential and Commercial Buildings

Caleffi ZSR104 - Z-one Relay (four zone)Multi-Zone Pump ControlThe ZSR104is a multi-zone pump and boiler operating control for multiple zone hydronic heating or cooling systems. The ZSR104interfaces with low voltage thermostats, or any other low voltage controllers having a switching action. The ZSR104controls up to 4heating circulator pumps, a primary pump and has LED indicators to provide functional status and easy system troubleshooting.Features: Compatible with low voltage 2, 3, or 4 wire thermostats R, W, C and T T COM dual labeling at thermostat terminals Z-oneLink unlimited zone expansion 120 VAC pump outputs Remote Enable input 24 - 120 VAC Selectable Priority with 1 hour time-out Selectable Post Purge and Exercise Dry contacts for ZONE 1 (DHW), capable of switching line voltage High capacity transformer Large terminal connections Simplified wiring with extra ground terminals Heavy duty sealed relays All pumps fuse protected (with spare fuse) Front LED Lights 100% Factory tested with 3 year warranty, ETL ApprovedSpecification:Power supply: 120 VAC, 50/60 HzTransformer voltage: 24 VACMaximum transformer load: 12 VAElectrical switch rating pump output: 120 VAC, 5A each (20A max combined)Dry contact rating, Zone 1 ES, XX, AUX: 120 VAC max, 2A eachReplaceable fuses: Type 2AG, 5A slow blowWorking temperature range: 32F (0C)115F (45C)Maximum humidity: 90% non-condensingApprovals: Conforms to UL873 / Certified to CSA C22 No 24, listed by ETL