Caleffi Z-one™ ZSR104 Pump Control Relay, 120 V, 20 A

Multi-zone pump and boiler operating control for multiple zone hydronic heating systems. Interfaces with low voltage thermostats or any other low voltage controllers having a switching action. Controls from 3 to 6 heating circulator pumps (model dependent). Primary pump with LED indicators to provide functional status and easy system troubleshooting. Primary pump system circulator is switched on whenever any zone calls for heat.

Caleffi Z-one™ Pump Control Relay, Series: ZSR Series, 120 V, 20 A, 12 VA, 50/60 Hz, 2A at 120 VAC Contact Rating, Screw Terminal, LED Display, 110 deg F, 11 in Overall Length, 3 in Overall Width, 9-1/4 in Overall Height, For Use With: 2, 3 and 4-Wire Thermostats and Other Low Voltage Controllers

• Heavy-duty, sealed relays
• One primary pump output and 3 to 6 (model dependent) zone pump outputs (120 V/5 A each)
• Zone priority selectable with 1 hr time out feature
• Convenient R,W,C and T,T,COM dual labeling at thermostat terminals
• System pump status (on/off) during priority selectable
• Dry contacts (XX,AUX, zone 1 E/S) capable of switching line voltage
• Automatic resettable fuse on 24 V circuit
• Three-pump ground terminals for simplified wiring
• Expandable to unlimited number of zones using simple three-wire connection between controls
• Large screw terminals for ease of wiring
• Front panel LED indicator light for functional status

• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/Caleffi_ZSR106_Instruction_Installation_Manual.pdf
• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/Caleffi_ZSR104_Specification_Sheet.pdf
• Video Link https://youtu.be/WZ93oRqpczc?list=PLuuV0ELkYb5W5cfKQPw9x9GsD4SFjv5e_