The ZSR Series is multi-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 3, 4, 5 or 6 heating circulator pumps, depending on model selected, a primary pump, and has LED indicators to provide functional status and easy system troubleshooting. In addition, a primary pump system circulator is switched on whenever any zone calls for heat. Power supply: 120 VAC, 50/60 Hz Transformer voltage: 24 VAC Maximum transformer load: 40 VA (ZSR101/103/104/106). Electrical switch rating: 10A (ZSR101), 20A (ZSR103/4) max combined Electrical switch rating pump output: 120 VAC, 5A each Dry contact rating: AUX, XX, ZONE1 E/S: 120 VAC max, 2A each Replaceable fuses: Type 2AG, 5A slow blow
