Schwank ThermoControl Plus 4 - Manual (Page 33)

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8 WIRING DIAGRAMS - ThermoControl Plus 1, 2, 4
8.1 Standard Tube Heaters:
 Single-stage zone; 1-8 Zones
 Two-stage zones; 1-4 Zones (refer to section 5 and 5.2)
 Wire each of the low- and high-stage zones as below
 Jumper position and controller programming determine two-stage operation