Power to the Controller | Controller Field Wiring |
•Observe (follow proper) polarity.
•Observe proper wire colors while making electrical connections.
•Provide an external surge suppressor capable of maintaining system integrity.
•Provide overload protection and a disconnect means for equipment serviceability as required by local and state code.
•Conduit cannot be used as the ground. (There must be a “WIRED” ground.)
•Very Important: A grounding electrode con- ductor shall be used to connect the equipment grounding conductors, the equipment enclosures, and where the system is grounded, the grounded service conductor to the grounding electrode.
For Single-Stage (ON/OFF) Boilers
All stage connections on the control board are con- nected at the {TH} (Thermostat) location on the boiler wiring diagram.
For Multiple-Stage Boilers
First stage connections on the control board are con- nected at the {TH} (Thermostat) location on the boiler wiring diagram. Second (or third, etc.) stage connec- tions on the control board are connected at the locations shown on the boiler wiring diagram.
Fig. 2: Wiring Diagram
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