24
Rev 2.1
Check the Power Source
Warning: Using a multi–meter, check the following voltages at the circuit breaker panel prior to connecting any
equipment. Make sure proper polarity is followed and house ground is proved. (See below)
AC = 108 VAC Minimum, 132 VAC Max; AB = 108 VAC Minimum, 132 VAC Max; BC = <1 VAC Max
Figure 2.7. Circuit Breaker Diagram
Making the Electrical Connections
Verify that the circuit breaker is properly sized by referring to the boiler rating plate. A dedicated circuit breaker should be
provided.
Note: Current draw on rating plate does not include pump current.
Turn off all power to the boiler. Verify that power has been turned off by testing with a multi meter prior to working with any
electrical connections or components.
Observe proper wire colors while making electrical connections. Many electronic controls are polarity sensitive.
Components damaged by improper electrical installation are not covered by warranty.
Provide overload protection and a disconnect means for equipment serviceability as required by local and state code.
Install boiler controls, thermostats, or building management systems in accordance with the applicable manufacturers’
instructions.
Conduit should not be used as the earth ground.
Note: A grounding electrode conductor shall be used to connect the equipment grounding conductors, the equipment
enclosures, and the grounded service conductor to the grounding electrode.
Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Danger: Shock Hazard: Make sure electrical power to boiler is disconnected to avoid potential serious injury or damage
to components.
Figure 2.8. Atlas Field Wiring Box
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