Bradford-White Corp Modulating Boiler, BNTH, BNTV SECTION Electrical Connections, Main Power

Page 32 BRADFORD WHITE CORP.

SECTION 7.

Electrical Connections

WARNING

The appliance must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the latest edition of the National Electrical Code, ANSI/NFPA 70, in the U.S. and with latest edition of CSA C22.1 Canadian Electrical Code, Part 1, in Canada. Do not rely on the gas or water piping to ground the metal parts of the boiler. Plastic pipe or dielectric unions may isolate the boiler electrically. Service and maintenance personnel, who work on or around the boiler, may be standing on wet floors and could be electrocuted by an ungrounded boiler. Electrocution can result in severe injury or death.

Single pole switches, including those of safety controls and protective devices must not be wired in a grounded line.

All electrical connections are made on the terminal blocks that are located inside the control panel.

NOTE: All internal electrical components have been prewired. No attempt should be made to connect electrical wires to any other location except the terminal blocks.

Wiring connections are shown in Figures 29 and 30.

Important Note: DO NOT MAKE/BREAK BRUTE ELITE LINE VOLTAGE TO SIGNAL CALL FOR HEAT. A “call for heat / end call for heat” MUST be connected to the field interlock terminals. Some Brute Elite components are designed to have constant voltage during normal operation. If the Brute Elite's supply voltage is toggled as a call for heat signal, premature failure of these components may result.

Brute Elite does not recognize 4mA as a signal to shut off. If the call for heat is not connected between the field interlock terminals, Brute Elite will remain in low fire when it sees 4mA as a modulating signal.

Caution

Brute Elite supply voltage must not be disengaged, except for service or isolation, or unless otherwise instructed by procedures outlined in this manual. To signal a call for heat, use the 24V field-interlock, as shown in the wiring diagram(s).

7.1 Main Power

Connect a 15A fused, 120-volt supply to the main power switch (hot leg is connected directly to switch). Neutral leg is connected directly to the white wire.

Ground wire can be connected to the grounding lug in the control panel (see Table 11).

Figure 27. Control Panel Layout.