Optional Field Connection; Connections To A Building Automation Sys; Ladder And Wiring Diagrams - Bradford White Brute BNTH Installation And Operation Instructions Manual

Page 32
premature component failure.
Connections for External Control -
Connect the 4-20mA signal from an external control
or building automation system to terminal block
7 (TB7) in the control panel. The connections are
labeled Remote Analog Input. When making the
connections, follow the polarity designations shown
on the label.
Terminal block 8 (TB8) in the control panel can be
used for connecting optional components, such
as low water cutoffs, flow switches, additional high
limits and other field-supplied devices that must be
interlocked with the boiler. These are non-powered
dry contacts only. All safeties or end switches must
be wired in series by removing the supplied jumpers.
7.6 Connections to a
Building Automation System
Brute boilers can be controlled and monitored
through the included Modbus ports. The Modbus
wiring should be completed according to the
diagrams shown below. If alternate communication
protocols are desired, Bradford White offers
"gateways" to allow BACnet, LON, and other
communications protocols. For additional information
on setting up Modbus and other communication
protocols, contact the factory.
Signals from a Building Automation System can be
connected to the MB2 Modbus connections on the
controller. See Fig. 41. (MB1 is used to connect to
the Operator Interface (UI).
If multiple boilers are connecting in a cascading
Lead/ Lag arrangement, the signals from the Building
Automation System must be brought in through a
System Display.
See Fig. 42.
7.7 Ladder and Wire Diagrams
See Figure 30 and Figure 31
Figure 30. Ladder Diagram
B W
RADFORD HITE