Bradford White Brute BNTH Installation And Operation Instructions Manual page 61

Brute
BOILERS AND VOLUME WATER HEATERS
Appliance Control
The Brute unit has an integrated control that
incorporates manual reset high limit control, operating
temperature control, modulating control, ignition control,
outdoor reset control, pump control and many other
features. If any of these features are thought to be
defective, please consult the factory for proper trouble
shooting practices prior to replacing the control. If
control replacement is required, turn off all power to
the appliance and shut off all manual gas valves to the
appliance. Remove the front door to the appliance and
the plastic bezel and the control panel. Remove all wire
connections from the control board. The control board
connections are keyed to only allow connection in the
proper location, but proper handling techniques should
be used to avoid damage to the wiring or connectors.
To remove the control, push in on the two tabs on the
left side of the board to unlatch the clips from the control
panel. Rotate the control around the fastening points on
the right side of the control to remove the hooks from
the control panel. To replace the control, repeat the
steps listed above in the reverse orders making sure
to connect all wires in the proper locations. Place the
appliance in operation following the steps outlined in
Section 9.
Figure 47 - Burner Service
Ignitor Assembly
The ignitor assembly is a two rod system that consists
of a ground rod and a spark rod (See Figure 47). To
remove the ignitor assembly, shut off the 120 Volt power
supply to the appliance. Turn off all manual gas valves
connecting the appliance to the main gas supply line.
Remove the front door of the boiler to gain access to
the ignitor assembly. Remove the two wires connected
to the assembly. Then remove the two bolts connecting
the ignitor assembly to the burner door. If the old ignitor
assembly is determined to be defective, install a new
ignitor assembly (check that the spark gap is 3/16").
Replace the gasket if necessary.
Flame Sensor
The flame sensor is a single rod system. To replace
the flame sensor electrode, shut off the 120 Volt power
supply to the boiler. Turn off all manual gas valves
connecting the boiler to the main gas supply line.
Remove the front door of the boiler to gain access to
the flame sensor electrode. Remove the flame sensor
Page 57
Ignitor Assembly
3/16"