Installation / Operation Instruction Manual

Page 46
B RADFORD W HITE
Figure 33. Power & Control Panel Layout
NOTE: All water heating units are shipped from the factory with a resistor (jumper) between
the outdoor sensor terminals (terminals 1 and 2 on TB7). If this resistor is removed,
the water heater will not be able to heat water above 140°F.
Factory
installed
100Ω resistor
on water
heaters
7.B.2 Variable Speed Pump Control
Variable speed pump control is optional equipment on all
commerical Brute boilers. Pump speed is controlled to
maintain a user-chosen temperature rise between the inlet
and outlet of the unit.
The variable speed pump control will operate the boiler
pump at maximum ow during boiler startup to ensure
stable operation is reached before introducing variable
water ow. This key feature keeps the boiler’s combustion
and variable speed pump’s ow in phase with each other,
protecting the heat exchanger from potential low ow
conditions.
Contact your manufacturers representative for more
details.