Installation / Operation Instruction Manual

BLP SERIES Install, Operation, and Maintenance Manual
SECTION 3: OPERATION AND CONTROLS
Rev-1 Bradford White • 200 Lafayette St. • Middleville, MI 49333 Page 22 of 83
BrutePlate Manual Phone: [phone] • Website: www.BradfordWhite.com 02/26/2020
FIGURE 3-2: Double-Wall and Single-Wall Heat Exchanger Leakage Comparison
NOTE: Optional heat exchanger insulation is available.
3.4 Safety Controls
Automatic over-temperature limit function is included, which will cut off electricity supply to the
fail-close control valve during over temperature condition. Power supply is restored to the
control valve when the unit goes back to normal operating temperature conditions.
The unit includes alarm functionality in the safety controls. A red light turns on when the hot
water temperature reaches the alarm setting, and then alarm starts sounding. In the next
step, the power supply to the control valve is interrupted, causing it to close. Hot water outlet
piping includes pressure and temperature relief valve to release high temperature hot water
to safe drain in order to protect the unit. When the unit goes back to normal operating
temperature conditions, a green light turns on, but the siren continues until the owner manually
presses the alarm silence button to turn it off. Power to the control valve is restored, and the
unit goes back into normal operation.
SINGLE
WALL
DOMESTIC
WATER
AIR GAP
AIR GAP
LEAK IN
PLATE VENTS
TO EXTERIOR
AIR GAP
DOUBLE WALL
BOILER
WATER
LEAK IN PLATE CONTAMINATES
DOMESTIC WATER
Double Wall Heat Exchanger Cross Section
GASKET
GASKET
GASKET
GASKET
GASKET
GASKET
DOMESTIC
WATER
BOILER
WATER
DOMESTIC
WATER
DOMESTIC
WATER
Single Wall Heat Exchanger Cross Section