37
PDV Series
37
Frozen Exhaust Vent Terminal(s)
If an intake or exhaust vent terminal is blocked with ice or snow due to severe conditions, the pressure
switch and control will not allow the burner to operate. This will result in a three flash status code. Once the blockage is
removed (through melting or other means) the controls will let the burner operate. The position of the vent terminals in
relation to each other and terminals from other appliances can have an effect on the potential for blockage due to ice or
snow. See the installation instructions for recommended positioning of the terminals.
Testing under severe conditions has shown that the optional concentric vent terminal is resistant to ice
blockage. Contact Bradford White or the supplier of the water heater for information about ordering the optional
concentric vent terminal.
Bradford White has also developed an air intake relief device that can be installed in the air intake near the water
heater temporarily enabling the water heater to operate with a frozen intake terminal. Contact Bradford White or the
supplier of the water heater for information about the air intake relief device.
Glossary of Terms
BTU
British Thermal Units
GPM
Gallons per minute
Hz Hertz
KWh
kilowatt hour
LED
Light Emitting Diode
NPT
National Pipe Thread
Ohms
Ohms of resistance
PSI
Pounds per square inch
RPM
Revolutions per minute
ECO
Energy Cut Out
VAC
Volts Alternating Current
“ W.C.
Inches of Water Column
ºC
Degrees Centigrade
ºF
Degrees Fahrenheit
