Service Manual

37
Glossary of Terms
UPV75 Series
37
Frozen Exhaust Vent Terminal
If the 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.
Glossary of Terms
BTU British Thermal Units
GPM Gallons per Minute
Hz Hertz
kWhr 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