Abbreviations and Definitions
Abbreviation Definition
NHB General name of NHB-055, NHB-080, NHB-110 and NHB-150
NG Natural Gas
LP Propane Gas
AP Air Pressure
APS Air Pressure Sensor
DHW Domestic Hot Water
FM Fan Motor
GPM Gallons Per Minute
MGV Main Gas Valve
RPM Revolutions Per Minute
PCB Printed Circuit Board
EMI Electromagnetic Interface
HTL High Temperature Limiter
LWCO Low Water Cut Off