Navien NCB500-2S/37K Service Manual page 7

Abbreviations and Definitions
Abbreviation
NCB500
NG
LP
AP
APS
DHW
FM
GARC
LPM
MGV
RPM
PCB
EMI
HTL
LWCO
6 Abbreviations and Definitions
Definition
General name for NCB500-2S/37K, NCB500-2S+/41K products
Natural Gas
Propane Gas
Air Pressure
Air Pressure Sensor
Domestic Hot Water
Fan Motor
Gas Air Ratio Control
Litre Per Minute
Main Gas Valve
Revolutions per Minute
Printed Circuit Board
Electromagnetic Interference
High Temperature Limiter
Low Water Cut Off