OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 6 of 124
CENTURION Installation, Operation & Maintenance Manual
0 FOREWORD
Technical Terminology Meanings
A (Amp)
Ampere
ADDR
Address
AGND
Analog Ground
ALRM
Alarm
ANSI
American National Standards Institute
ASME
American Society of Mechanical Engineers
AUX
Auxiliary
BAS
Building Automation System, often used interchangeably with EMS
Baud Rate
Symbol rate, or the number of distinct symbol changes (signaling events) transmitted
per second. It is not equal to bits per second, unless each symbol is 1 bit long.
BLDG (Bldg)
Building
BTU
British Thermal Unit; heat required to raise 1 pound (0.45 kg) of water 1°F (0.55 °C)
BTU/HR
BTUs per Hour (1 BTU/hr. = 0.29 W)
CCS
Combination Control System
CFH
Cubic Feet per Hour (1 CFH = 0.028 m
3
/hr.)
CO
Carbon Monoxide
COMM
Communication
Cal.
Calibration
CNTL
Control
CPU
Central Processing Unit
DBB
Double Block and Bleed, a gas trains containing 2 Safety Shutoff Valves (SSOVs) and a
solenoid operated vent valve.
DHW
Domestic Hot Water
DIP
Dual In-Line Package, a type of switch
ECU
Electronic Control Unit (O
2
sensor)
Edge Controller
A control system currently used in all Centurion Water Heaters.
EMS
Energy Management System; often used interchangeably with BAS
FM
Factory Mutual. Used to define Water Heater gas trains.
GF-xxxx
Gas Fired (a document numbering system)
GND
Ground
HDR
Header
Hex
Hexadecimal Number (0
–
9, A
–
F)
HP
Horsepower
HX
Heat Exchanger
Hz
Hertz (Cycles Per Second)
I.D.
Inside Diameter
IGN
Ignition
IGST Board
Ignition/Stepper Board contained in Edge Controller
INTLK (INTL’K)
Interlock
I/O
Input/Output
I/O Box
Input/Output (I/O) Box currently used on Centurion Water Heaters
IP
Internet Protocol
ISO
International Organization for Standardization
Lbs.
Pounds (1 lb. = 0.45 kg)
LED
Light Emitting Diode
LN
Low Nitrogen Oxide
MA (mA)
Milliampere (0.001)