Watts Benchmark Aerco OMM-0122 - Page 8

Benchmark 750-3000 Boiler Installation & Startup Manual
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OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 8 of 122
AERCO Technical Terminology Meanings
TERMINOLOGY MEANING
PTP Point-to-Point (usually over RS232 networks)
P&T
Pressure and Temperature
ProtoNode
Hardware interface between BAS and a boiler or water heater
PVC
Poly Vinyl Chloride, a common synthetic plastic
PWM
Pulse Width Modulation
REF (Ref) Reference
RES. Resistive
RS232
(or EIA-232)
A standard for serial, full-duplex (FDX) transmission of data based on
the RS232 Standard
RS422
(or EIA-422)
A standard for serial, full-duplex (FDX) transmission of data based on
the RS422 Standard
RS485
(or EIA-485)
A standard for serial, half-
duplex (HDX) transmission of data based
on the RS485 Standard
RTN (Rtn)
Return
SETPT (Setpt)
Setpoint Temperature
SHLD (Shld)
Shield
SPDT Single Pole Double Throw, a type of switch
SSOV Safety Shut Off Valve
TEMP (Temp) Temperature
Terminating Resistor
A resistor placed at each end of a daisy-chain or multi-drop network
in order to prevent reflections
that may cause invalid data in the
communication
Tip-N-Tell A device that indicates if a package was tipped during shipping
UL A business that tests and validates products
VAC Volts, Alternating Current
VDC Volts, Direct Current
VFD Vacuum Fluorescent Display, also Variable Frequency Drive
W Watt
W.C. Water Column, a unit of pressure (1 W.C. = 249 Pa)
µA Micro amp (1 million
th
of an ampere)