Watts Aerco INN 1060N - Page 10

Innovation - Edge [i] Installation, Operation, Maintenance Manual
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AERCO Technical Terminology Meanings
TERMINOLOGY
MEANING
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
SETPT (Setpt)
Setpoint Temperature
SHLD (Shld)
Shield
SPDT
Single Pole Double Throw, a type of switch
SSD
Client to Client programming
SSOV
Safety Shut Off Valve
SV
Sequencing Valve (Used with Water Heater Management (WHM)
system)
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
WHM
Water Heater Management
W.C.
Water Column, a unit of pressure (1-inch W.C. = 249 Pa)
µA
Micro amp (1 million
th
of an ampere)