In. Hg – Inches of mercury vacuum
In. WC – Inches of Water Column
JB – Junction Box
KO – Knock Out
KW – Kilowatts
LL – Low Limit
LP – Low Pressure or Liquified Petroleum
LPS – Low Pressure Steam
LRA – Locked Rotor Amps
LWCO – Low Water Cut Off
MA – Mixed Air
MAT – Mixed Air Temperature
MAU – Make-up Air Unit
MCC – Motor Control Center
MFD – Micro-Farad
MP – Motor Protector
MPT – Male Pipe Thread
NC – Normally Closed
NEC – National Electric Code
NFPA – National Fire Protection Association
NO – Normally Open
NPT – National Pipe Thread
NTC – Negative Temperature Coefficient
OA – Outside Air
OAT – Outside Air Temperature
OP – Oil Pressure
ODP – Ozone Depletion Potential
PCB – Printed Circuit Board
PE – Pneumatic to Electric
PID – Proportional, Integral, & Derivative
PRV – Pressure Reducing Valve
PSC – Permanent Split Capacitor
PSIA – Pounds per Square Inch Absolute
PSIG – Pounds per Square Inch Gauge
PT – Pressure Temperature
PTAC – Portable Terminal Air Conditioner
PTC – Positive Temperature Coefficient
PWM – Pulse Width Modulation
RA – Return Air or Reverse Acting
RAT – Return Air Temperature
RF – Return Fan
RH – Relative Humidity
RPBP – Reduced Pressure Backflow Preventer (sometimes also seen as RPZ)
RPM – Revolutions Per Minute
RTU – Roof Top Unit
RV – Reversing Valve
SA – Supply Air
SAT – Supply Air Temperature
SD – Smoke Damper
SEER – Seasonal Energy Efficiency Ratio
SF – Service Factor or Supply Fan
SH – Super Heat
SP – Static Pressure or Set Point
SPDT – Single Pole Double Throw
SPST – Single Pole Single Throw
SV – Solenoid Valve
TD – Temperature Difference or Time Delay
TDS – Total Dissolved Solids
TEV – Thermostatic Expansion Valve (sometimes also seen as TXV)
Ton – Ton of refrigeration effect
UH – Unit Heater
UV – Ultra-Violet or Unit Ventilator
VAV – Variable Air Volume
VFD – Variable Frequency Drive
VSD – Variable Speed Drive
VVT – Variable Volume/Temperature
W – Watt
WB – Wet Bulb
WC – Water Column
XFMR – Transformer

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