SEE "ELECTRIC-PNEUMATIC SWITCH"

STANDS FOR EXHAUST AIR, AND/OR THE UNIT OF MEASURE: "EACH"

A SPECIFIC TERMINAL USED TO ENSURE BY MEANS OF SPECIAL CONNECTION, THE GROUNDING OF PART OF A DEVICE/CONTROL

THE RANGE OF TEMPERATURES WITHIN WHICH AN AIR HANDLER IS IN ECONOMIZER MODE.

THE RANGE OF TEMPERATURES BETWEEN THE HIGH END END OF AN ECONOMIZER BAND AND THE FIRST STAGE OF MECHANICAL COOLING.

A CONTROL MODE IN WHICH RELIEF DAMPERS AND OUTSIDE RETURN AIR DAMPERS ARE CONTROLLED BY AIR TEMPERATURE IN ORDER TO PROVIDE THE MOST ECONOMICAL HEATING AND/OR COOLING

AN AIR FLOW SWITCH, ELECTRICALLY OPERATED WITH NORMALLY-OPENED & NORMALLY-CLOSED INPUTS WHICH LEAD TO A COMMON OUTPUT

SEE "EMF"

GENERALLY USE LOW VOLTAGES AND CURRENTS SUCH AS 20 VOLTS OR EVEN LESS.

SEE "ELECTRONIC CONTROLS"

STANDS FOR ELECTROMOTIVE FORCE, WHICH IS A RISE IN ELECTRICAL ENERGY

STANDS FOR ELECTROMAGNETIC INTERFERENCE

AN ELECTRO-MECHANICAL DEVICE THAT TRANSLATES MECHANICAL MOTION OR POSITION INTO ELECTRICAL SIGNALS.

A TERM DEVELOPED IN THE 1970'S WHICH PROVIDES SEVERAL TECHNIQUES FOR REDUCING ENERGY CONSUMPTION THROUGHOUT A BUILDING(s) WHILE AT THE SAME TIME MAXIMIZING OPERATING EFFICIENCY.

TERMS AND ABBREVIATIONS THAT REPRESENT "MEASURED UNITS"; SOME EXAMPLES INCLUDE: (VAC) VOLTS ALTERNATING CURRENT; (KW) KILOWATTS; (GPM) GALLONS PER MINUTE; (F) FAHRENHEIT; ECT., ECT.

MEASURE OF  TOTAL HEAT OF AIR (SENSIBLE + LATENT) THAT IS MEASURED ABOVE AN ARBITRARY DATUM. THE SPECIFIC ENTHALPY OF DRY AIR IS ASSIGNED A VALUE OF ZERO  DEG. (F) AND U.S.  ATMOSPHERIC PRESSURE (29.92" OF MERCURY), IS MEASURED IN BTU PER LB. OF DRY AIR

SEE "ELECTRIC-PNEUMATIC SWITCH"

MAINLY FOUND ON OR ASSOCIATED WITH ELECTRONIC CIRCUITRY/CIRCUIT BOARDS, STANDS FOR "ERASABLE PROGRAMMABLE READ-ONLY MEMORY"

OCCURS WHENEVER A MIXTURE OF ALLOYS OR METALS REACHES ITS LOWEST POSSIBLE MELTING POINT.

THE ADIABATIC EXCHANGE OF HEAT BETWEEN AIR AND WATER SPRAY OR WETTED SURFACE. THE WET BULB TEMPERATURE OF THE AIR REMAINS CONSTANT, BUT THE DRY BULB IS DECREASED

A DIRECT DIGITAL CONTROL (DDC) SYSTEM DEVELOPED BY HONEYWELL THAT PROVIDES COMPLETE HVAC-BUILDING AUTOMATION

THIS TYPE OF SPECIFIC DAMPER NORMALLY OPENS AS THE OUTDOOR AIR DAMPER OPENS AND THE RETURN AIR DAMPER CLOSES. EXHAUST DAMPERS ARE USUALLY FOUND ON OR AS PART OF AIR HANDLING UNITS, AND CAN ALSO BE REFERRED TO AS "RELIEF DAMPERS"

SEE "FM APPROVED"

THE MOST COMMONLY USED TEMPERATURE SCALE WHICH IS MEASURED IN DEGREES AT 32 DEGREES AT ICE POINT AND 212 DEGREES AT THE BOILING POINT OF WATER.

THE TIME INTERVAL BETWEEN THE POINTS AT WHICH THE INSTANTANEOUS VALUE FALLS FROM 90% TO 10% OF THE SPECIFIED UPPER LIMIT.

THE PROCESS SIGNAL THAT IS USED IN CONTROL AS A MEASURE OF RESPONSE TO CONTROL ACTION; THE PART OF A CLOSED-LOOP SYSTEM WHICH AUTOMATICALLY BRINGS BACK DATA ABOUT THE CONDITION THAT IS UNDER CONTROL

SEE "FPM"

SEE "PNEUMATIC FINISH POINT"

THE TEMPERATURE AT WHICH A FLAMMABLE LIQUID CAN GIVE OFF ENOUGH  VAPOR TO IGNITE OR CAUSE EXPLOSION

WHEN A TWO-POSITION CONTROLLED DEVICE CAN STOP AT ANY POINT IN ITS STROKE AT LOSS OF CONTROL SIGNAL. THE CONTROLLED DEVICE  WILL HOLD THIS POSITION UNTIL THE CONTROLLER SENSES ANOTHER SIGNAL TO REPOSITION THE CONTROLLED DEVICE.

SEE "FLOATING CONTROL"

SEE "Cv"

VARIATION IN CYCLE WIDTH FROM CYCLE TO ADJACENT CYCLE.

STANDS FOR "FACTORY MUTUAL RESEARCH CORP." WHICH SETS SAFETY STANDARDS

STANDS FOR "FEET PER MINUTE", WHICH QUANTIFIES THE VELOCITY OF AIR FLOW

STANDS FOR FEET PER MINUTE

STANDS FOR "FEET PER SECOND"

AN ELECTRONIC DEVICE WHICH DIRECTLY CONVERTS A FREQUENCY INPUT TO A VOLTAGE OUTPUT.

STANDS FOR FULL SCALE