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Industrial Equipment, MRO

HVAC

HVAC Article

HVAC (pronounced either "H-V-A-C" or, occasionally, "aitch-vak") is an initialism/acronym that stands for "heating, ventilation, and air conditioning". HVAC is sometimes referred to as "climate control" and is particularly important in the design of medium to large industrial and office buildings such as sky scrapers and in marine environments such as aquariums, where humidity and temperature must all be closely regulated whilst maintaining safe and healthy conditions within. In certain regions (e.g., UK) the term "Building Services" is also used, but may also include plumbing and electrical systems. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilation is dropped as HACR (such as the designation of HACR-rated circuit breakers).

Heating, ventilation, and air conditioning is based on the basic principles of thermodynamics, fluid mechanics, and heat transfer, and to inventions and discoveries made by Michael Faraday, Willis Carrier, Reuben Trane, James Joule, William Rankine, Sadi Carnot, and many others. The invention of the components of HVAC systems goes hand-in-hand with the industrial revolution, and new methods of modernization, higher efficiency, and system control are constantly introduced by companies and inventors all over the world.

The three functions of heating, ventilation, and air-conditioning are closely interrelated. All seek to provide thermal comfort, acceptable indoor air quality, and reasonable installation, operation, and maintenance costs. HVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between spaces. How air is delivered to, and removed from spaces is known as room air distribution.

HVAC Items

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Lennox Roof Top Unit
$100.00
HONEYWELL Y86 INTERMITTENT PILOT KIT,NG,NEW
$74.95
Cecomp digital gauges
$9.90
Aluminum Squirrel Cage Blower Fan Wheel, 4 1/4" OD
$6.50
Carrier Bryant Payne Furnace Circuit Board LH33WP003A
$69.99
Broan - Nutone 690 Bath Fan Upgrade Repair Kit 60cfm
$40.99
Honeywell transformer 24 vac, 75 va 120/208/240V, 60HZ
$3.00
Parker BF163S Bi-Direct Liquid Line Filter Dryer New
$0.99
Loren Cook Centrifugal Inline Cabinet Fan GN 120 NEW
$13.50
NEW C-052 SPORLAN CATCH-ALL FILTER DRIER 1/4 MALE FLARE
$5.99
WR 50A65-289 CIRCUIT BOARD
$10.50
Large Stainless Steel Plate Heat Exchanger Alfa Laval
$125.00
Lennox Roof Top Unit
$100.00
(2) Omega Heating Element AHC-65335 for 65253 NEW
$59.00
lennox ignition control kit 62H80 new hvac furnace
$36.85
cook roof top fan
$140.00
Dayton Natural Gas Garage/Shop Unit Heater
$51.00
HITACHI VORTEX BLOWER
$299.00
Sporlan - Discharge Bypass Valve
$9.99
Fan Motor, Fasco D133 1/20 HP 115 Volt, 1500 RPM CCW
$12.50
HONEYWELL S8600M SPARK IGNITION MODULE CIrCUIT BOARD
$69.99
ASCO REDHAT 8210G037 Solenoid valve NEW IN BOX
$31.00
ASCO REDHAT 8210G037 Solenoid valve NEW IN BOX
$31.00
TWO=CARRIER CORPORATION reversing valve NIB
$30.00
Yellow Jacket Refrigeration Service Guages
$21.50
Linebacker Delay on Break Timer EAC501ADJX NIP
$9.50
Wago 870 Terminal Block ... 6 contact (3) with cap
$1.00
ITT General Control MR-2G312G Thermopilot Valve NEW!!
$21.50
ASCO RED HAT 2-WAY GENERAL PURPOSE VALVE 120VAC/60 Hz
$119.00
Stainless Steel Brazed Plate Heat Exchanger 8-1/4x3x1-
$19.95
Fan Motors, Set of 3, GE Unit Bearing
$9.99
CORE COMPONENTS MUC-024-100-1TF-CB TRANSFORMER NEW NR
$2.25
Used TRANE Voyager rooftop package unit 10 ton
$250.00
New A.O. Smith 1/3 hp ac motor 1725/1140 rpm 115v Ph 1
$9.98
lennox roof top unit
$100.00
Weiss 4 1/2" Dial Thermometer 45BB-060 40-0-60 F+C 48"
$9.99
JOHNSON CONTROL / METASYS / POWER SUPPLY
$250.00
New Flexible Aluminum Ducting 4"x8' L23
$5.99
Honeywell M4182A1004 Modutrol IV Motor 120V USED
$0.99
Copeland compressor
$100.00
BELIMO AF24 ELECTRIC ROTARY ACTUATOR, NIB
$29.99
Used TRANE Voyager rooftop package unit 7.5 ton
$200.00
JE - Solenoid Coil
$9.99
DUCTMATE DRI161218 18" ROUND DUCT ACCESS DOOR 16"X12"
$19.19
Pressure Gauge and Schrader Valve 15 PSI, 1/2" NPT NEW!
$9.99
honeywell aquastat L4006A 2007
$75.00
4 Honeywell T631A1022 Farm-O-Stat Airswitch Controllers
$12.50
TWO=CARRIER CORPORATION DEFROST TIMER NIB
$30.00
Sodrtek FX-50 Static Safe Fume Exhauster
$7.99
Honeywell V4943 B Diaphragm Gas Valve Nat Gas
$0.99
4 NEW MARSH PSI Gauges (0-30 PSI)
$0.99
CO Detector
$81.00
Tif Instruments 9010A Slimline Charging Meter
$0.99
Imperial 275-FS 275FS 45Degree Flaring Swaging Tool NEW
$99.00
colman actuator drive nib
$40.00
LITTLE GIANT Condensate Removal Pump VCL-24ULS 115V NOS
$21.50
PARAGON, DEFROST TIMER
$50.50
Copeland compressor
$113.49
Motor Phase Protector and brownout protector Totaline
$9.99
New Leeson Lecentric Gear Reducer
$90.00
A1 Component Linebacker Motor Protector EAC400 NIP
$19.95
ASCO RED HAT 2-WAY GAS CUT-OFF VALVE 120VAC/60 Hz
$119.00
NEW Robinair 4 CFM 1/3HP Two Stage Vacuum Pump 15434
$355.49
Testo 523 AC Refrigeration Analyzer & 0554 0547 Printer
$405.00
refrigeration part
$2.25
HERMETIC COMPRESSOR ANALYZER HA-1
$50.00
refrigeration part
$0.99
honeywell keyboard display module s7800 1001 new !
$181.50
ASCO RED HAT 2-WAY GAS CUT-OFF VALVE 120VAC/60 Hz
$149.00
Lot 4 Complete Sets Industrial 56" Ceiling Fan 5 Speed
$160.00
FASCO BLOWER MOTOR
$9.99
hvac lot honeywell american standard control board
$8.00
TIF 9010A Electronic Refrigerant Scale - No Reserve!
$75.50
Relay steveco 2 pole double throw 208-240Vcoil 12 Amp
$0.99
CORE COMPONENTS MUC-024-100-1TF-CB TRANSFORMER NEW NR
$4.25
2 HONEYWELL 3/4" Motorized Zone Valves V8043A 1029 NOS
$43.03
TWO=CARRIER CORPORATION reversing valve NIB
$30.00
Sporlan R-502 expansion valves set of 3
$9.99
Air Cleaner,HEPA,3 Speed,17 3/4 Dia
$39.00
NEW Robinair 1.2 CFM 1/8HP Two Stage Vacuum Pump 15234
$361.49
United 524 Anti-Overflow Condensate Cartridges
$19.95
2 INCH CRANE BRASS THREADED GATE VALVE (LARGE)--NEW
$12.99
Heater,Portable,Lp Gas
$29.01
Honeywell M81 85D 1006 Modutrol IV Motor New
$22.50
Parker 163S Liquid Line Filter Dryer New
$0.99
Copeland Scroll Compressor SF18K4E-TFD-261 3-phase 460V
$129.99
Skinner Skinner Solenoid Valve LC2LB4150`
$39.99
ASCO AH13 HYDRAMOTOR ACTUATOR 120VAC/60 Hz
$219.00
DANFOSS VLT6000 VF DRIVE
$259.95
JOHNSON CONTROL/METASYS CONTROLLER
$999.00
Honeywell Skinner Valve V52DB2100
$24.99
ASCO REDHAT 8210G037 Solenoid valve NEW IN BOX
$36.00
Qualitek Q 623 Air-Pressure Leak Detector
$2900.00
honeywell smart gas valve sv9501
$49.99
Rollin Kool Portable A/C Unit Stainless Steel 14000 BTU
$255.00
New Magnetek HVAC 3/4 HP Condenser Fan Motor
$25.00
Alnor Velometer Jr. Velocity meter with carrying case
$99.00
Insert Holders,(2) Kendex Tooling R-327-2
$19.99
Honeywell HZ432 4 zone 3Heat 2Cool Control Panel Zoning
$289.99