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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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Kestrel 4100 HVAC Pocket Air Flow Tracker Monitor NEW
$239.00
Honeywell PRO3000 TH311OD1008 NIB Non-Programmable!!!
$40.00
Reznor Indoor Duct Furnace, Natural or Propane Gas
$549.00
Manifold Gauge 5'High Pressure Hose R407 R134A R404 R22
$15.50
HEIL COMMERCIAL HVAC A\C UNIT WITH GAS NEVER INSTALLED
$101.00
Mobile Air Circulator, Heavy Duty Direct Drive, Propell
$199.00
Mini Tube Tubing Cutter Plumbing HVAC Tool 1/8-5/8" OD
$7.95
HARDCAST ROTO-TACK INSULATION ADHESIVE 4 ROLL COATING
$400.00
HVAC Superheat Core Removal Tool
$31.00
Yellow Jacket Full Range Supe rEvac LCD Vacuum Gauge
$199.95
Honeywell MS7510a2008 2-10Vdc Damper Actuator
$0.99
Barber-Coleman TKR-1001 Pneumatic Thermostat
$29.00
Type K Thermocouple Temperature Sensor HVAC Fit Amprobe
$2.95
~Broan NuTone 690 Bathroom Fan Upgrade Kit~NIB~
$14.99
COPELAND SCROLL COMPRESSOR ZR18K4PFV830 EMERSON NIB
$299.99
Refrigeration Gages Imperial R-404A
$40.00
TRERICE PSI Gauge 0-160 PSI 6 New Gauges 4 1/2" Dial
$10.00
Screw-in Compressor Oil/Fluorescent Dye Injector HVAC/R
$47.00
EXHAUST FAN Commercial - Direct Drive - 20" - 1/4 Hp
$363.00
CAM-STAT HVAC PILOT REIGNITER UNIT W/ IGNITER
$12.99
HVAC Air Conditioning * Heating Ventilation 19 books CD
$0.89
PTAC New 1 1/4 Ton heat pump w/ 3000watt backup heat
$400.00
New 12" Round Kruege Steel Louvered Diffusers Model1400
$44.66
Thermostat guard
$8.99
COPELAND SCROLL COMPRESSOR CR38K6PFV870 EMERSON NIB
$299.99
Thermo Anemometer Vane Wind Speed Air Flow Meter NEW !!
$109.95
Refrigerant 12 Oil Charge 2oz. Mineral Oil & 2 oz. R12
$6.95
LOT OF 2 NIDEC / COMAIR CPU FANS 170 x 170mm 24VDC
$0.99
Johnson Controls Metasys® LN-PRG12B-0 LONWORKS®
$95.00
20' of low and high pressure air conditioning line set
$40.00
Universal Electric Pancake Motor 110VAC HVAC 1/20HP
$3.00
Halogen Refrigerant Leak Detector HVAC/R Tool R22 R134A
$90.00
SERCON 5000 FREON RECOVERY SYSTEM R-12 R-22 L@@K NICE
$9.99
EXHAUST FAN Commercial - Direct Drive - 24" - 1/2 Hp
$422.00
Air conditioner service system flush canister w/2 adptr
$21.99
CARRIER HVAC IGNITER CONTROL UNIT PART LH33CZ009
$16.99
Replace Sensor Halogen Refrigerant Freon Leak Detector
$24.99
HyCal HCT-829-A-MH Housing for Humidity Transmitter
$24.99
HVAC Tool, Maintenance or Repair Work Order Software PC
$59.00
Honeywell Q539A 1014 subbase for T87F thermostat
$5.00
GE 2 POLE 30 AMP CONTACTOR $40 VALUE
$10.00
19 Book CD * HVAC Air Conditioning | HEATING Manuals CD
$0.99
IMPERIAL Deluxe 4-Valve HVAC Service Manifold (620-C)
$61.00
Large 2 oz Compressor Oil/Dye Screw-in Injector AC/HVAC
$57.75
FURNACE FAN BLOWER ASSEMBLIES
$55.00
IST-AIM Commander Multi Gas Personal Monitor 5 Detector
$999.99
SCROLL COPELAND DANFOSS COMPRESSOR HCM081T4LC2 NIB
$199.99
TIFXL-1 automatic halogen leak detector with case
$46.00
2-Stage Rotary Heavy Duty Vacuum Pump 10CFM Industrial
$300.00
CPS CC-100 Compute-A-Charge Electronic Charging Scale
$66.25
Johnson Pneumatic Valve Actuator Exposed V-3000-8011
$14.99
McDonnell & Miller Flow Switch 1" Opening New
$24.51
2 Stage Rotary Vane Deep Vacuum Pump 29.92"Hg 2CFM HVAC
$119.95
1 case 10 filters purolator med. efficiency panel
$9.99
Totaline P374-2800 Programmable 7 days MultiStage
$14.50
Air Brush/Flush/Clean Tool Kit Canister Hose Gun HVAC/R
$49.75
APC AirFlow 5 ton Data Center AC Water Cooled Upflow
$595.00
Mastercool HVAC DIGITAL MANIFOLD New for 08 MAS99772
$413.95
Halogen Freon Refrigerant Leak Detector Air Pump HVAC/R
$99.00
New KI&BNT HVAC Halogen Freon Refrigerant Leak Detector
$62.99
MASTER COOL MMB10 EVAPORATIVE COOLER 2000 CFM BRAND NEW
$319.00
Ritchie Yellow Jacket 41343 HVAC Auto 134a, 404, 507
$51.04
Old Working Ceiling Steam Heater Webster Nesbilt
$99.99
Smart Controls SMART I/O™ EC230 LONWORKS® FTT-10A
$80.00
4 - Cornell-Dubilier 4 MFD 660 VAC Motor Run Capacitor
$0.99
WHOLE HOUSE FAN - 36" - 1/3 Hp - 115V - 7,800 CFM
$477.00
New Dayton 1/15 HP Shaded Pole Blower Motor 1000 RPM !!
$9.99
2-PACKS BRAZING RODS
$90.00
AO Smith ORM10206 Oem Replacement Motor
$49.99
DWYER MAGNEHELIC PRESS GAUGE INSTALL KIT
$8.00
MINT General Gen-Ear Water Leak Locator Pipe Detector
$1499.98
Century EPlus 3 Electric AC Nema Premium Motor 20HP NEW
$599.99
NEWJOHNSON CONTROLS RLDH10PM REFRIGERANT LEAK DETECTOR
$299.99
IS LKD100 Combustible Gas Methane Leak Detector
$15.99
NEW RITCHIE YELLOW JACKET GAS PRESSURE TEST KIT 78055
$44.99
LeakCheck Refrigerant Halogen Leak Detector HVAC CFC
$39.99
Johnson Controls LN-DSWSC2-0 LONWORKS®
$200.00
New 8" Round Krueger Steel Louvered Diffuser Model 1400
$44.66
Air Conditioner A/C Adapter R410A, Mini-Split Systems
$7.95
Trane Adaptive Control
$90.00
Universal Electric Blower Motor 110VAC HVAC 1/50HP
$3.00
TIF AUTOMATIC HALOGEN HFC / CFC / HCFC LEAK DETECTOR NR
$10.01
Vacuum Pump+Leak Detector+Clamp Meter HVAC Tool Set Kit
$335.00
AMETEK LAMB ELECTRIC BLOWER MOTOR MODEL 115935
$9.99
Inficon Tek-Mate Refrigerant Leak Detector - Mint - NR
$71.00
Lot of 9 MB P/N 663923 Refrigerant Valve New
$103.50
8 HEATING VENTILATION AIR HVAC TRAINING COURSES CD -NEW
$7.99
Promax RG5410A Refrigerant Recovery Machine
$260.00
Browning Fixed Bore Adjustable Sheave New
$9.95
Ten A-1 Adjustable Line Tap Valves 1/4" 5/16" 3/8" OD
$9.99
TIF8800 COMBUSTIBLE GAS DETECTOR
$50.00
Dayton Natural Gas Unit Heater, 400k BTU Model 3E251B
$1990.00
BELIMO AF120-S US DAMPER ACTUATOR AF120SUS NEW
$49.99
Emerson Industrial Solenoid Valve with Coil 1" FPT NIB
$0.99
Nutone LA203WH Plug-In Wireless Door Chime
$7.99
Copeland Scroll Compressor NEW NO RESERVE
$177.50
REFRIGERATION & AIR CONDITIONING TRAINING MANUAL
$4.99
JB DV-4E Eliminator Vacuum Pump
$122.57
Copeland ZR28K3-PFV=230 compliant scroll compressor
$185.00
Honeywell T874F1130, 2-stage thermostat with subbase
$10.00