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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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ROBINAIR REFRIGERANT MANIFOLD GUAGE / AIR CONDITIONING

$9.99
Rooftop Fan / Centrifugal Blower Model CPS - 5 HP #j3

$150.00
NEW! BELL & GOSSETT REDUCING VALVE B-38 P/N 110190

$24.95
HONEYWELL R7184P INTERRUPTED OIL PRIMARY CONTROL NEW

$99.99
Ritchie Yellow Jacket charging hose 1/4"Plus II 50 ft

$70.00
JOHNSON CONTROLS M150XGA-1 MOTOR ACTUATOR 150 LBS-IN

$99.00
Asco Solenoid Valve #8215A51VM 120 Volt 1" New

$9.99
New Suction Accumulator

$9.99
RefTech MicroVac Refrigerant Freon Recovery Unit HVAC

$266.51
Boiler Tube Parallel Gear Train Drive TUBE EXPANDER

$19.99
Promax amprobe RG5410hp Freon recovery unit

$227.50
New USA 30lb Refrigerant R134a R-134a R134-FREE FREIGHT

$125.00
Boiler Tube Right Angle Bevel Gear Drive 1"

$49.99
BACHARACH SLING PSYCHROMETER MODEL SAC

$11.00
AIR FILTERS PRE CUT

$0.99
NEW COMPOUND GAGE GAUGE HVAC REFRIGERATION MANIFOLD

$3.99
Fieldpiece SC76 Auto Ranging Clamp Meter With NCV USED

$50.00
SIEMENS APOGEE LOCAL USER INTERFACE

$15.50
ASPEN 3-Ton R22 R410 Evaporative Air Conditioner A-Coil

$125.00
8 MSA CHEMICAL CARTRIDGES FOR RESPIRATORY MASKS - GMC

$5.99
Parker SPD-162 Super Pre-Dryer

$0.99
NEW! TRANE FAN CONTROL CNT01537

$49.99
White-Rodgers 3L01-191 snap disc limit controller 190F

$0.99
HVAC HEATING A/C EVAPORATING COILS 3 TON HIGH EFFICIENC

$50.00
NEW! Bell & Gossett Bearing Assembly

$49.99
TIF 9010A Slimline Refrigerant Scale w Case NR Tool

$66.00
Manifold Gauge 5'High Pressure Hose R407 R134A R404 R22

$36.00
Dayton shaded pole blower - model 2C782 - low cfm - NIB

$18.00
HONEYWELL LA409A AQUASTAT CONTROL NIB LA409A1X

$49.99
2-Stage Rotary Deep Vacuum Pump 29.92"Hg 1/4HP AC/HVAC

$119.95
HONEYWELL RA116A PROTECTORELAY RELAY CONTROL NIB

$149.99
HVAC Ridgid Tin Snip Sheet Metal Cutters Aviation Snips

$30.00
HONEYWELL L444A IMMERSION AQUASTAT CONTROL NIB

$49.99
IS LKD100 Combustible Gas Methane Leak Detector

$15.99
Assorted - New - HVAC - Contractor Tools Lot

$39.00
QMARK MUH10-4 MUH104 10KW 480V 3 PHASE UNIT HEATER NIB!

$600.00
NEW Trane & American Standard Blower Inducer BLW00864

$49.99
New sealed DuPont R-22 R22 freon 30 lb. can for HVAC

$158.00
2 Air Conditioning Floor Vent Register Grille HVAC

$3.99
200 Ton York Chiller

$25000.00
NEW! Johnson Controls G67BG-4 IGNITION CONTROL

$29.99
NEW Yellow Jacket SUPEREVAC LCD Vacuum Gauge 69075 NIB

$202.50
CPS CC220 COMPUTE-A-CHARGE REFRIGERANT CHARGING SCALE

$81.00
Boiler Tube Right Angle Gear Drive TUBE EXPANDER TOOL

$24.99
Air Brush/Flush Tool Kit 5-ft Hose w/Gun Assembly HVAC

$35.95
New RECHI Air Conditioner Compressor 5238 BTU

$5.20
TURBOTORCH SILVERFLOW BRAZING ALLOY 1# 30 RODS HVAC SF1

$26.01
QMARK MUH10-4 MUH104 10KW 480V 3 PHASE UNIT HEATER NIB!

$199.95
19 Book CD * HVAC Air Conditioning | HEATING Manuals CD

$0.99
NEW HONEYWELL ML7421A1032 DIRECT COUPLED VALVE ACTUATOR

$79.99
TACO 2 WAY ZONE VALVE REPLACEMENT POWER HEAD NEW

$20.00
HONEYWELL / SID HARVEY R8184G OIL PRIMARY CONTROL

$149.99
R22 FREON , R-22 FREON

$148.50
NIB Robertshaw 700-406 24 Volt Standing Pilot Gas Valve

$64.99
FlowPro Direct Drive Drum Fan 42" 10,100 CFM 3/4 HP NEW

$60.00
New CEM GD-3300 Combustible Gas Leak Detector

$85.99
INFICON D-TEK Leak Detector 703-006-G1 HVACR

$195.50
Halogen Leak Detector Model TIF 5000 w/case EXC COND

$80.00
NEW YELLOW JACKET HEAVY-DUTY SWAGE/FLARE KIT 60440

$80.99
HONEYWELL R7849A1023 ULTRAVIOLET FLAME AMPLIFIER NIB NR

$41.00
Emerson TXV Expansion Valve 5/8*1-1/8 10 Ton R22 HVACR

$29.99
3 Sporlan R22 Thermostatic Element Kits NIB

$7.99
Inficon D-TEK Refrigerant Leak Detector

$150.00
Digital multimeter plus other tools

$10.50
LeakCheck Refrigerant Halogen Leak Detector HVAC CFC

$39.99
NEW! Still In Box 10 Pressure & Thermal Limit Switches

$69.99
NEW! TRANE 2 STAGE GAS VALVE VAL08027

$49.99
NEW TEMP-TRAX NETWORK TEMPERATURE MONITOR W/50' PROBE

$49.99
Air conditioner service Robinair ratchet tubing cutter

$22.00
HONEYWELL VS820 PILOT COMBINATION GAS VALVE CONTROL NIB

$149.99
Complete Abatement Technologies duct cleaning system.

$7000.00
EXHAUST FAN Industrial - Belt Driven - 42" - 115V

$629.00
NEW DAYTON 48" COMMERCIAL CEILING FAN

$59.99
Emerson TXV Expansion Valve-Less Flange 5 Ton R22 HVACR

$19.99
Alerton Building Automation Controls

$315.00
BELL & GOSSET PDB375 3" BRONZE BODY PUMP 1PH 3/4HP

$599.00
New Dayton 1/15 HP Shaded Pole Blower Motor 1000 RPM !!

$24.99
Emerson TXV Expansion Valve 3/8*1/2 5-1/2 Ton R22 HVACR

$19.99
Reznor F165 Unit Heater Gravity Vent Natural Gas - NEW

$850.00
Digital multimeter plus other tools

$21.01
R-404a Refrigerant Sealed, NO RESERVE!!!!

$152.50
ROBINAIR COOL TECH AC/RECOVERY UNIT MODEL # 25175a

$100.25
HONEYWELL / SID HARVEY R8184M OIL PRIMARY CONTROL

$149.99
MARINE HEAT EXCHANGER

$150.00
Natural gas or propane burner 8.5" long x 5" across

$9.99
Honeywell SmartValve System Control SV9501M2528

$26.00
Chicago Blower Size B5 New

$1600.00
Air Brush/Flush Tool Kit Canister Hose Gun Assembly AC

$49.95
Honywell HAVC

$5.00
Boiler Furnace Heat Oil Gas Coal HVAC 19book CD Library

$0.01
ROBERTSHAW 7000MVRLC 7000 MVRLC GAS VALVE, NEW!

$24.99
R 22 Air Conditioning Refrigerant 30 # Unused Virgin

$200.00
TUBEAXIAL TUBEMASTER INDUSTRIAL PAINT BOOTH EXAUST FAN

$200.00
HVAC HEATING A/C EVAPORATING COILS 4 TON HIGH EFFICIENC

$50.00
Cleveland AFS-405 Air Pressure Sensing Switch HVAC DDC

$9.99
2 Sporlan Thermostatic KT-33-DCP70 & KT-33-FCP60 NIB

$5.99
Friedrich WE16B33A WallMaster Heat Air Conditioner NEW

$650.00
WHOLE HOUSE FAN - ATTIC FAN - 30" - Direct Drive

$421.00
NEW! EF33CZ201 2 STAGE COMBINATION GAS VALVE

$89.99