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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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Johnson Controls Metasys NCM 401
$100.00
XPT Duct Leakage Tester- DLT6-1200 (6 inch)
$2799.99
JB DV-2000N 7 cfm Refrigiration Vac Pump
$200.00
Malco 12F 12" Sheet Metal Folding Tool 3/8" 1"
$9.99
Brand New HoneyWell Zone Valve V8043 F 1036
$47.00
A/C MANIFOLD GAUGE SET A C R134a W/ CARRYING CASE
$16.50
Halogen Gas CFC HFC Refrigerant Leak Detector Checker
$29.85
POWERS 656-0014 3 Way Pneumatic Mixing Valve- New cond
$42.50
Large Lot of Hago Steinen Oil Burner Nozzles No Res
$15.72
Carrier Trailer Mount Diesel Electric Freezer Unit
$399.00
Goodman, Amana 2 stage Gas Valve NIB White Rogers HVAC
$45.00
HONEYWELL DUAL AQUASTAT HEATING HVAC BOILER CONTROL
$30.00
New Halogen Refrigerant Freon Leak Detector HVAC/R Tool
$49.95
Malco No. 12 12" Sheet Metal Folding Tool 3/8" 1/2"
$9.50
Halogen Leak Detector TIF 5000 w/case in Good Condition
$0.99
A/C MANIFOLD GAUGE SET A C R134a
$0.99
Malco Bit Sheet Metal Adjustable Hole Circle Cutter 12"
$15.51
Riello Capacitor for Riello Burners
$15.00
Zone Valve
$33.00
CLARCOR AIR FILTERS HE40 SIZE 24X24X4 6 FILTER/ CASE
$59.99
New 12" Round Neck Krueger RM1 Round Face Diffuser
$92.14
Contactor 2 Pole 30 AMPS 24V 50/60Hz New White Rodgers
$9.99
New KI&BNT HVAC Halogen Freon Refrigerant Leak Detector
$62.99
Lot 5 Rheem Air Handler Control Boards P/N 47-100436-05
$19.99
Johnson Controls AP-VMA1420-0 Controller Metasys
$19.95
DETECTO-PAK III GAS LEAK SURVEY EQUIPMENT EXCELLENT @
$499.00
Freon CFC HFC Halogen Gas Refrigerant Leak Detector A4
$21.99
Dayton 3M226G 1/4 hp HVAC Condenser Fan Motor - NEW
$69.95
NEW TRANE 15 TON 3D SCROLL COMPRESSOR PART# COM06438
$600.00
LeakCheck Refrigerant Halogen Leak Detector HVAC CFC
$39.99
TLV 1/2" NPT THERMOSTATIC STEAM TRAP CF8 SS NIB 081E4
$29.99
Unassembled refrigeration bypass valve controllers
$20.00
HONEYWELL VISION PRO 8000 TOUCHSCREEN THERMOSTAT! NIB!
$68.00
BACKDRAFT DAMPER 6 inch inline fan exhaust hvac
$16.00
Fireye EP390 Programmer Module
$49.99
Aprilaire Model 51 Current Sensing Relay 120 VAC NIB
$34.50
Fireye EP380 Programmer Module
$49.99
12 ACCESS VALVE FITTINGS 1/4 COPPER TUBE HVAC BRASS TEE
$9.50
Honeywell L4017A1188 Fan / Limit Control 60 to 140 NOS
$42.50
Liebert processor board and display
$75.00
New 14" Round Neck Krueger RM1 Round Face Diffuser
$101.59
MILLIPORE VACUUM/PRESSURE PUMP MODEL XX5500000 115V
$36.38
Fluke 902 HVAC Clamp Meter
$125.00
JB Refrigerant Guages w/4' Yellow Jacket Hoses ~estate~
$19.99
BACKDRAFT DAMPER 4 inch inline fan exhaust hvac
$10.00
Halogen Refrigerant Freon Leak Detector Air Pump HVAC/R
$49.95
ZoneAire heat/AC unit (VA) 08-2905 K-152
$9.99
25 HP motor - used - $50
$50.00
ASCO Solenoid Valve 2-Way NC 1/4", 120/60 New in Box
$9.95
RECLAIM MACHINE (BLUE RECLAIMER) * ALL REFRIGERANTS *
$525.00
Dual 134a / R-12 Aluminum Gauge Set with Hoses 98661
$118.65
2Stage Rotary Vane Deep Vacuum Pump 29.9" Hg HVAC R134a
$117.75
Manifold Gauge 5'Hose Set HVAC Diagnosis R134a/R22/R404
$49.95
4 X 12 ACTIVATED CARBON FILTER HYDROPONIC ODOR SCRUBBER
$52.20
COPELAMETIC KAK1 0100 TAC COMPRESSOR - NEW
$99.00
Halogen Gas CFC HFC Refrigerant Leak Detector Checker
$29.94
Sporlan - Solenoid Coil Kit
$9.99
HoneyWell R8184G 4009 Protectorelay Oil Burner Control
$39.01
halogen refigerant leak detector air conditioning 5500
$5.00
Refrigerant Recovery Tank
$75.00
Honeywell Micro Switch Terminal Block 18PA1
$9.99
XPT Duct Leakage Tester- DLT8-1800 (8 inch)
$3199.99
Ultrazone Motorized Damper 14 X 8 ND 2308 (NEW)
$29.99
Two IS LKD100 Combustible Gas Methane Leak Detector
$19.99
Squirrel Cage Blower
$20.50
NEW Tecumseh Compressor RKA5490EXA 115 Volt
$79.99
Contactor 2 Pole 30 AMPS 24V 50/60Hz New White Rodgers
$9.99
BACKDRAFT DAMPER 4 inch inline fan exhaust hvac
$11.01
Contactor 2 Pole 30 AMPS 24V 50/60Hz New White Rodgers
$9.99
New 10" Round Neck Krueger RM1 Round Face Diffuser
$78.75
VACUM PUMP * 6CFM VACUUM PUMP * DUAL VOLTAGE
$320.00
SPP6 Solid State Relay Hard Start Booster A/C Capacitor
$14.99
New HVAC Boiler Control Hays Cleveland Linear Actuator
$49.99
New Suction Accumulator ~ Stops Compressor Slugging!
$9.99
Lytron Radiator And Fan Assembly Heat Exchanger Cooler
$42.99
New 6" Round Neck Krueger RM1 Round Face Diffuser
$59.03
TACO 007-F5 CIRCULATOR PUMP HVAC BOILER HEATING
$31.01
Industrial Pedestal Fan 30" 8500 CFM 1/4 HP NEW
$114.99
HVAC ALUMINUM UL181 LISTED TAPE 2.5IN X 50YDS 6 ROLLS
$29.99
New Honeywell Damper Motor M836A 1042
$45.00
Incline manometer slope gauge air flow meter DWYER
$42.00
10 X 24 ACTIVATED CARBON FILTER WITH 550 CFM FAN
$189.95
NEW TRANE 15 TON 3D SCROLL COMPRESSOR PART# COM07558
$1000.00
HONEYWELL V8043 E1012 Motorized Valve BRAND NEW!!!!
$0.99
REZNOR V3T CORE 2 NATURAL GAS Works perfectly
$489.00
Microamp meter microammeter in case with test leads
$9.00
NEW RELAY #84-1A-24 AC Only 250V 8FLA 18LRA COIL 50/60H
$23.99
CC500 COMPUTE-A-CHARGE SCALE AUTOMATIC COMPUTER
$39.95
27 Ton Single Screw Compressor, R-22 Condensing System
$1550.00
New 8" Round Neck Krueger RM1 Round Face Diffuser
$63.79
REFRIGERANT LEAK DETECTOR LS790B
$30.00
410 a MANIFOLD W GAUGES 5 FT TEFLON SEAL HVAC REFCO
$19.99
Lot: 2 RFLS Series Refrigerant Couplings/Couplers, HVAC
$9.99
XPT Duct Leakage Tester- DLT5-600 (5 inch)
$2399.99
Easy-Lite long reach refillable lighter hvac tool
$20.50
GOODMAN GkS 91155DXAD 2 Stage 95% Gas FURNANCE
$625.00
Loren Cook Exhaust Fan - Brand New
$300.00
Nelmor Blowers, Spencer Blowers 10 Hp, 4 in all
$950.00