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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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JADE CONTROLS JUNCTION BLOCK THERMOCOUPLE 36" NEW!!
$5.99
Johnson Controls Expansion Module XP-9105-8304 NEW
$35.00
Lot of (2) UDC2000 Honeywell Mini-Pro Temp Controllers!
$3.25
NEW SQUARE D BREAKERS----LOT OF 4 ----HVACR TYPE --NEW
$12.99
1 CASE OF AIRFLOW 20X25X1 PLEATED FILTERS NIB
$4.99
Isolation Valve Vacuum Pump/Charging Cylinder R12/R22
$11.00
JOHNSON CONTROLS Assembly Enclosure EN-EWC15-0 NEW
$55.00
LEYBOLD HERAEUS ULTRATEST F Leak Detector
$3950.00
FlowPro Industrial Pedestal Fan 30in 8500 CFM 1/4 NR
$69.99
LOT OF 7 NEW BREAKERS, I-T-E, MURRAY, CHALLENGER 15-40A
$14.99
JOHNSON CONTROLS HE-67N3-1B00W HUMIDITY ELEMENT SENSOR
$90.00
hvac
$450.00
COPELAND CONNECTOR BLOCK KIT 921-0227-00
$9.95
1 CASE OF 20X20X2 AIRFLOW PLEATED FILTERS
$5.50
Erwel Lot of 2 Thermostatic Traps 1/2'' R-30 Pres.0-30
$16.99
TIF Electronic Chargins Meter 9010A Scale
$60.99
Honeywell R8184M Protectorelay Oil Burner Control
$23.49
NRP Portable Refrigerant Recovery Unit ULVI 115 VAC
$149.99
Worthington AC recovery tank 50lb 50 pound
$19.00
Johnson Controls Humidity Transmitter HE-67N3-0N0BT NEW
$40.00
JOHNSON CONTROLS ELECTRIC MOTOR ACTUATOR M9216-BGC-2
$65.00
2-Stage Rotary Deep Vacuum Pump 29.92"Hg 1/4HP AC/HVAC
$119.95
Liebert Leak Detection System LDS 1000 New
$152.50
NEW CASE OF 16X20X2 PLEATED FILTERS
$6.25
HVAC - TOOLS - EQUIPMENT - LOT - ALL FACTORY NEW
$16.50
KELE Sequencer Control Module Four Stage MODEL UCS-421E
$55.00
20X25X2 AIRFLOW PLEATED FILTERS
$6.00
Refrigeration Gauges LIQUID FILLED
$59.00
Johnson Controls Expansion Module 8DO XP-9103-8304 NEW
$130.00
Suction Line Accumulator - Refrigerant - HVAC - 9 in
$9.99
New Sporlan Thermostatic Expansion Valve EBFVE-AA-C
$9.99
Maxitrol RV47L - 1/2"x1/2" Gas Regulator NEW!!
$9.99
R410a Adapter For Sanyo, Panasonic, Mitsubishi, Fujitsu
$7.95
Humidity Controller Switch (Humidistat)
$3.00
Hauck TBA-16-7.5-0-3 Blower Cooling Fan 7.5HP
$889.99
NEW MULTIFAN 4E25-120V EXHAUST FAN
$179.99
Refrigeration Gauges LIQUID FILLED
$49.00
JOHNSON CONTROLS HE-67N3-0N00W HUMIDITY ELEMENT SENSOR
$60.00
brass globe vavle
$25.00
Refrigeration Manifold Gauge Set with 6' hoses
$79.00
10- Tracpipe, Autoflare, 3/4" Tees & Straight Fittings
$123.49
New HONEYWELL MZV525E 3/4" Motorized Zone Valve
$69.99
Promax recovery unit*refrigeration # RG5410a Amprobe
$249.00
Harris Stay-Silv 6 Silver Brazing Alloy 28 Sticks
$13.49
JOHNSON CONTROLS CD-W00-00-0 WALL MOUNT C02 TRANSMITTER
$100.00
RobinAir Refrigerant Recycling System model #17150A
$329.99
Klein Tools/ Vaco nutdrivers 1/4-5/16-3/8 No Reserve
$31.00
DC3002 Honeywell 120VAC 60Hz Temperature Controller!
$0.01
GE Electric Motor 220/240V 1425RPM PH1 60HZ Cradle Base
$9.99
JOHNSON CONTROLS rotary actuator m9206-BGA-2 NEW
$40.00
1- Ritchie, Yellow Jacket, Brass Red Manifold Gauge
$9.99
Honeywell Gas Valve
$9.99
Taco 222-6 - 1-1/2" Universal (CI) Taco Flo-Chek NEW
$0.95
3 HVAC Condenser Pull Out Electrical Disconnect Boxes
$49.95
Inficon D-Tek refrigerant A/C leak detector
$77.00
NEW MILWAUKEE 18GA SWIVEL HEAD SHEARS # 6850
$56.99
Testo 330-1 Flue gas analyser Gas Oil efficiency tester
$1200.00
FlowPro Direct-Drive Drum Fan 28" 1/4 HP Cooling NR
$49.99
Halogen Gas CFC HFC Refrigerant Leak Checker Detector
$34.50
Lytron Radiator And Fan Assembly Heat Exchanger Cooler
$42.99
75,000 BTU Dayton Gas Furnace - Model 3E381A
$305.00
set of 6 Trane manuals/catalogs mid 1960s
$8.99
Honeywell Modutrol Motor
$22.50
Honeywell VR8305 Direct Ignition Dual Valve Gas Control
$10.49
lot of 3 Honeywell R8330 D 1039 electric heat sequencer
$99.00
Lot of 6 Ball Valves 1/4 SAE x 1/4 MPT V34905 JB Ind.
$11.50
JOHNSON CONTROLS T22AAA-1C HEATING THERMOSTAT NEW
$20.00
Refrigeration Manifold Gauge Set with 6' hoses
$79.00
Copeland Demand Cooling Module (120V) with Sensor!
$259.00
Suction Line Accumulator - Refrigerant - HVAC - 12 in.
$9.99
Fasco ¾ HP 3 Phase HVAC Electric Motor NEW
$0.99
BRAEBURN 3100 PREMIER SERIES 2/HEAT 2/COOL
$9.01
united technologies bolier control hk42fz011 HVAC
$20.00
lot of HVAC Tools,CPS scale, Davis inst, cooper & more
$130.10
SAFGARD 170SV LOW WATER CUTOFF NEW
$9.99
JOHNSON CONTROLS Solenoid Air Valve V-2410-7 NEW
$35.00
Refco Refrigeration service products& compounds digimon
$147.50
GATE VALVE
$9.99
Johnson Controls Expansion Module XP-9102-8304 NEW
$180.00
Liebert Datamate Computer Room Air Conditioning System
$3000.00
Alerton Thermostat MS-MOT3 w/Motion sensor NIB
$5.00
HONEYWELL RA117A 1047 PROTECTOELAY CONTROLLER NEW
$19.99
Baldor 14" Industrial Squirlcage Blower 1-1/2hp 3 Phase
$299.99
Lot of 5 HEAT SEQUENCER RELAY 305865 HVAC New
$14.99
5 Snap-Action Thermodisc HEAT SEQUENCERS 145F
$9.99
FURNACE - OUTDOOR - Wood & Coal Fired - 130,000 BTU
$7049.00
Suction Line Accumulator - Refrigerant - HVAC - 11 in
$9.99
Honeywell Aquatrol AQ475A Outdoor Temp Compensator
$49.99
TIF 5500 HALOGEN LEAK DETECTOR
$19.99
2 Snap-Action Thermodisc HEAT SEQUENCERS 145F
$6.99
Large 2 oz Compressor Oil/Dye Screw-in Injector AC/HVAC
$57.75
Goodman Complete Split-System, 3.5 Ton, 13 SEER
$1689.00
Lot of 2 HEAT SEQUENCER RELAY 305865 HVAC New
$7.99
1- A.O. Smith HVAC Motor, 1/6 HP 208-230 Volts
$19.31
JOHNSON CONTROLS motor actuator AP-VMA1420-0 NEW
$100.00
FlowPro Premium Air Flow Cooling Fan 25in 8400 CFM NR
$74.99
33- Various Brass Gas Ball Valves, 1/2" & 3/4"
$76.00
WHOLE HOUSE FAN - 24" - 1/3 Hp - 115V - 3,700 CFM
$454.00
ITT General Control MR-2G312G Thermopilot Valve NEW!!
$19.99