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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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3M Curved Wand For Electronics Vacuum 78-8063-1540
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ASCO CAT# 82110D3 Pressure Switch With Valve 3/4"
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NEW JOHNSON CONTROLS INTERFACE MODULE R82AA-1
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NEW HONEYWELL PRIMARY AERATED PILOT BURNER Q179C 1009
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NEW PENN REPLACEMENT GAS VALVE VLV34A-623R
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CHX6 INGERSOLL-RAND CENTAC CENTRIFUGAL AIR COMPRESSOR
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Copeland HAT2-0033-CAGN208 Refrigeration Compressor
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Duro Dyne DDCR4 4 foot Circumferece Ruler Tinner rule
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NEW HVAC JOHNSON CONTROLS V46AB-1C 1/2" WATER VALVE
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NEW JOHNSON CONTROLS 3 WAY MIXING VALVE V-4324-1002
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Acme Transformer 120/240 to 24vac #TA-2-81142
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NEW CONTROLINE PNEUMATIC VALVE ACTUATOR MK-2690-0-0-1
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Hoffman condensate return pump unit Grainger 4RD29
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Malco 18F 18" Folding Tool HVAC Sheet Metal Hand Tools
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NEW PENN REPLACEMENT GAS VALVE VLV34A-629R
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EXTECH AN100 HEAVY DUTY VANE ANEMOMETER AIR FLOW METER
$35.00
NEW HONEYWELL SWITCHING RELAY R182A 1020
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NEW HONEYWELL REFRIG HIGH PRESSURE CUTOUT P430X 1243
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HOT SURFACE GLO-STIX IGNITOR KIT!!
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NEW HONEYWELL PROGRAMMABLE THERMOSTAT T7300A2007
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NEW HONEYWELL FAN CONTROL L4068E 1047
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NEW DEFINITE PURPOSE CONTACTOR CN-PBC403-277V 40/50a 3p
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NEW LENNOX THERMOSTAT 37304 SPDT
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NEW HONEYWELL REFRIG LOW PRESSURE CUTOUT P431X 1092
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Compressor mounting hardware Refrigeration
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20 HVACR Troubleshooting Problems (E-BOOK) on CD
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NEW AC/HEATING DP CONTACTOR CN-PBC403-24V 40/50a 3p
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LOT CARRIER GAS PILOT VALVE TEMPERATURE ACTUATOR SWITCH
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NEW HONEYWELL PRESSURETROL PRESSURE CONTROLLER PA404B
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NEW RANCO TEMPERATURE CONTROL C12-5010 A/C HEAT COOL
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NEW WHITE RODGERS INTEGRATED FAN CONTROL 50A50-241
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1" Honeywell Grundfos Taco Zone Valve
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NEW PENN COOLING TOWER A72CE-1 DPST OPEN ON RISE
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NEW HONEYWELL HUMIDIFIER CONTROLLER H49B1017 HUMIDISTAT
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NEW PENN MULTI STAGE THERMOSTAT T52AAE-2
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75 TON CARRIER WATER CHILLER
$8750.00
NEW HONEYWELL SMOKE DETECTOR TC49A 1021 120V
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RobinAir HVAC Cool-Tech Recovery,Model: 25175A
$385.00
NEW J CONTROLS LOW PRESSURE PROTECTION CONTROL P29NC-3
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EVALUATING REFRIGERATION SYSTEMS
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NEW WHITE RODGERS WARM AIR LIMIT CONTROL 416-4
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NEW HONEYWELL POWER SUPPLY R7305A 1004
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10 X 24 ACTIVATED CARBON FILTER WITH 550 CFM FAN
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Lufkin 95-4 Circumference Ruler 4 foot Tinners Rule
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NEW ROBERT SHAW 601XBM IGNITOR KIT 41-605
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Slightly used HVAC/Air Conditioning Maintenance Tools
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NEW HONEYWELL MICROELECTRONIC HEAT PUMP SUB BASE Q7300C
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HONEYWELL GAS VALVE!!(HOT SURFACE PILOT IGNITION)!!
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ROBERTSHAW HOT SURFACE IGNITOR 41-404 WEIL MCLAIN
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NEW GE DEFINITE PURPOSE CONTACTOR 25A 3 POLE CR353AB3AH
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Malco A60 Sheet Metal Adjustable Scribe Marking Tool
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NEW PENN AIR TEMPERATURE LIMIT CONTROL A25CP 10"
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NEW HONEYWELL HEATING COOLING HVAC CONTROL PANEL W402H
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NEW CARRIER VALVE REPLACEMENT HEAD 639B EF29CK261
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