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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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NEW LINEMASTER PACKLESS LINE VALVE A-14835 3/8"
$9.99
COPELAND COMPRESSOR NEW ZR94KCE-TF5-250
$150.00
HVAC 1/6 HP OIL-LESS VACUUM PUMP
$20.00
BARBER COLMAN MA-418-0-0-2 Electronic ACTUATOR Drive NR
$9.99
NEW HONEYWELL PILOT BURNER Q345A 1321
$4.99
NEW LENNOX FLAME SENSOR KIT LB-79982C
$19.99
NIB TRANE TAYPLUS103A ADD-ON HEAT PUMP KIT
$19.99
HVAC
$9.99
NEW REVERSING GE S+S MAGNETIC MOTOR STARTER 32-42A 240V
$129.99
6 Rolls DUCK Henkel HVAC ALUMINUM FOIL DUCT TAPE 2x50YD
$24.99
HONEYWELL R8182H AQUASTAT AND PRIMARY CONTROL
$12.50
NEW REVERSING GE S+S MAGNETIC MOTOR STARTER 25-32A 240V
$129.99
HONEYWELL SELF GENERATING COMBINATION GAS CONTROL ~ NEW
$79.99
NEW BELL & GOSSETT CIRCUIT SETTER BALANCE VALVE CB-1/2S
$9.99
NEW ROBERT SHAW PNEUMODULAR REVERSING RELAY 2360-501
$9.99
TRANE COMPRESSOR NEW CHSA100KOAOC
$135.00
Honeywell Skinner Valve X53ADB2100
$44.99
ROBERT SHAW THERMOSTAT 9600
$9.99
NEW YELLOW JACKET R-410A COMPOUND GAUGE R410A
$14.99
LOT NEW ERIE MOTORTROL VALVES
$14.99
Trane Circuit Board For Gas Furnace
$49.99
Taco 007-F5 Circulator with Flange Set
$39.00
New Flexible Aluminum Ducting 4"x8' L23
$0.99
NIB BECKETT 51771U IGNITER TRANSFORMER WASTE OIL
$34.99
TWO=CARRIER CORPORATION reversing valve NIB
$30.00
2 NEW GENERAL TUBING CUTTERS 120 129 HVAC MINI NICE
$6.99
SPARCO aquamix mixing valve, AM 101C, 3/4" N.O.S.
$26.00
FIVE-RONKEN RUN CAPACATORS NIB
$10.00
CARRIER CEPL130202-02 COMFORT CONTROLLER 1600 BRAND NEW
$499.99
Lot of 4 19360005 Joucomatic/Asco 48V Solenoid Valves
$0.01
Lytron Radiator And Fan Assembly Heat Exchanger Cooler
$42.99
Taco 400 Hy-Vent Air vent
$3.99
NEW HONEYWELL PILOT BURNER Q345A 1313
$4.99
TIF/Blue Point ACT 725 Leak Detector
$39.00
oil burner cad cell for flame detection
$3.29
TRANE COMPRESSOR NEW CHSA150KOE00
$135.00
ASCO/RED HAT MEDIUN AIR VALVE NEW
$25.00
LOT NEW TELEMECANIQUE OPERATING COIL LX1-D16415
$9.99
UNIVERSAL PARTS DE-ICE CONTROL NIB
$15.00
NEW MUELLER CYCLE MASTER BALL VALVE AC17862 5/8"
$9.99
HONEYWELL TUBE & DIAPHRAGM ASSEMBLY 312809C NEW (e3)
$9.99
HONEYWELL RECTIFICATION FLAME AMPLIFIER **NEW*NEW*NEW**
$75.00
HONEYWELL S87B DIRECT SPARK 1056 IGNITION MODULE NIB
$34.95
ACCUSTAT 78 DEGREE SENSOR NOS!
$4.99
HONEYWELL PILOT BURNER P# 327 A 1626
$3.29
3 -SIEMENS POWERS POWERTOP PROCESS CONTROL 2-WAY VALVES
$9.99
DAYTON UNIT BEARING AXIAL FAN 4C654A NOS
$39.99
NIB HONEYWELL L8124A 1015 TRIPLE AQUASTAT RELAY
$74.99
Lot of 6 JB Industries Copper Tube Extensions A31005
$22.50
TECUMSEH COMPRESSOR (1 PH/MED. TEMP ~ AJR2425A) ~ NEW!
$149.99
LOT NEW TELEMECANIQUE THERMAL OVERLOAD RELAY LR1
$9.99
FASCO D1124 - 1/20 HP 115 V BOHN OEM REPLACEMENT MOTOR
$49.99
NEW HONEYWELL AQUASTAT CONTROLLER L4006E 1067
$29.99
NEW SPORLAN SOLENOID VALVE E3S120
$9.99
Safety Rollout fuse 167 C
$1.99
VERY NICE PAXTON CENTRIFUGAL TYPE BLOWER MODEL AT1400
$699.00
Trane airhandler variable speed circuit board CNT03600
$15.99
QMARK HEATER CWH-3407
$100.00
HONEYWELL FLAME DETECTOR CADMIUM SULFIDE
$29.99
NEW CONBRACO POP SAFETY VALVE 13-101-08 3/4"
$9.99
NEW TACO 571-2 SWEAT ZONE VALVE 3/4"
$52.00
Halogen Refrigerant Freon Leak Detector Air Pump HVAC/R
$79.95
SPORLAN CATCH-ALL SUCTION LINE FILTER-DRIER C-306-S
$14.50
REZNOR GAS FURNACE PARTS, Motor Wheel Bracket Cap. NEW
$9.99
New PennBarry Zephyr Bathroom Exhaust Fan Speed Control
$48.00
Yellow Jacket 46022 BRUTE II Manifold Gauges HVAC NEW
$164.99
NIB RANCO 012-1506 DUAL PRESSURE CONTROL AUTO RESET
$49.99
CPS-BLACKMAX! PISTON VALVE MANIFOLD SET! ~~~NEW!
$29.99
Thermo Well Stainless New*
$49.99
UNIVERSAL PARTS DE-ICE CONTROL NIB
$15.00
NEW RANCO ADAPTABLE REPLACEMENT A33-455 NARROW DIFF
$9.99
NEW ROBERT SHAW CONSTANT VOLUME CONTROLLER 2351-001
$9.99
NEW BARBER COLMAN PNEUMATIC ROOM HUMIDISTAT HK-1112
$9.99
HONEYWELL TUBE & DIAPHRAGM ASSEMBLY 312809C NEW (e3)
$9.99
(2) HED4OP16/100Z14 Mannesmann Rexroth Solenoid Valves
$0.01
Yellow Jacket 21985 PLUS II 1/4" Charging Hose set HVAC
$40.99
PRESSURETROL SWITCH HONEYWELL L404C 1147 LIMIT CONTROL
$9.99
Franceformer Interchangeable Ignition Transformer
$6.99
NEW REVERSING GE S+S MAGNETIC MOTOR STARTER 40-52A 240V
$129.99
MCDONNELL MILLER 51-2 LOW WATER CUT-OFF FEEDER CONTROL
$199.99
5 NIB AMTROL 109-15 FILTROL VALVE REPLACEMENT KIT LOT
$49.99
CIRCULATING PUMP MOTOR (230/460V) ~ 5 HP/3 PH/3500 RPM!
$149.99
HONEYWELL VISION PRO 8000 TOUCHSCREEN THERMOSTAT! NIB!
$51.00
4 NEW ROBERT SHAW LOW PRESSURE SELECTOR RELAY 2372-351
$9.99
Stulz P-2-U60/80 Ultrasonic Humidifier Control System
$199.99
NEW HONEYWELL PILOT BURNER Q314A 6102
$4.99
Carrier Temp Act. Switch hh 18ha 280
$1.49
Thermostat lot (4) used
$0.99
P66 JOHNSON CONTROLS Fan Speed Control PENN
$75.00
NEW BELL & GOSSETT MODUMATE OPERATOR ZONE VALVE M2 24V
$11.50
Ritchie yellow jacket 5 cfm
$5.00
NEW HONEYWELL POWERPILE GENERATOR & PILOT BURNER CS894D
$11.00
HVAC 30 inch Pilot Tube Kit for Gas Furnace
$0.99
HEATEX AB SWEDEN 36639 MODEL M HEAT EXCHANGER NW
$9.99
Hydronic Heating Zone Valve
$46.00
UNIVERSAL PARTS DE-ICE CONTROL NIB
$15.00
DELAVAN OIL FURNACE NOZZELS.NEW IN BOX.
$19.95
FIVE-RONKEN RUN CAPACATORS NIB
$10.00
Carrier Ignitor electrode lh 33wz 004
$8.99
Honeywell 2 stage thermostat model tw123 heat/cool
$20.00