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Heating and AC Controls Online

Go to Johnson ControlsJohnson Controls linkJohnson Controls:Johnson Controls offers a wide variety of HVAC Controls, including actuators, control panels, control sensors, current sensors and transducers, thermostats, and valves.
– http://www.johnsoncontrols.com/buildings/hvac-controls
Go to Johnstone SupplyJohnstone Supply linkJohnstone Supply:HVAC/R Controls | Johnstone Supply | Wholesale Distributor to the HVAC, Refrigeration and Property Maintenance Industries
– https://www.johnstonesupply.com/storefront/hvacr-parts/controls
Go to Interstate ControlsInterstate Controls linkInterstate Controls:IEE Interstate HVAC Controls | Products and Services
– http://www.interstatecontrols.com
Go to NECCNECC linkNECC:NECC is an Authorized Distributor for HVAC controls manufacturers such as Honeywell, Johnson Controls, Belimo, Siemens, Barber Colman, KMC, Erie, with over 50 HVAC OEMs in our line card.
– https://necc-controls.com/product-lines
Go to Industrial ControlsIndustrial Controls linkIndustrial Controls:Get your HVAC controls, CO2 sensors, transmitters, smoke detectors and water detectors at Industrial Controls.
– https://estore.industrialcontrolsonline.com/products/HVAC-CONTROLS
Go to HVAC Parts OutletHVAC Parts Outlet linkHVAC Parts Outlet:Get Universal Blower Motors, AC Control Boards, Furnace Control Boards at HVACPartsOutlet.com. Buy online .... The industry Leader in Online HVAC Parts!
– http://www.hvacpartsoutlet.com
Go ICM ControlsICM Controls linkICM Controls:Find heating controls, furnace controls, voltage monitors, and a variety of HVACR electronic controls from ICM Controls an American manufacturer of electronic controls.
– http://www.icmcontrols.com
Go to TraneTrane linkTrane:Tracer Controls | Trane Commercial
– http://www.trane.com/commercial
Go to HVAC Part SupplierHVAC Part Supplier linkHVAC Part Supplier:Controls - Ignitions Modules & Boards Switches Contactor Motors Valves Kits Filters Relays & Transformers Compressors Timers & Contactors Air Systems Actuators Capacitors Controls Transducer Power Supply Part Replacement HVAC parts.
– http://www.hvacpartsupplier.com/controls
Go to ITT ControlsITT Controls linkITT Controls:ITT Controls - Your complete supplier in the oil and gas industry.
– http://www.ittcontrols.com
Go to Alps ControlsAlps Controls linkAlps Controls:AlpsControls.com is the world's largest online marketplace for HVAC and building automation control parts and peripherals.
– https://www.alpscontrols.com
Go to Apex ControlsApex Controls linkApex Controls:HVAC, Valves, Thermostats, Electric Motors, Pumps, Actuators, Coils, Transmitters, Sensors, Barber Colman, Honeywell, Johnson Controls, Robertshaw, Invensys,Belimo, Kreuter, White Rodgers, Veris, TCS Basys, Siemens.
– http://www.apexcontrols.com
Go to HoneywellHoneywell linkHoneywell:Honeywell has the HVAC industry's most comprehensive line of building controls, valves, actuators, dampers, sensors, economizers, variable frequency drives and temperature controls. Honeywell solutions can be found in over 10 million commercial buildings worldwide.
– https://buildingcontrols.honeywell.com
Go to Delta ControlsDelta Controls linkDelta Controls:Delta Controls offers complete HVAC system solutions with easy-to-use HVAC controls for large central plants to zone terminal units and sensors.
– https://www.deltacontrols.com/products/hvac
Go to Distech ControlsDistech Controls linkDistech Controls:The Distech Controls HVAC controls are designed for dependable long-term performance. Come here to find out more about our BACnet and LONWORKS controllers.
– http://www.distech-controls.com/en/me/products/hvac-control

Direct From The Tech...
Compressor Time Delay Relays

Compressor time delay relays are low-voltage-controlled timers on the outdoor condenser that prevent compressor short-cycling. Short-cycling occurs when the compressor shuts off and tries to start before the system's refrigerant pressures equalize (both suction and discharge pressures are the same psi). There are several reasons a compressor would short-cycle; the most common being indoor temperature fluctuations. This means the thermostat is calling for cooling or heating too soon between run times. An undersized or oversized system, the system is not performing properly (e.g. filters dirty, low refrigerant levels, etc.), extreme indoor temperature changes (cooling down then heating up or vice versa), or even the little one playing with the thermostat are reasons for a compressor to short-cycle. Newer systems have time delays that are factory installed in the condenser. Older systems or "builder/contractor" models may not contain a compressor time delay. These little controls can be the "saving grace" for the compressor from internal damage. Compressor time delay relays should be added for extra protection or when an existing unit needs that extra "relief" between run times. There are several different types of compressor time delay relays on the market. Most of your common time delays are wired in series with the low-voltage control wiring and activate "on make" or "on break". "On break" means that the delay timer activates when the unit shuts off. "On make" means the delay timer activates when the unit calls for heating or cooling. Most of your compressor time delay relays have switches to set the delay time in seconds or minutes. Some relays have a fixed delay time. The most common delay setting for a residential system is 5-10 minutes.

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HVAC Controls: References & Online Articles

Frequency Drives