Our Do-It-Yourself Help Section

See Archive On The Right For More Articles!

Wiring: Generic 120V coil relays.


This How To focuses on how to wire a general purpose relay with a 120 Volt coil.

Operation:
The relay is typically used to start (or slave) a secondary device like a booster or exhaust fan. A 120 VAC coil means that you apply 120 VAC to the coil contacts (black wiring) to energize the relay and close the switched contacts (red wiring). When the 120 VAC to the coil contacts is removed, the relay de-energizes and the switched contacts open.

The switched contacts are rated at 10 Amps, meaning they will switch a device that draws 10 Amps OR LESS (at 120 Volts).

Diagram:
The diagram below shows 120V being applied to the coil contacts (black wiring, terminals 7 and 8). The switched contacts are shown in red wiring, terminals 3 and 5. The 120V to the booster fan passes through the switched contacts to start and stop the fan.




hvac Article Archives hvac
hvac
hvac Radon Mitigation
hvac Starting a booster fan with a current switch
hvac Quiet Kitchen Ventilation
hvac Selecting correct fan for a bathroom
hvac Using an in-line FR series fan
hvac Ventilating multiple bathrooms with 1 fan
hvac Whole House Fans
hvac Dryer Booster Fans (Residential)
hvac Wiring: 1 fan and 2 FD 60EM timers
hvac Wiring: 1 fan serving 2 baths with 1 switch per bath
hvac Wiring: Generic 120V coil relays
hvac Server/Electronics Cooling
hvac ACT Pumps - Save Money, Water, and Energy
hvac ACT and Laing Instant Hot Water Systems
hvac Ductwork Sealing
hvac Duct Booster Fans
hvac Stego Wrap for Sealing Crawl Spaces
  -----------------------------
hvac Conversion Calculator
hvac Air Properties Calculator
hvac hvac



Parts:    LY2N General Purpose Relays

Caution: Disconnect and lock-out all power sources during installation as severe injury or death can result from electrical shock due to contact with high voltage conductors. Ensure all installations are in compliance with applicable electrical codes and that the installation is completed by qualified installers familiar with the standards and proper safety procedures for high-voltage installation.

As always, if you would like to ask more questions about this or other technical topics give us a call at 877-711-4822 - 9-5 PST. Live people for technical and sales support - an Internet first!

Disclaimer:
Advice and information given through our representatives is checked for usability and conformance with most codes. You as the user, however, have the responsibility for verifying conformance with local codes and standards and ensuring a safe installation. Although HVACQuick.com may employ and use professionals, their advice is not meant as substitute for professional engineering services. It is the customer's responsibility to hire and retain suitable engineering and architectural professionals as required.