Tip & How-To about Carrier 38BRC036 Air Conditioner

Relay Wiring tips and tricks Simple circut. What to look/lookout for

Typically if you want a circuit completed when energized you use C (Common) and NO (normally open). This means that the contact will close when energized and thus complete your circuit. However in some cases a relay is used to stop current from flowing and when energized the contacts used are C and NC (Normally Closed) meaning that the circuit is closed when the relay is off and open when energized.

Other things to consider if "rigging a new circuit".

More precisely, what exactly are you going to accomplish:
Turn On a motor, or light
Turn Off a motor, or light
or complete a timing sequence,
Turn On A heater
Lock out a motor
Isolate a motor

A simple relay works but you had better make sure 2 things 1. your relay is not TOO HEAVY on the VA of the coil (this would cause a control transformer to burn out) is the correct voltage coil, AND 2. BE SURE YOU KNOW WHAT HP OR AMP DRAW your relay will be expected to hold while energized (or de-energized which ever the case may be). This latter is the contact rating. Too small and it will burn out. Too heavy, well I see not much trouble with too heavy a contact rating except it usually has heaver VA draw form the coil the bigger the contacts are.

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1 Answer

I have a 240v electric motor with 3 wires black,white,red how do you hook this up to a relay


Think of a relay as a simple light switch, breaking the hot on a "NO", normally open, set of contacts. When unit isn't on, the hot is "open", therefore motor not working. When the relay is energized by the g wire from the tstat, those contacts close, completing the circuit of 240. So, white carrying 120 constantly to the motor, black carrying 120, through the relay, to the motor.

Aug 13, 2017 | Heating & Cooling

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Where is the neutral safety switch located on the transmission and is there another switch that would keep the starter from engaging?


If it is an automatic it is part of the Range sensor switch on the transmission where the cable hooks up from the linkage.

May 12, 2016 | 1999 Chevrolet Chevrolet Camaro

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how to reset relay for a 96 mercury villager


Relays are energized & then their contacts close,
completing a circuit

There is no reset,they go back to normally
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Jun 17, 2011 | Mercury Villager Cars & Trucks

1 Answer

wiring a relay contact


Typically if you want a circuit completed when energized you use C (Common) and NO (normally open). This means that the contact will close when energized and thus complete your circuit. However in some cases a relay is used to stop current from flowing and when energized the contacts used are C and NC (Normally Closed) meaning that the circuit is closed when the relay is off and open when energized.

Other things to consider if "rigging a new circuit".

More precisely, what exactly are you going to accomplish:
Turn On a motor, or light
Turn Off a motor, or light
or complete a timing sequence,
Turn On A heater
Lock out a motor
Isolate a motor

A simple relay works just as ac fixer said but you had better make sure 2 things 1 your relay is not TOO HEAVY on the VA of the coil (and like he said is the correct voltage) AND 2 BE SURE YOU KNOW WHAT HP OR AMP DRAW your relay will be expected to hold while energized (or de-energized which ever the case may be).

DOes this help you?
If so please rate me as high as you can. If not I will need to know more than what you have asked. Please be as speciffic as you can with clarity that you understand and post back. Thanks for using fixya.

May 15, 2009 | Coleman Heating & Cooling

1 Answer

Blower fan stays running. Fan relay attached to small circuit board (coil tabs [timer?]). Capacitor on small circuit board had ''fallen out'' of ic board. Tried to get replacement board, and was sold just a standard relay - told that relay alone replaced the previous relay -and- circuit board configuration (?). Problem still exists (no change). Also changed thermostat just to eliminate as a possible cause, but seems like problem must be in the fan relay area. Question about the wires attached to the relay also.


If fan runs on 220 you have one constant 110 that always goes to the motor. The other 110 goes through something that will turn it off and on. This being the relay, just like a light switch. This 110 will land on the "N O" (normally open) set of contacts. "Open" meaning the voltage can't pass through. When the relay gets energized the contacts close. This completes the circuit, the motor gets the 220 it needs and it runs. On the relay coil (how it gets it's energy) you need a low voltage common and you need the "G" wire from the tstat. Likely green in color, this is your indoor blower low voltage wire. When the tstat calls for fan, cool or heat, the relay energizes, closes the contacts, fan runs. Good Luck!!

May 16, 2017 | Carrier Heating & Cooling

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