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

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what does it means p2258 code for 2003 Ford Focus , Smog test Failed


P2258 Secondary Air Injection System Control A Circuit High

http://www.motorcraftservice.com/vdi...f/OBDSM505.pdf

Secondary air systems typically utilize an electric air pump as well as one or two electrically controlled check valves to deliver air into the exhaust manifold.

The only vehicle which uses secondary air is the 2.3L PZEV Focus. The Focus uses a system with ported air. This means that airflow is delivered to each individual exhaust port. The secondary air pump is energized soon after start-up while the fuel system is in open loop and icing conditions are not likely. After the O2 sensors warm up, the secondary air pump continues to be energized while the fuel system goes into closed loop fuel. The secondary air system continues to run in closed loop fuel until the air pump is de-energized. The typical time period in which the AIR pump is energized is approximately 12 seconds.

The AIR pump flow check monitors the HO2S signal at idle to determine if secondary air is being delivered into the exhaust system. The air/fuel ratio is commanded open-loop rich, the AIR pump is turned on and the time required for the HO2S signal to go lean is monitored. If the HO2S signal does not go lean within the allowable time limit, a low/no flow malfunction is indicated. (P0411)

The electric air pump draws high current and must be energized through a separate relay. Both the primary and secondary circuits are checked for opens and shorts. First, the output driver within the PCM (primary circuit) is checked for circuit continuity (P0412). This circuit energizes the relay and the vacuum-operated check and control valve(s). Next, a feedback circuit from the secondary side of the relay to the PCM is used to check secondary circuit continuity (P2257, P2258).

Nov 22, 2013 | Cars & Trucks

1 Answer

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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