How do you wire a fan relay for HVAC?

Quote from the video:
Quote from Youtube video: So the wiring diagram here and here show the contacts with the coil and the non powered state. So when you power the coil from four to two are going to be connected.

How do you wire a 12 volt radiator fan with a relay?





Quote from the video:
Quote from Youtube video: The other wire is going to go straight to 85 on the relay. Meaning it's open. Until it well one you have to have power on and two when the temperature sensor gets to the dedicated. Temperature.

How do I test my HVAC fan relay?

Quote from the video:
Quote from Youtube video: Set your meter to the lowest resistance level. And you should read approximately 70 80 ohms of resistance. We're showing 79 it's good now between the other side five and six should show closed two.

How does a HVAC relay work?

Inside the relay, that magnetism flips the switches to turn line voltage HVAC equipment on and off. A relay usually has multiple switches. All of them turn on and off when the magnetism from the coil switches them. But the only ones that do anything are the ones that you wire into another circuit.

How do you hook up a relay?

Quote from the video:
Quote from Youtube video: The red wire is the battery power out to the fan once the relay is energized. Black wire on both the fan connector. And the socket are providing ground to the relay.

How do you wire a 24v relay?





Quote from the video:
Quote from Youtube video: The positive of the power supply goes to positive of the coil. And the negative of the power supply. Goes to negative of the coil. Now since this is a 24 volt relay.

How do you install a fan relay?

Quote from the video:
Quote from Youtube video: The relay should be mounted away from direct heat our moving parts preferably a PI in the engine. Compartment. The gray wire is the ground trigger for the relay.

How do you wire a cooling fan switch?

Quote from the video:
Quote from Youtube video: Strip the end of the wire and twist it together and then bend it 90 degrees. You want to insert the wire into the ground pin which is usually pin 85.

Which relay is for radiator fan?

The fan relay is usually located near the bottom of the engine compartment on a metal frame member. The metal acts as a heat sink to keep the fan relay cool. So, unplug the connector at the relay and repeat the check for power. If you get power, you’ve got a bum relay.

How do you troubleshoot a relay?



Quote from the video:
Quote from Youtube video: Once you move the relay from the vehicle they will normally have a wiring diagram on the side of them how they work which pin goes to what internal part in the inside of the relay.

How do you wire a relay module?

Quote from the video:
Quote from Youtube video: Power supply and that's going to be connected to the relay on the VCC pin. And then we've got the gray cable connected to the ground which is of course connected to the ground on the relay.

What is the common terminal on a relay?

-NC- This is the Normally Closed Switch. This is the terminal where you connect the device that you want to power if you want the device to be on normally when the relay isn’t powered and off when the relay is powered. -COM– This is the common terminal of the relay.

What is relay circuit diagram?



Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized.

How do you read an electrical relay diagram?

Quote from the video:
Quote from Youtube video: First of all there is a rule of thumb in standard wiring diagrams that you should read the diagram from left to right. And from top down exactly like reading a book.

What are the 2 basic types of relays?

Types of Relays – A Thomas Buying Guide

  • Relays are electrically operated switches. …
  • Electromechanical relays have an electromagnetic coil and a mechanical movable contact. …
  • Solid-state relays are solid-state electronic components that do not have any moving components, which increases their long-term reliability.

How do you wire a 4 pin relay?

Quote from the video:
Quote from Youtube video: Through a switch or whatever. So then 30 is connected straight to the battery or bus bar or junction box somewhere on your vehicle. Going straight back to the battery.

What are the 4 pins on a relay?



The difference between a 4 and 5 pin relay is that a 4 pin relay is used to control a single circuit, whereas a 5 pin relay switches power between two circuits. 4 pin relays use 2 pins (85 & 86) to control the coil and 2 pins (30 & 87) which switch power on a single circuit.

What is pin 87a on a relay?

Numbers of a Relay



Note that each pin is numbered. 85 and 86 are the coil pins while 30, 87, and 87a are the switch pins. 87 and 87a are the two contacts to which 30 will connect. If the coil is not activated, 30 will always be connected to 87a. Think of this as the relay in the Normally Closed (OFF) position.