Google exhaust hood micro switch there are several diagrams.You want the exhaust to turn on and the make up air.electricial under the hood and the gas to turn off.
Kitchen hood replacement can be completed easily with a family member or a friend. While you may wonder why anyone would replace a kitchen hood, the answer usually is simple. Here is how to replace a kitchen hood.
Tools Needed
Warning: Remember that you are dealing with electricity, so stay away from water and use all safety precautions issued by the manufacturer.
Step 1 - Shut off Electricity
Remember to turn off the electrical supply to the old kitchen hood. You will need to do this via the circuit breaker box. Wait for 10 to 20 minutes and then test the wires with the circuit tester to double check that no electricity is being supplied to the kitchen hood.
Step 2 - Remove Old Hood
After you know for a fact that it is not receiving an electrical current, you can begin the process of removing the older kitchen hood. You should first take off the electrical wiring cover that is located by the light fixture. Then have your family member or friend hold up the old kitchen hood while you remove any screws or bolts from it. Once that is done, you can then freely slide it off. Double check that you have at least 12 inches of wiring to connect your kitchen hood to the wall. It should be noted that if you have a kitchen hood without vents, proceed to step 5 next. If your new kitchen hood has vents, you will need to locate the fan or vent duct. Once you have found it, you can open up the vent hole where it will belong. Open up the covering for the wiring and put the covering in a safe area for easy reach. Have your friend or family member hold up the kitchen hood and mark the areas where the screws or bolts will be. Then have them put down the kitchen hood and screw in the screws half way into the holes. After that, you can slide in the kitchen hood. Lightly pull the wiring through the proper holes and connect both black wires from the new kitchen hood to the black wire from the wall with a wire nut. Then connect the two white wires from the hood with the white wire from the wall, again using a wire nut. Next, connect the green wire to the green ground screw. Then place the wire covering back on. Finish tightening the screws in place. Check to make sure the fan and light work. If it is supposed to vent outside, make sure that the air is leaving the vent with no issues. If something does not work proper, repeat steps 6 and 7 until everything works well. Remember that you will be working with electrical equipment, so follow safety measures issued by the state or the city.
Step 3 - Check Wiring
Step 4 - Find the Ducts
Step 5 - Wires
Step 6 - Install the New Kitchen Hood
Step 7 - Route Wiring
Step 8 - Tighten Screws
Step 9 - Test
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