Furnace Exhaust Venter Blower replacement


  #1  
Old 01-22-19, 12:25 PM
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Furnace Exhaust Venter Blower replacement

1. I am replacing my Lennox Furnace Exhaust Venter Blower and before I put it back together I was wondering what type of silicone sealer I should use between the fan shroud and the furnace? See picture. Would I put the sealer on both sides of the gasket or just the one side facing the furnace? Thanks

2. In addition, should I also replace my igniter and pressure switch, because my furnace is almost 17 years old (is there anything else I should replace)?

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- ARMSTRONG Ultra V Tech 91
- Model G1D91AU100D16C-1
- Installed date Aug 2002
- Nest Thermostat E
 
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Old 01-22-19, 05:21 PM
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I see red..... was there silicone on the old gasket ? Not all gaskets require the RTV.
You would use Permatex high temp red RTV.... if needed.
 
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Old 01-23-19, 05:09 AM
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Most often pressure switches that work with the draft induction blower die because of water or other contamination. Your furnace and tubing looks squeaky clean. I would not replace the switch unless you have reason. I might buy the part and have it on hand in case it dies on a cold Sunday so you can fix it right away. The same goes for the ignitor. They do tend to die with old age but if your's is still going strong I don't see a need to replace it. But, keeping one on hand wouldn't be a bad idea.
 
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Old 01-23-19, 07:38 AM
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PJmax it doesn't appear to have had silicone applied that I know of . The red might be the flow restricting ring. The gasket does appear to have some water damage on the back side that is facing the housing. The other side of the gasket looks okay. Would it be difficult to buy a new grey gasket like this and just not worry about applying silicone? Or should I just let it be and put it back on? Thanks
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Old 01-23-19, 07:43 AM
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Pilot Dane I appreciate the information about keeping the parts on hand. Especially if the switch or igniter goes out when all the HVAC stores are closed.
 
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Old 01-23-19, 09:40 PM
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That gasket looks in good shape. You can reuse it.

I wouldn't bother keeping a pressure switch on hand.
I would definitely keep a spare igniter. They can go bad in a snap with no warning.
 
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Old 01-24-19, 08:52 AM
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I'll reuse the gasket than. Thanks for your help!
 
 

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