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lutful
... of ideas
Premium
join:2005-06-16
Ottawa, ON
kudos:1
reply to lutful

Re: noisy furnace fan

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I have been planning to replace the furnace and a/c and water heater ... for 3 years now. Hopefully next year.

Anyway, I took some photos just now. It is a York furnace. The label says motor is permanently lubricated.

There is definitely no "draft inducer" fan. I can see the flames through the grill. Some combustion air seems to come in through the open pipe nearby and the rest from the basement.

There is a schematic attached to the back of the blower compartment door. They seem to be using HIGH and MED speeds (although I only hear high speed operation) and the LOW speed is not being used. Using MED and LOW settings may reduce the noise but I won't risk messing up the wiring in this cold weather.

robbin
Premium,MVM
join:2000-09-21
Leander, TX
kudos:1

said by lutful:

There is definitely no "draft inducer" fan. I can see the flames through the grill.

Just because you can see flames doesn't mean there is no inducer. What's the model number?

lutful
... of ideas
Premium
join:2005-06-16
Ottawa, ON
kudos:1

The house was built in 1989. YORK's model number label may be hidden behind the original installer's support label - I will check.

However, I know there is no draft inducer fan because I stood and watched the call for heat cycle. The faint pilot flame magically becomes a huge hissing flame. There is no fan noise at all just flames. The blower does not actually turn on until a minute later.

I checked the schematic again and it seems the heat call always runs the blower on HIGH. Only the manual fan call runs on the MED setting.


Bob4
Account deleted

join:2012-07-22
New Jersey
Reviews:
·Optimum Online
reply to lutful

said by lutful:

The label says motor is permanently lubricated.

Unfortunately, the manufacturer probably considers the definition of "permanent" to be 20 years.