Fan Delay Taking Too Long to Start in Cold

[JRC3]

I have a Hamilton Products 45k direct vent heater and when it gets below 40 or so the fan delay takes too long to start the blower fan. I know it will take longer when it's cold, as it should, but it's taking over three minutes and often trips the limit control. Not to mention it bakes the heat exchanger.

Basically it's just like a Hot Dawg and other brands.

Does anyone have this problem with their direct vent heater? When it's above 40 degrees or so the fan comes on in about 30 seconds as it should. Once the garage is up to temp the delay functions as it should with every call for heat. When the call for heat ends, the burner shuts off and the fan shuts off in about 15 seconds, that seems to be the same no matter the temp.

Once the heater gets a call for heat and the burner ignites the fan delay gets power as it should. I went ahead hooked up an external 24v transformer to power the fan delay only just in case I was maybe having an amperage problem or something with the on board transformer, no change.

I don't think the delay is necessarily bad but when it's cold it is just taking too long to heat up. Am I on the right track or is it defective? I'm considering just putting a clamp on incandescent light directly under the relay to keep it warmer or instal a manual switch to throw on the first cycle. I hate to order another fan delay just to have it do the same thing.

 

[dfiler2]

I would replace the heat sequencer you have shown, they are relatively inexpensive, they work by having a small heater below a snap disk and they get weak. I got one from amazon, you just need to find the match for what you have. There should be some numbers like H1-*** C1-***, voltage and the stage #'s on the existing one.

http://www.amazon.com/s/ref=nb_sb_n...eywords=heat sequencer&sprefix=heat+seq,tools

 

[JCByrd24]

On my 30K Modine the fan comes on within seconds. I've assumed because of this it's timed not heat related like yours and I just looked at the wiring diagram to confirm. As a temp solution you could just jumper the delay as like I said mine is basically on whenever the heater is on. I'm assuming the wiring is not hot when the heater isn't running though I suppose it could be hot all the time and be controlled solely by the delay in which case that wouldn't work, I doubt that's the case though.

 

[JRC3]

I would replace the heat sequencer you have shown, they are relatively inexpensive, they work by having a small heater below a snap disk and they get weak. I got one from amazon, you just need to find the match for what you have. There should be some numbers like H1-*** C1-***, voltage and the stage #'s on the existing one.

http://www.amazon.com/s/ref=nb_sb_n...eywords=heat sequencer&sprefix=heat+seq,tools

Thanks for the advice on checking the numbers for the delay times, I didn't know it was that easy to figure out and I searched before. The stock time is on/30-110 seconds and off/5-45 seconds. I found some rated on/30-90 and off/1-45 and imagine that should be close enough. These are about 1/3 the price I saw on the manufacturer site and for that much I will just replace it.

Thanks!

On my 30K Modine the fan comes on within seconds. I've assumed because of this it's timed not heat related like yours and I just looked at the wiring diagram to confirm. As a temp solution you could just jumper the delay as like I said mine is basically on whenever the heater is on. I'm assuming the wiring is not hot when the heater isn't running though I suppose it could be hot all the time and be controlled solely by the delay in which case that wouldn't work, I doubt that's the case though.

I'll probably will jump it with a switch until the new sequencer comes. Your Modine might have a newer style with the delay built into the main board.