Greetings,
I recently bought a 1978 854sqft mobile home. Had a friend check the furnace and we discovered it has a counter clockwise motor (had a clockwise motor in it) and we replaced the fan switch as the fan would not cut in for a long period in the heat cycle.
Now that we have that all done the furnace fan does not cut in on warmup for about 4 minutes into the heat cycle and then half way to tempature the fan cuts out. It heats for a while and then fnally the fan cuts back in. We put in the parts according to the parts list. I am stumped.
Do we need a lower fan switch (its a 100/110 in it)
If I recall the model is an 8690.....
Should I just replace the furnace and be done with it?
1978 Coleman Presidental
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
I'll get the model number for you and the fan switch numbers, etc ASAP - sorry I missed that.
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
Model: 7680
Series: 856
80,000btu
64,000btu output
Series: 856
80,000btu
64,000btu output
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
I'll get the rest today
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
Switch below the transformer:
L15S-2 7680-359
2061L9-718 P3V
Switch above teh transformer:
0934 7710-328
F105-20F 201707 60T82
Transformer:
120V 50 60 C4
BE11246 KIF 45
7660A350
This transformer hums, not sure it that is normal.
Switch at fan:
B3T T.O.T L83 T-O
This one was hard to read and the paper on the back was worn off.
Hope this is all you need sir!
Thank you so much
L15S-2 7680-359
2061L9-718 P3V
Switch above teh transformer:
0934 7710-328
F105-20F 201707 60T82
Transformer:
120V 50 60 C4
BE11246 KIF 45
7660A350
This transformer hums, not sure it that is normal.
Switch at fan:
B3T T.O.T L83 T-O
This one was hard to read and the paper on the back was worn off.
Hope this is all you need sir!
Thank you so much
Make sure the burner tube and burner orifice/spud behind the gas valve are all clean and clear.
Spiders like to build webs in the orifice/spud.
Then if it is still cutting on/off, test across the limit switch to see if it is opening/closing with each off/on sequence.
Thanks,
Robert
Spiders like to build webs in the orifice/spud.
Then if it is still cutting on/off, test across the limit switch to see if it is opening/closing with each off/on sequence.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
OK. Will check the above.
The transformer humming is normal?
Thank you Robert.
The transformer humming is normal?
Thank you Robert.
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
Actually if you can link waht I need to buy - I'll replace all the switches.
Even teh transformer as well.
Even teh transformer as well.
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
Well I want to repalce the old tired furnace with a new unit - I am looking at a Miller M1MB070ABW A/C Ready. Its a tuch smaller at 70,000 BTU compared to the 1978 Coleman Presidental I have now. I take it would be enough to heat the place? (Sealed cieling tile joints, New windows, doors, etc... but not re-insulated)
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
so waht I am saying is I want to keep the old one running well until I get a new one installed! LOL
Hi,
You're very welcome. No, transformer humming is usually a sign it is heading out. Some hum longer than others, but I always recommend replacing when it starts to hum.
Make sure all connections are tight and clean and you have correct voltage (120vac primary-line/24vac secondary-load). If so, it should not hum. Keep it though, could be used in an emergency sometime.
Thanks,
Robert
You're very welcome. No, transformer humming is usually a sign it is heading out. Some hum longer than others, but I always recommend replacing when it starts to hum.
Make sure all connections are tight and clean and you have correct voltage (120vac primary-line/24vac secondary-load). If so, it should not hum. Keep it though, could be used in an emergency sometime.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
Ah sorry must be the black tea I am drinking! LOL
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- Posts: 14
- Joined: Fri Oct 15, 2010 9:06 am
- Location: Alberta
BTW - I redid the connections when I bought the place - they needed a redo.
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