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Old 12-10-2012, 09:38 PM   #16
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Furnace not getting past 76 degrees


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Originally Posted by Technow View Post
You can't have a furnace raise temp to 90 because that will probably trip the limit.

Are you just making stuff up?....

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Old 12-10-2012, 09:46 PM   #17
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Furnace not getting past 76 degrees


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70 is standard design conditions for any heating system.

In the field, hooked to real ductwork, many furnaces are at their temperature rise limits at 70. try to go above 70 and now you are pushing the HI Temp limit and it starts cycling off.

What is the temperature rise of the furnace? You can't have a furnace raise temp to 90 because that will probably trip the limit.
Well if above 70 is pushing the high temp limit, then you have a furnace that has low air flow.
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Old 12-10-2012, 09:48 PM   #18
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Furnace not getting past 76 degrees


Did I miss something Sherlock? Yeah low airflow temp rise pushes the limit....did I miss somewhere where the actual temp rise was reported?
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Old 12-10-2012, 09:52 PM   #19
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Furnace not getting past 76 degrees


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Did I miss something Sherlock? Yeah low airflow temp rise pushes the limit....did I miss somewhere where the actual temp rise was reported?
Your giving off the impression that most furnaces can't heat a home above 70. That thats just to much to want from a furnace. And its not.

The OP is asking for solutions. Things he can check or try. Not reasons why the tenants should make due with only 70.
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Old 12-10-2012, 09:55 PM   #20
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Furnace not getting past 76 degrees


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Your giving off the impression that most furnaces can't heat a home above 70. That thats just to much to want from a furnace. And its not.

The OP is asking for solutions. Things he can check or try. Not reasons why the tenants should make due with only 70.
Was not giving a reason to keep the temp at 70 just the design reason for it and why the ductwork might be keeping it from rising above.
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Old 12-10-2012, 10:04 PM   #21
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Furnace not getting past 76 degrees


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Was not giving a reason to keep the temp at 70 just the design reason for it and why the ductwork might be keeping it from rising above.
Lets try giving him ways to get the furnace to be able to heat the house above 76. Thats what he came here for.
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Old 12-11-2012, 01:34 AM   #22
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Furnace not getting past 76 degrees


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Was anything done with the furnace?

1. was the furnace motor change ? It could be spinning backwards and/or not throwing that much air.
2. Was the anticipator ever checked or cycle setting depending on the stat, ever ajusted for your furnace.
3. If a mertcury style thermostat is it level.
4. Is the gas pressure on the manifold set correctly usually around 3.5"w.c. pressure

I would suugest you might need to call a HVAC guy he can check these things out.


These are some Ideas for you to check. Hope this helped.
Stupid comments.Motor spinning backwards.??
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Old 12-11-2012, 01:49 AM   #23
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Furnace not getting past 76 degrees


@Technow
The temp rise of many older furnaces is 70 - 100 F but I doubt that they'd still be running in an IL. climate.

@bobelectric
Same thing with older furnaces. I've dealt with hot furnaces caused by motors spinning against the cage design direction, that were serviced un noticed for years by other companys.
The same with motors that were spinning in the right direction but with the cage in backwards.

Last edited by how; 12-11-2012 at 01:58 AM.
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Old 12-11-2012, 06:15 AM   #24
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Furnace not getting past 76 degrees


I had just installed a new 20 kw goodman in a kitchen and the temp is only 75* comming out the register not enough temp rise to worm up this small kitchen. All electric checks fine but heatstrip may be defective it is like running a 10kw in there so you may want to have that checked also.
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Old 12-11-2012, 07:44 AM   #25
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Furnace not getting past 76 degrees


If we have not chased the original poster away...


Check that they did not put something over the cold air return. Had a tenant do that once (plastic bag) because they felt cold air blowing there. It took a while to explain to them that it was not blowing out, but rather it was being drawn into the return. A blocked return will cause too low of air flow which will cause the burner to shut off on high limit the same way a clogged air filter will.
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Old 12-11-2012, 05:32 PM   #26
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Furnace not getting past 76 degrees


bobelectric
why is a motor running conterclockwise stupid?

If a motor was changed and the direction of air flow is opposite the way the squirrle cage should spin, you are not scooping the air to blow it througout the house.
When a motor is change you need to check to ensure that the direction is clockwise or counterclockwise.

if the direction is wrong then you will need to change the direction the motor spins. Lots of times when a home owner or friend of the owner changes a motor they don't realize this and it leads to poor air circulation.

I'm not trying to argue with you maybe I was misunderstood by saying backwords...
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Old 12-11-2012, 06:29 PM   #27
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Furnace not getting past 76 degrees


The original poster said that the furnace is reaching 76, and it stops putting out heat, not 70, so when did 70 come into play? Don't you really need to know the furnace output, how big an area the furnace is heating, how large the ductwork is, whether they have single pane or insulated glass, and a whole lot of other things before making this call? The way the original furnace guy said "Its Fine" may indicate that he knows this particular furnace and what it is capable of, and it is not capable of producing a tropical climate in
Chi-Town. They don't call it the windy city for nothing, and its the home of the Hawk. I just wonder how these same tenants were OK with it last year, but this year they want more heat. I keep going back to the basement guy, and whether this is a new living situation. It would get cold as hell down there with no vents.
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Old 12-11-2012, 07:56 PM   #28
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Furnace not getting past 76 degrees


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They don't call it the windy city for nothing



Yeah, they don't....but it appears that you haven't a clue as to why it's called that.
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Old 12-11-2012, 08:37 PM   #29
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Furnace not getting past 76 degrees


What is it with you HVAC guys? If all you can do is issue snide remarks dont bother, most of the people on these forums can read at least as good as you can. Go kick your dog, he's used to it and he cant hit back.
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Old 12-11-2012, 09:03 PM   #30
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Furnace not getting past 76 degrees


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Yeah, they don't....but it appears that you haven't a clue as to why it's called that.
Actually I am kind of curious why its called that since I grew up there before I moved to Richmond. Why don't you enlighten us?

The problem with the 70 degrees is my fault.

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Last edited by beenthere; 12-12-2012 at 05:29 AM. Reason: removed uncalled for comment
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