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Old 12-14-2011, 12:19 AM   #61
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Metal duct from furnace leading through a basement hole


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Swap the orange and red lines within the box in your last picture. This will park the orange line somewhere safe and connect the lowest fan speed (red) to the low speed power.
Red and yellow are now connected at Lo. Orange is in Med Lo.

So I'm making all these adjustments but what is the normal operation of an oil furance given all the variables I have provided? I need to know this to identify when we have reached optimal settings. (My goal is energy efficiency.)


Perhaps you can tell me what I should be looking for to know things are working correctly. Feel free to tell me in your own words or maybe you can answer some questions that i'm guessing I should know answers to identify a good working condition.

1. What is the optimal nib settings?

2. What is the optimal operating temperature on the fan limit control I should be looking for?

3. How often should the furnace kick on in say 1 hour for example to maintain the set temp... lets say 66. outside temp 30's

4. What is the optimal setting for the thermostat anticipator. Mine is set to 0.4

5. What is the normal sequence? for example
A. thermostat calls for heat
B. burners fire up
C. fan on temp reached and fan kicks on
D. once set temp reached burners kick off
E. fan continues until reaching off limit nib

(I am noticing at times my burners kick off and then the fan goes on. I'm guessing something must be tripping the thermostat? Perhaps that heating duct in the wall 6 inches from the thermostat? Do you think that would do it? Maybe thats the reason the thermostat is often 1/2 degree off set temp and the furnace cycles every 10 minutes?)

(It's a 1995 insulated house with attic insulated to 10 inches with blow in cellulose over fiberglass batts. The ducts are insulated in the basement so I imagine they would be in the walls too.)

Thank you once again!

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Old 12-14-2011, 12:21 AM   #62
how
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Metal duct from furnace leading through a basement hole


Good info to know..I have worked with tons of older furnaces for years and have never seen a fan/limit with a stop below 200F. How easy was it to move that stop around?
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Old 12-14-2011, 12:25 AM   #63
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Metal duct from furnace leading through a basement hole


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Good info to know..I have worked with tons of older furnaces for years and have never seen a fan/limit with a stop below 200F. How easy was it to move that stop around?

very easy - Just had to know how to do it. adjusted it while holding it in the air with my own two hands.
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Old 12-14-2011, 12:36 AM   #64
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Metal duct from furnace leading through a basement hole


The reason we've been looking to lower your fan speed is because your description of the furnace operation is one that indicated too low of an operating temp.. Reducing your fan speed was an easy way to raise your operating furnace temp.
What is the operating temp with the red fan speed?
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Old 12-14-2011, 04:04 AM   #65
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Metal duct from furnace leading through a basement hole


No 1 optimal set of run or cycle times for all furnaces, since the outdoor and indoor temp varies run and cycle times. Generally, the blower should not cycle off during a heat call one it has started. Unless the house temp was allowed to drop very low, say to less then 60.
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Old 12-14-2011, 05:38 PM   #66
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Metal duct from furnace leading through a basement hole


I was told 8" insert. Didn't get to talk to the distributor's manager, just one of the counter guys, but they are pretty good about looking things up.

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