I'm trying to come to some base line for the proper sequence of operation on this old girl. It's hard to get info on the net as to proper sequence timing. It varies so much from furnace to furnace depending on too many factors. So I decided to come here and describe the furnace and run the numbers.
(images are pretty large so I just linked them)
BARD. Bard Mfg, Bryan, OH.
Model. NB 115
Natural Gas Conversion Unit
Furnace probably about 60 yrs old. Oil burner converted to nat gas 40 years ago. Still seems to do the job quite well.
First things first. Think i need to replace the blower motor. Been popping it's circuit breaker lately, unable to start. Hums for ten seconds, quits, tries again, quits, tries again and takes off. Motor is a bit hot to the touch after this. I installed the motor brand new about seven years ago.
Dayton 1/4 hp split phase sleeve bearing. Appears to be still in brand new condition. Disassembled the starter contact and contacts were really badly corroded with flash. Removed this flash down to bare metal. Ran perfectly for a week and started occasionally doing it's humming on start and circuit breaker mischief. Don't know what's the problem. Is 1/4 hp too small for a blower this size? Perhaps the starter windings are a bit too fatigued anymore after all the humming and circuit breaking and I should just break down and get a new motor.
This looks like a realllly good candidate if I can get it locally for about 140 dollars (avg list on the net).
Twice as efficient as this Dayton. Capacitor start. Ball bearings. What's not to like? Should I trade up to the 1/3hp version?
Now to the gist of my thread title. I sat down with a watch and timed the sequence through four cycles. Averaged them.
It's 32F outdoors.
It's 65F indoors.
Thermostat is set to 60F.
Ignition of burner begins and continues for 2:30
After burner goes out there is a pause for 2:25
Blower kicks in and runs for 3:45
Blower stops and system rests for 5:05 before burner again ignites.
Approx 14min total cycle time.
The burner is never on during blower operation.
Any of this sound amiss?
Thanks so much for reading any part of this. And hearty thanks and congratulations to anyone steadfast enough to have plodded on to the end. Hope I can get this baby tuned up.