Electric furnace question

about the

heating elements and sequencers.

Below is the result of your feedback form. It was submitted by
on Tuesday, January 2, 2001 at 12:11:19
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Brand: Heil
type: hot air furnace
fuel: electricity
location: basement
Problem: tempurature
problem: uneven, controls
S1: I have a 25 year old Heil 4 element 2 sequencer furnace. it got cold a week ago in the house.
I replaced the fuses to the elemnets and it warmed up. then it never came back on.
the elements would get hot but no blower. I checked the wires to the blower. no power...
through checking the continuity I found a thermal link bad too so I replaced Sequencer number 1 a honeywell r8330c with an r8330d and the thermal link.. this seemed to fix the problem... the blower came back on. and blew hotter air than ever before...but the bottm two element would get hot even when the blower was not supposed to be running... so i replaced that sequencer too... every thing was fine for a few days...but yesteday the furnace did not want to shut off... it kept heating past 75 degrees and the thermostat was set on 68. I shut of the power and inspected the thermosat... I am really not sure what I am looking
for... there is a glass bubble with mercury and it seems to connect two wires if it is hot enough in the house and break the connection when it is too cold??? I cleaned it and kicked the power ack on and it is working fine again...
do you have any idea where my problem(s) might be?
thanks
Abe

I would recommend getting a clamp on ammeter and checking all the elements to see which ones are drawing current. You may have a stuck sequencers or wired it wrong by accident.
One of the sequencers usually turns on the fan too. The sequencers have little electric heaters that activate a thermo-disk. They have a timing sequence that takes so many seconds to turn on and so many to turn off. they are usually staggered so that all the elements don't come on at the same time and shut off at different times.
Scott

Images of electric furnace heating element sequencers.
The specs on the top of the unit indicate the the first stage is "first on last off" and the second stage is "last on and first off"

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