Electric Furnace 2 of 3 elements working
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Electric Furnace 2 of 3 elements working
I have an Intertherm electric furnace and I replaced the heat sequencers, relay, and both limit switches on. The bottom element runs on one single pole limit swith and the top two elements run on a 2 pole limit switch. I checked the continuity on the elements as well as the ohms and all three have continuity and read about 10 ohms each. After doing all this nothing worked only the blower but no hot air. After a closer look at the system I saw that the white wire coming from the thermostat was cut off. So, I connected it and Voila, it worked, well only two elements worked. The one on the single pole limit switch workes as well as one of the 2 that are connected to the 2 pole limit switch. Could anybody give me some insight as to what could be the problem?
#2
Welcome to the forums.
Way to complicated to offer guesses. We need a model number of the air handler and the heating kit or a few pictures.... or both. How-to-insert-pictures
The limit switches are just for overheat protection.
It's the sequencers that do the switching of elements.
Way to complicated to offer guesses. We need a model number of the air handler and the heating kit or a few pictures.... or both. How-to-insert-pictures
The limit switches are just for overheat protection.
It's the sequencers that do the switching of elements.
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Yes, and I installed the sequencers yesterday as well, brand new. Does the 2 pole limit switch open or close and activates one elementa at a time or should both elements be active at tje same time, of course when the sequencer tells it to? Is it possible that it would just take longer for the sequencer to send the signal? I did wait about 10 minutes and the 3rd didnt turn on.
#5
Make sure you have a good manual and diagrams. If not.... download this one.
Diagram on page 15. nordyne_e2_electric_service_manual.pdf
621383 single sequencer - heating: 30-90 seconds on, cooling: 1-30 seconds off
621696 dual sequencer - heating: 1-20 seconds on, cooling: 40-110 seconds off
So the first and element and fan...... and then the second element on in 20 seconds. The third element on in 30 seconds. Your second element is the one that is not working.
TESTING with AC voltmeter
At Sequencers WITHOUT call for heat:
H1/H2 (bottom terminals under M1-M4) = 0 VAC
H3/H4 (bottom terminals under M5/M6) = 0 VAC
M1 to ground = 120 VAC
M2 to ground = 120 VAC
M3 to ground = 120 VAC (second element)
M4 to ground = 120 VAC (second element)
M5 to ground = 120 VAC
M6 to ground = 120 VAC
M1/M2 = 240 VAC (first heat element and fan)
M3/M4 = 240 VAC (second element)
M5/M6 = 240 VAC (third element)
WITH call for heat after 1 - 2 minutes:
H1/H2 = 24-28 VAC
H3/H4 = 24-28 VAC
ALL M to ground should still read 120 VAC
M1/M2 = 0 VAC
M3/M4 = 0 VAC (second element)
M5/M6 = 0 VAC
You should read 240 VAC across the end terminals of each element coil.
You should read 0 VAC across the Limits with call for heat.
At Blower Relay WITH call for heat :
1 & 3 = 0 VAC
5 & 6 = 0 VAC
2 & 4 = 240 VAC
Diagram on page 15. nordyne_e2_electric_service_manual.pdf
621383 single sequencer - heating: 30-90 seconds on, cooling: 1-30 seconds off
621696 dual sequencer - heating: 1-20 seconds on, cooling: 40-110 seconds off
So the first and element and fan...... and then the second element on in 20 seconds. The third element on in 30 seconds. Your second element is the one that is not working.
TESTING with AC voltmeter
At Sequencers WITHOUT call for heat:
H1/H2 (bottom terminals under M1-M4) = 0 VAC
H3/H4 (bottom terminals under M5/M6) = 0 VAC
M1 to ground = 120 VAC
M2 to ground = 120 VAC
M3 to ground = 120 VAC (second element)
M4 to ground = 120 VAC (second element)
M5 to ground = 120 VAC
M6 to ground = 120 VAC
M1/M2 = 240 VAC (first heat element and fan)
M3/M4 = 240 VAC (second element)
M5/M6 = 240 VAC (third element)
WITH call for heat after 1 - 2 minutes:
H1/H2 = 24-28 VAC
H3/H4 = 24-28 VAC
ALL M to ground should still read 120 VAC
M1/M2 = 0 VAC
M3/M4 = 0 VAC (second element)
M5/M6 = 0 VAC
You should read 240 VAC across the end terminals of each element coil.
You should read 0 VAC across the Limits with call for heat.
At Blower Relay WITH call for heat :
1 & 3 = 0 VAC
5 & 6 = 0 VAC
2 & 4 = 240 VAC