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scottie9656 11-06-2011 01:11 PM

tempstar problems
 
I have a tempstar PA5542AK with heat strip AMMK17AHb2 that I can not get the heat srips to come in.
I get 24 volts to the sequencers and 110volts from them to the strips and through the limiters.
I checked the continuty of the strips which are good.
I checked the continuty of both sequencers with 24 volts to the coil which checked out.
I disconnected all wires from both sequencers and checked the ohms. the 2 stack was 58 ohms and the three stack was 78.

Funny thing is I can start a heat cycle with the fan unplugged and the strips will power up and run fine if i plug the fan back up before the limiters trip.

yuri 11-06-2011 01:39 PM

You should have 220-240 volts coming into the unit ACROSS both wires and do not test each to ground. Lots of guys get fooled when they get 110 to ground which is NOT a real 220. Same thing when testing the elements. Need to have 220 across them and not test to ground. Same thing happens when testing AC contactors. If you only have 110 then one of your main fuses is blown or breaker tripped. You should draw around 18-20 amps on a 5kw element with 220/240. Will still work with 110 but produce half the heat. Lectric furnaces can be tricky to troubleshoot.:yes:

scottie9656 11-06-2011 02:20 PM

I do have 220 volts at the elements pulling 20 amps when I get them to come on.

yuri 11-06-2011 04:01 PM

If it has a small circuit board or relay interlocked with the sequencers to turn the fan on with the AC that may be acting up and causing a problem.

scottie9656 11-06-2011 04:41 PM

Is there any way to test the circuit board? How about the test on the sequencers? I read I should not be getting more than 20 ohms thru the coils on the sequencers.

yuri 11-06-2011 05:13 PM

Sounds like you are getting some sort of backfeed and more than 1 motor winding or circuit in the 24 volt loop energized . A sequencer does not need to be tested that way. It either closes or opens. Nothing more than a warp switch. Post a pic of the electrical diagram and maybe we can read it and help more.

scottie9656 11-07-2011 07:54 AM

tempstar problems
 
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