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Old 08-25-2010, 10:55 AM   #1
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1975 31' Excella 500
Beggs , Oklahoma
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Armstrong AC

I just got a vintage 1975 Excell 500... can anyone tell me if the ac had a wall thermostat... got some wires by my heater thermostat and the ac compressor won't kick on... Thanks...
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Old 08-25-2010, 11:27 AM   #2
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1978 28' Ambassador
Kenton , Ohio
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Yes, there should be an AC thermostat there.
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Old 08-25-2010, 11:43 AM   #3
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1975 31' Excella 500
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Thanks... That gives us a start... we checked the freon and it seems to be full.. would hate to trash it and it just be a simple fix...
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Old 08-25-2010, 12:07 PM   #4
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in my 73 excella furnace thermostat is on roadside partiton wall in rear bedroom between bedroom and closet. The air conditioning thermostat is on the roadside partition wall in living room in front of the fridge.
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Old 08-25-2010, 12:15 PM   #5
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1975 31' Excella 500
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anyone know the color code for the stat??? I have a red.. green and brown wire out the wall.. and can see a black one in the wall... and what kind of stat did anyone use to replace theirs would be a great help...
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Old 08-25-2010, 01:12 PM   #6
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According to manual white goes to teminal marked Y, Black goes to terminal marked G2,Green goes to terminal marked G1 and red goes to terminal marked R. I will check my unit now and see whats what and let you know
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Old 08-25-2010, 01:36 PM   #7
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Here are pics of thermostat. If you like I can scan wiring diagram and post it for you. Just let me know.
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Old 08-25-2010, 04:18 PM   #8
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1975 31' Excella 500
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Quote:
Originally Posted by wasagachris View Post
Here are pics of thermostat. If you like I can scan wiring diagram and post it for you. Just let me know.
Yes, please.. that would be great...
Thanks
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Old 08-25-2010, 06:20 PM   #9
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Sorry for the delay I was working on my excella. Welder arrived today and we began welding together new frame rails. Here is the wiring diagram I promised. Two wires connect to the fan speed control ( High and Low). Two wires connect to the cooling Circuit to start compressor etc. It looks like the green wire at G1 is fan High and the black wire at G2 is fan Low.
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Old 08-25-2010, 06:24 PM   #10
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Thermostat(s)

Mine has 2.
One near the front to control the a/c and/or heater and another a little back to control just the a/c.
It would help you a lot to get a manual or even the workshop type.
I believe they are easily available.
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Old 08-31-2010, 12:54 PM   #11
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1975 31' Excella 500
Beggs , Oklahoma
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Can anyone tell me where this black and this white wire hook into the ac, it's a Armstrong 14....
Thanks
Ellen

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Old 08-31-2010, 01:16 PM   #12
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1978 31' Sovereign
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Our '78 Sovreign has two 'stats, one for the A/C and one for the furnace. Thee fan control is a knob on the ceiling unit. Just a slightly off topic note, be sure your electric supply is adequate. I almost junked a perfectly good Armstrong unit because of an inadequate extension cord.
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