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#1
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AC question, what's the circuit board in the compressor cabinet?
AC question, what's the little circuit board in the compressor
cabinet? My friend's AC is a Lennox HS26-311-1P. Its in-house fan goes on, but the air isn't cooled, and the thing outside makes no noise and the fan doesn't spin. (It worked fine all summer and just broke a couple weeks ago, he happily reports.) The thermostat is calling for cooling, and the wires from the furnace where they come into the compressor cabinet have 24 volts across them. Moving along the wires to their destinations, I find the same 24 volts between a black wire at one terminal of the contactor and a black wire at one terminal of a little circuit board next to the contactor. But the contactor hasn't closed the circuit. The board is 2 inches by 2 inches or less and has 3 terminals, in, out, and ground, or maybe common (I forget). It has a few each of diodes, resistors, transistors and a shiny black almost cube, less than 1x1x1 inch, which I think might be a relay. What is the purpose of this board, and what is it called?? When I push in the plastic thing in the middle of the contactor, the compressor goes on and sounds fine. That's not proof yet that the problem is the contactor, is it?? I couldn't figure out the diagram inside the cover, or the manual. For example, it didn't have the circuit board afaict. I think I have to make my own diagram, and find out what is the second terminal for the primary of the contactor. Is it the small black wire on the same side, right next to the other black wire that I've already identified?? A new contactor is about 130 dollars. This one is 11 years old but looks like new. I think if it is broken the odds are 50/50 I can repair it. Should I try?? Thanks |
#2
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AC question, what's the circuit board in the compressor cabinet?
mm wrote:
AC question, what's the little circuit board in the compressor cabinet? My friend's AC is a Lennox HS26-311-1P. Its in-house fan goes on, but the air isn't cooled, and the thing outside makes no noise and the fan doesn't spin. (It worked fine all summer and just broke a couple weeks ago, he happily reports.) The thermostat is calling for cooling, and the wires from the furnace where they come into the compressor cabinet have 24 volts across them. Moving along the wires to their destinations, I find the same 24 volts between a black wire at one terminal of the contactor and a black wire at one terminal of a little circuit board next to the contactor. But the contactor hasn't closed the circuit. The board is 2 inches by 2 inches or less and has 3 terminals, in, out, and ground, or maybe common (I forget). It has a few each of diodes, resistors, transistors and a shiny black almost cube, less than 1x1x1 inch, which I think might be a relay. What is the purpose of this board, and what is it called?? When I push in the plastic thing in the middle of the contactor, the compressor goes on and sounds fine. That's not proof yet that the problem is the contactor, is it?? I couldn't figure out the diagram inside the cover, or the manual. For example, it didn't have the circuit board afaict. I think I have to make my own diagram, and find out what is the second terminal for the primary of the contactor. Is it the small black wire on the same side, right next to the other black wire that I've already identified?? A new contactor is about 130 dollars. This one is 11 years old but looks like new. I think if it is broken the odds are 50/50 I can repair it. Should I try?? Thanks Perhaps it's a timer to prevent short-cycling. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#3
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AC question, what's the circuit board in the compressor cabinet?
mm writes:
A new contactor is about 130 dollars. Nope. About $20 on grainger.com. Your description sounds like you have a short-cycle delay timer. You can bypass it to diagnose that component vs the contactor. |
#4
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AC question, what's the circuit board in the compressor cabinet?
The board is a delay timer. So that the pressures in the system have
time to equalize before the compressor comes back on. Sounds like you're over your head, here. Might be time to call an AC service guy. -- Christopher A. Young You can't shout down a troll. You have to starve them. .. "mm" wrote in message ... AC question, what's the little circuit board in the compressor cabinet? My friend's AC is a Lennox HS26-311-1P. Its in-house fan goes on, but the air isn't cooled, and the thing outside makes no noise and the fan doesn't spin. (It worked fine all summer and just broke a couple weeks ago, he happily reports.) The thermostat is calling for cooling, and the wires from the furnace where they come into the compressor cabinet have 24 volts across them. Moving along the wires to their destinations, I find the same 24 volts between a black wire at one terminal of the contactor and a black wire at one terminal of a little circuit board next to the contactor. But the contactor hasn't closed the circuit. The board is 2 inches by 2 inches or less and has 3 terminals, in, out, and ground, or maybe common (I forget). It has a few each of diodes, resistors, transistors and a shiny black almost cube, less than 1x1x1 inch, which I think might be a relay. What is the purpose of this board, and what is it called?? When I push in the plastic thing in the middle of the contactor, the compressor goes on and sounds fine. That's not proof yet that the problem is the contactor, is it?? I couldn't figure out the diagram inside the cover, or the manual. For example, it didn't have the circuit board afaict. I think I have to make my own diagram, and find out what is the second terminal for the primary of the contactor. Is it the small black wire on the same side, right next to the other black wire that I've already identified?? A new contactor is about 130 dollars. This one is 11 years old but looks like new. I think if it is broken the odds are 50/50 I can repair it. Should I try?? Thanks |
#5
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AC question, what's the circuit board in the compressor cabinet?
On Sun, 17 Sep 2006 20:22:42 -0500, Richard J Kinch
wrote: mm writes: A new contactor is about 130 dollars. Nope. About $20 on grainger.com. Wow. I thought 130 was a lot. Your description sounds like you have a short-cycle delay timer. You can bypass it to diagnose that component vs the contactor. To give myself a pat on the back, I thought of that too, but wasn't at all sure. I'm in pretty good shape now, but I won't work on it again until next Sunday. |
#6
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AC question, what's the circuit board in the compressor cabinet?
On Mon, 18 Sep 2006 02:25:37 GMT, "Stormin Mormon"
wrote: The board is a delay timer. So that the pressures in the system have time to equalize before the compressor comes back on. Sounds like you're over your head, here. Might be time to call an AC service guy. Well, I was in over my head, but you answered my question for me! |
#7
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AC question, what's the circuit board in the compressor cabinet?
check to see if the contactor has voltage across the coil, if it does,
then it's the contactor. otherwise it's you little mystery board. Empressess #124457 The best Games a href=http://www.gamestotal.com/Multiplayer Online Games/a a href=http://www.gamestotal.com/Strategy Games/abra href=http://uc.gamestotal.com/Unification Wars/a - a href=http://uc.gamestotal.com/Massive Multiplayer Online Games/abra href=http://gc.gamestotal.com/Galactic Conquest/a - a href=http://gc.gamestotal.com/Strategy Games/abra href=http://www.stephenyong.com/runescape.htmRunescape/abra href=http://www.stephenyong.com/kingsofchaos.htmKings of chaos/abr mm wrote: AC question, what's the little circuit board in the compressor cabinet? My friend's AC is a Lennox HS26-311-1P. Its in-house fan goes on, but the air isn't cooled, and the thing outside makes no noise and the fan doesn't spin. (It worked fine all summer and just broke a couple weeks ago, he happily reports.) The thermostat is calling for cooling, and the wires from the furnace where they come into the compressor cabinet have 24 volts across them. Moving along the wires to their destinations, I find the same 24 volts between a black wire at one terminal of the contactor and a black wire at one terminal of a little circuit board next to the contactor. But the contactor hasn't closed the circuit. The board is 2 inches by 2 inches or less and has 3 terminals, in, out, and ground, or maybe common (I forget). It has a few each of diodes, resistors, transistors and a shiny black almost cube, less than 1x1x1 inch, which I think might be a relay. What is the purpose of this board, and what is it called?? When I push in the plastic thing in the middle of the contactor, the compressor goes on and sounds fine. That's not proof yet that the problem is the contactor, is it?? I couldn't figure out the diagram inside the cover, or the manual. For example, it didn't have the circuit board afaict. I think I have to make my own diagram, and find out what is the second terminal for the primary of the contactor. Is it the small black wire on the same side, right next to the other black wire that I've already identified?? A new contactor is about 130 dollars. This one is 11 years old but looks like new. I think if it is broken the odds are 50/50 I can repair it. Should I try?? Thanks |
#8
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AC question, what's the circuit board in the compressor cabinet?
However, a couple questions you didn't ask, and I didn't answer.
-- Christopher A. Young You can't shout down a troll. You have to starve them. .. "mm" wrote in message ... On Mon, 18 Sep 2006 02:25:37 GMT, "Stormin Mormon" wrote: The board is a delay timer. So that the pressures in the system have time to equalize before the compressor comes back on. Sounds like you're over your head, here. Might be time to call an AC service guy. Well, I was in over my head, but you answered my question for me! |
#9
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AC question, what's the circuit board in the compressor cabinet?
"Stormin Mormon" wrote in message ... However, a couple questions you didn't ask, and I didn't answer. Like "Why is the storming Moron such an idiot?" Christopher A. Young You can't shout down a troll. You have to starve them. . "mm" wrote in message ... On Mon, 18 Sep 2006 02:25:37 GMT, "Stormin Mormon" wrote: The board is a delay timer. So that the pressures in the system have time to equalize before the compressor comes back on. Sounds like you're over your head, here. Might be time to call an AC service guy. Well, I was in over my head, but you answered my question for me! |
#10
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AC question, what's the circuit board in the compressor cabinet?
Stormin Mormon posted for all of us...
Sounds like you're over your head, here. Might be time to call an AC service guy. Which would NOT be Chris Young alias Stumped Moron -- Tekkie "There's no such thing as a tool I don't need." |
#11
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AC question, what's the circuit board in the compressor cabinet?
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#12
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AC question, what's the circuit board in the compressor cabinet?
The Stucco site is not a help forum, it's an *advertising* forum that invades real forums (like "alt.home.repair", part of "usenet") parasitically in order to generate free advertising for itself, which continually advances its search engine placement, thereby increasing its own revenue through its click- through advertising commissions. So the first thing you should do is write them an email and tell them to quit spamming. Then try to find your way here through proper channels. Please do a google search on "Usenet" and post the regular way. -- Christopher A. Young Learn more about Jesus www.lds.org .. "Northman" wrote in message roups.com... Northman had written this in response to |
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