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    It was barely visible on the mfgr's tag, but the...

    It was barely visible on the mfgr's tag, but the date-of-manufacture was "5-87"
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    I've never seen an insulated liquid line either. ...

    I've never seen an insulated liquid line either. I've never seen a line-dryer inside either -- does it make much difference where it goes, as long as it's present? The old unit was a 2.5 ton as...
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    Carrier 2.5 ton change out - How's it look?

    Carrier 2.5 ton change-out. My mother's 1987 "oil-drum" Carrier finially stopped working. Sorry for the links -- the "manage attachments" button won't upload anything for some reason. I welcome...
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    Testing 123...

    Testing 123
    http://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc
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    Test imbedding again......

    Test imbedding again...
    https://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc
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    https://drive.google.com/file/d/0B6dZ5_Y6NgVy...

    <img>https://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc</img>
    test imbedding
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    Testing the imbeedding of pictures...

    https://drive.google.com/file/d/0B6dZ5_Y6NgVyQnEzeHZERDhpVkk

    https://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc

    Enjoy....
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    Greetings; I've read that the reason why DIY is...

    Greetings; I've read that the reason why DIY is frowned upon, is mainly to avoid liability. This totally makes sense. For anyone who's willing to offer a few words of advice, how do we take a...
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    Thanks for the info -- If this doesn't work, I...

    Thanks for the info -- If this doesn't work, I promise to bring an HVAC person in to work on this --- I'd have no choice...

    -A
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    According to the documentation that was left...

    According to the documentation that was left behind with the AH, I removed the jumper between R and BK, then installed the Humid. controller there. I also jumped R and O. This is not correct? ...
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    OP here: Welp, I connected the Humidity...

    OP here: Welp, I connected the Humidity Controller according to the documentation, but it doesn't alter the behaviour of the AH at all. It doesn't spin down to low-fan while the tstat is calling...
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    OP here: I see. My tech documentation on the...

    OP here: I see. My tech documentation on the AH, says that "Humidistat will be installed between terminals R and BK - Also note that terminals R and O must be shorted for proper blower operation"....
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    OP here: Thanks -- so the only thing a...

    OP here: Thanks -- so the only thing a dehumidistat will do, is to force low-fan-speed when there's already an existing call for cooling? Will it turn on the compressor along with low-fan-speed...
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    How does dehumidification work with my AH?

    Greetings;

    With the technical docs that were left behind from my installer, I see that a humidistat can be installed to work with my system. It's not a seperate unit, but some function of the AH...
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    The one transformer in the A/C AH has a 3A fuse...

    The one transformer in the A/C AH has a 3A fuse on the 24v side, and the transformer for the heat (installed in 1963) has no fuse on the 24v side, except for the 15A breaker on the Primary (120VAC)...
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    FIXED! (I can't figure out why though, since it...

    FIXED! (I can't figure out why though, since it worked perfectly for 4 years then stopped..) I re-wired the two zone-valves, transformer, and tstats according to a diagram I found on Taco's...
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    OK - zone valve is rated for 24v and .9A. I...

    OK - zone valve is rated for 24v and .9A. I compared upstairs zone-valve, which works perfectly.

    Upstairs:
    25.1v coming from transformer
    dips to 21v when valve is opening, and is pulls .91A

    ...
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    'Fried' was my word I guess... What I've...

    'Fried' was my word I guess... What I've diagnosed, is that when the Tstat closes its relay, which should send 24v to the zone-valve; there's no voltage. If I bridge R and W on the Tstat, voltage...
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    Question: The "R" and "Rc" terminals on a Tstat...

    Question: The "R" and "Rc" terminals on a Tstat are where the 'hot' line from the transformer connects. Rc is power-for-cooling. Does this mean "R" is the power for heat? Is this how a Tstat...
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    the Tstat for downstairs is the one that died. ...

    the Tstat for downstairs is the one that died. The upstairs Tstat is a Honeywell item from ~2002 (programable), but it doesn't go 'click' when a call for heat is made. This older Tstat is working...
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    Fuse is still intact - I still see 28VAC at the...

    Fuse is still intact - I still see 28VAC at the Tstat. I could swap the two zone valves to see if the problem follows the valve - but that's an expensive fix; because it fries an $80 Tstat.

    For...
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    There's a 5A automotive-type fuse that powers the...

    There's a 5A automotive-type fuse that powers the transformer. I think I left something out -- when the Tstat calls for heat, and closes the ckt for heating, the current routes thru one of those...
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    Burning up a Tstat??

    Can I get a professional opinion? I've been running just fine for 4 years with a Honeywell CT3500 Tstat. Just before Christmas my furnace stopped coming on. I traced this to the fact that the...
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    The old boiler (from pics of the nameplate) ...

    The old boiler (from pics of the nameplate)

    Federal Boiler model GFS-17. AGA input 175K AGA output 140K net output 123K The house was built in late '64, into '65. Boiler was working fine --...
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    Question: That smaller horizontally-mounted...

    Question: That smaller horizontally-mounted expansion tank has wording on it, that says it's for domestic hot water expansion. BUT: The tank is definitly on the cold-water input to the tank. Do...
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