Minneapolis Honeywell Model 77

Sittingrabbit

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Oct 20, 2020
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Hello all,

I saw there was a thread made 16 years ago, but I thought I'd start a new one since I have one of these now.

Does it look complete? I was told both thermostat and clock work (will test clock later today). Does anyone have any information on it? I know it was popular back in the day. Any instructions, box, anything? My plan is to ditch the digital one my house had when we moved in and replace it with this one (bottom picture, house notes to contractor). My house has a boiler, hot water circulation pump, and radiators all from 1928 through the early 50s.

According to my wife, my house is a museum (brick 1928 Georgian colonial revival 3 story). Every room, every appliance, all furniture, all original, even the furnace and circulation pump. All paint colors are appropriate. My goal is to get the few remaining "modern" things that were put in replaced with original.

Any help would greatly be appreciated!

Jason

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R. Croswell

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I'm guessing this is closer to the 1930's than the 1050's. You may need to periodically clean the electrical contacts and make sure they are not pitted, otherwise it should work. Don't expect the on-off differential to be as close, or the temperature as accurate as a modern digital thermostat, but with big hot water radiators that shouldn't matter. In 1928 I would expect most boilers to be coal fired. Coal to oil conversions were common during the 1940's and 50's (and sometimes to natural gas). Keeping everything original in a house this old sounds very interesting. Most oil burners and boilers from this period were fuel hogs, but more importantly, most lack the safety features that most codes now require.

Perhaps we could see some pictures of your antique heating system and appliances? My house was built in 1950, but I don't replace anything without a good reason. My boiler dates to the late 1960's but I have updated the safety controls. I have a 1933 toastmaster toaster that uses a ticking clock to "pop up" the toast. Everyone says why don't you replace that old thing? Well, I'm an old thing and I don't want to be replaced and my toaster still works just fine thank you.

RC
 

R. Croswell

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Here's a few
I suspect that this American Standard gas boiler is a replacement for some old monster. Looks like 1950's or 60's to me, but there should be a date on it someplace. Is the white pipe covering asbestos or fiberglass? In the 50's it could be either, earlier it would be asbestos. I would suggest that you not place anything that will burn close to the front of around that boiler. Under certain conditions there can be flame "roll out". That happens if the flu passages become obstructed, ignition is delayed, or the fuel/air ratio isn't correct. Newer units have flame roll out shut off devices, but that's after the fact. It's probably cast iron and may last as long as the house! I hope you have it serviced annually including CO level in the flu gases.

The white plastic jacketed wire I see in the pictures wasn't used until the 1950's but generally does not meet code in most areas for power wiring on or around boilers, which should be metal jacketed cable typically called BX. An older installation would likely have been wired with metal jacketed cable. The installation does not appear to have a supply water back flow preventer device that most codes require today, and a low water shutoff device which is required by some codes and insurance companies.

RC
 

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