L7224U Universal Electronic Aquastat

Scott Larabee

Personally, I like the L7224U. The sensor comes with it, so you don't need to buy one, and it will mount to the existing well with no problem! I also don't understand why you would need a lot of wiring work? The hookup is pretty much the same. Terminals are in a slightly different location, but unless the old control had just enough wire to reach the terminals, the old wiring should be fine. (Assuming that it is in good condition)

If you have gotten this information from a service tech., then I think it's time to find a new tech.

The control gives you a digital readout of the temp. at the sensor, and has adjustable diff. on both settings. I don't see any reason not to use the new technology!

Scott

Chas_3

L7224U Universal Electronic Aquastat

I need to replace my aquastat. I mucked with the bulb for an hour, its reading 30 degrees too low on the high limit only. The low limit and differentials work fine. Would the L7224U Universal Electronic Aquastat from Honeywell be a good choice vs the L8124 I have now? Its like 50 bucks more and I need a new well and sensor too plus a lot of wiring work.

coalcracker

The warranty replacement rate of the 7224 vs. the 8124 has been about 10 to 1. I think Honeywell didn't do their homework on this one.

lchmb

??

What have you been seeing for issue's with the 7224U? The company I work for has installed alot in the last year without a failure.

Scott Larabee

I too have installed a lot of these, and I have had no failures either! The only issue I know of with them is that if they are wired wrong, there is one error code, which if it happens (I believe the magic number is three times) the control will no longer work. Other than that, I know of no issue with it!

It's like anything else, if it is installed properly, there are no problems! If it's miswired, nothing but problems, but that is not the fault of the control!

Scott

Charlie Masone

I had a lot of experience with R7184 primary controls and the huge return rate. I would often stop at wholesalers and be told that they have a pile of returns. I always carry my tester for these controls and would find that at least 9 out of 10 were good. When I asked who returned them I would be told that it was one or two guys and that most have no problem. I would always try to contact these guys but they are ussualy the un-aproachable sort that will just not return youre call or show up for any training that we make available.

I am told that there are contractors who remove these controls from our burners at the wholesaler and install an R8184G before installing the burner.

The 7224 Aquastat probably falls into the same category as this.

Bill W@Honeywell

L7224...

is only approved for oil. Don't use it on a gas fired appliance. The L7224 is a reliable product, and I also agree with Charlie, we've found 80-90% returned controls were not defective, just a matter of training.

Robert O'Brien

Bill

I recently installed a L7224U as a replacement for a L8124 on a Dunkirk gas boiler with spark ignition.I had never seen a 120V burner circuit on a gas boiler before and checked the wiring diagram,it's designed that way.What difference would it make between an 8124 and a 7224?

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Robert O'Brien

I

have used these exclusively for over 2 years on both installs and replacements and haven't had a bad one yet.I can tell you they don't like even a drop of water.

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ChasMan

Thanks for thie info

I was just going by th tradeline catalog where they list the wells and sensors seperately for each application. I just figured I would have to order those as well. My wires are too short, I know cause I just replaced it all when I rezoned the plumbing and replaced all the valves etc.

I will pick one of these up and give it a whirl.

Bill W@Honeywell

Go to...

www.customer.honeywell.com, scroll down to the bottom right, type in L7224 for a complete wiring & programming PDF file. You also can order form # 69-1957 from Honeywell if you are a ContractorPro member, or have your distributor order it for you.

coalcracker

The return rate of the 7224 is high, but as a percentage of all units, it's still low.

There are some who will replace the 7224 with the old style upon installation.

We don't test them and we don't make judgement calls on them.

I suspect a good percentage of returns is due to improper or no training with the device, but the common reasons given are "No power to B1" (majority), no power to C1, will not maintain low limit, at other reasons.

Bill W@Honeywell

Hi, Robert.

Please drop me an email "off the wall". Thanks!

Chas_2

Got it!

Works like a charm! Scary accurate too. And quiet! No humm and the relays don't SNAP! Nice piece of work in my opinion. Only had it running 12 hours. Time will tell.

Paul Fredricks_3

Hey Bill

I love the 7224. Never had a problem. But if they aren't to be used for gas, how about getting rid of that spade connection terminal on B1. It just gets in the way.