Replacement Aquastat Unit

BigMike65

I have an old Peerless gas boiler and am attempting to locate a replacement Aquastat unit. My unit # is: L8024 B D (stamped L8024D 1002 1, 120V, 60CY). Would you let me know what Aquastat unit (number) supersedes the unit I currently have. Thank you.

STEVEusaPA

Can you show a picture of it with the cover off? I think it’s just a high limit aquastat, I know it’s very old.
You’re sure it’s not an 8124?

SuperTech

Upgrade your aquastat to something modern. Get a Hydrolevel 3200. It will probably be less expensive than the replacement Honeywell aquastat. 

EdTheHeaterMan

I cant be sure because I can not find the L8024D1002 in any old Honeywell books I have access to But I would guess that is is replaced by the L8124E because it has the 24 volt burner circuit for gas valves. That would be on a very old gas boiler. was that gas boiler converted from oil to gas with a gas power burner? What is the model number of the Boiler?

Next question is:
Do you make your Domestic hot water (for showers) from that boiler?

That control is for hot water priority. if that tankless coil was abandoned years ago, then you do not need the L8124 type control. You can use the L8148 control that does not have the Hot water feature.

But I would take that a step further and go with the electronic controls that are a little lower price and offer more features. https://www.supplyhouse.com/Hydrolevel-48-3200-Model-3200-Plus-Fuel-Smart-Hydrostat-for-Gas-Boilers-Temperature-Limit-LWCO-Boiler-Reset-Control. This control comes factory preset for no tankless coil operation. If you still have a working tankless coil for hot water, then you can program this control to maintain hot water demand like your old L8024D.

It is also smart thermostat compatible.

@STEVEusaPA here is the L8024D1009 on the left. Remember these? Next to it is the L8124 and the recommended Hydrostat on the right

HVACNUT

Can you post pics of the aquastat (with wiring diagram on inside cover) and gas valve?
The "24" would designate a triple acting aquastat. Is there a tankless coil in the boiler?
The "B" I believe (but not positive) might designate a millivolt burner circuit. You might be limited in what you can replace it with.

What's going on with the existing that you need to replace it?

EdTheHeaterMan

@BigMike65 Your boiler must be about 50 to 60 year old with that aquastat! Might be time to think about a new one based on age alone. Next summer get some prices on replacing it. You will not be happy if it fails in January and you find that no one has the one you want in stock, so you have to settle for second (or third) best!

Next question: What is wrong with the control you have? No power? No pump operation? No burner operation? Is the thermostat working properly? You can test that by placing a jumper wire between T and T to see if the system operates. Do you have one zone (one thermostat) for the whole house or are there separate zones (more than one thermostat)?

BigMike65

From BigMike65, to All that replied to my question. I am not quite sure how to reply to anyone. I am obviously doing something wrong. Help on navigating this discussion site would be greatly appreciated. I sent a prior reply I think but I don't know if it went to one person or everyone and I don't see my reply here. The message I sent was as follows (with add'l. responses).

Okay, here are some photos. One is of the boiler tag with model #G-560-WPCT and serial number 60-16179. Also, current aquastat same as the 1960 photo shown in this feed. To answer some questions, yes the boiler did have the ability to heat hot water for the sink, shower, etc. but is no longer being used for that. Boiler is used to heat the house ONLY which I'm hoping will give me more options for the replacement Aquastat. Yes, the boiler is original to the house (circa 1960's) but still works very well. I'm not kidding myself into thinking it will last forever but right now it is fine otherwise. I did some cleanup on the boiler last fall and I replaced the circulator pump/motor assembly (B&G), the pressure relief valve, the expansion tank and the air bleeders (2) on the system. The system is a single zone, single thermostat setup. I believe the transformer failed on the current unit as I cannot jump the thermostat circuit to turn on the boiler. I did have a power outage yesterday and it came back on "hard" about 30 seconds later which I believe knocked out the transformer. The circulator pump runs if I manually engage the contacts but nothing else works at the moment.
PS: I'm not having any luck attaching the photos from my computer. Any suggestions on how to do this?

BigMike65

Since this reply method seems to be at least getting my message out there, I will continue doing it this way unless someone here can tell me the proper way and how to add photos too. I see that a couple of replies indicated that the L8124E and L8148(?) will work in my case. With regard to the L8148 model, what letter should follow the number? as it does in the L8124E unit. I would rather use either of these two if they will work because I'm not a big fan of electronic units like the 3200 unit also suggested herein. Just my preference unless the 3200 unit would be my only option. Please let me know which one best fits my situation. Thanks to all that replied earlier. Much appreciated.

HVACNUT

@BigMike65, right above the typing area is a row of icons. Simply click on the landscape picture. That will lead you to the photo files on your computer. Click on the photo(s) you want to attach to the post.

We really need to see the diagram from the inside cover of the aquastat. If that aquastat has a millivolt burner circuit, the replacement aquastats mentioned might not work. 

SuperTech

I've replaced the older milivolt aquastats with modern digital aquastats by adding a RIBU1C relay to the burner terminals.

EdTheHeaterMan

Here is my best guess to solve your problem.
#1 you need to determine what gas valve you have. 24 volt or millivolt
Then you get a modern aquastat like the Model 3200-Plus Fuel Smart HydroStat for Gas Boilers
https://www.supplyhouse.com/Hydrolevel-48-3200-Model-3200-Plus-Fuel-Smart-Hydrostat-for-Gas-Boilers-Temperature-Limit-LWCO-Boiler-Reset-Control if you have a 24 volt gas valve

Since you have the millivolt gas valve you need a relay, so you can get the lower cost Model 3250 for oil burner https://www.supplyhouse.com/Hydrolevel-48-3250-Model-3250-Plus-Fuel-Smart-Hydrostat-for-Oil-Boilers-Temperature-Limit-LWCO-Boiler-Reset-Control and a RIB U1C relay https://www.supplyhouse.com/Functional-Devices-RIBU1C-Enclosed-Pilot-Relay-10-Amp-SPDT-w-10-30-Vac-DC-120-Vac-Coil?_br_psugg_q=rib+relay. Here is the diagram for that

HVACNUT

EdTheHeaterMan said:

Here is my best guess to solve your problem. #1 you need to determine what gas valve you have. 24 volt or millivolt Then you get a modern aquastat like the Model 3200-Plus Fuel Smart HydroStat for Gas Boilers https://www.supplyhouse.com/Hydrolevel-48-3200-Model-3200-Plus-Fuel-Smart-Hydrostat-for-Gas-Boilers-Temperature-Limit-LWCO-Boiler-Reset-Control if you have a 24 volt gas valve Since you have the millivolt gas valve you need a relay, so you can get the lower cost Model 3250 for oil burner https://www.supplyhouse.com/Hydrolevel-48-3250-Model-3250-Plus-Fuel-Smart-Hydrostat-for-Oil-Boilers-Temperature-Limit-LWCO-Boiler-Reset-Control and a RIB U1C relay https://www.supplyhouse.com/Functional-Devices-RIBU1C-Enclosed-Pilot-Relay-10-Amp-SPDT-w-10-30-Vac-DC-120-Vac-Coil?_br_psugg_q=rib+relay. Here is the diagram for that

MacGyver is for a pinch, not permanent. Get the correct control.

EdTheHeaterMan

HVACNUT said:

MacGyver is for a pinch, not permanent. Get the correct control.

Does HydroStat make a triple aquastat relay for 750 Millivolt gas valves? I would certainly use it if they make it. What is the model number?

HVACNUT

EdTheHeaterMan said:

MacGyver is for a pinch, not permanent. Get the correct control.

Does HydroStat make a triple aquastat relay for 750 Millivolt gas valves? I would certainly use it if they make it. What is the model number?

Sorry, I wasn't aware Hydro Level absorbed the whole aquastat industry. Did Resideo fold?

EdTheHeaterMan

Does Resideo have an electronic for 750 MV? L7224U1002MV is not in the catalog

And that doesn’t have that LWCO option

Also America Standard doesn’t make that ARCO piggybacking oil burner motor anymore so putting a Beckett or Carlin on 70 year old boiler is OK but using a better controller on a 50 year old boiler is not?

I fail to see the logic