Correct vaporstat replacement for Pressuretrol

[Deleted User]

The -J1009 and -J1017 have an SPDT switch that switches R to B or R, the same as the L608 mercury vaporstat. Ignore the W terminal. Just pretend it's not there. Treat it as though it were an SPST switch, R to B only, break on rise, make on fall. The -J1025 and -J1033 are direct replacements for the L408B, none of which have any place in your application.

I'm a little surprised that the PA404 has 24V listed. I can't think of a reason that the L408J wouldn't work at 24V, but I wouldn't do it since it's not a listed application. I think that these controls are better placed on the line voltage side, anyway, in series with the low water cut-out. That's a better way to go than adding an extra relay.

Mark

mel rowe

Correct vaporstat replacement for Pressuretrol

Over the weekend I find that my 18 yr. old Pressuretrol has died and I want to replace with a Vaporstat. A Wallie had previously given a link on Vaporstats. It was http://customer.honeywell.com/Techlit/pdf/65-0000s/65-0287.pdf On that link there are 4 different part numbers shown. Can someone please tell me which is the correct part no. for a direct swap for a Honeywell PA404A (additive differential) Pressuretrol?

Steamhead (in transit)

They don't tell you which is which

and there's nothing else on the Honeywell site that does. You might have to call your supplier.

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mel rowe

Thanks for looking at it, Steamhead. I'll probably just go ahead and try to reach someone at Honeywell tomorrow.

Unknown

Is This,

what you were looking for Mel?

Steamhead (in transit)

That's

the discontinued mercury-switch version.

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Wethead7

That miight be why

We have been unable to get one from the supply house.

So what is the current model??

Mike

eburke_49

Don't know if this site will help. http://dticorp.net/catalog/honeywell-kgcm2-p-1137.html?osCsid=f73dff23c0acf983fa32347c8014739b
I purchased one recently and have it set to cut in of 2
with cut out of 3. Does this mean I running on 3 ounces of pressure? Are the mercury vaporstats legal in Massachusetts? My boiler will run for the same amount of time without the hissing from the vents that I was getting with the pressuretrol. Is this because the vaporstat downfires the burner? ed

Dave_4

A number of questions here. The way it looks to me is that the Vaporstat I need is like the old L408A Spst style, which breaks on rise to setpoint and makes on fall to setpoint minus the diff. This has been discontinued due to the Mercury switch. The new style uses microswitches. I'm still trying to find out which of the new L408J series is equivalent to the above L408A model. To eburke, the mercury type vaporstats being sold must be leftover stock. Don't know anything about legality in Mass. Since already bought and installed---should be no problem, unless it is a Code issue during resale of house. As far as the setting, I seem to remember recommendations that the low limit should be set at whatever it takes to get steam to the radiator most disstant from the boiler and the differential should be about 4 oz. The vaporstat doesn't downfire the boiler, it shuts off the burner at the cutoff setpoint and turns it back on when it falls to the cut-in pressure. Hope that helps.

[Deleted User]

L408J

Mel, according to that PDF, you want L408J1009 or L408J1017, and you want to use terminals R and B. The difference between the two is that one has a 1psi main scale and the other has a 4psi main scale. If you don't need more than 1psi for cut-out, you might want the lower-range model to give you more precision and to prevent a future knucklehead from turning the pressure up too high. A Honeywell distributor, whom you need to order one of these through anyway, will be able to help you figure out which is which.

Dave_4

Thanks Mark, that's where I came out also. Although it seems that the Vaportrol should only need a Spst switch, and the internal wiring diagrams for the old L408A Vaportrol look the same as the new L408J1025/1033, the comments under the diagram read differently, so I'm not really sure if the newer version breaks at the setpoint and makes at the cut-in or not. So, unless I find out differently from Honeywell, I plan to buy the 1009. These also run on line voltage, rather than 24 volts, like the Pressuretrol, so I am going to have to add a transformer into the circuit also, it appears.

Dave_4

Unbelievable. I finally get the right part no. Vaporstat and two different sources I use a lot tried to find the part in Honeywell's database and could not. They assumed it was because they are restricted from sourcing some parts. So I contacted a company whose name was provided to me by the local distributor, and they don't seem to be able to get any info on it either. Several emails into Honeywell, but that takes days to get an answer. Is there a Honeywell guy who monitors this site? If so, sure could use some help.

Dave_4

Well, with a little help from my friends, I finally got the right part no. Vaporstat to replace an old Pressuretrol on my boiler. The right part number seems to be Honeywell L408J1009; however, none of my regular sources could even access this part from Honeywell. So I emailed Honeywell to find out why. They replied that the part no. was good and the part could be ordered, that I should try one of their distributors. So today I spent a good deal of time trying that and was eventually told that the part was not available to them yet, that apparently it was only being currently sold to OEMs for their use on new boilers. At that point I tracked down on the internet a source that still had one of the old mercury switch version (now discontinued) and placed an order. Hope my old Pressuretrol limps through for a few more days (with the occasional rap with a screwdriver when it gets balky). Just thought that anyone who might have been in the market for one of the new microswitch Vaporstats might be interested in all this. Happy holiday to all.