Vaporstat and boiler firing

Terry_12

The system has the original two Mouat(I do not know their size) Vents. One is at the end of the supply main above the 90 deg. elbow (horizontal to vertical transition) and the other one is right beside the supply on the dry return about 6"-8" below the (horizontal to vertical transition)90 deg elbow. This one is T'd off of the vertical return. Although in looking at them tonight, I noticed that the piping going into them should be 3/4", but they were reduced to 1/2". Should that be changed? I had posted photos about a year ago and corresponded with both Gerry Gill and Steve Pajek. They were both interested in the fact that one of Tom Mouat's Systems made it all the way to Fort Wayne, Indiana. Thanks again for your help!

Terry_12

Needing help!

We just recently had a vaporstat installed on our Mouat Vapor steam heating system. I have begun watching the boiler cycle to see if there is a noticeable difference in its operation. My concerns now are the amount of time the boiler will run vs. the time it is off. This evening upon returning home, I raised the thermostat 3deg. from 63 to 66, keep in mind our outside temp. was a high of 54deg. I timed the boiler for 30 minutes and it ran for 23 min. and was off a total of 8 min. But, the total of 8 minutes off was six 30-40 second off cycles and one 4 minute off cycle. When the boiler came back on after the 4 minute off period it ran 4min. and 40sec. more before the mercury switch began to shake and shut down the boiler. The vaporstat worked properly until then. Am I experiencing short cycling, or is this normal do to the system now running on 4 oz of pressure? Also what would cause the mercury switch to shake? Sorry for the winded explnation and thank you for any help you can give!

patrick linhardt

how is the venting

Hi Terry,

To keep the boiler from cycling on the pressure control, especially on a vapor system like the Mouat, the venting has to have the right capacity.

How large is your system?
How much venting do you have?

As with any steam system, is the water clear of any oil on the waterline?

Best regards, Pat

gerry gill

your returns need much more venting

as Pat is suggesting..It was originally coal i bet..with gas you need more venting..also the firing rate is critical on mouat systems..Steve and me just finished putting in a new boiler on a mouat water seal system in a pretty darn big house and we are heating the house with about 1/2 ounce AT THE BOILER. thats how a mouat system should work..gotta love vapor..

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Terry_12

Hi Gerry,

> as Pat is suggesting..It was originally coal i

> bet..with gas you need more venting..also the

> firing rate is critical on mouat systems..Steve

> and me just finished putting in a new boiler on a

> mouat water seal system in a pretty darn big

> house and we are heating the house with about 1/2

> ounce AT THE BOILER. thats how a mouat system

> should work..gotta love vapor..

>

> _A

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> 360&Step=30"_To Learn More About This

> Professional, Click Here to Visit Their Ad in

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Terry_12

Hi Gerry,

What type of venting (SIZE) and would it be in addition to the existing. If all is good with this system are you saying that our system should also run at around a 1/2 oz of presure. Is the under venting also causing the Vaporstat mercury switch to pulse and shake. Thanks again!

gerry gill

big vents,

like gorton #2's would really be needed on the return pipe..at least several of them in a row fed from a 3/4'' pipe..the shaking can be to much pressure, oily water, firing to high on the gas, bad vaporstat location..

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Terry_10

Gerry,

> like gorton #2's would really be needed on the

> return pipe..at least several of them in a row

> fed from a 3/4'' pipe..the shaking can be to much

> pressure, oily water, firing to high on the gas,

> bad vaporstat location..

>

> _A

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> 360&Step=30"_To Learn More About This

> Professional, Click Here to Visit Their Ad in

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Terry_10

Gerry,

Where should the Gorton #2 vents be located? The current Moaut vent is located at the end of the supply main. It is right at the top of a tee that transitions to the boiler return. Just a reminder our boiler is over sized by about 150,000 BTU, could this also be causing any of these issues? Also the vaporstst was mounted at the boiler in place of the pressurestat. Any concerns with this location?
Thanks again for your help!

gerry gill

the gorton #2

should be on the return pipe..its the returns that have to be heavily vented..downfire the gas till the system runs smooth..mouat simmered his steam..you have to make the gas boiler mimic the coal boiler..kind of hard to describe..

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John_101

When you have vaporstat at 1/2 oz what should the diferential be. I was always told 1/2 of the main?

gerry gill

vaporstat

is set at 4 ounces, and differential set at 2 ounces..but its just there as a high limit..if the system is operating as it should it will never be needed, and will not activate..the pressure is measured via a water column gage measured in inches of water..remember, it opens the circuit at a certain point..nothing says you must operate at that point..

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Terry_12

Gerry,

I've lowered the simmering rate of the boiler as you suggested, and I'm amazed at the difference that I've seen already. It has even seemed to calm the vaporstat. I spoke with Ken @ Gorton Heating today, since no one in my area has ever heard of Gorton. So I have messured all the 2" supply lines and have 56' and 65' per zone. How many #2's do you recommend? I have since noticed another problem this evening. The larger run of return is too hot to touch, and per my infra-red thermometer it's around 210 deg. The rads on that side are also hot. In a previous response you suggested orifice plates, or, I believe, it was the Marsh R5 adjustable inlet valve to help mimic the Mouat system. I've chosen orifice plates and TP Tunstall is currently working up the requirements needed for our rads. I know these will also help. But why would one return run be hot and the other cool when the slope of all piping is correct? Thanks!

gerry gill

cause, your

blowing steam thru one or more water seal traps..i believe you had water seals if i remember right..lots of people think waterseals are steam traps, not so..the non mouat valves are the reason..once you get the orifices in it will help alot.

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