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Robert Shaw 7000 Series Gas Valve Paul of Dayton 01-04-2007
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Posted by Paul of Dayton on January 4, 2007, 12:08 am
Hi Folks -

I lurked here a few years ago when my Trane Vapor Steam system was getting a
new WM boiler. I learned much and have sweet, even heat... well, until now.

When I started the system this fall, the pilot wouldn't stay lit. Using the
old water heater rule, I replaced the milivolt thermopile with a new exact
replacement. Since then there have been 2 or 3 times I've had to relight the
system. Tonight it won't relight. I put my digital voltmeter on the pile,
after a minute or so it is at 750mv which is spec. I'm thinking the magnetic
safety is shot. Any opinions? I plan to visit the local supply house for one
tomorrow but I'd like to hear what the pros say. Thanks!

PoD



Electric Radiant Heat 468x60
Posted by on January 4, 2007, 2:05 am

>Hi Folks -
>
>I lurked here a few years ago when my Trane Vapor Steam system was getting a
>new WM boiler. I learned much and have sweet, even heat... well, until now.
>
>When I started the system this fall, the pilot wouldn't stay lit. Using the
>old water heater rule, I replaced the milivolt thermopile with a new exact
>replacement. Since then there have been 2 or 3 times I've had to relight the
>system. Tonight it won't relight. I put my digital voltmeter on the pile,
>after a minute or so it is at 750mv which is spec. I'm thinking the magnetic
>safety is shot. Any opinions? I plan to visit the local supply house for one
>tomorrow but I'd like to hear what the pros say. Thanks!
>
>PoD
>

everything built by man will fail at some point in time.

Posted by Bubba on January 4, 2007, 8:33 am
On Thu, 04 Jan 2007 05:08:32 GMT, "Paul of Dayton"

>Hi Folks -
>
>I lurked here a few years ago when my Trane Vapor Steam system was getting a
>new WM boiler. I learned much and have sweet, even heat... well, until now.
>
>When I started the system this fall, the pilot wouldn't stay lit. Using the
>old water heater rule, I replaced the milivolt thermopile with a new exact
>replacement. Since then there have been 2 or 3 times I've had to relight the
>system. Tonight it won't relight. I put my digital voltmeter on the pile,
>after a minute or so it is at 750mv which is spec. I'm thinking the magnetic
>safety is shot. Any opinions? I plan to visit the local supply house for one
>tomorrow but I'd like to hear what the pros say. Thanks!
>
>PoD
>
Its your thermostat. Its almost always the thermostat. Ask my
customers. Make sure you use a good quality (expensive) digital
programmable one. Change the low voltage wiring while you're at it.
The wiring has to match the thermostat.
Bubba

Posted by Bob Pietrangelo on January 4, 2007, 8:55 pm
How old is this WM boiler that it is still using a T-pile. I haven't seen a
WM boiler with a T-pile in a very long time, I mean one that was built in a
very long time, unless you had a used boiler installed a couple of years
ago.

--
Bob Pietrangelo
bobp3@comcast.net
bob@comfort-solution.biz
www.comfort-solution.biz
On Time or Your Service Call is FREE
Preventive Maintenance Specialist




> Hi Folks -
>
> I lurked here a few years ago when my Trane Vapor Steam system was getting
> a new WM boiler. I learned much and have sweet, even heat... well, until
> now.
>
> When I started the system this fall, the pilot wouldn't stay lit. Using
> the old water heater rule, I replaced the milivolt thermopile with a new
> exact replacement. Since then there have been 2 or 3 times I've had to
> relight the system. Tonight it won't relight. I put my digital voltmeter
> on the pile, after a minute or so it is at 750mv which is spec. I'm
> thinking the magnetic safety is shot. Any opinions? I plan to visit the
> local supply house for one tomorrow but I'd like to hear what the pros
> say. Thanks!
>
> PoD
>



Posted by Paul of Dayton on January 4, 2007, 9:38 pm
New unit, fresh from the wholesaler, EHG95S, installed 10/02. It is a steam
system. I have tried to find the magnet safety part today, there was a
recall for newer valves of the same type and the magnet was all that was
replaced. Nobody can get it. I called Robert Shaw and they can't get it.
They think it's a special model for W-M. I may just replace the whole
ding-dong valve. It shouldn't be too hard to find a slow opening valve with
1" fittings that will fit the 400,000 BTU burner... (but what a pain).

The first boiler I ever worked on had a manual lever on the side of the
valve to use in power failures. It had one thermo-pilot and about 6 igniter
pilots that were piped directly to the gas line. (I am not ready to trade
the safety features of this setup, tho.)

There was supposed to be an electronic ignition option for this unit but the
boiler guy recommended against it. So much for reliability of the old
design.

Thanks!

PoD




> How old is this WM boiler that it is still using a T-pile. I haven't seen
> a WM boiler with a T-pile in a very long time, I mean one that was built
> in a very long time, unless you had a used boiler installed a couple of
> years ago.
>
> --
> Bob Pietrangelo
> bobp3@comcast.net
> bob@comfort-solution.biz
> www.comfort-solution.biz
> On Time or Your Service Call is FREE
> Preventive Maintenance Specialist
>
>
>
>
>> Hi Folks -
>>
>> I lurked here a few years ago when my Trane Vapor Steam system was
>> getting a new WM boiler. I learned much and have sweet, even heat...
>> well, until now.
>>
>> When I started the system this fall, the pilot wouldn't stay lit. Using
>> the old water heater rule, I replaced the milivolt thermopile with a new
>> exact replacement. Since then there have been 2 or 3 times I've had to
>> relight the system. Tonight it won't relight. I put my digital voltmeter
>> on the pile, after a minute or so it is at 750mv which is spec. I'm
>> thinking the magnetic safety is shot. Any opinions? I plan to visit the
>> local supply house for one tomorrow but I'd like to hear what the pros
>> say. Thanks!
>>
>> PoD
>>
>
>



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