Replace Pressure Reducing valve and Backflow Preventer Weil Mclain CGA

[John Gayewski]

It might be best for you to take a picture from a distance away. Get as many of the components in the picture as you can.

A union connection somewhere will allow you to fill the piping without trapping a lot of air, or you could, as you say open the boiler drain and fill. If it were me I'd want to fill from below let the air come out of the top, then seal a union or purge valve. There are millions of possible orientations and techniques to fill and purge. It's best if have valves to open and close to fill and purge.

 

[Jason1]

Thank you all again. Wow! Big Boiler!

Can anyone answer my question regarding setting the cold pressure after replacing the prv and expansion tank. I have a fairly simple system and the answer seems obvious. But I'm just asking to make sure.

The tridicator reads the pressure when the water flows in, so to verify the prv is working correctly - open the boiler drain and run some water through.
If it reads 12 psi you're done. Does that make sense?

 

[Sponsor]

 

[John Gayewski]

That does make sense.

Thank you all again. Wow! Big Boiler!

Can anyone answer my question regarding setting the cold pressure after replacing the prv and expansion tank. I have a fairly simple system and the answer seems obvious. But I'm just asking to make sure.

The tridicator reads the pressure when the water flows in, so to verify the prv is working correctly - open the boiler drain and run some water through.
If it reads 12 psi you're done. Does that make sense?

That does make sense go for it. Just don't trap air or your gauge won't be an accurate representation of your system pressure.

 

[Fitter30]

Jason, a lot going on there .. Imagine if you had this boiler to service?

View attachment 77329 View attachment 77331

Looks like a city school boiler room with cleaver brooks burner.

 

[Jason1]

Thank you John,

I plan on opening the valve that feeds the heating zones last so that any air that entered the system during the job exits through the air eliminator on top of the expansion tank located before the valve:
https://www.supplyhouse.com/Resideo-PV100S-1-Sweat-Supervent-Air-Eliminator

I'm guessing any air that enters the boiler during the job will exit up and out of the eliminator or out of the boiler drain, and when only water is exiting the boiler drain the tridicator reading should be accurate. Is that the correct approach?

Some air will get in, but it will have two paths out - 1. up the pipe feeding the zones and out the eliminator and
2. out of the boiler drain.

 

[Sylvan]

Looks like a city school boiler room with cleaver brooks burner.

It is a Clever brooks one of my apartment building accounts and this is another account

 

[Fitter30]

At least the water looks clean. Sump pump die? Never understood why sumps never have a alarm and why all old boiler rooms set the boilers in pits other that more headroom just save dollars to lower the floor.

 

[John Gayewski]

At least the water looks clean. Sump pump die? Never understood why sumps never have a alarm and why all old boiler rooms set the boilers in pits other that more headroom just save dollars to lower the floor.

Becuse when boilers where all steam they needed the A&/or B dimension/s to flow condensate by gravity.

 

[Sylvan]

At least the water looks clean. Sump pump die? Never understood why sumps never have a alarm and why all old boiler rooms set the boilers in pits other that more headroom just save dollars to lower the floor.

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The IDIOT managing agent took the sales rep saying a "Duplex " pump was too costly and the plumber doesn't need redundancy he is just looking to make an extra $450"

I did suggest not only a high water alarm and a battery back up pump should be
considered

After this flood they allowed me to install all the bells and whistles as they came very close to losing the boiler and possibly half the building as this flood happened on a Sunday around 2 AM 21 DEG F outside caused a frozen pipe to cause the leak and the small sump pump was 1/3 HP

After this they fired the managing agent and went for over $2,000 in upgrades