Best Of
Re: Which indirect water heater to buy or not?
Replace it with a standalone water heater and let your boiler rest (and not heat your building) during the summer.
Re: What was the best MacGuyver moment you actually saw on a job site?
Yeah a fuse is less costly except when you don't have one.
The utility wires coming into your house overhead have fuses at the transformers. Underground utility wires have no fuses. The wire is the fuse let it Burn!!
@PC7060 It didn't leak so we never went back. This was a 26 story high rise and we were not on the top floor (i think we were on floor 12 or 14 so there was a ton of pressure on the system. They wouldn't allow another shut down to drain and drill or anything.
We installed the biggest plate and frame HX I ever saw. It was too heavy for the elevator so we had to purchase it knocked down and pay Alfa Laval to send someone up to supervise the assembly
Re: Boiler Header Manifold
i'd be more concerned about the pipe and the threads which aren't mutually exclusive
mattmia2
Re: Confused by basement runs in school 2 pipe system
I have a few copies of these booklets left. The pages are composed of reduced copies of the pages Nash last published in their heating pump engineering data book in 1966. We printed a run of these booklets back in 1992 to help promote our Type CLS vacuum heating pumps which we introduced at that time.
We still offer these latest design Type CLS vacuum units.
The pages I post here from time to time are full size copies of these pages.
In this particular case, I don't believe the problem of the induced vacuum caused by condensing steam in the boiler resulting in the boiler being flooded by atmospheric pressure pushing feed water from the vented boiler feed tank is covered in these pages.
The solution to this problem is to remove the swing check valve on the discharge of the boiler feed pump(s) and substitute a motorized or other type of normally closed positive closing valve.
This positive closing discharge valve needs to be controlled by the boiler water level controls. When the boiler needs to take on feed water, the boiler feed pump is energized and the valve should open. When the boiler water level is satisfied, the boiler feed pump is de-energized and the motorized valve should close.
When the motorized boiler feed valve is closed, atmospheric pressure can't push feed water from the vented boiler feed tank into the boiler even if the boiler is at a vacuum, i.e. a pressure lower than atmospheric.
A simple swing check valve won't work since it only stops flow in one direction, away from the boiler. In this case we need to control flow in both directions, toward and away from the boiler.
Pumpguy
Re: "Yelp"/ angi list for contractors.
The most uncomfortable part of running a Plumbing & Heating business is discussing $$ & payments. Get it out of the way as fast as possible ...a ball park range is better than nothing. This, especially holds true with relatives, friends & people you know. Get it out of the way and be 100% clear, cogent & concise.
If there's any waffling or trifling, it's better you both know BEFORE a piece of pipe is purchased or installed. Worst case, we shake hands and go our separate ways. Mad Dog
Re: Replacing Sections in American Peerless Radiator
Unfortunately, this rarely works. We've tried it and they just don't go back together the same way they came apart, so they leak.
Re: "Yelp"/ angi list for contractors.
Remember one thing, Steam Whisperer, criminals, shysters & grifters have the upper hand and more rights than we do. Mad Dog
Re: Modbus RS485 chain question
Important bit is to use shielded twisted pair. The shield should only be grounded in one spot right at the PLC.
Generally mobus RTU is pretty forgiving. If you have long run don't forget the termination.
Kaos