Best Of
Re: Condensate Piping- One Pipe
Depends more on where you have space for returns. The high returns won't rust out unless your boiler is throwing water in the mains. You can locate the vents centrally at the boiler.
mattmia2
Re: Replacement PTAC system for a Singer
look into inverter PTAC’s
https://www.totalhomesupply.com/p/friedrich-pvh09k3fc-9000-btu-class-freshaire-series-with-inverter-technology-12-1-eer-ptac-air-conditioner-with-heat-pump-20-amp-230-volt-r32-refrigerant?gad_source=1&gad_campaignid=21772542403&gbraid=0AAAAAD1XDHyefuqVVLU_CP1vIRyj8dF1d&gclid=EAIaIQobChMIxaeTzZe4jwMVPTcIBR2GmjiBEAAYAyAAEgI5ffD_BwE
pecmsg
Re: Replacement PTAC system for a Singer
Any other Singer's in the building you can get the model from?
At the bottom of the diagram, it says "Eac & EAF Chassis" you would think that would mean something
Re: What would an “Expansion Tank Relay” been used for historically?
I think the BX that @mattmia2 was referring to was the BX that is going into the “Expansion Tank Relay” Box. And it looks to me that the other end of that BX it goes into a conduit that heads to a junction box and towards the knife switch disconnect / fuse box. The odd thing is that knife switch disconnect / fuse box has two circuits (apparently both are being used), when only one circuit is needed for a control transformer.
Yes old wiring can be strange at times. And there may have been burner changes over the years.
It all works, so your no touch policy is good for now.
109A_5
Re: What would an “Expansion Tank Relay” been used for historically?
Looking at this closer at least one of the taped wires (Yellow arrows) is actually a connection of two wires, not dead ended.
109A_5
Re: Will I have to drain my whole heating system?
if it is the relief valve there should not be a valve between it and the boiler.
mattmia2
Re: What would an “Expansion Tank Relay” been used for historically?
Depending on your level of curiosity. I'd clean off the dust (Red Arrow) on the Mercury switch to see which end the glass tube the contacts poke into the Mercury, probably the wire end but you never know.
Also the wire insulation changed between the Mercury switch and the connections inside the Orange box and the wires that enter the box. So is that a terminal strip, a fuse holder, a relay, other device?
Be careful with non contact electrical testers, if that Mercury switch actually switches the Neutral side of the circuit and the switch is closed (circuit live and active) the non contact electrical tester may not alert until the switch opens. I see taped wires AND also other wires. If you explore, Be safe, open the knife switch and remove the fuses !!!
109A_5
Re: What would an “Expansion Tank Relay” been used for historically?
I think — and I could well be wrong! — that the switch is mounted on what looks like it might be a wooden arm which is hooked under something on the left side. The bellows pushes up on that arm, and the spring pulls down. But… without actually standing there fiddling with it, I could be all wrong!
Re: What would an “Expansion Tank Relay” been used for historically?
That spring with the screw at the bottom adjusts the setpoint. I think the arm is some sort of phenoilc or phenolic soaked paper or cloth but i can't quite tell if the pivot is on the left or right or at some 3rd point we can't see. If you lift where the bellows contact it, it should tip. Where the pivot is will dictate if it is close on rise or open on rise. I am still surprised that there isn't a manufacturer's label inside somewhere. Even though it is in a 4 square box, it is clearly was made in a factory.
The lever might be ceramic or brass too, hard to tell in that picture.
mattmia2
Re: Need help with new install of radiant with Buderus cast iron boiler
That valve is yet another way to protect a boiler from getting cold return water. It blends some output from the boiler with the return.
In this pic it shows a non electric valve being used to protect the boiler, the 280, and a 3 way motorized valve to mix down the radiant.
There are probably a dozen ways to pipe a system like yours as far as temperature mix down, boiler protection, buffering the over-sized boiler, etc.
Some use electronic controls, like the tekmar options. So use thermostatic valves shown here.
Some use motorized valves. Some use a combination of the above.
Over the years we have tried various mixing ideas, show below are yet more injection mixing ideas using valves and a VS pump. And a pic of 3 valve based mix options.
All have pros and cons.
Trying to KISS yet check all the boxes for what you want or need for your system. If it is a temporary system (boiler), I hate to throw too much technology at it.
I have seen CI boilers connected directly to radiant with a couple ball valves for temperature control, last years before failing. That is an option if this is a throw away boiler?
But keeping it safe also is a concern with the boiler within the boiler within the living enevelop.
hot_rod