Best Of
Re: Gorton #2 or Hoffman 75
Multiple Gorton #1's as they appear to be more reliable.
I could never justify the cost and vent rate of a Hoffman 75.
ChrisJ
Re: My three worst jobs sites. What are yours?
any home or building that need a sewer ejector pump service or replacement
hot_rod
Re: Dunham valve rebuild?
i thought the air eliminator was essentially an f&t trap, but looking at the dunham catalog it is just a float to close off the return and let pressure build so that the condensate can return to the boiler if the water backs out to that level
mattmia2
Re: Dunham valve rebuild?
Maybe 1 inch, 2 at the most. 2 inches of water column is not much pressure (1.16 Oz, 0.072 PSIG). The air would push through if the differential pressure was there. Really the air just needs to push through at the arrow
Still should be corrected.
109A_5
Re: Radiator conversions in Canada?
I’ve not seen in the wild but here’s link to company.
https://ecoradinc.com
PC7060
Re: Dunham valve rebuild?
If that vacuum vent on the air eliminator assembly is working — or can be made to work — you don't need and don't want any other vents anywhere else on the system. The system will work just as well — if not better — without them.
With one caution: the crossover traps must be working. Easy enough to check: when the system fires up, the steam main and inlet to the crossover trap should get nice and steam hot, but the outlet should be cooler (it won't be cold — could be as much as 200 to 205 — but distinctly cooler).
If it isn't working, there's no real harm to putting a Gorton #2 on there instead. Unless your system is truly very large, that will be quite adequate. The only downside to that is that the system won't hold a vacuum — which is really no big deal anyway.
The desired maximum pressure for that system is 8 OUNCES per square inch, gauge. You will need to have a 0 to 16 ounce vapourstat to manage that. And no, a greater pressure is not useful. In fact, it will slow or stop the system from running! Not that it will break anything, at least within reason, but you won't get much heat, either, from the fuel you burn…
Re: My three worst jobs sites. What are yours?
Definitely been some gross places and encountered some odd things, like that time I found a severed hand under a 60 year old VA hospital steam boiler that was either pinched off when setting the boiler or tossed in there by a funny employee on their way to the morgue down the hall (same job site, rode the elevator down to the basement AKA morgue with a guy we called Dr Kevorkian who was eager to show us the freshly amputated leg on his cart), but I worked in a R&D facility for a world renowned college about 6-7 years ago and although I was not working in this particular area, another worker brought me over to the area where they were working on an artificial human nervous system. There were cadaver parts, ranging from just a hand to a full corpse, on various tables doing various maneuvers. The one that still haunts me to this day is a pair of legs severed at the waist, with the toes on one foot twiddling around while the other leg was bending at the knee up and down while the foot remained flat on the table. I could deal with the hands and fingers since I have seen enough Addams Family in my day, but the vision of that leg kicking around without an upper body attached will be burned in my mind forever.
GroundUp
Re: Gas boiler heating house without call for heat
Fun story. But " After I plugged the new relay in, I returned power to the boiler and the damper opened. That was it. "
The Damper should only open when the thermostat is calling for heat.
So if the room is 70 and the thermostat is set for 65, the SR501 should not be active, the 'CR' should not be energized, the Damper should be closed and the burner should be off.
109A_5
Re: Gas boiler heating house without call for heat
the damper shouldn't be opening without a call for heat either unless there is some post purge that is built in and it will close after a couple minutes or something but that costs a lot less than keeping the boiler hot all the time.
mattmia2
Re: Cast iron boiler replacement with Navien High Efficiency Condensing Boiler NFB 200H
Assuming that a load calc has been done and that BTU range works for your load there's a few things to consider.
- Not a fan of Navien and their heat exchanger design. There are better boilers in the price range give or take $. Viessman , Burnham / Velocity Boiler Works are my go to. When compared to Navien it's a much better product. Both manufactures have similarly price ranged products. Might spend a few bucks more but it pays in the end. Choose a brand that's well repped in your area.
- I would flush the system prior to installing a modcon such as sentinel or similar product.
- Definitely install a mag filter when installing a new boiler to help further filter the system and protect the heat exchanger.
- Hydraulic separator makes easy work of primary /secondary piping. You can get one with a mag separator if you like.
- Get a zone control panel such as a Taco,Tekmar, etc. Cleans the wire up and makes troubleshooting much easier.
- If you stick with zone valves Taco sentry are a great upgrade from the honeywell and easy to override if needed.
- Follow and read the install instructions.
