Best Of
Re: Confused by basement runs in school 2 pipe system
I'm almost certain this was designed as a Vacuum system, where a vacuum pump would draw the condensate up from those basement convectors and would also help pull air from the entire system. The receiver/pump with the box sitting on top is likely some sort of vacuum pump. @Pumpguy is our resident vacuum expert, hopefully he will see this.
Re: Confused by basement runs in school 2 pipe system
- the steam in the returns will kill the pumps in the condensate/feed tanks. Not sure why there are both. Not sure whoever put the last boiler in knew what they were doing either but pumped returns is a little above my head.
- I am not sure how the basement is set up. Is there a pipe below the floor for condensate and a pipe up to the return for vent or just a pipe up? If there is just a pipe up it might need the 5psig to lift the condensate. If it isn't lifting condensate then the pressure probably can be much lower.
- If it is short cycling on pressure either the system isn't consuming the steam that is produced (likely because the air can't get out because your returns are full of steam) or the burner should be modulating or dropping to low fire.
- Figure out what is wrong and what needs to be fixed before adding insulation. Insulation will just make figuring out how it is piped and is supposed to work and making any changes harder.
mattmia2
Re: Rinnai CX119iN tankless water heating units - leaking exhaust seal
$450????? I'd be finding a new manufacturer- that is absolute bogus. $450 barely gets me to the job site, much less unpack any tools
GroundUp
Re: Rinnai CX119iN tankless water heating units - leaking exhaust seal
With the positive pressure gas train deign of mod cons and tankless water heaters I'd be concerned about explosion risk too. Maybe install low level CO detectors and interlock the gas supply to combustible gas detectors.
mattmia2
Re: would you replace these controls immediately or wait and see?
@mattmia2 get ahold of an electrical inspector and get his opinion. we have an electrical department and we deal with flooded houses. any electrical component that gets wet including wire, has to be replaced.
Re: would you replace these controls immediately or wait and see?
ask the relay manufacturer what they recommend.
Prices are going up, replace them now.
Did water run in the flex also? Into the wire nuts? Fresh water? Boiler water? Sea water?
hot_rod
Re: Rinnai CX119iN tankless water heating units - leaking exhaust seal
Sometimes, you have to do things to serve your clients and not get paid full rate. We changed out 15 Viessmann HX's on their recall - good money at $1,000 each. But the recent Triangle Tube safety recall at $350 ea. doesn't really pay well for 3-4 hrs. of labor, but lends itself to summer work when it's slow here. It also builds confidence with your customer base.
Re: Axeman-Anderson oil fired boiler vs. Burnham oil fired
You don't need a new boiler, you need a new oil company. If your oil company suburban propain?, if so get rid of them, I can personally vouch for thier poor service.
You will be spending money on a new boiler that you do not need. The Axeman family still runs their company and they are very good business people with a strong reputation for quality work, coal stoker boilers, oil boilers and parts.
Try the replacement part and find a new oil company with good burner techs.
leonz
Re: Confused by basement runs in school 2 pipe system
The pressure control on the left the PA404A is the operating pressure control
The middle control is a Manual reset high limit….it should be set higher than the PA404A it is a back up if that control fails.
The control on the right is a L91 A or B it does not start or stop the burner it only controls low-high fire
