Expansion tank and boiler
My Mother-in-law (MIL) calls to tell me she has no heat.
I go over to her place, and while checking things out my wife calls and tells me that the MIL has a "worry-free" contract with the gas co. I say "Good, call them - I'm coming home".
My wife meets the gas co. man today...he quickly finds a burst pipe on one of the baseboard heating units. He also says that the expansion tank needs to be replaced ~ both are NOT covered by the contract. I tell my wife.. "I'll fix the baseboard and we'll see what happens"
So I remove a 5' hydronic baseboard unit and replace and re-pressurize the system.
3 hours later, I head back to check that all is well.
The baseboard are not getting hot. The boiler IS hot (180° +/- degrees), pressure seems good (15psi +/-).
Now I am left with a few questions:
1 - Is is the circ. pump that has decided to take an unapproved vaction?
I do have 120V across C1 + C2, so it seems to me that the relay and t-stat is working fine. I didn't have an amprobe to check for the .70A the motor plate states. Having power on C1/C2 also leads me to belive the control transformer is working "ok".
2 - Is it one - or both - of the 2 zone valves on the system?
The boiler supplies heat for 2 units in the 3-family apt. building the MIL owns. I could see one valve going, but not both at the same time.
3 - What role does the exp. tank play here? If it were broken, would that prevent the hot water from getting to the baseboards?
I am heavily leaning towards the circ. pump being bad here.
Any help folks?
Expansion tank in older home
Thanks for all the help in the last few weeks.
Hopefully one last question.
1992 house, no expansion tank off the hot water heater. The house does have a pressure regulating valve, but no backflow that I can find (I think the PRV acts as one?). I am installing a new water heater, should I install an expansion tank even though the house has never had one, and never had any water come out of the check valve in the previous heater? I am using PEX, how do I support the tank with plastic plumbing (it will be on a wall in the garage)?