Best Of
Re: would you replace these controls immediately or wait and see?
Since the best practice to 'Save' the water contaminated / damaged equipment was not implemented at the time when the damage happened, I would recommend that it should be replaced.
Simply just letting it dry out is (was) not a good plan.
The present problem is where is the corrosion hiding and what issues will it cause in the future ?
It certainly could be cleaned up and the relays replaced (if needed), but it is probably not worth the cost (Vs. replacement) to have it professionally repaired. If the homeowner wants to assume the liability, get it in writing.
109A_5
Re: would you replace these controls immediately or wait and see?
Look at the moisture in those relays and the corrosion around the resistors on the board! The control should have been replaced without any further testing.
The manufacturer of any control that’s been subjected to water like that will tell you to replace it.
You’re not doing yourself or the customer any favor by trying to re-use controls in that condition.
Ironman
Re: would you replace these controls immediately or wait and see?
Those relays will fail — the question is, when? If the equipment is properly fused and safetied, I doubt that there is a fire hazard, but check and make sure that the controlled equipment is properly safetied, as one of the failure modes is to lock something on which shouldn't be.
Me, I'd replace the stuff.
The rice trick is one what to handle electronics which have gotten wet. Another is freeze drying. Niether will help much if the water was salty or otherwise grundgy, not if the exposure was more than just a dunking.
Re: 300 cfm per ton?
Hi Matt,
The system isn't oversized as far as doing a manual J etc is concerned, if anything it's undersized.
RH tends to run in the mid to high 50's when it's mild out and raining, but it also depends on what our machines are doing. If we're running them hard they tend to start steaming off water/coolant so it makes it more humid in the shop.
I'd like low to mid 40's for RH.
I feel a warmer evaporator is the opposite of what I want and reheat is probably the best bet.
ChrisJ
Re: Steam-one boiler or two, and, Atmospheric vs Gun
Gary..for an 8 family unit, I think it's not that pragmatic. 25 or more units, I can justify...unless you have the $$ to tinker & experiment, I'd stay with a single steam.boiler . Mad Dog
Re: would you replace these controls immediately or wait and see?
@Joseph_4, you started with, "I have a customer...". When concerning electricity and water playing together, you need to enter CYA mode. If you give it a pass and something happens, will it be held against you? Your butt is worth more than those parts. I hope, anyway.
HVACNUT
Re: Steam-one boiler or two, and, Atmospheric vs Gun
I'm not sure I see replacing either as economical. The newer ones you could put gas power burners on and replace when they fail individually, maybe put some better staging controls on them that will let you replace the boilers and connect to the existing controls when they do fail. If your balance is good it should still heat at a lower capacity with one boiler. If it does not you could close some radiator valves to reduce the system capacity until you can replace a failed boiler. I suppose it deserves better scrutiny to see if the 2 boilers were piped properly but it looks like whoever did it at least thought they knew what they were doing.
The welded header should have some threaded swing joints added at replacement so it isn't trying to pull the boiler apart but it seems to have held this long.
I thought that tank was for condensate management but looking more closely it is a shell and tube hx for either dhw or more likely a hot water loop.
mattmia2
Re: Is this a house trap?
Before you cut it out, make sure you're not going to allow sewer gases where you don't want them. Mad Dog
Re: Spanish power grid
@JDHW "I wonder why the industrial revolution really got going when steam power came along and we no longer had to rely on windmills and waterwheels? "
Easy. For the first time we had dispatchable power. Worried about "net zero"? Install a bunch of small fission plants and call it a day. 👍
Trying to use non dispatchable, variable output sources is creating problems for which we already have solutions.
Re: Descale combi boiler
Now that I see there are 2 boiler drains and there also must be at least 1 shut off you may be able to use them to circulate an approved descaling fluid through the WH and the Air handler coil.
Not the most effective set up but it could very well work…
kcopp