Best Of
Re: heating oil tank manufacturer's warranty voided by transfer of oil from the old tank?
Transfer the oil to the temporary tank and connect to the existing oil line to get the burner(s) running.
Install new oil tank with new oil line, filter, OSV, etc. to the burner. Plug the end of the oil line at the burner, and close valves.
Fill the new tank while someone is inside at the tank to observe there are no leaks during delivery.
When the temporary tank runs dry, call the service provider and they'll come to connect to the new tank. Replace the nozzle and strainer. Prime and start. Combustion test. Done.
HVACNUT
Re: heating oil tank manufacturer's warranty voided by transfer of oil from the old tank?
Don’t pump it over. Its waste oil now. It’s right in the instructions. If your contractor wants to ignore it, you need a new contractor.
No amount of filtering will make that oil ok. Only a fuel polishing machine would work.
It’s only about 60 gallons, let them take it to someone who has a waste oil heater. Or like the others said, use it in the existing tank until it gets down to about an 1/8.
Re: Minimum boiler temp for Burnham SCG HW boiler
If you use ODR you need to set a min. with CI boilers.
The dewpoint is not an exact number. It varies based on the fuel and the % of CO2, which you could read on a combustion analyzer, adjust the burner to the ideal range.
The 20∆ is just a random number used to design around, yours and many systems may never run an exact 20∆.
The heat emitters ALWAYS dictate the operating condition of the boiler or heat source. Unless you put a control to constrain, or force (not always a good idea) a system to run at a specific condition. Like a ∆T circulator.
hot_rod
Re: What are the most well-established US manufacturers of residential electric boilers
it is not always the case that old heat emitters need high temperature supply.
Certainly not the entire heating season , if at all. Running some load numbers is the only way to know for sure
I have run cast radiators it 120f and you still feel the warmth radiating off them
Any time the iron is above ambient temperature it is giving off heat
hot_rod
Re: Electrical
Agree that there may be a real word scenario that is close to this, but as you said, it is a poor design idea. so the hypothetical may be a good test question, it often backfires with the students of the trade because in makes this bad idea something the the new technicians that are unfamiliar with best practice design believe that this poor design is something that is acceptable or even recommended by the industry. Inefficient and riddled with all kinds of problems, this hypothetical is not in the best interest of teaching our new members of the trade.
Re: What is your longest running Combi Boiler without ever needing Service - excluding maintenance.
This is easy for me and unbelievable. Baxi. I hate to say it but its true, I have had more than a few go 10 + years without touching them. I got a call from what I thought was a former customer because I never heard from them. He let me know, that they hadn't called because there was no need. Maintenance conversation aside, I went over and found it running great. Needed a cleaning, and a flame rod and igniter. Here's the pic. I dont understand it, this thing was on LP, and only did radiant and hot water. It sees the hours, and should need more love. Baxi… I dont like them, but man they have held up for me, so I dont even know why I dont like them.
Tom_133
Re: Boiler Header Manifold
Far be it from me to second guess people motives, tendencies and persuasions, but why not install a quality brass manifold with individual shutoff valves, union connections and flow meters (Roth, Rehau, Uponor…..). Will it really break the bank?
Re: What was the best MacGuyver moment you actually saw on a job site?
you must've had a tee and a cap or a male and female adapter or something. the galvanized in my mom's house had a tee and plug for a 90 where there would have been no other reason for it other than they were short a 3/4 galvanized ell.
mattmia2
Re: Electrical
Whoever gave you the hypothetical scenario does not have a grasp of real world conditions. The fact that you are using steam as the space heating source and a tankless coil as the DHW source eliminates the need for a summer/winter switch. If there is no call for heat the water temperature in the boiler will not make steam to heat the space. The burner will only make enough heat to heat the DHW. Since you need DHW all year by definition, the boiler minimum temperature of 150° with a maximum temperature of 180° will never heat the space and will only heat the DHW. There is never a reason to operate the "Summer Switch" at any time to prevent space heating. Unless. Of course, it could be a trick question to see if you put the switch in there somewhere or explain why you don’t need it.
In order to get one thermostat to operate two boilers without using a 24 VAC source from one of the two boilers requires an independent 24 volt source that is not connected to one of the boilers. The Switching Relay does that by having its own 120 VAC source powering the on board 24 VAC transformer that will provide the low voltage circuit for one thermostat to operate the relay. That relay has 2 sets of contacts that can operate both boilers with separate circuits using separate contacts on the same relay. This isolates the boiler circuits so both boilers can operate independently from the one thermostat while turning off the power supply to the other spoiler for some reason, and will not in any way affect the operation of the remaining operating boiler.
Re: heating oil tank manufacturer's warranty voided by transfer of oil from the old tank?
This is always an issue. Customers would prefer to not throw away oil they paid for.
@HVACNUT has the correct answer.
The other alternative is to burn the old tank down to just below 1/4 of a tank and then install the new tank.
On the other hand, how will the tank MFG find out what went in the tank if no one tells them?
The tank MFG are doing a CYA.
