Best Of
Re: Air in oil lines - potential tank relocation
How did he determine 'pump wasn’t pulling enough'?
Re: How drain boiler for repair?
As you sure there isn't any water in the tube as you try to heat it. Even a trickle, fast drip will prevent the tube from getting hot all around.
Jam a few slice of Wonder 🍞 Bread up the tube to temporarily stop a small flow. That's why they call it Wonder bread.
hot_rod
Re: Mitsubishi MUZ-FH12NAH evaporator doesn't get cold
Check the valve on the mixed-phase ("liquid") line. It shouldn't be frosty, just wet with condensation when it's working. Something's restricted, the valve is the simplest answer.
After that, check the EEV. Make sure the coil is snapped down tight & plugged in. Maybe check the coil windings for continuity. Mitsubishi makes a magnet that'll drop over the EEV & allow you to manually stroke it. Once I found one that was sticking, I managed to free it up with the magnet.
ratio
Re: Help me calculate pressure drop!
The more a boiler, typical with oversized boilers, cycle , the lower the efficiency
So steady state or lab tested could show 82-84%, cycle efficiency could drag it down into the 70%
but that will always be the challenge with a non modulating boiler. 80% of the year it is oversized, even if it is spot in sizing for design day.
So a combustion analyzer showing burner efficiency is not telling all of the story.
My opinion is a mod con, even on a high temperature system will run in the mid 80s throughout its firing range. High 80 or 90 if it can condense part of the time.
hot_rod
Re: Mystery domestic water line
Our gym built in the 70's had a water service at each end.
Although there is a main valve on each end, there is also an outside curb stop which utilities will locate or have on a map. I would check with them first.
JUGHNE
Re: Learning my system: WGO-4 firing up-to12x/day in summer
It appears you don't have any Zone Valves, systems usually have one method or the other, Zone Valves or zoning using circulators, yours uses circulators. The isolation your documentation requires is provided by the " X-X Isolated End Switch " terminals provided by the Taco SR504. The X-X Isolated End Switch is an isolated contact closure when one of the zones is calling for heat. That isolated contact closure is how the Taco SR504 tells the boiler to fire.
I suspect one of two things why it was wired as found.
Not enough DHW in the Winter so they forced the boiler to maintain 180 degrees with only the High Limit of the L8184A as the boilers temperature control. IMO that wastes a lot of fuel and adds to the wear and tear of the system.
and/or
They did not understand the Zone 4 priority for DHW, so in the Winter time there was insufficient DHW so keeping the boiler water at 180 degrees solved that issue at the price of a lot of fuel use to keep the boiler at 180 degrees constantly.
As mentioned above I would connect the L8184A thermostat terminals (T-T) to the Taco SR504 X-X Isolated End Switch terminals and move the DHW thermostat and circulator wiring to Zone 4 and turn the priority switch on.
109A_5
Re: Worst advertising
That just screams Europe.
But two hands on KniPex? And it looks like between two fixed points.
Rick
Re: OT: Underground Wiring Options
As an extra precaution, I always place the "Caution Buried Cable" or "Natural gas" tape 6-8 inches below the grade also. I do this because I've seen overly exuberant diggers chopper right through the tape and pipe or cable, ignoring the caution tape. The tape is cheap enough. Mad Dog
