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Please look at what I said earlier: a desuperheater cannot heat a radiant floor. It only produces useable heat in the cooling mode on warm day. And then it’s only about 500 btus per ton.

If indeed...

I think your description of the issue is somewhat flawed. A DS won’t produce enough heat for a radiant floor: it’s only designed to add some heat to a water heater.

How about posting some pics of...

How the typical “tech” diagnoses: “Uh, the pressure switch won’t remain closed. Let’s replace it for doing its job. Oh, that didn’t work. Let’s replace the inducer because that’s in the vent...

As stated, anything is possible. But is it likely? Absolutely not.

The wiring and controls are in the upper part of the condensing unit. The water level would have to rise to that level for the...

Sure, just go ahead and remove it! The manufacturer got a real deal on those and they had to use them on something.

You need to get rid of both of those idiots that think that you can remove a...

I can understand wanting to use a wet rotor circulator like the Grundfos, but the question that needs to be considered is how do we know that the B&G was the correct size? Most hydronic systems are...

Most oil boilers are over-sized, but a Manual J heat loss calculation should be done to see if the boiler will provide sufficient heat if down-fired.

Is this a steam or hot water system?

Is the heat exchanger clean?

Please note that site rules prohibit us from giving DIY advice.

However, I would make sure that the condensate drain is clear.

The Bosch use a “demand defrost” which means it only does it when necessary. Many other models use “time and temperature” which can result in a lot of unnecessary defrost cycles.

The demand...

A defrost cycle that lasts 8 minutes is very rare. Most are under 90 seconds. It makes no sense to attempt to run the gas furnace for that.

We do a lot of Bosch dual fuel and never connect the “W”...

That’s a very common and inevitable failure on that boiler.

I’d recommend replacing it.

You need to find a competent HYDRONIC contractor, not your everyday forced air HVAC guy.

Where are you...

Any piping above the water line should be black iron; copper can be used below the water line, but it should not be connected directly to the boiler. In other words, copper is okay on the wet return,...

But only on Thursdays.🤣

There’s a lot more to installing a boiler than just setting it in place and connecting some pipes. Modern condensing boilers require proper system design, sizing, installation and service along with...

It could be the wind, but shortening the drain would be a simple first step.

Both are good boilers, but you really should be focusing on the installer: he’s 95% of the equation. This isn’t like buying a TV or a washing machine.

Did either one of them do a scientific heat...

The electric heat pack is 7.5kw if it’s connected to a 208v system or 10kw if it’s connected to a 240v system.

In an apt. bldg., it could be either one. An electrician would know which one you...

I’d recommend the Bosch, but getting the right contractor is far more important than the brand: he’s 95% of the equation.

I’m near Staunton.

Where are you located?

The system is designed to work that way. It’s a listed AHRI match.

It’s a refrigeration issue, not air flow.

The business about turning the unit off to let the oil redistribute is nonsense.

You need to look for a competent contractor.

Can you post a pic from further back of the furnace and evaporator coil?

There’s not an “industry standard”.

The Cycles Per Hour should be set to match the type of equipment that you have.
The same goes for the dehumidification settings, howbeit, a system typically...

Can’t tell from that pic.
Site rules prohibit DIY advice, so IDK how much help can be given.

This ^^ ^^.

It will work fine if no setbacks are used and it’s set to 1 CPH.

The kind of work that you’re considering requires specialized tools and training. It’s not a DIY project.

Please keep searching for a competent HVAC contractor.

“Smart thermostats” or setback should never be used with modulating equipment. They actually will cause higher energy consumption and reduce comfort.

Use a simple heat pump stat, set it to one...

When you say the supply water temp was hot, how hot?
Please provide a specific temperature.

As mentioned, the cast iron rads and fin tube base boards require a much higher water temp than an air to water heat pump can provide. You could use that for milder weather and use a boiler for...

The heat coming from your vents may be from the backup electric heat elements. You need to go outside and see if the heat pump actually comes on when you turn it to heat.
In either case, it’s not a...

If the solenoid coil on the RV were bad, that could also cause it to be stuck in heat, but it wouldn’t cause it not to run at all in cooling. The coil can be replaced without changing the RV.

The ADP AHU was probably selected because it provides the hydronic and refrigerant coil in one unit. There’s no way of knowing what the efficiency ratings will be unless it’s been tested and AHRI...

Multi zone ductless systems move refrigerant through the indoor units even when they’re “off”. They will also keep the blower on a very low speed so that the unit can sense the room temperature.
...

Over zoning any system is not a good idea and is usually unnecessary.

To give a simple answer: the smallest zone should be equal to the minimum capacity of the equipment. Using a bypass damper is...

Honeywell has several models.

You need to check with someone who services RVs.

Your previous system was designed for A/C not heating because you had the hydronic system for that. Using that to size a new system that has to heat the structure without any back up is major...

The I series outdoor units have been discontinued. I’m sure Unico can provide performance data, but they weren’t “HyperHeat” type units.

Unico furnishes free design services. Why didn’t your...

What’s the make of the outdoor units?

Your installers definitely lack knowledge on system design. Do you still have your baseboards and boiler?

The system may be capable of running in sub zero temps, but that doesn’t mean it can...

These are technical questions that a competent technician should know following the manufacturer’s I/O manual.

We can’t give DIY advice as per site rules.

What “water tank” are you referring to? The expansion tank or do you have an indirect water heater?

In either case you don’t wanna run the boiler without at least 12 psi on the system.

Have you compared weather data and degree days for the time?

It’s doubtful that an issue on the hydronic side would cause an ignition failure.

Was a combustion analysis done?

I’d recommend that you contact someone who knows the boiler and how to diagnose...

Site rules prohibit discussing prices.

However, using an online price calculator can be very inaccurate. $7500 is a ridiculously low number. Since google says that should be the price, see if you...

Most of the D/X hydronic AHUs that are offered can only be paired with the basic builder’s model outdoor units - the lower seer.

If you add a hydronic coil in the supply plenum, you can use any...

Site rules prohibit giving DIY advice, but if the blue wire is not connected at the AHU and heat pump to the Y2 terminal, you won’t have the result that you want.