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Mitsubishi uses linear electric valves. More or less a stepper motor, increasing and decreasing orifice size per multiple thermistor readings to the processor. There is 3 LEV's on a twin system.

From manual.

What size indoor units for each system?

You got screwed. Pre charged for 131' of lineset. After that you need to add 1.08 oz. Per additional 5ft of liquid line (small line). Max run length to each indoor 84 feet. Total system can not be more than 164' feet. Your system is overcharged! Or he charged you for refrigerant he never used...

It will condense from vapor back to liquid state.

Main purpose is for maintaining proper total super heat to compressor. Without it may absorb to much heat and slug liquid refrigerant into the compressor causing failure.

Thanks! took 4 weekends to make and paint.

Yes insulation for the refrigerant line. Only really need it on the suction line ( bigger one).

Make sure to use armor flex, 1/2" wall and tape or glue the ends together. It will be fine.

Smoker I made last winter. All walls and doors insulated with 3000°F ceramic. All doors have boiler gasket P type Gravity fed chute to fire box reverse burn. Removable racks and grease trap to bottom with ball valve. In place!

X2 most likely needs dual cap.

Teflon tape it then pipe dope. And tighten. Looks like there is a union on the other side to the manifold. Easy to change out.

Clogged filter at tank, plugged strainer at pump, clogged nozzle, bad motor ,bad primary control, list goes on. Call a professional.

Mxz series mitisubishi outdoor units come in different sizes from 2 to 8 indoor heads. Max refrigerant line length to each indoor is average 82 feet. Proper placement of the condenser can usually cover most homes and garage. Example of a 3:1 system...

Don't need to keep the mini split on 24/7. Turn off when your done.

I have one works ok. But bubbles dont lie or need recharging!

These are by far the two best on the market.

The senville would be the best pick of the ones listed. As it is inverter driven and seems to be the only one that will operate at -15. What capacity it has at that temp is unknown. How well it performs will be very dependent upon how tight an envelope the space is. Biggest heat/cool loads will...

Condenser unit size and type will dictate wire size and amperage. Better off running conduit to it and leave a pull wire in it. Other wise you are wiring for an unknown? Seems wasteful.

Operating range for the one posted in heating is 47° to 17°. 25k btus at 47 and 22k btus at 17. May work in lower outdoor temperature but capacity will drop significantly. This may require you go up in size to compensate. Sent from my SM-N900V using Tapatalk