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That is a filter drier installed before the expansion valve and it looks as if it has been replaced. You may want another tech as this one seems confused.

I have it on a YJ titan four valve, but do not use the vacuum port it is capped. The AK900 lines up with the gauge ports so no extra fittngs.

A lot of manufactures don't put heaters on the compressors and only suggest them when line set lengths get excessive.
Unless your lines are going to be very long there should be no worries about...

I own three digital sets:

1- Cooper MFM300-kit4, used mainly on critical charged systems. Does a good job, and will data log temperature with mini loggers.

2- Testo 560 with wireless...

Before I tried to recondition any flooded equipment I would check with the Manufacture first.

After Rita in 2005 our company received a letter from Trane through our distributor, that said any...

I think the model heat pumps you listed are all two stage.

I have had two failures on t
he new trane coils since 2006 and one was operator induced. They are very dependable in my opinion.

I would have to check the piston as it looks like it is stuck in the fitting and bypassing refrigerant. Sometimes I have been able to seat them by rapping on the FCCV with the handle of a wrench.
...

That is a scroll compressor and the dome is discharge pressure and temperature.
It should be too hot to touch or hold on to. I actually belive it is an unloading scroll on a two stage unit.

If the unit uses an expansion valve the pressure control is ok to use. If it is cap-tube ditch the pressure control and use the Ranco thermostat already mentioned.
Also the differintial you have on...

Yes I use them alot, usually on units where someone likes to set too low. They do work quite well.
I put them on all voyager units as their low ambient control sucks.

81w04 is the listed Lennox part for your unit.

My 2.5 (30,000 btu) ton Lennox unit has a 26,000 btu compressor in it and is factory installed.

It is probably 20,000 btu common in that size unit with r410a. Lennox rep. for us said Lennox does use other compressors in some models.
I have seen LG scrolls in commercial Lennox units.
That is...

You either have very poor air flow or an iced evaporator coil. Your may be overcharged, but that will not cause such a low suction pressure at 75F return temp only low air flow will cause this with a...

Check the FCCv and make sure it is seated in the housing. If not fully seated it will bypass liquid into the evap and cause the conditions you describe.
I have found this more in The Trane heat...

I believe that tool is pretty new to the field and may not have many people using it now. I have the 560 for a year and it has performed well for me, I broke one pipe clamp and it was replaced in...

I install and service gas logsets that use remotes and at times will have to replace the standard remote with an IR unit. This is due to gargae door units operating the gas burner randomly.

Some...

It could be ok and normal. Lets say you are maintaining -20f SST and have the recomended minimum 20f superheat at the service valve of your compressor. That's a 0f suction line, well below the...

At 225 psig high prs. and 36F box temp. I'll bet thats not R12 and if it is you have condenser prblems or noncondensibles in with it or an overcharge.

The click is probably the overload as the...

3/8 inch SAE

Gotta go with this!!!!

Thats great for him and thanks to him for his service !

The indoor valve does nothing in the heat cycle, so replacing it will do no good for you.
What was the outdoor temperature when you saw 57 psig and 282 psig on his gauges?
What type compressor...

Get a second opinion by a better serviceman.

Most R22 units have a control that trips at 400 to 410 psig. You may have a bad control or if yourchecking at the liquid line valve move to the discharge between the compressor and reversing valve...