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Bobinater33 · 12-09-21, 12:50 AM

As for details on the build… well. I must admit that it makes no sense to do it the way I did. I’ve essentially reversed the advancements In HVAC technology back to the 90’s by doing away with the inverter board, EEV, BLDC fan motor and all the proprietary control mechanisms.

What I brewed up is as follows…

Inkbird 1000 PID temperature controller >

Inkbird Heating output: First 30A double pole contactor (120v coil) > 120v attic fan (condenser fan)

Inkbird Cooling output:^ Same as above ^ with an addition jumper to complete the 220v circuit of a 4 way reversing valve. (Future)

Both outputs: Second Contactor (same specs) to close a normally open 24vdc control circuit , initializing the run/forward command of a Teco 3hp L510 Variable frequency drive with its outputs connected to the UVW terminals of the compressor.

The compressor is rated for flammable refrigerants, I’ve decided to move all electrical components to externally mounted enclosures (Nema 40 boxes), all wire connections are made with approved lever clamp connectors. A small (always on) totally enclosed DC fan is circulating fresh air through the compressor compartment. All I’m missing is a flammable gas sensor that will activate a pump down mechanism in the event of a leak.

I followed the Lennox refrigerant piping handbook to the best of my ability.

The liquid HX was made from 1/2” type L copper pipe inside 3/4” type L copper pipe. A total of six passes measuring 30” each. (I’m worried the pressure drop will be harmful and wish I went with 1” and 3/4” copper at a minimum)

A V46 Head pressure actuated water flow valve can be seen at the water inlet of my liquid HX condensor.

They shipped the wrong size TXV (4 ton r22) but I have a 2 ton r22 on its way. I figured i would try to meet that ovesized Txv in the middle by adjusting the superheat way down. The hang that little inverter rotary comp way outside of its spec with over speed , pump water through the HX at full blast and bring in my 14” 1200cfm monster inline fan to move air across the coil.

It will be charged with Propane.

12-09-21, 12:50 AM	#2
Bobinater33 Lurking Renovator Join Date: Dec 2021 Location: Buckeye,Az Posts: 18 Thanks: 2 Thanked 8 Times in 6 Posts	As for details on the build… well. I must admit that it makes no sense to do it the way I did. I’ve essentially reversed the advancements In HVAC technology back to the 90’s by doing away with the inverter board, EEV, BLDC fan motor and all the proprietary control mechanisms. What I brewed up is as follows… Inkbird 1000 PID temperature controller > Inkbird Heating output: First 30A double pole contactor (120v coil) > 120v attic fan (condenser fan) Inkbird Cooling output:^ Same as above ^ with an addition jumper to complete the 220v circuit of a 4 way reversing valve. (Future) Both outputs: Second Contactor (same specs) to close a normally open 24vdc control circuit , initializing the run/forward command of a Teco 3hp L510 Variable frequency drive with its outputs connected to the UVW terminals of the compressor. The compressor is rated for flammable refrigerants, I’ve decided to move all electrical components to externally mounted enclosures (Nema 40 boxes), all wire connections are made with approved lever clamp connectors. A small (always on) totally enclosed DC fan is circulating fresh air through the compressor compartment. All I’m missing is a flammable gas sensor that will activate a pump down mechanism in the event of a leak. I followed the Lennox refrigerant piping handbook to the best of my ability. The liquid HX was made from 1/2” type L copper pipe inside 3/4” type L copper pipe. A total of six passes measuring 30” each. (I’m worried the pressure drop will be harmful and wish I went with 1” and 3/4” copper at a minimum) A V46 Head pressure actuated water flow valve can be seen at the water inlet of my liquid HX condensor. They shipped the wrong size TXV (4 ton r22) but I have a 2 ton r22 on its way. I figured i would try to meet that ovesized Txv in the middle by adjusting the superheat way down. The hang that little inverter rotary comp way outside of its spec with over speed , pump water through the HX at full blast and bring in my 14” 1200cfm monster inline fan to move air across the coil. It will be charged with Propane.