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Old 12-25-17, 03:37 PM   #11
geoff
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I did. Appears to be the last item to arrive.

The PLC will trigger the defrost. As jeff5may suggests in another thread, I think I'll give delta-T a try.

Although if I can get a ground-source heat exchanger happening soon enough, I can just switch to ground source if it gets too cold outside and abandon the reversing valve entirely.

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Old 12-27-17, 12:47 PM   #12
geoff
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It's official, I've ordered a pair of liquid line solenoid valves. The reversing valve hasn't arrived and it's already obsolete.

I'm going to take my ice cream machine evaporator, and run water through it at atmospheric pressure. No need to get too crazy welding plates. Water will enter tangentially at the bottom, flow up, and drain through a standpipe in the middle.

Then I can switch from air source to water source when it gets too cold outside. No defrost needed, and raise those sweet sweet COPs.

The main housing with compressor and air source evaporator will be mounted outdoors, just outside the wall of my mechanical room. But I think I'll place the condenser and water valve indoors. I can avoid freeze up issues this way.

How many of you guys have your R290 gear in the basement? Any leaks, any worries?
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Old 01-23-18, 07:47 PM   #13
Mikesolar
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I'm about to have an R290 3.5 ton HP in my house. I have a gas boiler but hate the thing. I'm a gas fitter as well and can't stand mid efficiency equipment even if it is only 5 years old. Too many projects like changing my truck over to a leaf motor. Randen is kicking me in the butt to get it going.

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