Quote:
Originally Posted by buffalobillpatrick
No interrupt needed.
I measure 6 temperatures around the HP refrigerant loop:
1. Compressor Out / Condenser In
2. Condenser Out / IHX Hi Side In
3. IHX Hi Side Out / TXV In
4. TXV Out / Evaporator In
5. Evaporator Out / IHX Lo Side In
6. IHX Lo Side Out / Suction Line to Compressor
I also measure 4x water temps. Source In & Out, Load In & Out
Analog 0-5vdc pressure sensor on output pipe from water pump.
Code Steps:
1. With pump off, measure static OFF pressure.
2. turn on pump, wait X seconds, measure ON pressure.
3. The pressure delta between these 2 readings represents the plumbing back-pressure (head) that your water pump & plumbing stabilize at.
1 psi = 2.31 feet of head
This delta pressure won't vary unless pump stops working or a blockage condition.
My code, which I don't have access to on Holiday road trip, verifies that the pressure delta stays +- 10% for each water pump.
This is a Go/Nogo test, actual water flow is unknown, so COP can't be determined.
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BBP,
I'm curious why you want all the temp sensors? Seems like maybe 1 or 2 would cover most hazard situations. Are the rest for general data logging?
Also, it seems to me, regarding pressure sensors, that after the 'time period' the system should shut down to avoid damaging the circ pumps.
However, there needs to be some kind of over-ride provided through software or hardware, so that troubleshooting can be performed.
-AC