Multiple compressor heatpump
I've just embarked on my latest project.
Having run a heatpump all last winter I did find that on a few occasions (very few though!) the capacity was a little short of what I needed and I needed to run the oil boiler - I probably only used about 20 litres of oil though so not bad really!
Anyway, as a new (second hand) twin compressor LG M19L2H U6 (LM1966H2L) unit happened to come my way I decided to link it into the system so I have some extra capacity.
The unit is rated at 5.5Kw and was designed as a twin split. So, I'll have the ability to run 1, 2 or 3 units as needed.
So far I've just done the gas tubing (photos attached). Next job is to build and program the control board - based on a PIC 16F877A development board I bought off ebay.
The plan is to run control wires to each of the 3 compressors to control the compressor and reversing valve. Also to incorporate my auto defrost control circuit (or at least the program) to defrost the units as necessary.
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