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I went on a service call to a new customer with a Geo unit. Sometime this winter the unit tripped on high pressure and then remained on emergency heat the remainder of the winter, due to the lockout relay. His latest tech told him he needs a new txv, but he really needs a new unit. The previous tech hacked and butchered at it till he finally admitted he doesn't really understand geo.
The unit is only 15 years old. I would like to fix it, as i believe it is worth saving.
It is an open loop pump and dump.
Here are the symptons.
High side pressure way to high.
Compressor discharge temps reaching 210-220.
Low side pressure to low.
30° temp rise air side.
6° temp drop water side.
I played around with water flow and that is not the issue. Neither does it appear to have an airflow problem.
I believe the water to refrigerant hx is badly scaled.
System is way overcharged.
May have some sludging issues in copper spun filter driers and txv, due to compressor's inhospitable running environment.
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