My question pretains to a walk in freezer with a Copeland compressor (exterior of bldg.) 40ft. from walk in cooler (inside bldg). Evaporator is higher then compressor.
I'm new to refrigeration and have seen defrost timers wired to shutoff the compressor and liquid solenoid valves and some that only shut off liquid solenoid valve and let the compressor cycle on pressure. Some defrost timer installation instructions actually show shutting off the compressor and using the temperature switch to shutoff the liquid solenoid but not the compressor. My question is what method is best? I'm leaning to using the defrost timer in series witht the temperature switch and just letting the compressor run on pressure control. From everything I gather in studies that would allow the liquid to stay out of the EVAPs during off cycling (both temperature and defrost). But is this as safe as also turing off compressor?