Thanks for providing the help that you do here. Even diy people like me can be in over their head when it comes to HVAC.
I bought an Aqua Euro chiller (1 hp model) 6 months ago. The chiller turns on, runs for a minute or two (max) and then shuts off for 3-5 minutes (max). This 'cycling' goes on all day and into the evening. At night the aquarium doesn't need chilling much if at all and by late in the evening the chiller quits cycling. I ran it for a month or so in the house before I moved it outside and it ran fine. Now it is housed in a plastic storage unit. I have opened up both ends of the storage unit for better air flow and even built a 'duct' the size of the exhaust from the back of the chiller to route the warm air outside of the storage unit. By the way, we live in SW Florida and the day time temps currently are running in the low 90s. The chiller and storage unit are up againt the north wall of the house and never get in the direct sun. And I raised the 'roof' of the storage unit to vent out any heat build up in the unit. The chiller is working fine in terms of keeping the aquariums between 78-80 degrees. We have a 180 gallon reef, 85 gallon anemone tank and a 130 gallon sump/refugium. The main sump pump is a 3000gph in water pump that is dead quiet and seems to run quite cool (this pump can run as external as well). The temp in the tanks don’t seem to go up or down at all when the chiller turns on and off. It seems to just hold the temp. The water to the chiller is pulled out of the sump by the 3000gph pump which feeds a manifold and returns to the 180g reef tank. The water in the manifold goes about 35% to the 180g reef, 20% to the 85g anemone tank, 10% to a GFO reactor & nitrate reactor and the balance, 35% (about 1000gph) to the chiller. The display tank and chiller are the first feeds off the manifold and the anemone tank and reactors are further downstream from the chiller. I have tried changing the flow rate to the chiller from much less, maybe 3-400gph all the way up to over 75%, or 2200gph. I had hoped that a higher flow would keep the water in the chiller at a constant temp and stop the cycling, but it had no effect. The lines to the chiller are 12-15' long in each direction (half inside the house and half outside in the shade) and covered with pipe insulation.
Questions:
Is this short cycling bad or hard on the chiller?
If it is harmful, do you have any ideas on what I can do to stop it from short cycling?
Again, thanks,
Ron