Chiller problem

[Surfside74]

Hey everyone. I have a current 1/15 hp chiller I was going to connect to a biocube 29. I attempted this before but it did not work. The temp would drop down to 78 degrees for a minute, then would go back to 81 degrees resulting in the chiller kicking on again. It did this constantly. I was using the stock oceanic pump for the chiller as I replaced the main return pump with a Maxijet 1200. Thought maybe the pump wasn't strong enough. Any ideas. I would like to install it as I am doing a full reef system. Any help would be great. Thanks.
Rob

 

[Montrosereef]

Be sure you connect the water intake and output correctly. This happens when you hook them up incorrectly.

 

[Surfside74]

I believe I have it hooked up correctly. Left side is intake and right side is return to the display tank. Is that not correct?