This is what my little head came up with.
[chiller_outlet]
Fallback OFF
Set OFF
If temp > 80 Then ON
Defer 005
[chiller_pump_outlet]
Fallback OFF
Set OFF
If temp > 80 Then ON
Defer 001
If temp < 80 Then OFF
Defer 010
This "should" work like this. Your aim is to maintain temp below 80deg.F. What it'll stay above depends on your heaters. This way, your chiller pump won't be on during the day. It'll only come on when needed, saving your energy.
Your chiller will come on if temp is above 80. However, it's delayed 5minute so your chiller pump (will start after 1minute if temp is above 80) has a chance to start cycling water thru the chiller. If temp falls below 80, your chiller will be off, however, I keep the chiller pump on just for a little longer to bring the chiller internal to the same temp as the tank water.
I like to use Defer to provide any spike from constantly turning on and off my devices.
This is probably not perfect, the last time i programmed my apex was 2 years ago. Hope it works for you.
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