I just added a chiller to my system almost a week ago and was using this programming to keep my temps between 76-78F, which worked well:
[Chiller]
Fallback OFF
If Temp > 78.0 Then ON
If Temp < 77.0 Then OFF
If Output ReturnPump = OFF Then OFF
Defer 001:00 Then ON
[Heater]
Fallback OFF
If Temp < 76.0 Then ON
If Temp > 77.0 Then OFF
If Temp < 70.0 Then OFF
Defer 001:00 Then ON
[ChillerPump]
Fallback ON
OSC 000:00/001:00/239:00 Then ON
If Output Chiller = ON Then ON
Defer 001:00 Then OFF
With the program above I noticed my chiller running on and off every hour (one hour on, one hour off, etc). Today I found out my chiller manufacturer recommends a minimum of 2-3 degree variance to reduce cycling on and off. I've updated the program as follows and wondering if this suffice or will it conflict with my heater program:
[Chiller]
Fallback OFF
If Temp > 78.0 Then ON
If Temp < 76.0 Then OFF
If Output ReturnPump = OFF Then OFF
Defer 001:00 Then ON
[Heater]
Fallback OFF
If Temp < 76.0 Then ON
If Temp > 77.0 Then OFF
If Temp < 70.0 Then OFF
Defer 001:00 Then ON
[ChillerPump]
Fallback ON
OSC 000:00/001:00/239:00 Then ON
If Output Chiller = ON Then ON
Defer 001:00 Then OFF
Any help will be greatly appreciated.
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