ONICON System-30 BTU - Manual (Page 16)

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System-30 BTU Measurement System Manual 05/14 - 0667-2 / 18335
Page 16
Temperature Sensor/ Mode of Operation Relationship with Meter in Return Line
Supply Temp Temperature 2 (External Sensor)
Return Temp Temperature 1 (Internal Sensor)
Mode 1 Total Cooling (Supply Temp < Return Temp)
Mode 2 Total Heating (Supply Temp > Return Temp)