Started a small system today with 5 RTUs. 3 Voyagers and 2 Precedents all with Reliatel controls. New 'old' Tracker, all comm 3. Precedent units have sensors with thumbwheels, ovrd and cancel. Outdoor air temp was 40°f +/-. Both Precedent units would run 100% economizer AND cool1 down to cooling setpoint. Economizer would stay at approx. 66% when cooling setpoint was achieved. Book says that econo would operate to higher of cool - 1.5 or heat + 1.5
Is there some way to lock out mech. cooling on outdoor air temp? It doesnt make sense that the compressors would run with these OA conditions.
Is there a way to set a wider differential between heating/cooling setpoints? With 'local setting' enabled, differential was 2°f. If 'local' is disabled then you can set what you want.
Outdoor air sensors and mixed air sensors seemed to fluctuate somewhat as well. One unit OA sensor was up to 12°f high at times. Short of changing the sensor, is there a cure for this?
Could it be that we have an 'old' Tracker with the newer Reliatel controls?
Comm line is good. All shielded and EOL etc.
Thanks for any help