Trane Tracer Unit Ventilator, ZN.520 manual Power Up Sequence, Start-up Procedures

Start-up Procedures

Power Up Sequence

Manual output test can be initiated at any time in the power up se- quence or during normal opera- tion.

When 24 VAC power is initially ap- plied to the controller, the follow- ing sequence occurs:

1.Green Status LED turns on.

2.All outputs are controlled Off.

3.The controller reads input val- ues to determine initial values.

4.Standalone control is assumed unless occupancy data is com- municated.

5.Random start timer expires (5 to 30 seconds, random).

6.Power-up control Wait feature is applied. When power up control Wait is enabled, the controller waits 120 seconds to allow ample time for commu- nicated control data to arrive. If, after 120 seconds, the con- troller does not receive a com- municated occupancy request, the unit assumes standalone operation.

7.All modulating valves and damper calibrate closed, face and bypass damper calibrate to bypass (when present).

8.Normal operation begins after 290 (potentially) seconds have passed.

Note: Manual output test can be initiated at any time.

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