Orion-system Lead Controller Instrukcja Użytkownika Pobierz pdf (Strona 45)

Lead/Lag Controller Technical Guide

Appendix A - Sample Conﬁ gurations

2 Lead/1 Lag Example - Controlling 3 Roof Top Units

2 Lead / 1 Lag Example - Controlling

Roof Top Units

The user would like to use the Lead/Lag Controller to control 3

Roof Top Units that are feeding a large surgery suite. They need 2

of the units to run all of the time. RTU-1 and RTU-2 will run ﬁ rst,

and at the end of the Changeover Interval, RTU-2 will shut off,

and RTU-3 will be energized. After the next Changeover Interval,

RTU-1 will shut off and RTU-2 will be brought back on. We select

2 Lead/1 Lag as the control method. Each RTU has its own supply

air temperature sensor and is trying to maintain 55°. If the supply air

gets above 60° on one of the RTUs, it will be shut down, the third

unit will be brought on, and an alarm will be sent. See Figure 84.

Figure 84: Lead/Lag Status after Conﬁ guration

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 55 56

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