Timed Override Control; Morning Warm-Up; Morning Cool-Down - Trane Tracer ZN511 Installation And Operation Manual

Chapter 5 Sequence of operations for the heat pump configuration
28

Timed override control

If the zone sensor has a timed override option (ON/CANCEL buttons),
pushing the ON button momentarily shorts the zone temperature signal
to the controller. This short is interpreted as a timed override on request.
A timed override on request changes the occupancy mode from unoccu-
pied mode to occupied bypass mode. In occupied bypass mode, the control-
ler controls the zone temperature based on the occupied heating or
cooling set points. The occupied bypass time, which resides in the Tracer
ZN511 and defines the duration of the override, is configurable through
the Rover service tool from 0 to 240 minutes (default value of 120 min-
utes). When the occupied bypass time expires, the unit transitions from
occupied bypass mode to unoccupied mode. Pushing the CANCEL button
momentarily sends a fixed resistance of 1.5 kΩ to the ZN analog input of
the controller, which is interpreted as a timed override cancel request. A
timed override cancel request will end the timed override before the occu-
pied bypass time has expired and will transition the unit from occupied
bypass mode to unoccupied mode.
If the controller is in any mode other than unoccupied when the ON but-
ton is pressed, the controller still starts the occupied bypass timer with-
out changing the mode to occupied bypass. If the controller is placed in
unoccupied mode before the occupied bypass timer expires, the controller
will be placed in occupied bypass mode and remain in that mode until
either the CANCEL button is pressed on the Trane zone sensor or the
occupied bypass time expires.

Morning warm-up

The morning warm-up feature is initiated when the controller is in tran-
sition from unoccupied to occupied and the zone temperature is 3°F
(1.7°C) below the occupied heating set point. The fan will be turned on
and the outdoor air damper will remain closed. When the zone tempera-
ture reaches the occupied heating set point, the controller begins operat-
ing in the occupied mode.

Morning cool-down

The morning cool-down feature is initiated when the controller is in tran-
sition from unoccupied to occupied and the zone temperature is 3°F
(1.7°C) above the occupied heating set point. The fan will be turned on
and the outdoor air damper will remain closed. When the zone tempera-
ture reaches the occupied heating set point, the controller begins operat-
ing in the occupied mode.
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