Heating Or Cooling Mode; Fan Operation; Compressor Operation; Reversing Valve Operation - Trane Tracer ZN517 Installation And Operation Manual

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trol an air damper actuator for two-position control, configure the Tracer
ZN517 for economizing (economizing will not function).

Heating or cooling mode

The heating or cooling mode can be determined in one of two ways:
By a communicated signal from a BAS or a peer controller
•
Automatically, as determined by the controller
•
A communicated heating signal permits the controller to heat only. A
communicated cooling signal permits the controller to cool only. A com-
municated auto signal allows the controller to automatically change from
heating to cooling and vice versa.
In heating and cooling mode, the controller maintains the zone tempera-
ture based on the active heating setpoint and the active cooling setpoint,
respectively. The active heating and cooling setpoints are determined by
the occupancy mode of the controller.
When no communicated signal is present (stand-alone operation) or the
communicated signal is auto, the controller automatically determines the
heating or cooling mode.

Fan operation

The Tracer ZN517 can be configured to run continuously at a single speed
or to cycle on and off automatically. If configured for continuous opera-
tion, the fan runs continuously during the occupied, occupied standby,
and occupied bypass modes. If configured for cycling operation, the fan
will cycle if the temperature is away from setpoint during the occupied,
occupied standby, and occupied bypass modes. During the unoccupied
mode, the fan cycles regardless of the fan configuration.

Compressor operation

The Tracer ZN517 supports heat pump applications with one or two com-
pressors. The compressor(s) will cycle to meet zone temperature require-
ments. Compressor operation will be overridden by a preset 3-minute
minimum on/off time delay in order to maintain oil return when the unit
is either initially energized, manually reset, switched between modes, or
cycled within a single mode.

Reversing valve operation

The reversing valve is configurable to energize in either the cooling mode
(typical of Trane units) or the heating mode. Be sure to configure the
reversing valve operation based on the heat pump manufacturer's design.
An energized valve will remain energized until a mode change (either
Heating or cooling mode
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