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Single and Dual
Compressor
Operation
Other Modes
Occupancy Operation
Unoccupied operation normally is
associated with evening hours when
the space is vacant. In unoccupied
mode, the controller always uses the
default unoccupied heating and
cooling setpoints stored in the
controller. As the unit goes
unoccupied, the compressors
ON
timers are ignored and the
compressors are disabled.
When ZN510 controls the space to
unoccupied mode, the occupant
may have the ability to request
timed override through the Trane
zone sensor’s
ON button. Based on
the controller or system setup, the
controller interprets the request and
initiates the occupied setpoint
operation. During a timed override,
the controller applies the occupied
heating and cooling setpoint, but
reports the effective occupancy
mode as occupied bypass mode. In
the occupied bypass mode, a
building automation system can
detect whether the occupancy mode
was overrode.
Morning Warm Up
The damper (field installed or for the
console product) remains closed
during morning warm up until the
space temperature is within two
degrees of the effective heating
setpoint. The 2-position outdoor air
damper normally is open during the
occupied mode when the controller
turns on the unit fan. The damper is
normally closed during:
z occupied mode when the fan is
OFF.
z warm up/cool down mode.
z occupied standby mode.
z unoccupied mode.
z certain diagnostic conditions.
ZN510 keeps the 2-position outside
air damper closed on a transition
from unoccupied mode to occupied
mode as part of the morning warm
up sequence.