30 CNT-SVX11A-EN
Unit Operation
PRE
-COOL
The Tracer ZN524 controller keeps the
2-position outdoor air damper closed
for up to one hour at every transition
from unoccupied to occupied mode
when the space temperature is 3°F or
more above the cooling setpoint.
The damper remains closed during pre-
cool until the space temperature is
within 2°F of the effective cooling set-
point. The unit runs at full capacity until
setpoint is met.
Output Overrides
Manual Output Test
Manual output test allows the binary
outputs to be energized in a predefined
sequence. (For more information see,
Manual Output Test, on pages 32-33 for
more information.)
Fan Status
There are two ways to do fan status
monitoring:
1. The status of the fan is reported
based on the state of the binary out
put(s) dedicated to fan control. The
fan status is reported as
ON
whenever the corresponding binary
output is directed on. The fan status is
reported as off when the fan
output is directed
ON.
2. The Tracer ZN524 controller has a
binary input available for a fan status
device (current sensing relay) which
can provide feedback of fan
operation. If the device does not
indicate fan operation after 1 minute
as commanded
ON, a unit shut down
is initiated, and the unit is latched
OFF.
Filter Status/Maintenance Timer
The unit filter status\maintenance timer
is based on the cumulative run hours of
the unit fan. The controller compares
the fan run time against an adjustable
fan run hour limit and recommends
unit maintenance as required.
The Rover service tool is used to edit
the maintenance required setpoint
time. Once the setpoint limit is exceed-
ed, the controller generates a mainte-
nance required informational diagnos-
tic. When the
MAINTENANCE REQUIRED set-
point time is set to zero, the controller
disables this feature.
The Tracer Summit, Tracker or the Rover
service tool are required to clear the
MAINTENANCE REQUIRED
informational
diagnostic. Once the diagnostic is
cleared, the controller resets the fan
run time to zero and begins accumulat-
ing fan run hours again.
Note: If at any time the unit loses
power, the timer is reset to zero.
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