Filter
Top Products
54 BCXC-SVX01B-EN
Start-Up
Fan Cycling Operation
Tracer™ ZN520 does not support fan cycling in occupied mode. The fan cycles between high speed
and off in the unoccupied mode only. The controller’s cascade control algorithm requires
continuous fan operation in the occupied mode.
Fan Off Delay
When a heating output is controlled off, the Tracer™ ZN controller automatically holds the fan on
for an additional 30 seconds. This 30-second delay allows the fan to blow off any residual heat from
the heating source, such as a steam coil. When the unit is heating, the fan off delay is normally
applied to control the fan; otherwise, the fan off delay does not apply.
Fan Start on High Speed
On a transition from off to any other fan speed, the Tracer™ ZN controller automatically starts the
fan on high speed and runs the fan at high speed for 0.5 seconds. This provides ample torque
required to start all fan motors from the off position.
Fan Operation During Occupied Heating Modes
The ZN520 fan output(s) normally run continuously during the occupied and occupied standby
modes, but cycle between high and off speeds with heating/cooling during the unoccupied mode.
When in the occupied mode or occupied standby mode and the fan speed is set at the high or low
position, the fan runs continuously at the selected speed. Refer to “Troubleshooting,” p. 72 for more
information on abnormal fan operation.
Table 21. Fan mode operation, Tracer ZN010 and ZN510
Fan mode
Heating mode Cooling mode
Occupied Unoccupied Occupied Unoccupied
Off Off Off Off Off
Low Low Off/high
(a)
(a)Whenever two states are listed for the fan, the first state (off) applies when there is not a call for heating or cooling. The
second state (varies) applies where there is a call for heating or cooling. The heat default is factory-configured for low fan
speed, and the cool default is high.
Low Off/high
(a)
High High Off/high
(a)
High Off/high
(a)
Auto continuous Heat default Off/high
(a)
Cool default Off/high
(a)
Cycling off Off/heat default
(a)
Off/high
(a)
Off/cool default
(a)
Off/high
(a)
Notes:
1. During the transition from off to any fan speed but high, Tracer™ ZN010 and ZN510 automatically start the fan on high
speed and run for one-half of a second before transitioning to the selected speed (if it is other than high). This provides
enough torque to start all fan motors from the off position.
2. When the heating output is controlled off, ZN010 and ZN510 automatically control the fan on for an additional 30
seconds. This delay allows the fan to dissipate any residual heat from the heating source, such as electric heat.
Table 22. Valid operating range and factor default setpoints, Tracer ZN010 and ZN510
Setpoint/parameter Default setting Valid operating range
Unoccupied cooling setpoint 85°F 40°F–115°F
Occupied cooling setpoint 74°F 40°F–115°F
Occupied heating setpoint 71°F 40°F–115°F
Unoccupied heating setpoint 60°F 40°F–115°F
Cooling setpoint high limit 110°F 40°F–115°F
Cooling setpoint low limit 40°F 40°F–115°F
Heating setpoint high limit 105°F 40°F–115°F
Heating setpoint low limit 40°F 40°F–115°F
Power up control wait 0 sec 0 sec–240 sec