88 UNT-SVX07B-EN
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Zone Sensors
The zone sensors available with the Tracer ZN010 and ZN510 provide up to three different inputs
1. Space temperature measurement (10 KΩ thermistor)
2. Local setpoint
3. Fan mode switch
Wall-mounted zone sensors include a thermistor as a component of the internal printed circuit
board. Unit mounted zone sensors use a sensor placed in the unit’s return air stream.
Each zone sensor is equipped with a thumbwheel for setpoint adjustment.
Fan Mode Switch
The zone sensor may be equipped with a fan mode switch. The fan mode switch offers selections
of off, low, medium, high, or auto.
Supply Fan Operation
Refer to Tab le 19 for fan mode operation. Tracer ZN010 and ZN510 will operate in either continuous
fan or fan cycling mode. The fan cycles when the fan mode switch is placed in auto. The fan runs
continuous when placed in the high, medium, or low position. Use Rover, Trane’s installation and
service tool, to change auto defaults.
Table 18. Analog inputs
Analog Input Description Application
Zone Space temperature Space temperature detection
Set Local setpoint Thumbwheel setpoint
Fan Fan mode input Zone sensor fan switch
Analog input 1 (AI1) Entering water temperature Entering water temperature detection
Analog input 2 (AI2) Discharge air temperature Discharge air temperature detection
Notes:
1. 1.The zone sensor, entering water temperature sensor, and the discharge air temperature sensor are 10 KΩ thermistors.
Figure 28, p. 113 provides the resistance-temperature curve for these thermistors.
2. Zone sensor:
Wall-mounted sensors include a thermistor soldered to the sensor’s circuit board
Unit mounted sensors include a return air sensor in the unit’s return air stream.
3. Changeover units include an entering water temperature sensor.
Table 19. Fan mode operation
Heating Mode Cooling Mode
Fan mode Occupied Unoccupied Occupied Unoccupied
Off Off
Off Off Off
Low Low
Off/high
(a)
Low Off/high
(a)
Medium Medium Off/high
(a)
Medium 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/heat default Off/high
(a)
Off/cool default Off/high
(a)
Notes:
1. During the transition from off to any fan speed but high, Tracer ZN010 and ZN510 automatically starts the fan on high
speed and runs for three seconds 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, Tracer ZN010 and ZN510 automatically controls 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.
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