Zone Sensors; Supply Fan Operation - Trane UniTrane Installation, Operation And Maintenance Instructions

Start-Up
Table 18. Analog inputs
Analog Input
Zone
Set
Fan
Analog input 1 (AI1)
Analog input 2 (AI2)
Notes:
1. 1.The zone sensor, entering water temperature sensor, and the discharge air temperature sensor are 10 KΩ thermistors.
2. Zone sensor:
3. Changeover units include an entering water temperature sensor.

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
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 19. Fan mode operation
Heating Mode
Fan mode
Off
Low
Medium
High
Auto
Continuous
Cycling off/heat default
Notes:
1. During the transition from off to any fan speed but high, Tracer ZN010 and ZN510 automatically starts the fan on high
2. When the heating output is controlled off, Tracer ZN010 and ZN510 automatically controls the fan on for an additional 30
88
Description
Space temperature
Local setpoint
Fan mode input
Entering water temperature
Discharge air temperature
Figure 28, p. 113 provides the resistance-temperature curve for these thermistors.
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.
Table 19 for fan mode operation. Tracer ZN010 and ZN510 will operate in either continuous
Occupied
Off
Low
Medium
High
Heat default
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.
seconds. This delay allows the fan to dissipate any residual heat from the heating source, such as electric heat.
Application
Space temperature detection
Thumbwheel setpoint
Zone sensor fan switch
Entering water temperature detection
Discharge air temperature detection
Cooling Mode
Unoccupied Occupied
Off Off
(a)
Off/high Low
(a)
Off/high Medium
(a)
Off/high High
(a)
Off/high Cool default
(a)
Off/high Off/cool default
Unoccupied
Off
(a)
Off/high
(a)
Off/high
(a)
Off/high
(a)
Off/high
(a)
Off/high
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