Trane FC Installation & Operation Manual page 52

Analog Inputs
Both Tracer ZN010 and ZN510 accept a
maximum of five analog inputs.
Reference Table O-SO-4.
Zone Sensors
The zone sensors available with the
Tracer ZN010 and ZN510 provide up to
three different inputs
1. Space temperature measurement
(10K 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
Reference Table O-SO-5 for fan mode
operation. Reference Table O-SO-5 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.
52
Operation
Table O-SO-4. Analog inputs
analog input description
zone space temperature
set local setpoint
fan fan mode input
analog input 1 (AI1) entering water temperature
analog input 2 (AI2) discharge air temperature
Notes:
1.The zone sensor, entering water temperature sensor, and the discharge air temperature sensor are 10K
Figure 26 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 O-SO-5. Fan mode operation
heating mode cooling mode
fan mode occupied unoccupied
off off off
low low off/high (3)
medium medium off/high (3)
high high off/high (3)
auto
continuous heat default off/high (3)
cycling off/heat default off/high (3)
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.
3. 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 when there is a call for heating or cooling.
The heat default is factory configured for low fan speed, and the cool default is medium.
Table O-SO-6. Valid operating range and factory default setpoints
setpoint/parameter
unoccupied cooling setpoint
occupied cooling setpoint
occupied heating setpoint
unoccupied heating setpoint
cooling setpoint high limit
cooling setpoint low limit
heating setpoint high limit
heating setpoint low limit
power-up control wait
sequence of
operation
application
space temperature detection
thumbwheel setpoint
zone sensor fan switch
entering water temperature detection
discharge air temperature detection
occupied unoccupied
off off
low off/high (3)
medium off/high (3)
high off/high (3)
cool default off/high (3)
off/cool default off/high (3)
default setting valid operating range
85° F 40 to 115° F
74° F 40 to 115° F
71° F 40 to 115° F
60° F 40 to 115° F
110° F 40 to 115° F
40° F 40 to 115° F
105° F 40 to 115° F
40° F 40 to 115° F
0 sec 0 to 240 sec
thermistors.
UNT-SVX07A-EN