Trane UNT-SVX07A-EN manual sequence of, Operation operation, Analog Inputs, Zone Sensors

sequence of

Operation operation

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 (10KΩ 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.

Table O-SO-4. 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.The zone sensor, entering water temperature sensor, and the discharge air temperature sensor are 10KΩ thermistors. 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	occupied	unoccupied
off	off	off	off	off
low	low	off/high (3)	low	off/high (3)
medium	medium	off/high (3)	medium	off/high (3)
high	high	off/high (3)	high	off/high (3)
auto
continuous	heat default	off/high (3)	cool default	off/high (3)
cycling off/heat default		off/high (3)	off/cool 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	default setting	valid operating range
unoccupied cooling setpoint	85° F	40 to 115° F
occupied cooling setpoint	74° F	40 to 115° F
occupied heating setpoint	71° F	40 to 115° F
unoccupied heating setpoint	60° F	40 to 115° F
cooling setpoint high limit	110° F	40 to 115° F
cooling setpoint low limit	40° F	40 to 115° F
heating setpoint high limit	105° F	40 to 115° F
heating setpoint low limit	40° F	40 to 115° F
power-up control wait	0 sec	0 to 240 sec

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