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Sequence of Operation Tracer ZN010 and ZN510 Note: this section applies only to units with a Tracer ZN010 or ZN510 controller. Power-UpSequence When 24 VAC power is initially applied to the Tracer ZN010 or ZN510, the following sequence occurs: 1. All outputs are controlled off. Tracer ZN010 and ZN510 reads all input values to detemine initial values. The random start time (0-25seconds) expires. Normal operation begins. Entering Water Temperature Sampling Function Both Tracer ZN010 and ZN510 use an entering water temperature sampling function to test for the correct water temperature for the unit operating mode.

For all applications not involving changeover, the water temperature does not affect unit operation. The entering water temperature sampling function opens the main hydronic valve, waits no more than three minutes to allow the water temperature to stabilize, then measures the entering water temperature to see if the correct water temperature is available.

The entering water must be five degrees or more above the space temperature to allow hydronic heating and five degrees or more below the space temperature to allow hydronic cooling. If the correct water temperature is available, the unit begins normal heating or cooling operation. If the measured entering water temperature is too low or high, the controller closes the valve and waits 60 minutes before attempting to sample the entering water. Reference Table O-SO-1. Binary Inputs BIP1: Low Temperature Detection Option The factory hard wires the low temperature detection sensor to binary input #1 (BIP1) on the Tracer ZN010 and ZN510. The sensor defaults normally closed (N.C.), and will trip off the unit on a low temperature diagnostic when detecting low temperature.

In addition, the Tracer ZN010 and ZN510 control unit devices as listed below: fan: off valves: open electric heat: off damper: closed Note: See the “Diagnostics” section for more information. BIP2: Condensate Overflow Detection Option The factory hard wires the condensate overflow sensor to binary input #2 (BIP2) on the Tracer ZN010 and ZN510. The sensor defaults normally closed (N.C.), and will trip off the unit on a condensate overflow diagnostic if condensate reaches the trip point.

In addition, the Tracer ZN010 and ZN510 control unit devices as listed below: fan: off valves: closed electric heat: off. BIP3: Occupancy Sensor Binary input #3 (BIP3) on Tracer ZN010 and ZN510 is available for fieldwiring an occupancy sensor, such as a binary switch or a timeclock, to detect occupancy. The sensor can be either normally open or normally closed. Reference Table O-SO-2. Binary Outputs Reference Table O-SO-3for the Tracer ZN010 and ZN510’s six binary outputs. Table O-SO-3.Binary outputs binary output description pin BOP1 fan high speed J1-1 BOP2 fan medium speed J1-2 BOP3 fan low speed J1-4 BOP4 main valve J1-5 BOP5 auxiliary valve/electric heat J1-6 BOP6 2-positionfresh air damper J1-7 Notes: 1.

In a four-pipeapplication, BOP4 is used for cooling and BOP5 is used for heating. If no valves are ordered with the unit, the factory default for the Tracer ZN010 and ZN510 controller are: BOP4 configured as normally closed BOP5 configured as normally open 3. If the fresh air damper option is not ordered on the unit, BOP6 will be configured as none.

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.

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Supply Fan Operation Reference Table O-SO-5for fan mode operation. Reference Table O-SO-5for fan mode operation.

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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-temperaturecurve for these thermistors. 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. 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. 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.

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-upcontrol wait 0 sec 0 to 240 sec. Tracer ZN520 Sequence of Operation The Tracer ZN520 operates the fan in the following modes: 1) occupied 2) unoccupied 3) occupied standby 4) occupied bypass 5) Tracer Summit with supply fan control Occupied When the controller is in the occupied mode, the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint, based on the measured space temperature, the discharge air temperature, the active setpoint, and the proportional/integral control algorithm. The modulating control algorithm used when occupied or in occupied standby is described in the following sections. Additional information related to the handling of the controller setpoints can be found in the previous Setpoint operation section.

Unoccupied Mode When the controller is in the unoccupied mode, the controller attempts to maintain the space temperature at the stored unoccupied heating or cooling setpoint, based on the measured space temperature, the active setpoint and the control algorithm, regardless of the presence of a hardwired or communicated setpoint. Similar to other configuration properties of the controller, the locally stored unoccupied setpoints can be modified using Rover™ service tool. In unoccupied mode, a simplified zone control algorithm is run. During the cooling mode, when the space temperature is above the cool setpoint, the primary cooling capacity operates at 100%. If more capacity is needed, the supplementary cooling capacity turns on (or opens to 100%).

During the heating mode, when the space temperature is below the heat setpoint, the primary heating capacity turns on. All capacity is turned off when the space temperature is between the unoccupied cooling and heating setpoints. Note that primary. Heating or cooling capacity is defined by unit type and whether heating or cooling is enabled or disabled. For example, if the economizer is enabled and possible, it will be the primary cooling capacity.

If hydronic heating is possible, it will be the primary heating capacity. Occupied Standby Mode The controller can be placed into the occupied standby mode when a communicated occupancy request is combined with the local (hardwired) occupancy binary input signal. When the communicated occupancy request is unoccupied, the occupancy binary input (if present) does not affect the controller’s occupancy. When the communicated occupancy request is occupied, the controller uses the local occupancy binary input to switch between the occupied and occupied standby modes. During occupied standby mode, the controller’s economizer damper position goes to the economizer standby minimum position. The economizer standby minimum position can be changed using Rover service tool.

In the occupied standby mode, the controller uses the occupied standby cooling and heating setpoints. Because the occupied standby setpoints typically cover a wider range than the occupied setpoints, the TracerZN520 controller reduces the demand for heating and cooling the space.

Also, the outdoor air economizer damper uses the economizer standby minimum position to reduce the heating and cooling demands. When no occupancy request is communicated, the occupancy binary input switches the controller’s operating mode between occupied and unoccupied. When no communicated occupancy request exists, the unit cannot switch to occupied standby mode. Occupied Bypass Mode The controller can be placed in occupied bypass mode by either communicating an occupancy request of Bypass to the controller or by using the timed override On button on the Trane zone sensor.

When the controller is in unoccupied mode, you can press the On button on the zone sensor to place the controller into occupied bypass mode for the duration of the bypass time (typically 120 minutes). Occupancy Sources There are four ways to control the controller’s occupancy:. Communicated request (usually provided by the building automation system or peer device). By pressing the zone sensor’s timed override On button. Occupancy binary input. Default operation of the controller (occupied mode) A communicated request from a building automation system or another peer controller can change the controller’s occupancy.

However, if communication is lost, the controller reverts to the default operating mode (occupied) after 15 minutes (configurable, specified by the “receive heartbeat time”), if no local hardwired occupancy signal exists. A communicated request can be provided to control the occupancy of the controller. Typically, the occupancy of the controller is determined by using time-of-day scheduling of the building automation system. The result of the time-of-dayschedule can then be communicated to the unit controller. Tracer Summit with Supply Fan Control If the unit is communicating with Tracer Summit and the supply fan control programming point is configured for Tracer (the factory configures as local), Tracer Summit will control the fan regardless of the fan mode switch position.

When the fan mode switch is set to Off or when power is restored to the unit, all Tracer ZN520 lockouts (latching diagnostics) are manually reset. The last diagnostic to occur is retained until the unit power is disconnected. Refer to Trane publication, CNT-SVX04A-EN Tracer ZN520 Installation Operation and Programming Guide, for specific instructions regarding the procedure for running the Tracer ZN520. Cooling Operation The heating and cooling setpoint high and low limits are always applied to the occupied and occupied standby setpoints. During the cooling mode, the TracerZN520 controller attempts to maintain the space temperature at the active cooling setpoint. Based on the controller’s occupancy mode, the active cooling setpoint is one of the following:.

Occupied cooling setpoint. Occupied standby cooling setpoint.

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Unoccupied cooling setpoint The controller uses the measured space temperature, the active cooling setpoint, and discharge air temperature along with the control algorithm to determine the requested cooling capacity of the unit (0-100%).The outputs are controlled based on the unit configuration and the required cooling capacity. To maintain space temperature control, the Tracer ZN520 cooling outputs (modulating hydronic valve, two-positionhydronic valve, or outdoor air economizer damper) are controlled based on the cooling capacity output. The cooling output is controlled based on the cooling capacity. At 0% capacity, all cooling capacities are off and the damper is at minimum position.

Between 0 and 100% capacity, the cooling outputs are controlled according to modulating valve logic (modulating valves) or cycled on (2-positionvalves). As the load increases, modulating outputs open further and binary outputs are energized longer. At 100% capacity, the cooling valve or damper is fully open (modulating valves) or on continuously (and 2- position valves). Unit diagnostics can affect fan operation, causing occupied and occupied standby fan operation to be defined as abnormal. Refer to the Troubleshooting section for more information about abnormal fan operation. The TracerZN520 controller operates the supply fan continuously when the controller is in the occupied and occupied standby modes, for either heating or cooling. The controller only cycles the fan off with heating and cooling capacity in the unoccupied mode.

The economizer is used for cooling purposes whenever the outdoor temperature is below the economizer enable setpoint and there is a need for cooling. The economizer is used first to meet the space demand, and other forms of cooling are used if the economizer cannot meet the demand alone. See modulating outdoor air damper operation for additional information. Cascade cooling control initiates a discharge air tempering function if the discharge air temperature falls below the discharge air temperature control low limit, all cooling capacity is at minimum, and the discharge control loop determines a need to raise the discharge air temperature. The controller then provides heating capacity to raise the discharge air temperature to its low limit. Discharge Air Tempering The discharge air tempering function enables when cold outdoor air is brought in through the outdoor air damper, causing the discharge air to fall below the discharge air temperature control low limit.

The controller exits the discharge air tempering function when heat capacity has been at 0% for five minutes. Heating Operation During heating mode, the TracerZN520 controller attempts to maintain the space temperature at the active heating setpoint. Based on the occupancy mode of the controller, the active heating setpoint is one of the following:. Occupied heating.

Occupied standby heating. Unoccupied heating During dehumidification in the heating mode, the controller adjusts the heating setpoint up to the cooling setpoint. This reduces the relative humidity in the space with a minimum of energy usage. The controller uses the measured space temperature, the active heating setpoint, and discharge air temperature, along with the control algorithm, to determine the requested heating capacity of the unit (0-100%).The outputs are controlled based on the unit configuration and the required heating capacity.

Unit diagnostics can affect the Tracer ZN520 controller operation, causing unit operation to be defined as abnormal. Refer to the Troubleshooting section for more information about abnormal unit operation. Service manual kia. The heating output is controlled based on the heating capacity. At 0% capacity, the heating output is off continuously.

Between 0 and 100% capacity, the heating output is controlled according to modulating valve logic (modulating valves) or cycled on (two-positionvalves). As the load increases, modulating outputs open further and binary outputs are energized longer. At 100% capacity, the heating valve is fully open (modulating valves) or on continuously (two-positionvalves).

The TracerZN520 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, medium, or low position, the fan runs continuously at the selected speed. Refer to the Troubleshooting section for more information on abnormal fan operation.

When the unit’s supply fan is set to auto, the controller’s configuration determines the fan speed when in the occupied mode or occupied standby mode. The fan runs continuously at the configured heating fan speed or cooling fan speed. For all fan speed selections except off, the fan cycles off during unoccupied mode. The economizer outdoor air damper is never used as a source of heating.

Instead, the economizer damper (when present) is only used for ventilation; therefore, the damper is at the occupied minimum position in the occupied mode. The damper control is primarily associated with occupied fan operation. Fan Mode Operation For multiple fan speed applications, the TracerZN520 controller offers additional fan configuration flexibility. Separate default fan speeds for heating and cooling modes can be configured. The fan runs continuously for requested speeds (off, high, medium, or low). When the fan mode switch is in the Auto position or a hardwired fan mode input does not exist, the fan operates at the default configured speed.

See Table 21 for default fan configuration for heat and cool mode. During unoccupied mode, the fan cycles between high speed and off with heating and cooling fan modes.

If the requested speed is off, the fan always remains off. During dehumidification, when the fan is on Auto, the fan speed can switch depending on the error. Fan speed increases as the space temperature rises above the active cooling setpoint.

Additional flexibility built into the controller allows you to enable or disable the local fan switch input. The fan mode request can be either hardwired or communicated to the controller. When both are present, the communicated request has priority over the hardwired input. See Tables 22, 23, and 24.

Table O-SO-7.Fan configuration auto fan fan speed operation default Heating continuous off low medium high Cooling continuous off low medium high. Table O-SO-8.Local fan switch enabled Communicated Fan switch (local) Fan operation fan speed input Off Ignored Off Low Ignored Low Medium Ignored Medium High Ignored High Auto Off Low Medium High Auto Off Low Medium High Auto (configured default, determined by heat/cool mode) Table O-SO-9.Fan operation in heating and cooling modes Heating Cooling Fan mode Occ. Off off off off off Low low off/high low off/high Medium med off/high med off/high High high off/high high off/high Auto default off/high default off/high fan sp. Table O-SO-10.Local fan switch disabled or not present Communicated fan speed input Fan operation Off Off Low Low Medium Medium High High Auto (or not present) Auto (fan runs at the default speed. Continuous Fan Operation During occupied and occupied standby modes, the fan normally is on.

For multiple speed fan applications, the fan normally operates at the selected or default speed (off, high, medium, or low). When fan mode is auto, the fan operates at the default fan speed. During unoccupied mode, the controller controls the fan off. While unoccupied, the controller heats and cools to maintain the unoccupied heating and cooling setpoints. In unoccupied mode, the fan is controlled on high speed only with heating or cooling. The unit fan is always off during occupied, occupied standby, and unoccupied modes when the unit is off due to a diagnostic or when the unit is in the off mode due to the local zone sensor module, a communicated request, or the default fan speed (off).

If both a zone sensor module and communicated request exist, the communicated request has priority. Fan Cycling Operation TracerZN520 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 ZN520 controller automatically holds the fan on for an additional 30 seconds. This 30-seconddelay gives the fan time 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. Table O-SO-11.Relationship between outdoor temperature sensors and damper position Outdoor Air Temp. Modulating Outdoor Air Damper occupied or occupied bypass occupied standby unoccupied none or invalid open to occupied minimum position open to occupied standby minimum position closed failed open to occupied minimum position open to occuied standby minimum position closed present and economizing feasible economizing minimum postion to 100% economizing between occupied standby open & economizing when minimum position to 100% unit is operating, closed otherwise present & economizing not feasible open to occupied minimum position open to occupied standby minimum position closed. Fan Start on High Speed On a transition from off to any other fan speed, the TracerZN520 controller automatically starts the fan on high speed and runs the fan at high speed for 0.5 seconds.

This provides the ample torque required to start all fan motors from the off position. Entering Water Temperature Sampling Function Only units using the main hydronic coil for both heating and cooling (2-pipechangeover and 4-pipechangeover units) use the entering water temperature sampling function. Two-pipechangeover and 4-pipechangeover applications allow the main coil to be used for heating and for cooling; therefore, these applications require an entering water temperature sensor. When three-wayvalves are ordered with a Tracer ZN520 control, the controller is factory-configuredto disable the entering water temperature sampling function, and the entering water sensor is mounted in the proper location. Disabling entering water temperature sampling eliminates unnecessary water flow through the main coil when three-wayvalves are used. The controller invokes entering water temperature sampling only when the measured entering water temperature is too cool to heat or too warm to cool. Entering water is cold enough to cool when it is five degrees below the measured space temperature.

Entering water is warm enough to heat when it is five degrees above the measured space temperature. When the controller invokes the entering water temperature sampling function, the unit opens the main hydronic valve for no more than three minutes before considering the measured entering water temperature.

An initial stabilization period is allowed to flush the coil. This period is equal to 30 seconds plus ½ the valve stroke time.

Once this temperature stabilization period has expired, the controller compares the entering water temperature against the effective space temperature (either hardwired or communicated) to determine whether the entering water can be used for the desired heating or cooling. If the water. Temperature is not usable for the desired mode, the controller continues to compare the entering water temperature against the effective space temperature for a maximum of three minutes. The controller automatically disables the entering water temperature sampling and closes the main hydronic valve when the measured entering water exceeds the high entering water temperature limit (110°F). When the entering water temperature is warmer than 110°F, the controller assumes the entering water temperature is hot because it is unlikely the coil would drift to a high temperature unless the actual loop temperature was very high.

If the entering water temperature is unusable — too cool to heat or too warm to cool — the controller closes the hydronic valve and waits 60 minutes before initializing another sampling. If the controller determines the entering water temperature is valid for heating or cooling, it resumes normal heating/ cooling control and effectively disables entering water temperature sampling until it is required. Electric Heat Operation The Tracer ZN520 controller supports one or two-stageelectric heat operation for heating. To control the space temperature, electric heat is cycled to control the discharge air temperature. The rate of cycling is dependent upon the load in the space and the temperature of the incoming fresh air from the economizer (if any). Two-pipechangeover units with electric heat use the electric heat only when hot water is not available.

Manual Fresh Air Damper Units with the manual fresh air damper option ship with the damper in the closed position, which is adjustable from zero to 100% in 25% increments. To adjust the position, first remove the air filter to expose the damper stop screw on the control panel end.

Relocate the stop screw to the appropriate position. Then loosen the stop screw wingnut and adjust the linkage. Economizer Damper Option With a valid outdoor air temperature (either hardwired or communicated), Tracer ZN520 uses the modulating economizer damper as the highest priority source of cooling.

Economizer operation is only possible through the use of a modulating damper. Economizing is possible during the occupied, occupied standby, unoccupied, and occupied bypass modes.

The controller initiates the economizer function if the outdoor air temperature is cold enough to be used as free cooling capacity. If the outdoor air temperature is less than the economizer enable setpoint (absolute dry bulb), the controller modulates the outdoor air damper (between the active minimum damper position and 100%) to control the amount of outdoor air cooling capacity. When the outdoor air temperature rises 5°F above the economizer enable point, the controller disables economizing and moves the outdoor air damper back to its predetermined minimum position based on the current occupancy mode or communicated minimum damper position. Dehumidification Dehumidification is possible when mechanical cooling is available, the heating capacity is located in the reheat position, and the space relative humidity setpoint is valid.The controller starts dehumidifying the space when the space humidity exceeds the humidity setpoint. The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity offset.The controller uses the cooling and reheat capacities simultaneously to dehumidify the space.

While dehumidifying, the discharge air temperature is controlled to maintain the space temperature at the current setpoint. A typical scenario involves high humidity and high temperature load of the space.The controller sets the cooling capacity to 100% and uses the reheat capacity to warm the discharge air to maintain space temperature control. Dehumidification may be disabled via Tracer or configuration. Note: If the unit is in the unoccupied mode, the dehumidification routine will not operate.

Data Sharing Because this controller utilizes LonWorks™ technology, the controller can send or receive data (setpoint, heat/ cool mode, fan request, space temperature, etc.) to and from other controllers on the communication link, with or without the existence of a building automation system. This applies to applications where multiple unit controllers share a single space temperature sensor (for rooms with multiple units but only one zone sensor) for both standalone (with communication wiring between units) and building automation system applications.

For this application you will need to use the Rover service tool. For more information on setup, refer to the Trane publication EMTX-IOP-2. Binary Inputs The Tracer ZN520 controller has four available binary inputs. See Table O-SO-12.

Normally, these inputs are factoryconfigured for the following functions:. Binary input 1: Low temperature detection (freezestat). Binary input 2: Condensate overflow. Binary input 3: Occupancy/ Generic.

Binary input 4: Fan status. Binary Outputs Binary outputs are configured to support the following:. Three fan stages (when one or two fan stages are present, medium fan speed can be configured as exhaust fan).

One hydronic cooling stage. One hydronic heating stage (dehumidification requires this to be in the reheat position). One DX cooling stage.

One or two-stageelectric heat (dehumidification requires this to be in the reheat position). Face and bypass damper. Modulating outdoor air damper. One baseboard heat stage For more information, see Table O-SO-13. Zone Sensor The TracerZN520 controller accepts the following zone sensor module inputs:. Space temperature measurement (10kΩ thermistor). Local setpoint (either internal or external on the zone sensor module).

Fan switch. Timed override (On) and Cancel timed override. Communication jack Space Temperature Measurement Trane zone sensors use a 10kW thermistor to measure the space temperature. Typically, zone sensors are wall-mountedin the room and include a space temperature thermistor. As an option, the zone sensor can be unitmounted with a separate space temperature thermistor located in the unit’s return air stream. If both a hardwired and communicated space temperature value exist, the controller ignores the hardwired space temperature input and uses the communicated value.

External Setpoint Adjustment Zone sensors with an external setpoint adjustment (1kΩ ) provide the Tracer ZN520 controller with a local setpoint (50 to 85°F or 10 to 29.4°C). The external setpoint is exposed on the zone sensor’s front cover. When the hardwired setpoint adjustment is used to determine the setpoints, all unit setpoints are calculated based on the hardwired setpoint value, the configured setpoints, and the active mode of the controller. The hardwired setpoint is used with the controller’s occupancy mode (occupied, occupied standby, or unoccupied), the heating or cooling mode, the temperature deadband values, and the heating and cooling setpoints (high and low limits) to determine the controller’s active setpoint. When a building automation system or other controller communicates a setpoint to the controller, the controller ignores the hardwired setpoint input and uses the communicated value. The exception is the unoccupied mode, when the controller always uses the stored default unoccupied setpoints.

After the controller completes all setpoint calculations, based on the requested setpoint, the occupancy. Mode, the heating and cooling mode, and other factors, the calculated setpoint is validated against the following setpoint limits:. Heating setpoint high limit. Heating setpoint low limit. Cooling setpoint high limit.

Cooling setpoint low limit These setpoint limits only apply to the occupied and occupied standby heating and cooling setpoints. These setpoint limits do not apply to the unoccupied heating and cooling setpoints stored in the controller’s configuration. When the controller is in unoccupied mode, it always uses the stored unoccupied heating and cooling setpoints.The unit can also be configured to enable or disable the local (hardwired) setpoint.

This parameter provides additional flexibility to allow you to apply communicated, hardwired, or default setpoints without making physical changes to the unit. Similar to hardwired setpoints, the effective setpoint value for a communicated setpoint is determined based on the stored default setpoints (which determines the occupied and occupied standby temperature deadbands) and the controller’s occupancy mode. Fan Switch The zone sensor fan switch provides the controller with an occupied (and occupied standby) fan request signal (Off, Low, Medium, High, Auto). If the fan control request is communicated to the controller, the controller ignores the hardwired fan switch input and uses the communicated value. The zone sensor fan switch input can be enabled or disabled through configuration using the Rover service tool. If the zone sensor switch is disabled, the controller resorts to its stored configuration default fan speeds for heating and cooling, unless the controller receives a communicated fan input.

When the fan switch is in the off position, the controller does not control any unit capacity. The unit remains powered and all outputs drive to the closed position. Upon a loss of signal on the fan speed input, the controller reports a diagnostic and reverts to using the default fan speed. On/Cancel Buttons Momentarily pressing the on button during unoccupied mode places the controller in occupied bypass mode for 120 minutes. You can adjust the number of minutes in the unit controller configuration using Rover service tool.

The controller remains in occupied bypass mode until the override time expires or until you press the Cancel button. Communication jack Use the RJ-11communication as the connection point from Rover™ service tool to the communication link — when the communication jack is wired to the communication link at the controller. By accessing the communication jack via Rover™, you can access any controller on the link. Communications TracerZN520 controller communicates via Trane’s LonTalk protocol. Typically, a communication link is applied between unit controllers and a building automation system. Communication also is possible via Rover, Trane’s service tool. Peer-to-peer communication across controllers is possible even when a building automation system is not present.

You do not need to observe polarity for LonTalk communication links. The controller provides six 0.25-inch quick-connectterminals for the LonTalk communication link connections, as follows:. Two terminals for communication to the board. Two terminals for communication from the board to the next unit (daisy chain). Two terminals for a connection from the zone sensor back to the controller Table O-SO-16.Zone sensor wiring connections TB1 description 1 space temperature 2 common 3 setpoint 4 fan mode 5 communications 6 communications.