Trane UniTrane Fan-Coil & Force Flo Air Conditioners manual sequence of, Operation operation

Note 1

sequence of

Operation operation

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

Note: The generic binary input can be used with a Tracer Summit® building automation system only.

Each binary input default configuration (including normally open/closed) is set at the factory. However, you can configure each of the four binary inputs as normally open or normally closed. The controller will be set properly for each factory- supplied binary input end-device. When no device is connected to the input, configure the controller’s input as not used.

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-stage electric 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.

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 factory- configured 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

Table O-SO-12. Binary input configurations

binary			controller operation
input	description	configuration	contact closed	contact open
BI 1	low temperature detection Note 1	normally closed	normal	diagnostic Note 5
BI 2	condensate overflow Note 1	normally closed	normal	diagnostic Note 5
BI 3	occupancy	normally open	unoccupied	occupied
BI 3	generic binary input	normally open	normal Note 3	normal Note 3
BI 4	fan status Note 1	normally open	normal	diagnostic Note 4

Note 1 During low temperature, condensate overflow, and fan status diagnostics, the Tracer ZN520 control disables all normal unit operation of the fan, valves, and damper. Note 2The occupancy binary input is for standalone unit controllers as an occupied/unoccupied input. However, when the controller receives a communicated occupied/unoccupied request, the communicated request has priority over the hardwired input. Note 3 The generic binary input does not affect unit operation. A building automation system reads this input as a generic binary input. Note 4 If the fan mode input is in the off position or the controller is in the unoccupied mode with the fan off, the fan status input will be open. A diagnostic will not be generated when the controller commands the fan off. A diagnostic will only be generated if the fan status input does not close after one minute from energizing a fan output or any time the input is open for one minute. The controller waits up to one minute after energizing a fan output to allow the differential pressure to build up across the fan. Note 5 The table below shows the controller’s response to low temperature detection, condensate overflow, and fan status diagnostics.

Table O-SO-13. Binary output configuration

binary output	configuration
J1-1	fan high
J1-2	fan medium
J1-3	fan low
J1-4	(Key)
J1-5	cool valve – open, or 2-position valve Note 1
J1-6	cool valve – close Note 1
J1-9	heat valve – open, or 2 position valve, or 1st electric heat stage Note 1
J1-10	heat valve – close or 2nd Electric heat stage Note 1
J1-11	fresh air damper - open
J1-12	fresh air damper - close
TB4-1	generic / baseboard heat output
TB4-2	24VAC

For Tracer ZN520 units configured and applied as 2-pipe hydronic heat/cool changeover, terminals J1-5 and J1-6 are used to control the primary valve for both heating and cooling. For Tracer ZN520 units configured and applied as 2-pipe hydronic heat/cool changeover with electric heat, terminals J1-5 and J1-6 are used to control the primary valve (for both cooling and heating), and terminals J1-9 and J1-10 are used only for the electric heat stage. For those 2-pipe changeover units, electric heat will not be energized while the hydronic supply is hot (5° or more above the space temperature).

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