Trane UniTrane FC, Installation & Operation Manual

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UNT-SVX07A-EN 57
Operation
sequence of
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
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 2 The 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 1
st
electric heat stage
Note 1
J1-10 heat valve – close or 2
nd
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
Note 1 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).
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.