Installation and Maintenance Manual

Startup
76 UV-SVN02C-EN
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-SVX01G-EN (Rover Service Tool:
Installation, Operation, and Programming Guide), or the
most recent version.
Binary Inputs (Tracer ZN520)
The Tracer ZN520 controller has four available binary
inputs (see Table 23). Normally, these inputs are factory-
configured for the following functions:
• Binary input 1: Low temperature detection (freezestat)
• Binary input 2: Condensate o
verflow
• Binary input 3: Occup
ancy/ Generic
• Binary input 4: Fan status
Note: Th
e 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 (Tracer ZN520)
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 (deh
umidification requires
this to be in the reheat position)
• One DX cooling stage
• One or two-stage electric heat (dehumidification
req
uires this to be in the reheat position)
• Face and bypass damper
• Modulating outdoor air damper
• One baseboard heat stage
For more information, see T
able 24.
Table 23. Binary input configurations (Tracer ZN520)
Binary
Input Description Configuration
Controller Operation
Contact
Closed
Contact
Open
BI 1
Low temperature
detection
(a)
(a) During low temperature, condensate overflow, and fan status diagnos-
tics, the Tracer ZN520 control disables all normal unit operation of the
fan, valves, and damper.
Normally closed Normal Diagnostic
(b)
(b)Table 24 shows the controller’s response to low temperature detection,
condensate overflow, and fan status diagnostics.
BI 2
Condensate
overflow
(a)
Normally closed Normal Diagnostic
(b)
BI 3 Occupancy Normally open Unoccupied Occupied
BI 3
Generic binary
input
Normally open Normal
(c)
(c) The generic binary input does not affect unit operation. A building au-
tomation system reads this input as a generic binary input.
Normal
(c)
BI 4 Fan status
(a)
N o r m a l l y o p e n N o r m a l D i a g n o s t i c
(d)
(d)If the fan mode input is in the off position or the controller is in the un-
occupied mode with the fan off, the fan status input will be open. A di-
agnostic 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 en-
ergizing a fan output to allow the differential pressure to build up across
the fan.
Note: 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 hard-wired input.
Table 24. Binary output configuration (Tracer ZN520)
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
(a)
(a) 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 pri-
mary valve for both heating and cooling. For Tracer ZN520 units con-
figured 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).
J1-6 Cool valve—close Note 1
J1-9
Heat valve—open, or 2 position valve, or 1st electric heat
stage
(a)
J1-10 Heat valve—close or 2nd Electric heat stage
(a)
J1-11 Fresh air damper—open
J1-12 Fresh air damper—close
TB4-1 Generic/baseboard heat output
TB4-2 24 Vac
UV-SVN02_-EN.book Page 76 Thursday, January 24, 2013 4:48 PM