Trane HUV Installation, Operation And Maintenance Manual page 76

Startup
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 overflow
• Binary input 3: Occupancy/ Generic
• Binary input 4: Fan status
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.
Table 23. Binary input configurations (Tracer ZN520)
Binary
Input Description Configuration
Low temperature
BI 1 Normally closed Normal
(a)
detection
Condensate
BI 2 Normally closed Normal
(a)
overflow
BI 3 Occupancy Normally open
Generic binary
BI 3 Normally open
input
(a)
BI 4 Fan status Normally open
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.
(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.
(b) Table 24 shows the controller's response to low temperature detection,
condensate overflow, and fan status diagnostics.
(c) The generic binary input does not affect unit operation. A building au-
tomation system reads this input as a generic binary input.
(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.
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)
76
•
•
•
•
•
•
•
For more information, see
Table 24. Binary output configuration (Tracer ZN520)
Binary
Output
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
J1-9
J1-10
J1-11
J1-12
TB4-1
Controller Operation
TB4-2
Contact Contact
Closed Open
(b)
Diagnostic
(b)
Diagnostic
Unoccupied Occupied
(c) (c)
Normal Normal
(d)
Normal Diagnostic
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
Configuration
Fan high
Fan medium
Fan low
(Key)
Cool valve—open, or 2-position valve
Cool valve—close Note 1
Heat valve—open, or 2 position valve, or 1st electric heat
(a)
stage
Heat valve—close or 2nd Electric heat stage
Fresh air damper—open
Fresh air damper—close
Generic/baseboard heat output
24 Vac
(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).
Table 24.
(a)
(a)
UV-SVN02C-EN