Startup
UNT-SVX07E-EN
111
Binary Outputs
Binary outputs are configured to support the following
(see
Table 55
):
•
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
The zone sensor, entering water temperature sensor, and
the discharge air sensor, and the outside air temperature
sensor are 10 K
Ω
thermistors. See
Figure 91
for the
resistance-temperature curve for these thermistors.
Table 55. 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
Table 56. Analog inputs (Tracer ZN520)
Description Terminals
Function
Range
Zone
TB3-1
Space
temperature input
5°F to 122°F
Ground
TB3-2
Analog ground
n/a
Set
TB3-3
Setpoint input
40°F to 115°F
Fan
B3-4
Fan switch input
4821 to 4919 W (off)
2297 to 2342 W (auto)
10593 to 10807 W
(low)
13177 to 13443 W
(medium)
15137 to 16463 W
(high)
Ground
TB3-6
Analog ground
n/a
Analog input 1
J3-1
Entering water
temperature
-40°F to 212°F
J3-2
Analog ground
n/a
Analog input 2
J3-3
Discharge air
temperature
-40°F to 212°F
J3-4
Analog ground
n/a
Analog input 3
J3-5
Fresh air temp/
generic temp
-40°F to 212°F
J3-6
Analog ground
n/a
Analog input 4
J3-7
Universal input
0% to 100%
Generic 4–20mA
0% to 100%
Humidity
0 to 2000 ppm
CO
2
J3-8
Analog ground
n/a
Ground
J3-9
Analog ground
n/a
Notes:
- 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.
Figure 91.
Resistance temperature curve for the zone
sensor, entering water temperature sensor,
and discharge air sensor