Startup
104
UNT-SVX07E-EN
Binary Inputs
BIP1: Low Temperature Detection Option
The factory hard wires the low temperature detection
sensor to binary input #1 (BIP1). The sensor defaults
normally closed (N.C.), and will trip off the unit on a low
temperature diagnostic when detecting low temperature.
In addition, the controller controls the unit devices below:
•
Fan: Off
•
Valves: Open
•
Electric heat: Off
•
Damper: Closed
BIP2: Condensate Overflow Detection Option
The factory hard wires the condensate overflow sensor to
binary input #2 (BIP2). The sensor defaults normally
closed (N.C.), and will trip off the unit on a condensate
overflow diagnostic if condensate reaches the trip point. In
addition, the controller controls the unit devices below:
•
Fan: Off
•
Valves: Closed
•
Electric heat: Off
BIP3: Occupancy Sensor
Binary input #3 (BIP3) is available for field-wiring an
occupancy sensor, such as a binary switch or a timeclock,
to detect occupancy. The sensor can be either normally
open (N.O.) or normally closed (N.C.). Refer to
Table 44
.
Binary Outputs
Table 45
shows the six binary outputs.
Both Tracer ZN010 and ZN510 accept a maximum of five
analog inputs. See
Table 46
.
The zone sensor, entering water temperature sensor, and
the discharge air temperature sensor are 10 K
Ω
thermistors. See
Figure 90
for the resistance-temperature
curve for these thermistors.
Zone Sensors
The available zone sensors (see
“Zone Sensor Options,”
page 61
) provide up to three different inputs:
•
Space temperature measurement (10 K
Ω
thermistor)
•
Local setpoint
•
Fan mode switch
Wall-mounted zone sensors include a thermistor as a
component of the internal printed circuit board. Unit
mounted zone sensors use a sensor placed in the unit’s
return air stream.
Each zone sensor is equipped with a thumb wheel for
setpoint adjustment.
Fan Mode Switch
The zone sensor may be equipped with a fan mode switch.
The fan mode switch offers selections of off, low, medium,
high, or auto.
Table 44. Occupancy sensor state table
Sensor Type
Sensor Position
Unit Occupancy Mode
Normally open
Open
Occupied
Normally open
Closed
Unoccupied
Normally closed
Open
Unoccupied
Normally closed
Closed
Occupied
Table 45. Binary outputs
Binary output
Description
Pin
BOP1
Fan high speed
J1-1
BOP2
Fan medium speed
J1-2
BOP3
Fan low speed
J1-4
BOP4
1
Main valve
J1-5
BOP5
1
Auxiliary valve/electric heat
J1-6
BOP6
2
2-position fresh air damper
J1-7
Note:
1
In a four-pipe application, BOP4 is used for cooling and BOP5 is used
for heating. If no valves are ordered with the unit, the factory defaults
are:
- BOP4 configured as normally closed (N.C.)
- BOP5 configured as normally open (N.O.)
Note:
2
If the fresh air damper option is not ordered on the unit, BOP6 will
be configured as none.
Table 46. Analog inputs
Analog
Input
Description
Application
Zone
Space
temperature
Space temperature detection /
timed override detection
Set
Local setpoint
Thumbwheel setpoint
Fan
Fan mode input
Zone sensor fan switch
Analog input 1
(AI1)
Entering water
temperature
Entering water temperature
detection
Analog input 2
(AI2)
Discharge air
temperature
Discharge air temperature
detection
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 90.
Resistance temperature curve for the zone
sensor, entering water temperature sensor,
and discharge air sensor
