Installation and Maintenance Manual

Startup
90 UNT-SVX07D-EN
If the correct water temperature is available, the unit
begins normal heating or cooling operation. If the
measured entering water temperature is too low or high,
the controller closes the valve and waits 60 minutes before
attempting to sample the entering water. Refer to Tab le 19.
Binary Inputs (Tracer ZN010 and ZN510)
BIP1: Low Temperature Detection Option
(Tracer ZN010 and ZN510)
The factory hard wires the low temperature detection
sensor to binary input #1 (BIP1) on the Tracer ZN010 and
ZN510. 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 Tracer ZN010
and ZN510 control unit devices as listed below:
Fan: Off
Valves: Open
Electric heat: Off
Damper: Closed
Note: See “Diagnostics,” p. 112 for more information.
BIP2: Condensate Overflow Detection Option
(Tracer ZN010 and ZN510)
The factory hard wires the condensate overflow sensor to
binary input #2 (BIP2) on the Tracer ZN010 and ZN510. 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 Tracer ZN010 and
ZN510 control unit devices as listed below:
Fan: Off
Valves: Closed
Electric heat: Off
BIP3: Occupancy Sensor (Tracer ZN010 and
ZN510)
Binary input #3 (BIP3) on Tracer ZN010 and ZN510 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 or normally closed.
Refer to Table 20.
Binary Outputs (Tracer ZN010 and ZN510)
Refer to Table 21 for the six binary outputs of Tracer ZN010
and ZN510.
Both Tracer ZN010 and ZN510 accept a maximum of five
analog inputs. Refer to Table 22, p. 90.
Table 19. Unit mode as related to water temperature
Unit Type
EWT
Sensor
Required? Coil Water Temperature
2-pipe changeover Yes COOLS if: Space temp - EWT ≥ 5°F
HEATS if: EWT - space temp ≥ 5°F
4-pipe changeover Yes COOLS if: Space temp - EWT ≥ 5°F
HEATS if: EWT - space temp≥ 5°F
2-pipe heating only No Hot water assumed
2-pipe cooling only No Cold water assumed
4 pipe (2 pipe heat
and 2 pipe cool)
No Cold water assumed in main coil
Hot water assumed in aux. coil
Table 20. 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 21. 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 Main valve J1-5
BOP5 Auxiliary valve/electric heat J1-6
BOP6 2-position fresh air damper J1-7
Notes:
1. In a four-pipe application, BOP4 is used for cooling and BOP5 is used
for heating.
2. If no valves are ordered with the unit, the factory defaults for the
Tracer ZN010 and ZN510 controller are:
BOP4 configured as normally closed
BOP5 configured as normally open
3. If the fresh air damper option is not ordered on the unit, BOP6 will be
configured as none.
Table 22. 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:
1. 1.The zone sensor, entering water temperature sensor, and the
discharge air temperature sensor are 10 KΩ thermistors. Figure 43,
p. 117 provides the resistance-temperature curve for these
thermistors.
2. Zone sensor:
Wall-mounted sensors include a thermistor soldered to the sensor’s cir-
cuit board
Unit mounted sensors include a return air sensor in the unit’s return
air stream.
3. Changeover units include an entering water temperature sensor.
UNT-SVX07_-EN.book Page 90 Friday, April 27, 2012 9:40 AM