Johnson Controls UNT110-1 User Manual

UNT Controller—Unitary (UNT) Controller
41
You may use one sensor as a master input to multiple UNTs, instead of
mounting and wiring separate Zone Sensors for each controller. This
application is especially beneficial when you have a mechanical system
that uses more than one terminal unit to serve the same area; for example,
a classroom with two unit ventilators, or an open office space with
multiple water source heat pumps.
Figure 19 shows the wiring and analog input switch settings for
two controllers using one Zone Sensor. When sharing a sensor, both
controllers must be set to the same temperature sensor type (the default is
resistive nickel) on the HVAC PRO for Windows Analog Input Modify
screen. To ensure the noise immunity of the UNTs, pull the N2 Bus wiring
with the sensor wiring between controllers that share the same sensor.
1 2 3 4 5 6
1 2 3 4 5 6 7 8
BI NARY I NANALOG INPUTS BI NARY OUTPUTS
TM
BI NARY I NPUTANALOG INPUTS
1 2 3 4 5 6 1 2 3 4
ANALOG I NPUTS
COMMON
+15VDC
TO
ZON E
STAT
BI NARY OUTPUT
24VA C
1 2 3 4 5 6
+15VDC
24VAC
COMMON COMMON
REF
N2-
N2+
24VAC
CO M
ZBU S
Z BUS
DSI
7 8
TRACS
24 VAC
1 2 3 4 5 6
COMMON COMMON COMMON
1 2 3 4 5 6
1 2 3 4 5 6 7 8
BI NARY I NANALOG INPUTS BI NARY OUTPUTS
TM
BI NARY I NPUTANALOG INPUTS
1 2 3 4 5 6 1 2 3 4
ANALOG I NPUTS
COMMON
+15 VD C
TO
ZON E
STAT
BI NARY OUTPUT
24VAC
1 2 3 4 5 6
+15 VD C
24VAC
COMMON
COMMON
REF
N2-
N2 +
24VAC
COM
ZBUS
Z BUS
DSI
7 8
TRACS
24 VAC
1 2 3 4 5 6
COMMON COMMON
COMMON
Me ta st at
sensor
Set for
2 VDC and
Temperature
8-pin Connectio
n
on Back
Set for
2 VDC and
Voltage
Note: Route sensor wiring and N2 wiring together.
Since the UNT Controller is a self-terminating device,
end-of-line termination for the N2 Bus is not required.
Sensor +
Sensor -
N2 +
N2 -
N2 REF
1 2 3 4 5 6
O
N
1 2 3 4 5 6
O
N
10 V
2 V
T
V
1 2 3 4 5 6
O
N
1 2 3 4 5 6
O
N
10 V
2 V
T
V
Set the HVAC PRO for Windows software for both controllers for the temperature sensor used.
Figure 19: Example of Sharing a Sensor Among UNT Controllers
!
CAUTION: Multiple controllers sharing a sensor may only have
one single earth ground connection among them.
Even if separate transformers are used, only one may
be physically tied to earth ground and that connection
must be at the transformer secondary common.
Sharing a Sensor

Johnson Controls UNT110-1 Specifications

General

Brand	Johnson Controls
Model	UNT110-1
Category	Controller
Language	English