UNT-SVX041D-EN
47
Installation - Controls
Tracer
®
UC400-B Controller
The Tracer
®
UC400-B single-zone VAV controller can be
used in a stand-alone application or as part of a Tracer
®
control system.
In the stand-alone configuration, Tracer
®
UC400-B
receives operation commands from the zone sensor and/
or the entering water temperature sensor (on auto
changeover units).The reading from the entering water
temperature sensor and determines if the unit is capable
of cooling or heating. The zone sensor module is capable
of transmitting the following information to the controller:
•
Timed override on/cancel request
•
Zone setpoint
•
Current zone temperature
•
Fan mode selection (off-auto-high-med-low)
For optimal system performance, units can operate as part
of a Tracer
®
SC building automation system. The
controller is linked directly to the Tracer
®
SC via a twisted
pair communication wire, requiring no additional
interface device (i.e., a command unit). The Tracer
®
control system can monitor or override Tracer
®
UC400-B
control points.This includes such points as temperature
and output positions.
Note:
For more detailed information, refer to:
•
BAS-SVX20*-EN
Tracer
®
UC400-B Programmable
Controller Installation, Operation, and Maintenance
manual
Communication Wire Specifications
All wiring must comply with the National Electrical Code
(NEC™)
and local electrical codes.
Field-supplied BACnet MS/TP link wiring must be installed
in compliance with NEC and local codes. The wire must be
low-capacitance, 18-gauge, stranded, tinned-copper,
shielded, twisted-pair.
Note:
For more details, refer to
Wiring Guide: Unit
Controller Wiring for the Tracer
®
SC System
Controller
(BAS-SVN03D-EN, or the most recent
revision).
General Wiring Guidelines
To connect wires to the UC400-B controller or the
expansion modules:
1. Strip the wires to expose 0.28 inch (7 mm) of bare wire.
2. Insert the wire into a terminal connector.
3. Tighten the terminal screw to 0.5 to 0.6 Nm (71 to
85 ozf-in or 4.4 to 5.3 lbf-in.).
4. Tug on the wires after tightening the screws to ensure
all wires are secure as shown on the right.
Setting the Address
The rotary address dials on the UC400-B controller serve
one or two purposes depending upon the network: they
are always used for the MAC Address, which is sometimes
all or part of the BACnet Device ID.
Use a 1/8 inch (3.2 mm) flathead screwdriver to set rotary
address dials. Dials rotate in either direction.
Figure 33.
Connecting wires to terminal
Figure 34.
Setting rotary address dials
1
4 P in AMP
B
O
4
B
O
5
2
4
V
A
C
G
N
D
B
O
6
B
O
7
B
I2
B
I2
B
I3
B
I3
A
I5
G
N
D
2
4
V
A
C
G
N
D
1 4 13 1 2 11 10 9 8
7 6 5
4
3
2 1
J
1 8
B
O
7
2
4
V
A
C
J
1 4 - J S T
B
O
6
0
5
3
8
0
5
3
8
1
5
3
8
0
1
5
3
8
0
Ad d re s s
4
P
in
P
h
o
e
n
ix
J
1 7
B
O
9
G
N
D
2
4
V
A
C
B
O
8
J
1 6
B
O
1
2
4
V
A
C
B
O
2
2
4
V
A
C
B
O
3
2
4
V
A
C
P ho e nix
P ho e nix
2
4VDC
G ND
Co m m +
Co m m -
J
8
B
A
C
n
e
t
4
P
in
P
h
o
e
n
ix
J
1
3
+
-
+
-
IM
C
J
1
2
-
A
M
P
J
1
1
-
A
M
P
+
-
G
n
d
2
4
V
D
C
1 2 3 4 5 6
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2 3
Entering
Water
Temp
Comm In
Comm Out
Auxiliary 24 Vdc
Output
Zone Sensor
Serv Tool
Connection
Low Coil
Detection
(NC)
Condensate
Over ow (NC)
