Installation Instructions

Document No. 550-696
Installation Instructions
Rev. 1, May, 2002
Page 4 of 9
Siemens Building Technologies, Inc.
Terminal Designations
Figure 4 shows the LTEC wiring designations and
internal jumper locations for both controllers.
NOTE: All inputs and outputs physical connections are
pre-configured per application number
selected.
The wiring diagrams (Figure 5 through
Figure 8) are shown using the full point
controllers (shaded terminals). Reduced point
controllers should be used when the additional
input/output points are not required.
LON0018R2
1
2
3
4
5
6
AI/DI 1
AI/DI 2
5V
+
-
5V
+
-
1
2
3
4
5
6
7
+
-
+
-
5V
+
-
AI/DI 3
AI/DI 5
J4
J13
J12
J6
AI/DI 4
Figure 4. Terminal Designations.
Input Ports
LTECs have configurable, flexible input ports. Table 1
lists each input port and indicates the input options
available for that port.
NOTE: Some models have only the first four inputs,
while others have five inputs. (Only VAV
models have the integral flow sensor port).
Table 1. LTEC Input Port Configuration Options.
Input Type/Number Configurable Options Notes
RJ-11 input jack Temperature sensor
Setpoint adjustment
Override button
550-180 through 187 wall modules
AI/DI 1 Digital Input
Temperature Input
100K thermistor
AI/DI 2 Digital Input
Temperature Input
100K thermistor
AI/DI 3 Digital Input
Percent Input
Temperature transmitter
0-10Vdc or
0-20/4-20 mA
AI/DI 4 Digital Input
Percent Input
Temperature transmitter
0-10Vdc or
0-20/4-20 mA
AI/DI 5 Digital Input
Percent Input
Temperature transmitter
0-10Vdc or
0-20/4-20 mA
Integral Flow Sensor n/a VAV/CV only