Metasys UNT Series, Technical Manual

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UNT Controller—Unitary Controller (UNT) 29
Table 8: UNT140/141 Terminal Identification
Terminal Description
AI1 Analog Input 1
A COM Analog Input Common
AI2 Analog Input 2
AI3 Analog Input 3
A COM Analog Input Common
AI4 Analog Input 4
AI5 Analog Input 5
A COM Analog Input Common
AI6 Analog Input 6
+15 VDC +15 Volts DC Supply
BI1 Binary Input 1
24 VAC 24 Volts AC
BI2 Binary Input 2
BI3
Binary Input 3
24 VAC
24 Volts AC
BI4
Binary Input 4
TRIAC Shared Triacs Node
BO1 Binary Output 1
RTN Return (24 VAC or Common)*
BO2 Binary Output 2
BO3 Binary Output 3
RTN Return (24 VAC or Common)*
BO4 Binary Output 4
BO5 Binary Output 5
RTN Return (24 VAC or Common)*
BO6 Binary Output 6
BO7 or AO1 Binary Output 7 or Analog Output 1
RTN or A COM Return (24 VAC or Common)* or Analog Output Common
BO8 or AO2 Binary Output 8 or Analog Output 2
24 VAC 24 VAC Power--Transformer High Side
COM Common--Transformer Low Side
Z Bus Zone Bus
REF N2 Reference
N2- N2 Bus -
N2+ N2 Bus +
* Depends on triac switching jumper setting: If high, return is “Common.”
If low, return is “24 VAC.”