Engineering Documentation

Appendix A – Discontinued Products
Unitary Controller (UC)
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Wire Type Requirements
Unitary Controller Wire Type Requirements.
Circuit Type Class Wire Type (AWG) Distance Conduit Sharing
1
Input Power 2 Check local codes Check local codes Check local codes
Analog Input—RTD 2 No. 18 to No. 22TP 750 ft (228 m) Class 2
Analog Input—0-20 mA or 0-10
Vdc
2 No. 18 to No. 22 TP 750 ft (228 m) Class 2
Analog Output—0-12 Vdc or 0-
20 mA
2 No. 18 to No. 22 TP 750 ft (228 m) Check local codes
Digital Input 2 No. 18 to No. 22 TP 750 ft (228 m)
Class 1 and 2
Check local codes
Digital Output 1 No. 18 to No. 22 TP Check local codes Check local codes
Digital Output 2 Check local codes Check local codes Check local codes
1)
Conduit sharing rules were determined through EMI and shared conduit testing. These rules indicate wiring methods that have
no adverse affect on the proper operation of the equipment, but do not necessarily indicate compliance with local codes.
Power Source Requirements
UCs can be powered in three ways:
● Individual transformer using a transformer rated for Class 2 service.
● Power trunk. For more information, see the section Power Trunk Guidelines
[➙ 64].
● Low voltage source of a device that the UC is controlling (for example, electric-
pneumatic transducer, etc.).
CAUTION
The phase of all devices on a power trunk must be identical.
Phase differences can destroy equipment. Any relays, EPs, or contactors sharing
power must be clamped with MOVs at their locations.
UC Power Source Requirements.
Product Input Voltage Line Frequency Maximum Power
Unitary Controller 24 Vac 50/60 Hz 15.0 VA
1
1)
For standard UC package.
Digital Output (DO) Wiring
Table Unitary Controller Wire Type Requirements provides DO wire run lengths for
points wired to Unitary Controllers.
UL and CSA listing requires the DO wiring shield be installed in the cabinets for which
they are supplied.