14 VAV-SVX07B-EN
Wiring Installation
UC400 Controller Power Wiring
The following section provides wiring guidelines for powering the UC400 controller.
Guidelines
• Use 18 AWG copper wire (recommended) for power and connect to terminals XFRM 24 Vac and
.
• Use U.L. listed, Class 2 power transformer, 20.4 to 27.6 Vac (24 Vac nominal).
• Size the transformer to provide adequate power to the UC400 controller (24 VA maximum) and
outputs (maximum 12 VA for each binary output).
Important: A dedicated 24 Vac, Class 2 transformer is recommended to power the Tracer
UC400 controller. When powering multiple controllers from one transformer,
polarity must be maintained. Terminal 24 Vac is designated positive (+) and
terminal is negative (-) to the unit casing ground. It is important to include
power consumption in the calculations.
• The power consumption for cooling-only Series F Models (VariTrac™ and VariTrane™) is up to
28 VA. Refer to Table 3, p. 15 for information about calculating actual VA requirements.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
WARNING
Electrocution and Fire Hazards with Improperly Installed and Grounded
Field Wiring!
Improperly installed/grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid
these hazards, the user MUST follow requirements for field wiring installation and grounding
as described in NEC and local/state electrical codes. All field wiring MUST be performed by
qualified personnel. Failure to follow these requirements could result in death or serious injury.
NOTICE:
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of conductors. Failure to use copper
conductors could result in equipment damage.
To Next Page
Loading...
Need help?
General
