Installation and Maintenance Manual

VAV-SVX07A-EN 13
VAV Start Up/Check Out Procedure
Tracer UC400 Controller Power Wiring
Power 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 and grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid
these hazards, you MUST follow requirements for field wiring installation and grounding as
described in the National Electrical Codes (NEC) and your 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.
Use at a minimum 16 AWG for power wiring and connect to terminal XFRM 24 VAC and . The 24
VAC is required to power the Tracer UC400 controller and has an acceptable voltage tolerance of
19 to 30 VAC. Refer to Figure 4, p. 18 and Figure 5, p. 19 for the Tracer UC400 controller terminal
locations. Replace the control box cover after field wiring to prevent any electromagnetic
interference.
Note: A dedicated 24 VAC, 75VA NEC 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.
The power consumption for cooling only Series F Models (VariTrac and VariTrane) is 28 VA. To
determine the total Tracer UC400 controller power requirement, add the power consumption per
stage to the circuit board power requirement. For example, a Series F unit containing magnetic
contactors with three stages of reheat would consume 54 VA.
Table 4. VA for factory installed component
Style Volt Amps
F - Style Actuator: 4 VA
Air Valve Actuator C through E Style: 12 VA
Fan Power Fan Output: 6 VA
Hot Water Proportional: 4 VA
Hot Water 2 Position: 6.5 VA
Electric Heater Magnetic Contactor: 10 VA
Electric Heater Mercury Contactor: 12 VA
Note: VariTrane cooling only Series D and E models consume 20 VA (12 VA for the actuator and 8 VA for the board). The heating
output ratings remain the same. Refer to Figure 4, p. 18 and Figure 5, p. 19 for the Tracer UC400 controller terminal
locations and for wiring of output devices.