Connect Ucm Wiring - Trane VariTrac VAV-SVN03A-EN Installation Manual

Getting Started
24
Figure 11: Proper Damper Mounting Positions

Connect UCM Wiring

Connect the power to terminals TB1-1 (24V) and TB1-2 (ground). 24 Vac is
required to power the UCM control. 20 Vac to 28 Vac is acceptable. Use 18 to
20 AWG for power wiring.
The power consumption for an auto-changeover cooling-only UCM (model
CHGR) is 10VA.
Local heat outputs are rated at 10VA maximum for each output. To
determine the total UCM power requirements, add the power consumption
of local heat to the circuit board power.
‹
CAUTION
Use wires with copper conductors only. The use of aluminum or other
types of wire may result in overheating and equipment damage.
‹
CAUTION
Connecting a shared UCM power supply with reversed polarity will cause
damage to the UCM, TCI, and central control panel.
‹
CAUTION
When powering multiple UCMs from one transformer, polarity must be
maintained. Terminal TB1-1 is designated positive (+) and Terminal TB1-2 is
negative (–) to unit casing ground.
IMPORTANT
UCM control box cover must be replaced after field wiring to prevent
electromagnetic interference.
VAV-SVN03A-EN