VAV-SVN03A-EN
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System Start-Up
and Checkout
Pre-power-Up Checkout
Central Control Panel
• Measure the supply voltage to the CCP TB2-1 and TB2-2. The supply
voltage should be between 20 Vac and 30 Vac.
• Assure that a reliable ground is attached to TB2-3 on the CCP.
• Check the UCM communication link to assure that the wire designated (+)
is connected to the TB2-10 and the wire designated (–) is terminated at the
TB2-11. The shield must be connected to TB2-12.
WARNING
The following test should not be performed until all people and equipment
are clear of the air conditioning unit.
If the air handling unit is controlled by the optional field installed relay
board, check the operation of the supply fan and heating and cooling stages
by jumping the appropriate terminals of the binary output terminal block
TB1. This check assures that the wires are properly terminated at the CCP
and that the air conditioning unit is operational.
UCM
• Verify that the damper is installed with the drive shaft horizontal. See the
Installation and Wiring section of this manual for more details.
• Check to assure that all mounting screws are a minimum of three inches
away from the center damper bead if hanging straps are used. This allows
full rotation of the damper.
• Check the supply voltage at TB1-1 and TB1-2. Polarity is important. Notice
that TB1-1 is designated 24V and TB1-2 is designated ground to unit casing
ground. The acceptable voltage present is 20 Vac to 28 Vac.
CAUTION
Connecting a shared UCM power supply with reversed polarity will cause
damage to the UCM, TCI, and Central Control Panel.
When powering multiple UCMs from one transformer, polarity must be
maintained. Terminal TB1-1 is designated 24V and Terminal TB1-2 is GND to
unit casing ground.
• Verify that communications wiring is terminated at TB2-1 (+) and TB2-2 (–).
Polarity is important.
• Verify that zone sensor connections are correct as detailed in the Installa-
tion and Wiring section of this manual.
