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VAV-SLM002-EN 7
Hardware Overview
Central Control Panel Enclosure
The new VariTrac Central Control Panel (CCP) has a three-piece
enclosure for simplified installation. All wiring is done on large, easily
accessible terminal strips located in the wall mount base plate. The
electronics are located in the middle section, which is snapped onto the
base plate after mounting. The top section is either a blank face plate, or
the optional operator display.
Central Control Panel Operator Display
The optional operator display (OD) is a back-lit liquid crystal display with
touch-screen programming capability. Through the display you can
access system status and zone status, and do basic set-up of the zone
UCMs and the CCP system operating parameters. It is designed to give
an installer the ability to commission a VariTrac system without requiring
a PC. Additionally, the OD has a seven-day time clock built in to provide
stand alone scheduling capability of the VariTrac system. Zones may be
divided into four groups, each with its own schedule if desired. If there is
no Tracker system on the job, the CCP must be ordered with a display.
If Tracker is available, the CCP may have a blank cover plate installed
instead of an OD. All set-up information for the CCP may then be
accessed from the Tracker.
Central Control Panel Optional Relay Board
The new relay board does not require any mounting hardware or time
consuming installation. It simply snaps into place. The terminal strip is
now internally jumpered, so it may be wired directly to an HVAC unit low
voltage terminal strip using the same terminal designations as an
industry standard thermostat subbase.
Communicating Sensor/Bypass Control Assembly
The VariTrac duct sensors have been combined with a UCM into one
factory-wired assembly, so it now resides on the Comm 4 link along with
the zone dampers and Voyager/Precedent™ rooftop unit. The bypass
damper is also wired to this assembly. This eliminates the multiple
conductors and terminations between the CCP, the duct sensors and the
bypass damper, where most installation errors occurred.
Bypass Damper Installation Harness
All bypass dampers will now be shipped with a 12-foot plenum-rated
wiring harness attached to the damper at the factory. The harness has a
polarized plug on the end which is plugged into the communicating
sensor assembly control board. This eliminates bypass damper wiring
errors during installation.