Carrier TruVu VVTBP-E2, Installation And Startup Manual

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Sequence of operation
TruVu™ VVTBP -E2 ©2022 Carrier.
Installation and Start-up Guide All rights reserved.
42
Equipment fan off detection
The TV-VVTBP-E2 continuously monitors its damper's position and the supply duct static pressure. If the pressure
drops below 10% of the nominal setpoint and the bypass damper is fully closed (or VFD is commanded to
maximum speed), after 1 minute the controller assumes that the equipment fan turned off. The bypass damper
then modulates to 65% open and the VFD speed is commanded to 35% (3.5 volts) to facilitate a fan restart. The
controller monitors the static pressure to determine when the equipment fan restarts. If it rises above 10% of the
nominal pressure setpoint, the controller assumes the fan restarted and controls to maintain the duct static
pressure setpoint. If Linkage is active, the air source mode is provided to the TV-VVTBP-E2.
Supply Air Temperature Alarm
The TV-VVTBP-E2 generates an alarm if the supply air temperature remains above the configured Maximum
Heating SAT or below the configured Minimum Cooling SAT for more than 5 minutes.
Airside linkage
When the TV-VVTBP-E2 is part of a linked system, it uses data received through Linkage (equipment SAT and
mode) to detect excessive leaving air temperature (LAT) conditions at the equipment and equipment operating
mode.