Equipment Fan Off Detection; Supply Air Temperature Alarm; Airside Linkage - Carrier TruVu VVTBP-E2 Installation And Startup Manual

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Sequence of operation

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.

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.

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.

TruVu™ VVTBP-E2

Installation and Start-up Guide

Table of Contents

Tv-vvtbp-e2