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Table Of Contents

Low Flow Dual Duct VAV/CV

with QVM

Application Data Sheet

Figure 1. Dual Duct VAV Box with Two Inlet Flow

Sensors.

Figure 2. Dual Duct VAV Box with One Inlet and One

Discharge Flow Sensor.

NOTE: The

source temperature sensor can be mounted in either hot or cold depending upon application usage.

Features

• Flow sensors can be installed in cold duct and hot duct, or cold duct and discharge duct.

• Operates dual cold/dual hot sequence, when both supply ducts use same temperature air.

• Application control of zone lighting reduces installation costs and provides energy savings.

• Advanced PID control minimizes offset and maintains tight setpoint control.

• Unique damper logic minimizes damper repositions, extending life of actuators.

• Standby mode enables energy savings during occupied hours for rooms that are not always used.

When occupants are sensed, the controller quickly responds to maintain comfort levels.

• Diversity control, through a demand limit input, maximizes comfort by maintaining even air distribution

to all zones during morning warm-up or pre-cool operation.

Document No. 588-023 January 2009

Summary of content (13 pages)

PAGE 1
Low Flow Dual Duct VAV/CV with QVM Application Data Sheet Figure 1. Dual Duct VAV Box with Two Inlet Flow Figure 2. Dual Duct VAV Box with One Inlet and One Sensors. Discharge Flow Sensor. NOTE: The source temperature sensor can be mounted in either hot or cold depending upon application usage. Features • Flow sensors can be installed in cold duct and hot duct, or cold duct and discharge duct. • Operates dual cold/dual hot sequence, when both supply ducts use same temperature air.
PAGE 2
Sequence of Operation This application example describes the operation of the Predator VAV dual duct terminal unit controller with two inlet flow sensors and optional lighting control. The Predator monitors the room temperature, room setpoint, room override switch, and supply airflow. As the monitored conditions change, the control algorithm modulates the damper actuators and the perimeter heating valve to maintain the specified room setpoints.
PAGE 3
The operation of the application when the space temperature is between the heating and cooling temperature setpoints is configurable. By default, the controller performs a distinct switchover between minimum heating and minimum cooling conditions. If configured, the controller can perform a crossover process where the flow setpoints are gradually adjusted according to the space temperature between the heating and cooling setpoints. Unoccupied Control Figure 5. Unoccupied Control.
PAGE 4
Dual Cold In this mode, the air handler supplies both ducts with cold air. If the dual supply sequence is configured for series operation, the cold duct will supply air until it reaches its maximum. If additional cooling is necessary, the hot duct will begin to supply air. If the dual supply sequence is configured for parallel operation, the flow setpoints for both ducts will increase at the same time. Figure 6. Dual Cold Serial Flow Configuration. Figure 7. Dual Cold Parallel Flow Configuration.
PAGE 5
Morning Warm-up/ Pre-Cool In these pre-occupancy modes, the Predator Controller controls the space temperature to the occupied temperature setpoint using the unoccupied flow ranges. The perimeter heat operation is configurable in Warm-up Mode. Systems that have been sized for normal operation may sometimes fall below the total maximum flow needs during morning warm-up (or pre-cool) operation. The demand limit input provides for stable start up.
PAGE 6
Bypass Mode If enabled (through StatSwitchEn) and the Bypass button on the Predator room sensor is pressed, the controller will be placed in the Bypass Mode for the amount of time specified by the controller’s configuration parameters (default 60 min. – see Table 2). If the button is subsequently pressed again prior to the expiration of the bypass time, the timer will reset to the initial value and resume counting down.
PAGE 7
Perimeter Heat This application also supports the optional control of perimeter heat. The algorithm supports analog, three-point floating, pulse width modulation, and on/off control of the perimeter heat. Perimeter heat operates independently of terminal airflow. Hardware Map – Dual Duct VAV/CV Table 1. Hardware Map.
PAGE 8
Wiring Diagram Optional dmp mtr Optional dmp mtr2 Not available violet red orange Optional Source Temp Y1 (CW) G (SP) Y2 (CCW) Y1 (CW) G (SP) Y2 (CCW) Siemens GDE131.1P 3-pt floating actuator Siemens GDE131.1P 3-pt floating actuator 2 4.7k ohm resistor Optional Wall Switch Y1 (CW) G (SP) Y2 (CCW) 4.
PAGE 9
Bill of Materials D SSEN0352R1 I Tag Description A Predator Dual Duct Controller 6IN, 8DO, 3AO, 1RTS Predator Full Point Wiring Base Predator Room Sensors: Sensing Only Override Setpoint Temperature Display Setpoint and Override Override and Temperature Display Setpoint and Temperature Display Setpoint, Override, and Temperature Display Predator Room Sensors without Logo’s: No Logo Sensing Only No Logo Setpoint No Logo Setpoint and Override No Logo Setpoint, Override, and Temperature Display Predator
PAGE 10
Configuration Tables The application configuration tables below are for a typical two sensor dual duct box. JDE should be used to modify those items shown as optional or job specific. Table 2. QVM Dual Duct Box Application Application-Specific Parameters.
PAGE 11
Table 2. QVM Dual Duct Box Application Application-Specific Parameters, Continued Application Component Perimeter Heat VAV CV Configuration Item Element hStageCyc htgSwitMeth numPerimStgs perimHUnocc perimHWrmup perimHtgCoil perimHtgMtr Source State and Temp sourceTempLim Factory Setting Enable DmdAtMin DmdAtMax TravelTime Reverse NeededToCool NeededToHeat sourceTempLoc Desired Setting 10 minutes DEAD_BAND 0 MODULATE CYCLE FALSE 0% 100% 125 seconds FALSE 64.4°F (18.0°C) 77.0°F (25.
PAGE 12
Table 4. QVM Dual Duct Box - Tuning Parameters Configuration Parameter clgDmdCtrB htgDmdCtrB trmFlowCtrB trmFlowHtCtrB Element Pb Ti Td Pb Ti Td Pb Ti Td Pb Ti Td Factory Setting Desired Setting (5.00°F) 2.78°C 2000 sec 0 sec (10.0°F) 5.
PAGE 13
Notice: Information in this document is based on specifications believed correct at the time of publication. The right is reserved to make changes as design improvements are introduced. Credits: Predator, and TALON are registered trademarks of Siemens Building Technologies, Inc. Niagara Framework is a registered trademark of Tridium, Inc. Other products and company names herein may be the trademarks of their respective owners. Siemens Building Technologies, Inc.