This document should be used in conjunction with the VAV Start-up document (A6V10665935) and the "Application Help" in ABT Site. Application Help describes application types installed in the ABT Site library and lists all configuration items found in a specific template or type.

How to find Application help in ABT Site
To understand how to access Application Help, click the Help button in ABT Site and go to Configuration > Application configuration. (see "Title and toolbar")

Templates
This application template is factory preloaded into the DXR2 automation station, or it can also be manually loaded using ABT Site. A template can be used as a starting point for the creation of other similar templates, using ABT-Site. Changing or adjusting parameters and setpoint values does not require a new template number, but if a physical input or output is changed, a new 5-digit template number should be assigned.

Application parameters and settings can be modified to meet specific jobsite requirements such as: room setpoints, room airflow rates, room operating modes, actuator timing, and so on. Important parameters fall into two main categories:
1) Individual BACnet configuration values such as setpoints for room temp and air quality.
2) ABT-Inside commissioning parameters such as those used for air component calibration or to tailor features of selected application functions.

If the default application does not meet job requirements, an application can be configured and modified to job specifications using ABT Site.

The Room / Room segment concept
Familiarity with the Room / Room segment concept will be helpful when reading this document. See the "Room/segment" topic under Technical principles in ABT Site help.

Overview
14020 / 14720

VAV/CV Cooling Only Application Template 14020 (DXR), 14720 (ADXR). This application template modulates the supply air damper of the terminal box for cooling and ventilation as it maintains room temperature at setpoint. The main output is an analog output for damper position (VavSuPos) that is modulated by an airflow PID controller.

Plant Diagram

 

 

 

AirFlSu

Airflow Supply Air

 

ROpUn

Room operating unit

 

VavSu

Variable air volume supply air damper

 

 

 

 

TSu

Supply air temperature sensor (for monitoring and diagnosis)

 

 

 

Description of Functions

Basic Functions

 

Auxiliary Functions

  • Room/Room Segment
  • Operating modes for room, plant and devices
  • The VAV terminal box provides control of ventilation and cool air for cooling
  • Supply air VAV box, pressure sensor
  • Supply chain coordination

 
  • Green Leaf function
  • Rapid Ventilation
  • Comfort button for occupant override

 

 

 

CAUTION

Nominal air volume flow (AirFlNom)
AirFlNom must be understood and set correctly. See Nominal Air Volume Flow in section VAV Supply Air Damper.

Operating diagrams

Key:

 

VavSuAirFlMaxC
[CLG FLOW MAX]

Supply air VAV maximum air volume flow for cooling

VavSuAirFlMinC
[CLG FLOW MIN]

Supply air VAV minimum air volume flow for cooling

VavSuAflMinVnt
[VENT FLO MIN]

Supply air VAV minimum air volume flow for ventilation

VavSuAflMaxVnt
[VENT FLO MAX]

Supply air VAV maximum air volume flow for ventilation

AirFlMinRCmf

 

Minimum room air volume flow for ventilation in comfort mode.

AirFlMinRPcf

 

Minimum room air volume flow for ventilation in pre-comfort mode.

AirFlMinREco

 

Minimum room air volume flow for ventilation in economy mode.

AirFlMinRPrt

 

Minimum room air volume flow for ventilation in protection mode.

SpC
[CLG STPT EFF]

Setpoint for cooling (current)

SpH
[HTG STPT EFF]

Setpoint for heating (current)

Temperature sequencing
see following page(s)

 

 

 

Cooling airflow (blue)
Heating airflow (red)
Ventilation airflow (green)
Heating coil (dotted red)

 

 

 

NOTE:
Variant sequence(s) can be configured using ABT Site. See the Application Help for information on airflow and temperature sequencing of HVAC device componenents.

 

 

QMX3.P34

Features