Johnson Controls VMA1400 Series - User Manual

Technical Bulletin
Issue Date 11/01/01
© 2001 Johnson Controls, Inc. www.johnsoncontrols.com
Code No. LIT-6363125
T
ECHNICAL
B
ULLETIN
Mounting and Wiring Variable Air Volume Modular
Assembly (VMA) 1400 Series Controllers
Mounting and Wiring VMA1400 Series Controllers ...........................3
Introduction......................................................................................................... 3
Key Concepts...................................................................................................... 4
VMA Position and Orientation..........................................................................................4
Damper Actuator Direction to Close ................................................................................4
N2 Address Switches ......................................................................................................4
Wiring and Cabling Precautions ......................................................................................5
General Wiring Information..............................................................................................6
Power Source Wiring.......................................................................................................6
Phone Jack Polarization ................................................................................................10
Sensor Interfaces ..........................................................................................................11
Procedure Overview......................................................................................... 14
Detailed Procedures......................................................................................... 16
Preparing the VMA for Mounting....................................................................................16
Mounting the VMA1410/1420 ........................................................................................18
Mounting the VMA1430 .................................................................................................18
Setting the Damper Position (VMA1410, 1420, or VMA1430 with External Actuator).....19
Wiring the VMA .............................................................................................................21
Connecting the N2 Bus..................................................................................................24
Reference Information ..................................................................................... 26
VMA Wiring List.............................................................................................................26
VMA Single Duct Application Wiring Diagram................................................................28
VMA Single Duct Supply/Exhaust Wiring Diagram ........................................................29
VMA Dual Duct Application Wiring Diagram ..................................................................30

Johnson Controls VMA1400 Series Specifications

General

Model	VMA1400 Series
Input Voltage	24 VAC ±20%, 50/60 Hz
Communication Protocol	BACnet MS/TP
Number of Universal Inputs	4
Number of Binary Outputs	2
Number of Inputs	4
Number of Outputs	2
Power Consumption	10 VA max
Input Signal	0-10 VDC
Storage Temperature	-40 to 70 °C
Weight	0.5 lbs
Enclosure Rating	IP20
Type	Variable Air Volume (VAV) Controller
Relative Humidity	5 to 95% RH, noncondensing

Summary

Mounting and Wiring VMA1400 Series Controllers

Introduction

Overview of VMA1410/1420 and VMA1430 controllers, their integration, and document scope.

Key Concepts

VMA Position and Orientation

Guidelines for positioning and orienting the VMA for optimal function and accessibility.

Damper Actuator Direction to Close

Importance of correctly setting damper actuator direction for accurate readings.

N2 Address Switches

Best practices for setting N2 address switches before VMA mounting for accessibility.

Wiring and Cabling Precautions

General Wiring Information

Power Source Wiring

Phone Jack Polarization

Sensor Interfaces

Procedure Overview

Prepare the VMA for Mounting

Steps to prepare the VMA, including checking equipment, tools, and environmental requirements.

Mount the VMA1410;1420

Steps for mounting the VMA1410/1420 unit onto the damper shaft.

Mount the VMA1430

Steps for mounting the VMA1430 unit onto a vertical surface.

Set the Damper Position (VMA1410, 1420, or VMA1430 with External Actuator)

Procedures for setting the damper position for VMA1410, 1420, or 1430 with external actuator.

Wire the VMA

Steps for wiring the VMA, including power disconnection and terminal types.

Connect the N2 Bus

Steps to connect the N2 Bus, including setting the address and observing LED status.

Detailed Procedures

Preparing the VMA for Mounting

Detailed steps and requirements for preparing the VMA before mounting.

Setting the N2 Address Switches on a VMA1410;1420

Mounting the VMA1410;1420

Mounting the VMA1430

Setting the Damper Position (VMA1410, 1420, or VMA1430 with External Actuator)

Wiring the VMA

Connecting the N2 Bus

Reference Information

VMA Wiring List

Comprehensive list of VMA points, their applications, and wiring specifications.

VMA Single Duct Application Wiring Diagram

VMA Single Duct Supply;Exhaust Wiring Diagram

VMA Dual Duct Application Wiring Diagram

VMA Internal Schematic Diagram

Fabricating Your Own Interconnection Cable

Troubleshooting

Troubleshooting VMA Room Temperature Drift

Identifies causes and solutions for VMA zone temperature drift due to wiring issues.