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Technical Bulletin

Issue Date 11/01/01

Code No. LIT-6363125

ECHNICAL

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 User Manual

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