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Johnson Controls AP-VMA1420-0 - VMA Digital Controller

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2.95 LBS
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 Product Description

The Johnson controls Variable Air Volume Modular Assembly (VMA) AP-VMA1420-0 is a configurable digital controllers, and combines a controller, pressure sensor, and/or actuator housed in one preassembled unit.

Features and Benefits

The Johnson Controls AP-VMA1420-0 Integrated Module Includes controller, pressure sensor, and/or actuator, and is preassembled to reduce installation time. The enhanced actuator provides a fast response stepper motor that drives the damper from full open to close in 30 seconds.  Automated Commissioning uses Proportional Adaptive (P-Adaptive) and Pattern Recognition Adaptive Control (PRAC) for continuous loop tuning while advanced diagnostics offer damper stall detection, starved box detection, actuator motor duty cycle, VAV box flow test, and other diagnostics. Network communications enables integration into a Building Automation System (BAS) and easy configuration provides simple question/answer software format for quick selection of project-specific applications. Software addressing allows remote addressing and identification from a configuration tool.

Actuator Enhancements

The AP-VMA1420-0 uses an actuator with a fast response stepper motor, which is quiet (<35 dBA) and precise (23 K resolution). The stepper motor drives the damper from full open to full close in 30 seconds. This significantly reduces the time to commission and balance a VAV terminal box. The stepper motor quickly and accurately adjusts the damper position in response to new conditions, minimizing position hunting and motor runtime. The AP-VMA1420-0 requires an external floating/3-wire (incremental) or proportional actuator.

Advanced Diagnostics

The AP-VMA1420-0 has several unique diagnostic features. Diagnostics include damper stall detection, starved box detection, actuator motor duty cycle, VAV box flow test, and others.

The VMA constantly monitors the space temperature and airflow and generates alarms to alert the operator of setpoint deviations. The operator can react quickly, taking corrective action to get the system back into desired operation. This assures occupants better comfort control.

Simply mount, wire, configure, download, and commission the controller. Because the AP-VMA1420-0 performs loop tuning automatically, there is no need to set proportional bands and integration terms. Also, there is no need to set any jumpers or switches. Even network addressing can be done via software, if desired. The AP-VMA1420-0 is configured to detect the damper end-stops automatically. On power up, the actuator drives to both hard stops on the VAV box and remembers these positions. These automated features get the system operating quickly.


The AP-VMA1420-0 modular assembly is in a durable, plenum-rated, plastic housing. The controller and pressure sensor are enclosed in one module attached to the actuator. The unique plastic housing may eliminate the need for a separate enclosure for plenum-rated construction. Check code requirements for appropriate applications. Line voltage relays and transformers still require an enclosure. The N2 communication connector has removable screw terminals. Input/Output (I/O) connections to the VMA are easy-to-use spade lugs. If you prefer screw terminal I/O connections, be sure to order the appropriate optional removable screw terminal kit accessories. The differential pressure sensor in the AP-VMA1420-0 provides consistent flow readings with minimal drift. This means auto-zero calibration is required less often. There are no filters to change, which ensures accuracy. A Light-Emitting Diode (LED), visible through the housing, indicates that power is connected and communication has been established.


Systemssingle duct, dual duct, fan-powered (series or parallel), pressure independent, supply/exhaust
Terminal Box Heatingfloating 3-wire actuator, proportional valve actuator, normally open or closed valve, 1-3 stage electric
Supplemental Heatingfloating 3-wire valve actuator, proportional valve actuator, normally open or closed valve, single-stage electric
Coolingstepper motor damper actuator
Floating/3-wire Incrementalexternal damper and valve
Proportional actuatorExternal damper and valve
Fan-powered terminal boxparallel, temp based, parallel, airflow setpoint, series, on/off control, series, proportional control
LightingOn/Off in relation to occupancy mode

Product Specifications

Supply Voltage20-30 VAC at 50 or 60 Hz
Optional Fuse Current2.0 amperes
Power Consumption10 VA maximum (Relay and valve requirements not included.)
Ambient Operating Conditions0 to 50°C (32 to 122°F)
Ambient Storage Conditions-40 to 70°C (-40 to 158°F)
Terminations6.3 mm (1/4 in.) spade lugs (Communication has screw terminals.)
Serial InterfacesN2 Bus and Zone Bus. N2 Controller Addressing DIP switch set (1-253) Addresses 254 and 255 are reserved. Software addressable with HVAC PRO software, Release 7.02 or later.
Communications BusN2 between VMA and NCM or N30. Zone Bus between VMA and room sensor (8-pin phone jack or wire to spade lugs or optional plug-on terminals) (Not available when the TE-7720 RF Receiver is applied).
Mounting One screw (included) mounts the VMA1420 to the VAV box. One screw attaches the damper shaft to the actuator, 8 mm (5/16 in.) square head set screw with 44 N-m (389.4 lb-in.) of axial holding power for up to 13 mm (1/2 in.) round damper shafts. Minimum damper shaft length is 44.5 mm (1-3/4 in.).
Housing Plastic housing for controller/actuator with UL94-5VB Plenum Flammability Rating
Dimensions (L x W x H) 153 x 102 x 102 mm (6 x 4 x 4 in.)
Actuator Torque4 N-m (35 lb-in) minimum
Shipping Weight13.1 kg (29 lb) for a box of ten, 1.3 kg (2.8 lb) each
Electrical InputsAnalog Inputs:
Nickel, silicon, platinum (1 K ohm), or NTC (2.25 K) RTD room sensors,
1.6 K setpoint potentiometer (2-wire)
Voltage input for 0-10 VDC (humidity or pressure sensor)
Binary Inputs: Dry contacts
Input configurations vary based on model type.
Velocity PressureVelocity Pressure for 374 Pascal (0-1.5 in. W.C.)
OutputsBinary outputs, 24 VAC triac switched, 25-500 mA loads
Stepper drive, 2 to 767 steps per second (23,000 step resolution)
Analog output, 0-10 VDC @ 10 mA maximum
Standards Compliance CSA 22.2 No. 205, UL 916, UL 864 (UUKL), UL 94-5VB, FCC Part 15, Subpart B, Class A and B, C-tick Australia/NZ, AS/NZS 4251.1, CISPR 22, Class B, CE Directive (89/336/EEC, EN50081-1, EN50082-2) Industrial, IEEE 472, IEEE518, IEEE587 Category A/B, IEC-950, IEC 801-2, -3, -4, -6, -7, -8, ANSI C62.41 A/B

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