VMA1832 Technical Specifications - Metasys - MS-VMA1826-x - MS-VMA1832-x - Field Device - VMA18 VAV Modular Assembly

VMA1826/1832 VAV Controller Installation Guide

Product name
VMA18 VAV Modular Assembly
Document type
Installation Guide
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Table 1. VMA1832 Controllers

Product Code Numbers

MS-VMA1826-x, MS-VMA1826-xG:

32-bit, Integrated VAV Controller and Actuator, 3 UI, 3 BO, and 2 CO; 24 VAC; FC Bus, and SA Bus; Includes cable adapters for use when replacing VMA14xx Series controllers. Recommended replacement for VMA1440 controller (No DPT).

MS-VMA1832-x, MS-VMA1832-xG:

32-bit, Integrated VAV Controller/Actuator/DPT, 3 UI and 2 BO; 24 VAC; FC Bus, and SA Bus, includes cable adapters for use when replacing VMA14xx Series controllers. Recommended replacement for VMA1410, VMA1415, or VMA1420 controller.

Supply Voltage

24 VAC (nominal, 20 VAC minimum/30 VAC maximum), 50/60 Hz, Power Supply Class 2 (North America), Safety Extra-Low Voltage (SELV) (Europe)

Power Consumption

10 VA typical, 14 VA maximum

Note: The VA ratings do not include any power supplied to the peripheral devices connected to Binary Outputs (BOs) or Configurable Outputs (COs), which can consume up to 12 VA for each BO or CO for a possible total consumption of an additional 60 VA (maximum).

Ambient Conditions

Operating: 0°C to 50°C (32°F to 122°F)

Storage: -40°C to 70°C (-40°F to 158°F)


Inputs/Outputs, SA bus, and Supply Power: 6.3 mm (1/4 in.) Spade Lugs

N2/FC Bus Pluggable Screw Terminal Block

TSTAT Modular Port: RJ-45 8-Pin Modular Jack

Controller Addressing

N2 Open Protocol: Valid field controller device addresses 1–254

BACnet MS/TP: Valid field controller device addresses 4–127

(Device addresses 0–3 and 128–255 are reserved and not valid field controller addresses.)

Communications Bus

N2 Open Protocol:

N2/FC Bus: 1.5 mm (18 AWG) standard 3-wire, twisted, shielded cable recommended between the supervisory controller and field controllers

BACnet MS/TP Protocol:

SA Bus: 0.6 mm (22 AWG) stranded, 4-wire (2-twisted pairs) shielded cable recommended from the VMA controller for network sensors and other sensor/actuator devices; includes a terminal to source 15 VDC supply power from VMA to SA Bus devices

Note: For more information, refer to the N2 Communications Bus Technical Bulletin (LIT-636018).

Input and Output Capabilities

3 - Universal Inputs: Defined as 0–10 VDC, 4–20 mA, 0–600k ohm, or Binary Dry Contact

3 - Binary Outputs: Defined as 24 VAC Triac (internal power source)

2 - Configurable Outputs: Defined as 0–10 VDC or 24 VAC Triac BO

Analog Input/Analog Output Accuracy

Analog Input:15-bit resolution on UIs

Analog Output: 0–10 VDC ± 200 mV

Air Pressure Differential Sensor

Range: -1.5 in. to 1.5 in. W.C.

Performance Characteristics:

Accuracy: ±0.75% Full Span Maximum (±0.0225 in. W.C.)

Note: Combined error due to calibration, accuracy, non-linearity, and temperature variation.

Typical accuracy at zero (null) pressure is ±0.003 in. W.C.

Actuator Rating

4 N·m (35 lb·in) minimum shaft length = 44 mm (1-3/4 in.)


Mounts to damper shaft using single set screw and to duct with single mounting screw


(Height x Width x Depth)

165 mm x 125 mm x 73 mm (6.5 x 4.92 x 2.9 in.)

Center of Output Hub to Center of Captive Spacer: 135 mm (5-5/16 in.)


0.65 kg (1.45 lb)


United States:

UL Listed, File E107041, CCN PAZX, UL 916, Energy Management Equipment; Suitable for use in other environmental air space (plenums) in accordance with Section 300.22(C) of the National Electric Code.

FCC Compliant to CFR47, Part 15, Subpart B, Class A.


UL Listed, File E107041, CCN PAZX7, CAN/CSA C22.2 No. 205, Signal Equipment;

Industry Canada Compliant, ICES-003


CE Mark – Johnson Controls, Inc., declares that this product is in compliance with the essential requirements and other relevant provisions of the EMC Directive 2004/108/EC.

Australia and New Zealand:

RCM Mark, Australia/NZ Emissions Compliant.