Key Concepts; Vma1200 Series Models - Johnson Controls VMA1200 Series Technical Bulletin

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VMA1200

Key Concepts

VMA1200 Series Models

Table 1: Feature Checklist
VMA Features
Applications
Pattern Recognition Adaptive Control (PRAC)
on Zone Proportional Plus Integral (PI)
Temperature Loops
Adaptive Flow Control Loops
Single Duct, Pressure Independent VAV
Side Loops without Interlocking
Fan Powered Boxes
Incremental, Proportional, and Three Stages
of Box Heat
Incremental, Proportional Two Position, or
One Stage Supplemental Heat
Damper Actuator
Clockwise (CW)/Counterclockwise (CCW)
Rotation Selection
Software/Tools
Ability to Download Code Firmware
Diagnostics
Moving Average Flow/Temperature
Diagnostic
Actuator Duty Cycle Diagnostic
Commissioning
Balancing Tool with Automatic K-factor
Calculation
Hardware
24 VAC Isolation
Multiple VMAs Powered by a 100 VA
Transformer
Isolated Communication, Binary Outputs, and
24 VAC
Ability to Drive Low Current Relays Down to
25 mA
13-Bit Analog Input/8-Bit Analog Output
Resolution
Analog Input Jumpers Eliminated
Continued on next page . . .
Table 1 lists VMA1200 Series features. Table 2 shows available
VMA1200 models.
Comments
Eliminates manual tuning and seasonal retuning.
No manual tuning, improved control and energy savings
Meets most VAV applications.
Single Analog Input (AI) to Analog Output (AO)/Binary
Output (BO)
Series or parallel
Up to three stages or normally open/closed valves
Normally open or closed valves
Set via M-Pro software, VMA1200 Balancing Tool (VBT)
software, or network management tool for either direction
to close.
Firmware code is upgradeable without removing the VMA.
Provides standard measure of control loop performance
over time.
Indicates shaft slippage.
Palm compatible handheld device (Version 2.0 or later
operating system) on Zone Bus
Eliminates 24 to 24 VAC transformer and polarity concerns.
Up to 14 cooling only. Number of reheat/fan units depends
on power consumption of valve/fan relays.
Saves installed cost and improved electrical noise
rejection.
Eliminates relay chatter.
High accuracy and good device control
All analog inputs are preset reducing labor.