VMA1400 Series Overview and Engineering Guidelines Technical Bulletin 32
Detailed Procedures
Determining VAV Box Requirements
To determine VAV box requirements:
1. Select the VMA based on control sequence, Input/Output (I/O),
side loops, and flow measurement accuracy requirements.
2. Establish sensor placement in zones.
3. Contact box manufacturer’s representative to authorize mounting
or mount on site. Consider the following:
• VAV box must have hard stops on either the open or closed
position.
• damper shafts protruding less than 44 mm (1-3/4 in.) from
the box are not acceptable for the VMA1410 and
VMA1420.
• shaft bushings may interfere with level mounting of the
VMA1410 and VMA1420.
• project install date
• plans and specifications
• wiring diagrams and specifications to box manufacturer
• who does what: including mounting, connecting,
downloading, testing, shipping
• who provides what parts, including control enclosure and
transformer
4. Coordinate field or factory mounting.
Establishing the Room Schedule
To establish the room schedule:
1. Develop application configuration files based on project
requirements. For flow calculation constants, refer to Appendix B:
VAV Controller Flow Calculation Constants Application Note
(LIT-6375185).
2. Determine control strategy.
3. Select appropriate room sensors based on project specifications.
Note: The VMA does not support sensor sharing. Each VMA
requires its own sensor. If you attempt to share the sensor, the VMA
will not read the sensor value correctly, resulting in poor control.
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