ECM Overview and Setup
84 UNT-SVX07E-EN
VelociTach Motor Control Board
The motor control board:
• Coordinates the operation of the fan in response to
electric heat behavior and electric behavior in
response to hydronic heat behavior.
• Incorporates a user interface that allows adjustment of
certain unit parameters and provides constant
feedback on motor operation.
• Integrates service and troubleshooting tools, including
high-precision tachometers, fan status, and electric
heat-enabled indicators.
• Integrates a versatile configurable auxiliary
temperature sensor.
• Incorporates various safety and lockout features, such
as maintaining proper fan speeds if electric heat is
called for.
Status Display
The motor control board contains a four-digit, seven-
segment display that is used to present information in a
format close to real-world language, while having a small-
form factor. Most characters are immediately
recognizable; however, please consult Table 3 7 and
Table 38 for the graphical representation of each
alphanumeric character.
Figure 73. VelociTach motor control board
Display and Menu/Enter,
Increase, and Decrease
buttons
Figure 74. Status display
Table 37. Screen representation of alphabetical characters
ABCDEFGHI JKLMNOPQRSTUVWXYZ
Table 38. Screen representation of numeric characters
1234567890
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