Chapter 4 Sequence of operation
72 CNT-SVX05B-EN
The emergency override command influences the controller’s supply fan,
outdoor air damper, and exhaust fan to create the desired condition, as
shown in Table 27.
Duct static pressure (when present) is always controlled when the supply
fan is running. Freeze avoidance in emergency override can force the
heating and cooling valves open.
Water valve override
To support water balancing, the controller includes a communication vari-
able (nviValveOverride) that allows a user to specify the desired state of
all water valves. The states supported are:
• Open all valves
• Close all valves
Unless the communicated variable is refreshed within 10 hours, the over-
ride ends and the valve operation reverts to normal heating/cooling oper-
ation.
Use the Rover service tool to access this feature.
Table 27. Emergency override commands
Command Supply fan
Outdoor air
damper
Exhaust fan
Pressurize On Open Off
Depressurize Off Close On
Purge On Open On
Shutdown Off Close Off
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