CaptiveAire HVLS - Automatic Mode Startup

48
Automatic Mode Startup
During Automatic Mode Startup, it is important to verify min and max fan speed operation, group settings,
and all temperature settings. All temperature sensors (HMI sensors and remote hard wired sensors)
assigned to a group will average together. The averaged sensed temperature will be the temperature used
for fan activation and modulation. Individual temperature sensors will be used for high and low-
temperature limits and alarms.
Once in AUTOMATIC mode, to start the fans:
1. Apply heat to the sensors assigned to a fan group, so the resulting temperature goes above the
defined activation temperature.
2. Fans should turn on and begin to modulate based on the activation temperature and the modulation
band.
3. Fans should reach their maximum speed at a temperature of (activation + modulation band).
4. Cool the sensors down so that the resulting temperature is below the activation minus hysteresis
temperature. The fans should stop once the temperature is cool enough, and the min cycle time has
expired.
If any sensor is disconnected or has failed, the control will produce a fault stating such. Also, if there is a
sensor assigned to a group and it is not connected correctly, a warning will be displayed. If a low temp or
high temp limit is reached by any individual sensor, all fans in that fan group will stop operation.
Use Table 9 to record all initial startup data. Keep data for troubleshooting when necessary.
NOTE: All fans assigned to a group will follow the same temp settings and speeds. They will all
start together, stop together, and modulate together. They will also have the same minimum and
maximum speeds and temperature limits. If independent control is needed for specific fans, that
fan should be in a group by itself.
Table 9 - Manual Mode Fan Startup Checklist
Fan 1 Fan 2 Fan 3 Fan 4 Fan 5 Fan 6 Fan 7 Fan 8 Fan 9 Fan 10
Maximum
Frequency
Minimum
Frequency
Rotation Correct
Number of Fans in
Group
HMI Sensors
Remote Temp
Sensors
Activation
Temperature
Modulation
Band
Hysteresis
Temperature
Minimum Cycle
Time
High Temp Alarm
Low Temp Alarm