FloAire Demand Control Ventilation System - Manual (Page 25)

A0023662
May 2014 Rev.5
25
j. Configure Fan Options
This sub-menu contains all options related to Fan configuration.
Starting from the Main menu of HMI
, press DOWN or UP until the screen displays “Fan Options”.
Press ENTER. Press UP or DOWN until one of the options below is displayed. Press ENTER to
access that option. Press UP or DOWN to select the fan (EXH1, EXH2, SUP1 etc.). Press ENTER.
Press UP or DOWN to change the value of that option for that fan. Press ENTER Press UP or DOWN
to select another fan or press MENU and then UP or DOWN to move on to the next option.
1. Set Fan Direction (Factory Default: FWD):
If the fan is running in the wrong direction at startup, the direction can be changed here without
having to change the wiring of the 3-phase motor.
Fan direction can be changed between Forward (FWD) and Reverse (REV).
2. Set Fan Design CFM
This is the design CFM value specified for each fan. This value is internally matched to the High
Frequency set for this fan and used to calculate the Supply fan frequency, as well as the
Preparation Time Frequency. This value should be adjusted after Test and Balance has been
performed on the hood.
NOTE: Changing this value will NOT automatically change the actual CFM exhausted by the fan.
This is achieved by changing the High Frequency. This value is to report to the Controller what
the design CFM is so it is used for internal calculation.
3. Set High Frequency
The High Frequency is the maximum frequency at which an exhaust fan will be running in
modulation mode. This corresponds to the design CFM of the exhaust fan. This value can be
adjusted during Test and Balance of the hood, if needed to adjust the amount of CFM exhausted
at the hood when the adjustment is smaller than what can be achieved with a pulley change. The
value can be increased up to 80 Hz and lowered down all the way to the Low Frequency setting.
4. Set Low Frequency (Exhaust fans only)
The Low Frequency is the minimum frequency at which an exhaust fan will be running in
modulation mode. The fan can still run slower in Wash mode or in Preparation Time. By default
this value is set to 48 Hz which represents a minimum of 80% of full speed when High Frequency
is left at 60 Hz. 20% is the recommended modulation value to ensure capture and containment at
the hood during cooking. Lowering this value is possible but should be carefully evaluated.
5. Set Modulation (Exhaust fans only)
This value is used to calculate the high temperature of the modulation range for each exhaust
fan. The low temperature is the value at which the fan will come on automatically and at which it
runs at the Low Frequency value. Low temperature = Room temperature measured + Temp
Offset. The high temperature is the value at which the fans are running at full speed or High
Frequency. High temperature = Room temperature measured + Temp Offset + Modulation
Range.
Press MENU multiple times to get back to the main menu or one more time to reboot the processor.