11
If the fan(s) and light(s) come on and “Auto Run Mode” is displayed, the temperature sensor in the hood has
detected a temperature rise. If only the Exhaust fan(s) come on immediately and “FIRE” mode is displayed, check
for proper connection of Fire System Micro-Switch (See Pg. 6) or check that the Fire Suppression system is not in
the discharged position.
With the fan button off, depress the light button to energize the hood lights. The light button should illuminate to
show that the lights are on. If the hood light(s) are not working:
1)
Verify that the bulbs are installed.
2)
Verify that all connections to hood(s) have been made and breakers are on.
If the light(s) are working properly, de-energize the lights by depressing the light button again.
Turn on the fan(s) by depressing the fan button on the display. The fan and light buttons should illuminate (hood
lights are interlocked with fan switch). This indicates the fan(s) and light(s) should be operating. “Manual Run
Mode” should be on the display. If fan(s) are not operating, check all connections to and from the Control Box.
VFD(s) should start and ramp up to a minimum speed of 18 Hz (the provided keypad should be moved from one
VFD to another to check proper start-up). The touch screen display should show a 30% output for Exhaust Fan(s),
building pressure should be green and display ± .01” WC. If an exterior door is opened, the building pressure
display may read ±.00” WC.
Note:
The MUA fan(s) speed is independent of the Exhaust fan(s) speed and is
controlled by the differential building pressure. A positive (+) increase in building pressure will reduce the MUA
Fan(s) speed to maintain balanced building pressure. A negative (-) increase will increase MUA Fan(s) speed to
maintain balanced building pressure. Hood sensor temperature on the display should be approximately the same
as the room temperature.
Check the rotation of the fan(s).
Note:
The exhaust fan(s) will exhaust some air while rotating in reverse. Checking
rotation may be accomplished in two different ways, (1) you may check the direction arrow on the fan(s) or (2)
depress the “100% Override” button on the display and monitor the motor amperage displayed in parameter 104 on
each fan(s) controlling VFD using the VFD keypad (see Setting VFD Parameters Instructions Pg. 12). A fan turning
in reverse rotation will exceed the rated FLA of the motor. If the amperage displayed in parameter P104 on the VFD
is higher than the listed FLA for the fan, it is spinning in reverse rotation. To reverse rotation, change any 2 leads
connected to the VFD output U, V, and W or the rotation may be changed in parameter 400.13 in the VFD using the
keypad (see Setting VFD Parameters Instructions Pg. 12).
CAUTION! More than one disconnect switch may be required to de-energize the equipment before
servicing. Ensure all power sources have been disconnected before installing or servicing the system.
VFD(s) can be holding stored energy when main supply has been switched off. DO NOT touch power
connections immediately. Check power terminals for isolation from supply.
See Fan IO&M for further instructions on fan start-up procedures.
After correct rotation has been verified for all fans, if needed, depress the 100% override button again to manually
run Exhaust fan(s) at 100%. Exhaust fan(s) should be displaying 100% and Pressure display should be a steady
green. The MUA fan(s) speed is independent of the Exhaust fan(s) speed and is controlled by the building
pressure. If both Exhaust and MUA fan(s) are running at 100%, but the pressure is not displaying green and
showing a negative (-) pressure, the maximum Exhaust fan speed may need to be adjusted (See Setting VFD
Parameter Instructions Adjusting Max Speed Pg. 12).
Summary of Contents for AFC-DCV
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