Donaldson Torit DFO 2-4, Installation And Operation Manual, Page: 39 / 44

Downflo Oval, DFO 2-4 and 3-6
36
Problem Probable Cause Remedy
Insufficient airflow
continued
Lack of compressed air See Rating and Specification Information for
compressed air supply requirements.
Pulse cleaning not energized Use a voltmeter to check the solenoid valves in the
control panel. Check pneumatic lines for kinks or
obstructions.
Dust storage area overfilled or
plugged Clean out dust storage area. See Dust Disposal.
Pulse valves leaking
compressed air Lock out all electrical power to the unit and bleed
the compressed air supply. Check for debris, valve
wear, pneumatic tubing fault, or diaphragm failure by
removing the diaphragm cover on the pulse valves.
Check for solenoid leaks or damage. If pulse valves
or solenoid valves and tubing are damaged, replace.
Solid-State timer failure Using a voltmeter, check supply voltage to the timer
board. Check and replace the fuse on the timer
board if necessary. If the fuse is good and input
power is present but output voltage to the solenoid
is not, replace the timer board. See Solid-State Timer
Installation.
Solid-State timer out of
adjustment See Solid-State Timer and Solid-State Timer Wiring
Diagram.
No display on the Delta P
Controller
No power to the controller Use a voltmeter to check for supply voltage.
Fuse blown Check the fuse in the control panel. See wiring
diagram inside the control panel. Replace if
necessary.
Display on Delta P
Controller does not read
zero when at rest
Out of calibration Recalibrate as described in Delta P Maintenance
Manual.
With collector discharging
outside, differential pressure is
present from indoor to outdoor Recalibrate with the pressure tubing attached as
described in the Delta P Maintenance Manual.
Delta P Controller ON,
but cleaning system does
not start
Pressure tubing disconnected,
ruptured, or plugged Check tubing for kinks, breaks, contamination, or
loose connections.
Not wired to the timing board
correctly Connect the pressure switch on the timer board to
Terminals 7 and 8 on TB3.
Faulty relay Using a multimeter, test relay for proper closure.
Replace if necessary.