9
Donaldson Company, Inc.
Problem
Probable Cause
Remedy
High filter Delta P
Compressed air supply wet or oily
Bleed compressed air supply. Check for debris, valve
wear, 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.
Pulse valves leaking compressed
air
Lock out all electrical power to the collector 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.
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.
Troubleshooting
