8
Donaldson Company, Inc.
Troubleshooting
Problem Probable Cause Remedy
No display on the
Delta P Plus Control
No power to the control Use a voltmeter to check for voltage at Terminal TB1.
Fuse blown Check the fuse in the F1 fuse tower. Replace if necessary.
Display on the Delta P
Plus control does not
read zero when at rest
Out of calibration Disconnect pressure tubing. See Delta P Plus Control
Calibration.
With collector discharging outside,
differential pressure is present from
indoor to outdoor
Recalibrate with the pressure tubing attached as described
in Delta P Plus Control Calibration.
Display reads “_ _ _”
Pressure out of the allowable range Check that high and low pressure tubing is attached and
not leaking. Use a differential pressure measurement
device to verify that the actual pressure does not exceed
20 “wg.
Delta P Plus Control ON,
but cleaning system
does not start
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.
Pressure tubing disconnected,
ruptured, or plugged
Check tubing for kinks, breaks, contamination, or loose
connections.
Pulse cleaning never
stops
Pressure switch terminals on the
timer board jumpered
Remove jumper wire on solid-state timer board before
wirng to Delta P Plus Control.
Pressure switch not wired to the
timer board corrrectly
Connect the pressure switch on the timer board to terminal
7 (normally open) and Terminal 8 (common) on TB3.
High or low setpoint not adjusted
for system conditions
Adjust setpoints to current conditions. See Setpoint
Adjustment.
Pressure tubing disconnected,
ruptured or plugged.
Check tubing for kinks, breaks, contamination, or loose
connections.
Alarm light is ON
Alarm setpoint too low Adjust to a higher value.
Excess pressure drop Check cleaning system and compressed-air supply.
Replace lter cartridges if lters do not clean down.
Pressure tubing disconnected,
ruptured, or plugged
Check tubing for kinks, breaks, contamination, or loose
connections.
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