Installation, Operation and Maintenance manual
42
Downflo
®
Evolution
Problem
Probable cause
Remedy
Insufficient airflow
Fan exhaust area
restricted
Check fan exhaust area for obstructions. Remove
material or debris. Adjust damper flow control.
Filters need
replacement
Remove and replace using genuine Donaldson
Torit replacement filters. See Filter Removal and
Installation.
Lack of compressed
air
See Rating and Specification Information for
compressed air supply requirements.
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 removal.
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.
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.
