Installation, Operation and Maintenance manual
43
Downflo
®
Evolution
Problem
Probable cause
Remedy
Pulse cleaning
never stops
Pressure switch not
wired to the timer
board correctly
Connect the pressure switch on the timer board to
Terminals 7 and 8 on TB3.
Pressure switch
terminals on
the timer board
jumpered
Remove jumper wire on Solid-State Timer board
before wiring to the Delta P Control.
High Pressure On
or Low Pressure
Off setpoint not
adjusted for system
conditions
Adjust setpoints to current conditions.
Pressure tubing
disconnected,
ruptured, plugged,
or kinked
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 filters if filters do not clean down.
Pressure tubing
disconnected,
ruptured, plugged,
or kinked
Check tubing for kinks, breaks, contamination, or
loose connections.
Delta P arrow keys
to not work
Improper operation
Press and hold one of the three setpoint keys to use
arrow keys.
Programming keys
disabled
Remove the Program Disable jumper from Terminals
3 and 4 on TB2.
Cleaning light is
ON, but cleaning
system not
functioning
Improper wiring
Check wiring between the Delta P Control and
the timer board, and between the timer board and
solenoid valve coils.
Defective solenoids
Check all solenoid coils for proper operation.
Timer board not
powered
Check power ON light on timer board's LED display.
If not illuminated, check the supply voltage to the
timer board. Check the fuse on the timer board.
Replace if necessary.
Timer board
defective
If LED is illuminated, observe the output display.
Install a temporary jumper across the pressure
switch terminals. Output levels should flash in
sequence. Check output using a multimeter set to
150-Volt AC range. Measure from SOL COM to a
solenoid output. The needle will deflect when LED
flashes for that output if voltage is present. If LED's
do not flash, or if no voltage is present at output
terminals during flash, replace the board.
