Torit Downflo SDF-2 - Page 50

50
Donaldson Company, Inc. © 1995
TROUBLE POSSIBLE CAUSE REMEDY
7.0 Troubleshooting Guide
5. Pulse valves are not
functioning.
c. Pulse control timer
board is out of
adjustment.
1. No power to the control.
2. Fuse blown.
1. Out of calibration.
2. Differential pressure
present from indoor to
outdoor with collector
discharging outside.
1. Not properly wired to the
timer board.
2. Faulty relay.
3. Pressure tubing
disconnected, ruptured, or
plugged.
D. Insufficient airflow
(cont.).
E.
∆∆
∆∆
∆P Control shows no
display.
F.
∆∆
∆∆
∆P Control display does
not read zero when at
rest.
G.
∆∆
∆∆
∆P Control is on, but
does not start the
cleaning system.
5c. Refer to Section 2.6.3 Solid-
State Timer Specifications
located in this manual and
to Figure 29 SDF Solid-
State Timer Wiring
Diagram.
1. Use multimeter to check for
voltage at the terminals of
TB1.
2. Check the fuse in fuse
tower F1. Replace if bad.
1. Disconnect pressure tubing.
Recalibrate per Section 5.3
∆P Control Calibration.
2. Recalibrate with tubing
attached per Section 5.3 ∆P
Control Calibration. Ignore
if desired.
1. Be sure that the Pressure
Switch connection on the
timer board is connected to
terminals 7 & 8 on TB3.
2. Test the relay for proper
closure with multimeter. If
nonfunctional, replace the
∆P Control.
3. Check the tubing for kinks,
breaks, contamination, and
loose connections.