Radio Frequency Systems
BD550W Series Air Dryers User’s Guide
Page 95 of 104
100518833 – Rev. B
13.15 Inconsistent Heatless Dryer Cycling
Possible Cause
Check
Corrective Action
Defective Solenoid
Valve
Measure voltage going
to the Heatless Dryer
Solenoid Valves
(section 9.7 )
If 53 VDC (120V unit)
or 110 VDC (240V
unit)
IS
present, replace
Solenoid Valves
included in the 8,000
Hour Maintenance Kit
(section 11.6 )
Defective Cycle Timer
Measure voltage going
to the Heatless Dryer
Solenoid Valves
(section 9.7 )
If 53 VDC (120V unit)
or 110 VDC (240V
unit)
IS NOT
present,
replace the Cycle Timer
(section 11.3 )
13.16 Compressor Doesn’t Operate
Possible Cause
Check
Corrective Action
Defective compressor
Measure compressor
voltage
(section 9.3 )
If voltage is good,
replace compressor
(section 11.2 )
or send it in for repair
(section 12. )
Defective control board Measure compressor
voltage
(section 9.3 )
If measurements are
incorrect, replace
control board (section
11.1 )
System is in Shutdown
state
On the Display Panel,
verify that the system is
in
SHUTDOWN
state
Press the
RESET
Button
13.17 Compressor Won’t Build Pressure
Possible Cause
Check
Corrective Action
Low System Pressure
Verify System Pressure
Adjust System Pressure
to 60 PSI (414 KPa) ± 2
PSI (13.8 KPa).
Defective Unloader
Valve
Test Unloader Valve
operation (section 9.6 )
If this is continuously
flowing high amounts
of air, the Unloader
Valve is defective.
Replace Unloader
Valve
(section 11.3 )
