__________________________________________________Chapter 4 – Smoke Control Section, Page 4-33
Wash System – Troubleshooting (Cont.)
Troubleshooting the Wash System – Backflow Preventer
Symptom
Probable Cause
Corrective Action
1
Intermittent discharge of
water.
A.
Intermittent discharge of
water through the relief
valve is fairly common and
usually occurs if there is inlet
pressure fluctuations of
more than 3 psi and when
the water solenoid valve
closes to shut off the Wash
Cycle
1
No action necessary.
2
Continuous discharge of
water when the Ventilator is
not in a Wash Cycle.
A.
Foreign material in the check
valve of the Backflow
Preventer.
1
Refer to page 4-49. Leave the inlet
hand valve open and close the outlet
hand valve. If there is still continuous
discharge it indicates that foreign
material is preventing the check valve
from closing. If repeated Wash Cycle
flushing’s will not clear the check
valve then the unit must be repaired
by a Certified Service Company. Refer
to pages 4-49.
Chart C-4-33-1
