Cashco 1049 - Manual (Page 6)

6 IOM-1049
possible cause remedy
A. Pilot diaphragm failure. A1. Disassemble and check pilot diaphragm. Replace if re-
quired.
3. Vapor leaking from pilot spring bonnet.
possible cause remedy
A.
B.
C.
D.
O-ring seat has failed.
Foreign particles trapped between seat and seat
plate.
Sense line clogged.
Back pressure higher than tank pressure.
A1.
B1.
C1.
D1.
Disassemble and check o-ring seat. Replace if required.
Check and clean as needed.
Check sense line and sense port for blockage. Clean as
needed.
Vent operating properly
4. seat leakage
sectIon VI
VII. TROUBLE SHOOTING GUIDE
possible cause remedy
A. Sense line is clogged. A1. Check sense line and sense port for blockage. Clean as
needed
B. Incorrect set pressure. B1. Adjust set pressure screw to proper set pressure.
C. Pilot or actuator diaphragm failure. C1. Disassemble and check diaphragms. Replace if required.
D. Loss of external air/N2 source for air/N2 assist pilot. D1. Check external source.
1. Model 1049 opens below set point.
possible cause remedy
A. Incorrect set pressure. A1. Adjusting set pressure screw to proper set pressure.
B. Pilot exhaust plugged. B1. Check pilot exhaust for blockage. Clean as needed.
C. Sense line clogged. C1. Check sense line and sense port for blockage. Clean as
needed.
2. Model 1049 will not open.