Webster JB Series Installation, Startup, Operation And Maintenance Manual page 44

No. System
Cannot obtain rated input on
oil firing (pres. atom.) (con't)
16 Cannot obtain rated input on
oil firing (air atomized)
17 Cannot obtain NOx levels on
gas
JB Manual
Cause
Oil pressure too low
Flow valve set too low (should be closed at high fire)
Oil nozzles plugged
Air pressure too low
Oil pressure too low
Flow valve set too low
FGR valve not full open
FGR valve full of condensate
FGR duct not directed to flue stream
FGR line too small
Operating on propane, not natural gas
Shutoff valve is not full open
Page 44
Correction
Increase oil pressure
Adjust oil control valve
Clean nozzle
Replace nozzle
Increase oil pressure
Adjust oil control valve
Adjust FGR valve to full open
Clean duct and add drains
Add angle cut in center of stack
Check sizing, use fittings with less drop
Resize FGR for propane operation
Check FGR shutoff valve position
Troubleshooting