Navien LCB700-21RS Installation & Operation Manual page 73

21RS/RSX
Model
21LS/LSX
A 32 mm
Ignition
B 18 mm
Dim.
C 3±0.5 mm
Replacing the Flexible Oil Hose and Oil Nozzle
CAUTION
Using a worn-out flexible oil hose for a long time may block
the nozzle. A blocked nozzle will result in the formation of
soot and the burner will not ignite properly which may lead
to property damage or injury.
1. Remove the fan and burner assembly.
28RS/RSX 36RS/RSX
28LS/LSX 36LS/LSX
37 mm 42 mm
20 mm 26 mm
3±0.5 mm 3±0.5 mm
2. Replace the old flexible oil hoses with new ones.
3. Remove the three screws on the burner housing and replace
the old oil nozzle with new one.
Flexible Oil
Hose
Oil Nozzle
Maintaining the Boiler 73