Williams 1773511 - Manual (Page 16)

Annual Maintenance Requirements
1. Clean fan blades.
2. Clean air blower.
3. Check and clean silicone red pipes.
4. Check air flow switch.
5. Clean and check exhaust flue pipe and air intake pipe.
Check red O-Ring Gasket
(NRNG003). If it is
damaged, replace it.
6. Check for gas leaks on all connections.
7. Check and adjust gas pressure.
15
Gas inlet pressure
(pipeline)
Gas burner pressure
adjustment
Gas manifold
pressure (burner)