Figure 44 Fuel pipe assembly
5.
Carefully lift off the fuel pipe assembly.
Figure 45 Removing the orifice
6. Remove the orifice.
7. Retain the two O-rings in the elbows for reassembly.
8. Install the kit-supplied orifice.
9. Secure the elbow with bolts on the gas valve side, ensuring that the O-ring is well seated
in the groove.
10. Secure the elbow with bolts on the mixer side, ensuring that the O-ring is well seated in
the groove.
11. Turn on the electric power and gas supply to the boiler.
12. Reset the gas low pressure switch by pressing the clear plastic cover above the Red
button.
13. Tune the gas valve. For instructions, see Adjusting the gas valve (EX 400, EX 500) on
page 74.
14. Check for gas leaks.
Section: Boiler operation