9
2.4.4) 2 stage modulation gas valve
With the boiler running, turn the setting of the control
that causes the 2
nd
stage to open the circuit. The gas
flow to the burners should decrease on the contact
opening.
2.4.5) Gas leaks
Check the whole system for gas leaks after the
installation is completed. Use a solution of soap and
water on the pipe joints.
DANGER
If there is a strong smell of gas due to a major
leak:
1. Open the windows,
2. Do not activate any electrical switches,
3. Extinguish all flames,
4. Immediately call your gas supplier from
another building.
PART 3
MAINTENANCE
Your boiler should be inspected once a year by a
qualified technician.
The following points require particular attention:
1.1) Heat
exchanger
The heat exchanger should be checked for soot
deposits. If necessary, follow the procedures below to
clean the heat exchanger. Consult Figure 2.
1. Remove the burner tray to prevent the soot from
falling on the burners;
2. Remove the connecting flue-pipe and the draft
hood;
3. Remove the “V” shaped baffles on the heat
exchanger;
4. Clean the tubes with a suitable brush;
5. Vacuum the debris at the bottom of the unit;
6. Reinstall the parts.
1.2)
Drawer assembly (burner tray)
Your HGC boiler is equipped with a burner tray to allow
you to remove the burners and manifold without
dismantling the appliance. To remove the burner tray,
disconnect the union on the gas piping and disconnect
the wiring harness. Pull out the tray.
1.3) Combustion
chamber
While the burner tray and the draft hood are removed,
use a light to thoroughly check the condition of the
combustion chamber and repair if needed.
1.4)
Flue-pipe and connecting pipe
Inspect and clean if necessary.
1.5) Miscellaneous
a. If a mechanical fresh air intake device is used,
check if it is functioning properly.
b. Inspect the circulating pump and lubricate if
necessary.
c. Test the high temperature limit control and the
operation controls.
d. Test the safety valve.