49
8.9 Safety interlock
As standard the boiler is supplied with an interlock carrying a 24 Volt boiler control cir-
cuit. To use first remove the fitted wire link (on LH side of terminal block between 10
and 14). Any external devices required to stop the boiler should then be wired in series
and connected to terminals 10 and 14.
If the contacts of the external interlock have opened during heat demand, the boiler
will shut off for 120 seconds (failure code
b@^
). Should the contacts close again
during heat demand, the boiler will wait the remaining time from the 120 seconds
before attempting a restart.
9 COMMISSIONING
9.1 Initial lighting
1. Isolate main power supply
2. Remove the front panel.
3. Check that the gas supply is available, sound and vented.
4. Open the instrument box.
5. Check that the electrical connections match the control options
6. Open the cap of the automatic air vent.
7. Check boiler and installation is full of water and at the correct pressure
8. Vent the system if necessary.
9. Fill the siphon with water.
10. Close the instrument box.
11. Check the flue and the combustion air supply connections.
NOTE:
The boiler is suitable for both natural gas and propane firing.
It is supplied as standard set for natural gas, therefore the following procedure must be
carried out BEFORE the boiler is fired and commisioned for the first time on propane.
Adjust the the part load speed from 1200 rpm to 1400 rpm (HTG and DHW,
see Par.
6.6.3 and 6.6.8
) and the gas rate screw app. 3 ½ turns clockwise.
12. Open the gas cock.
13. Re-establish power supply to boiler and controls.
14. Use manual override to start the boiler.
15. The boiler should start with the run sequence indicated in the code-display,
see Par. 6.3.
16. Check the boiler for correct gas/air setup in full load and part load by measuring
the O
2
levels in the flue gas (direct measurement of CO
2
can lead to inaccuracies
due to varying CO
2
levels in the natural gas). Proceed as follows:
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