Mark MEGAFLEX, Technical Manual

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6.7 Pneumatic connections
A pneumatic diagram for the Intermodul 850 kW (11 sections) and the Intermodul 1020 kW (13 secti -
ons) is given in the figure below.
The siphon pressure switch, connected to the sump, prevents overflow of the syphon in the case of ex -
cess back pressure in the flue.
The air pressure switch, connected to the venturi, checks the amount of air (by means of a Δp measure -
ment) before startup.
6.8 PC-connection
For information regarding connection of a PC to the boiler please contact your supplier.
7 PUTTING INTO OPERATION
1. Fill and bleed the system. Fill the boiler until a pressure between 1.5 and 2 bar is achieved. The maxi-
mum working pressure is 6 bar. The boiler (not the installation !) is automatically bled by a built in
automatic air vent.
2. Check all gas and water connections thoroughly for leaks.
3. Bleed the gas pipe.
4. As standard the boiler is set for G20 or G25 Check that the installation provides the correct type of
gas to the boiler.
5. Check the inlet pressure : 20 mbar or 25 mbar
6. Turn on the boiler by setting the main switch on the control panel of the boiler to position 1 (on).
7. Generate (create) a heat demand.
8. Just before ignition the control checks if the contacts of the gas pressure,syphon pressure and water
pressure switches are closed. If not, the boiler will block and the display will show E76.
9. If gas, water syphon pressure switches are closed the burner will be ignited.
10.
Perform a thorough check on flue-gas joints for leakage.
11. Check the heat input and the gas pressure at maximum load.
12. Heat up the installation. Stop the heat request.