Installation and Operation manual ETHOS 36C and ETHOS 54C –1511/05-issue1
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5.7 Starting the appliance
5.7.1 General
The initial pressure in the gas pipe can be measured with the gas control valve measuring nipple (3).
The minimum initial pressure for the proper operation of the appliance must be 10 mbar.
5.7.2 First commissioning
When you have tested the installation and everything is in order, you can insert the plug of the central-heating
boiler's mains cord into the wall socket.
When the appliance is connected to the mains, the double display will show the supply temperature and the single
display the status of the appliance.
After the appliance is connected to the mains, an automatic air bleed programme for the boiler will be started. This
will take approx. 2 minutes.
The Ethos ..C appliance has a built-in hot water supply and the boiler will start by heating up the DHW coil.
Adjust the room thermostat to a high value, which will ignite the burner after heating up the tap water.
The appliance will ignite electronically several times until a flame is produced (max. 5 times); if no ignition is
obtained after several attempts; check whether an initial gas pressure is present and if the gas valve is adjusted
correctly.
Use the screw [3] on the gas control valve for measuring the initial gas pressure.
5.8 Heat input adjustment and setting
Adjust the boiler heat input by measuring the CO2 percentage when checking or installing a new gas control valve.
By measuring the CO2 percentage, both the min. and max. heat input can be adjusted. First adjust the max.
heat input and then the min. heat input.
5.8.1 Max. heat input setting
Pressing the ’–’ and ’+’ buttons simultaneously (3 sec.) = Gas valve adjusting mode
for 10 minutes, (display shows an ’H’ or ’L’). By pressing the ’+’ button, the high
position speeds can be accessed. The display alternately shows the speed in
hundreds (e.g. 6.2 is 6,200 rpm) and an ’H’.
If required, the max. input can be adjusted by using the adjusting screw [2]. Turning
the adjusting screw to the left (anticlockwise) will increase the max. heat output.
Turning the adjusting screw to the right (clockwise) will reduce the max. heat
output (see arrows under the adjusting screw). Adjust the max. input, if necessary
5.8.2 CO2 settings
Type of gas
Natural gas
G20
Propane
Injector None None
Wobbe index (Ws )(gross)
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General