https://www.eberspaecher-na.com/fileadmin/data/countrysites/EB_Kanada/pdf/Hydronic_D5S-SC_Diagnostic___Repair_Manual_2013.pdfa. The fan provide air flow through the combustion chamber and the starting air hole
b. The glow pin heats the atomizer chamber in preparation for fuel.
c. Fuel first enters the atomizer hole.
d. It is then atomized and ignites.
e. The flame burns through the combustion chamber.
f. The flame detector recognizes a temperature rise and cuts operation of the glow pin.
g. The control unit measures the input and output coolant temperature via a coolant temperature sensors inserted in the coolant flow of the water jacket. This is important to know because the heater can monitor the tempera- ture difference to validate proper coolant ow. In the case of overheat codes refer to the appropriate codes.
h. The unit switches between full load, part load and standby automatically given the coolant temperatures.
i. When it first ignites it is always in boost.
ii. Mode is controlled via fuel pump frequency and fan speed.