Checking The Main Burner Flame Setting; Checking Flame Sensor - Buderus Logano G234X Instructions Manual

To adjust the ignition flame:
▶ Turn the inner adjustment screw clockwise to reduce the size of the
ignition flame.
-or-
▶ Turn the inner adjustment screw counterclockwise to increase the
size of the ignition flame.
▶ After adjustment, tighten the safety screw for the pilot orifice
pressure setting (Fig. 11, [5], page 10) again.

4.3.4 Checking the main burner flame setting

▶ Observe main burner flame [1] through the inspection hole in the
burner cover.
The flame must have a steady and fixed contour and generally has a
bluish color.
Fig. 13 Main burner
[1] Main burner flame
If the main burner flame meets the requirements:
▶ Check flame sensor ( Chapter 4.3.5).
If the main burner flame is weak or yellow or goes out:
▶ Turn the gas valve ON/OFF knob (Fig. 11, [1], page 10) clockwise to
the OFF position.
▶ Close main gas shut-off.
▶ Disconnect heating system from the power supply.
▶ Notify the service department or gas supplier.

4.3.5 Checking flame sensor

▶ Test the safety switch by closing the gas shut-off.
The main burner flame ( Fig. 13) and the ignition flame ( Fig. 12,
page 10) are extinguished.
After six (6) seconds at the most the main gas solenoid valve on the gas
valve must close with an audible noise. After 90 seconds the ignition
module must switch to lock status and stop generating sparks.
▶ Disconnect heating system from the power supply.
▶ Open main gas shut-off.
▶ Switch on unit power supply.
A normal operating cycle must follow.
Logano G234X – 6 720 805 917 (2012/12)
If the gas valve does not operate correctly:
▶ Immediately turn the gas valve ON/OFF knob [1] clockwise to the OFF
position.
▶ Close main gas shut-off.
▶ Disconnect heating system from the power supply.
▶ Notify the service department or gas supplier.
If the gas valve operates correctly:
▶ Turn gas valve ON/OFF knob [1] clockwise to OFF position.
▶ Close main gas shut-off.
▶ Disconnect heating system from the power supply.
▶ Set thermostat to the lowest value.
▶ Remove pressure test port and pressure gauge for measuring gas
supply pressure and orifice pressure from the gas valve.
▶ Close the openings with the screw plugs [2] and [3] again.
Fig. 14 Gas valve
[1] ON/OFF knob (in ON position)
[2] Screw plug for gas supply pressure test port
[3] Screw plug for orifice pressure test port
▶ Making the boiler ready for operation ( Chapter 4.2, page 9).
▶ Repeat all required steps (depending on the controls) described in
Chapter 4.2 and Chapter 4.3.
The heating system has now been started up again.
▶ Using a leak detecting spray, check the screw plugs [2] and [3] on the
gas valve for leaks.
If no leaks are found:
▶ Carefully wipe away the leak detecting spray to prevent corrosion
caused by the alkaline contents of the soap.
If leaks are found:
▶ Close main gas shut-off valve
▶ Turn the gas valve ON/OFF knob [1] clockwise to the OFF position.
▶ Disconnect heating system from the power supply.
▶ Seal leaks.
▶ Open main gas shut-off.
▶ Switch on unit power supply.
A normal operating cycle must follow.
4
Start up instructions
11