Wolf MGK-130 Instructions Manual page 11

3. Setting the gas / air mixture prior to replacing the boiler coding card for conversions from LPG to natural
gas
Settings must be made with the natural gas boiler coding card to be able to set the lower output in
NB
soft start for LPG P.
Carry out the adjustments in the order given below. At the factory, the gas combination valve has
NB
been set up for natural gas H (G20). Only adjust the gas combination valve after the system has been
changed to a different gas type.
A) CO setting at the upper load (emissions test
2
mode) for natural gas
• Pivot the control unit lid down.
Unlock the casing cover with the l.h. and r.h.
turnbuckles. Release the bottom of the casing cover
and unhook at the top.
• Remove the screw from the l.h. "Flue gas" test port.
• Insert the test probe of the CO
the "flue gas" test port (approx. 120 mm).
• Turn the temperature selector to "Emissions test"
.
(Status indicator ring flashes yellow.)
• Ensure that the boiler is not limited electronically.
• Check the CO content at full load, and compare the
2
actual values with those in the table below.
• Correct the CO setting as required using the gas
2
throughput screw on the gas combination valve in
accordance with the table.
The upper load cannot be adjusted for LPG.
• Turn clockwise - lowers CO
• Turn anti-clockwise - raises CO
Appliance open (without casing) at upper load
G20
9.2% ± 0.2%
• Terminate the emissions test mode by returning the
temperature selector to its original position.
3062883_0910
CO settings
2
test instrument into
2
content
2
content
2
G31 (check)
11.0% ± 0.2%
Fig.: Flue gas test at the integral test port.
Fig.: Gas combination valve.
Test port
Gas flow
adjusting screw
(only for natural
gas)
11