Lennox BAC 030 SNM 3M Installation, Operating And Maintenance Manual page 61

MODULATING GAS BURNERS
Pressure adjustments on honeywell pressure regulating
valve type vk 4105 g
Pressure regulator adjustment with 300 mbar gas supply:
• the burner must run in high heat mode for this check.
• place the tube of the "accurate" manometer on the inlet pressure
port of the gas regulating valve after having loosened the screw
by one turn
Inlet pressure
High heat adjustment
underneath
• Check and adjust if necessary the valve inlet pressure to
20 mbar (G20) (or 25 mbar for G25) after gas burner ignition
BALTIC-IOM-0412-E / Service manual
High heat injection pressure checks
• place the tube of the "accurate" manometer to the out port on
the gas injector support bar after having loosened the screw
by one turn.
Low heat adjustment
Check and adjust if necessary the valve outlet pressure to 8,4 mbar
(G20) (or 12,3 mbar for G25)
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