Lennox FCM 85 Installation, Operating And Maintenance page 52

HEATING : GAS BURNER 60 & 120kW
PRESSURE ADJUSTMENTS ON HONEYWELL
PRESSURE REGULATING VALVE TYPE VK 4125 P
Pressure regulator adjustment with 300mbar 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 (Figure 15) of the Gas Regulating Valve after
having loosened the screw by one turn
Check and adjust if necessary the valve Inlet pressure to
20.0mbar (G20) or 25.0mbar for Groningen (G25) or
37.0mbar for propane (G31) after gas burner ignition
(fig.16)
IOM – FLEXY II – 0308 – E
High Heat Injection Pressure Checks
Check and adjust if necessary the valve OUTLET pressure
to 10.4mbar (G 20) / 13.1mbar for Groningen (G25) & 34.3
mbar for propane (G31) (fig.17)
INLET
PRESSURE
MEASURING
PORT
The out pressure must be measured on the pressure tap
located on the gas injector support bar to avoid the
Fig. 15
pressure drop due to the elbow after the valve
Fig. 17
Fig.16
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