Lennox FCM 85 Installation, Operating And Maintenance Manual page 65

HEATING : GAS BURNER 180 & 240kW
PRESSURE ADJUSTMENTS
PRESSURE REGULATING VALVE TYPE VR 4605P
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 19) 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.20)
FLEXYII_WSHP-IOM-1307-E
ON HONEYWELL
Inlet pressure
measuring port
Fig. 19
Fig.20
High Heat Injection Pressure Checks
Check and adjust if necessary the valve OUTLET pressure
to 8.0mbar (G 20) / 10.4mbar for Groningen (G25) & 28.3
mbar for propane (G31) (fig.21)
The out pressure must be measured on the pressure tap
located on the gas injector support bar to avoid the
pressure drop due to the elbow after the valve
Fig. 21
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