Lennox ROOFTOP FLEXY FXK 100, Installation, Operating And Maintenance, Page: 52 / 110

IOM – FLEXY II – 1007 – E Page 50
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
hav ing loosened the screw by one turn
Check and adjust if necessary the valv e Inlet pressure to
20.0mbar (G20) or 25.0mbar f or Groningen (G25) or
37.0mbar for propane (G31) after gas burner ignition
(f ig.16)
High Heat Injection Pressure Checks
Check and adjust if necessary the valv e OUTLET pressure
to 10.4mbar (G 20) / 13.1mbar f or Groningen (G25) & 34.3
mbar f or propane (G31) (f ig.17)
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 v alve
Fig. 15
Fig. 17
Fig.16
HEATING : GAS BURNER 60 & 120kW
INLET
PRESSURE
MEASURING
PORT