Lennox FCM 85 Installation, Operating And Maintenance page 66

HEATING : MODULATING GAS BURNER 180 & 240kW
P
RESSURE ADJUSTMENTS ON
VR4605MB
REGULATING VALVE
W4115D1024
Pressure regulator adjustment with 300mbars 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 27) 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) after
gas burner ignition (fig.28)
FLEXYII-IOM-0409-E
H
ONEYWELL PRESSURE
AND ON ELECTRONIC BOARD
Inlet pressure
measuring port
Fig. 27
Fig. 28
High & Low heat injection pressure check:
Electronic board W4115D1024
There is one board per valve
230V power supply
OUTPUT
Solenoid valve power
supply
Regulating valve VK4605MB
Potentiometer
called
« CURRENT »
Switches in
position 3 for an
output intensity
varying until
330mA
INPUT
Actuator 0/10V
Common (wire 01
of the 24V)
Shaft
Adjusting nut (7mm)
Maximum Pressure
Adjusting nut (9mm)
Minimum Pressure
Electrical
connections
Page 65