Lennox FCM 85 Installation, Operating And Maintenance page 63

HEATING : MODULATING GAS BURNER 60 & 120kW
P
RESSURE ADJUSTMENTS ON
VK4105MB
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 25) 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.26)
IOM – FLEXY II – 0308 – E
H
ONEYWELL PRESSURE
AND ON ELECTRONIC BOARD
Inlet pressure
measuring port
Fig. 25
Fig. 26
High & Low heat injection pressure check:
Electronic board W4115D1024
There is one board for two valves
230V power supply
OUTPUT
Solenoid valve power
supply
Regulating valve VK4105MB
Adjusting nut (5mm) Minimum
Pressure
Adjusting nut (8mm)
Minimum Pressure
Electrical connections
Potentiometer
called
« CURRENT »
Switches in
position 3 for an
output intensity
varying until
330mA
INPUT
Actuator 0/10V
Common (wire 01
of the 24V)
Page 62