Lennox BCK 020 Installation Operating & Maintenance Manual page 47

HEATING: gas burner
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.
Fig. 54
- Place the tube of the "accurate" manometer on the Inlet
pressure port figure 54 of the Gas Regulating Valve after
having loosened the screw by two turns
- Check and adjust if necessary the valve Inlet pressure to
20 mbar (G20) or 37 mbar for propane (G31) or 25 mbar for
Groningue (G25).
Fig. 55
High Heat Injection Pressure Checks
Check and adjust if necessary the valve OUTLET pressure
to 8.4 mbar (G 20) / 31.4 mbar for propane (G31) and
12.3mbar for Groningue (G25).
Fig. 56
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
Page 46 - IOM / ROOFTOP BALTIC Series - 0803 - E
Fig. 57
INLET
PRESSURE
MEASURING
PORT
Low Heat Injection Pressure Checks
-Carefully disconnect the wire on the coil of the valve as
shown below
Fig. 58
- Check and adjust if necessary the Outlet pressure to 3.5
mbar (G20) or 14 mbar for propane (G31) and 5 mbar for
Groningue(G25)
Fig. 59
Fig. 60
- Reconnect the wires on the coil
- Re-tighten all pressure adjustment screws and nuts.