Repair manual
MT3855
2
REGULATED GAS PRESSURE
1. Let the oven run up to 510F (266C).
2. Set the time to 7 minutes. You may now verify
the operational and regulated gas pressures.
Incoming static gas pressure to the unit, with all the
gas appliances drawing from the supply, should be
a minimum of 5.5" W.C. (13.7 mbar) for natural gas
and 11" W.C. (28 mbar) for propane gas. The manĆ
ifold pressure, if measured after the regulator loĆ
cated inside the control box, must be 3.5" W.C. (9
mbar) for natural gas and 10" W.C. (25 mbar) for
propane gas.
The pressure can be checked at the tap on the dual
regulated gas valve or at the tap on the tee valve.
If pressure adjustments are needed, turn the adĆ
justing screw located under a screw cap on the left
front side of the dual regulated valve. Adjust the
gas pressure by turning the screw clockwise to
raise the gas pressure and counterĆclockwise to
lower the gas pressure. Be sure to reinstall the
screw cap; should the diaphragm rupture this cap
acts as a flow limiter
The air shutter disc on the burner blower motor, loĆ
cated inside the control box at the top of the asĆ
sembly, is factory adjusted to provide the most effiĆ
cient blue flame possible at sea level. Visually
examine the flame to verify it's quality. Should it
need adjustment, increase or decrease the air mixĆ
ture to attain the best flame quality.
Pressure
Tap
Regulator Cap
Regulator
Adjustment
Pressure Regulator (U.S. models)
Regulator
Cap
Regulator
Adjustment
Outlet
Pressure
Tap
Pressure Regulator (Some export models)
Inlet
Pressure Tap
FIGURE 2