Midco F400B-33 - Manual (Page 8)

XI REDUNDANT COMBINATION GAS
VALVE
The Combination Valve contains a Manual Gas Shut-Off,
Main Gas Pressure Regulator, and Automatic Electric
Main Gas Valve.
■ ■ The Combination Gas Valve is suitable for a maximum
pressure of 14.0" W.C.
■ ■ When the gas supply pressure is over 14.0" W.C.,
special regulators are required. See Section VI Piping.
■ ■ Should replacement or service be required, valve
manufacturer's instructions must be followed as outlined
in their information sheet.
■ ■ The Main Gas Pressure Regulator is adjustable for
outlet pressure range of 2.0" W.C. to 5.0" W.C.
■ ■ Outlet pressure settings must be checked while the
gas is flowing.
■ ■ To adjust outlet pressure, remove the seal cap for
access to the adjusting screw. Turning the screw
clockwise will increase outlet pressure, counter
clockwise will decrease outlet pressure.
XII S8680J ELECTRONIC CONTROL
■ ■ For operation characteristics refer to Honeywell
Control literature provided with burner.
XIII SPECIAL EQUIPMENT (OEM
VERSIONS)
Special equipment, either factory or contractor
installed, may cause variation in the procedures and
descriptions given in this manual.
Consult the OEM's manual to identify the differences in
the information.
FIGURE 7 General Assembly
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