Page 20 - Webster Service Manual

15
M34DK-3 SERIES FUEL UNITS
SINGLE STAGE UNITS
To meet the needs of today' s fuel-efficient, downsized
and space efficient burners, Webster's popular M34DK-3
incorporates improved access to both the bleed valve
and bypass plug. Locating the bleed port plug assembly
on the side of the fuel unit prov ides the service techni-
cian with one visible and accessible location to either
bleed the fuel unit or change the bypass plug without
removing the burner . The M34DK-3 retains all of the
industry accepted, state-of -the-art features of the
M34DJ-3 fuel unit. These include faster fuel cut-of f,
improved priming on one-pipe installations, and reduced
inlet line flow on two-pipe systems which results in
reduced line noise. W ebster's
M34DK-3 fuel unit is avail-
able in a single s tage,
3450
RPM model rated
at 3 GPH. Operating
pressure is factory
set at 100 psi and is
adjustable to 150 psi.
The M34DK-3 is capa-
ble of maintaining its 3
gallon per hour fire size
at up to 150 psi through-
out its service life.
M SERIES FUEL UNITS
SINGLE- AND TWO-STAGE
Light and extremely compact, the Webster M Series fuel
units have earned a reputation for reliability and efficiency.
All units include the W ebster internal rotary filter . The
rotary filter reduces the need for troublesome periodic
cleaning. Because the filter blades rotate at motor speed
with constant cleaning action, clogging is minimal compared
to units that use internal filter screen. For maximum pro-
tection, an additional line filter is recommended in accor-
dance with standard practice. Another popular feature is
the easy-to-bleed valve assembly located on the side. A
ā€œ
Dā€ drive reduces the harmful ef fects low-lubricity fuels
had on previous key-drive designs. Simple flange mount-
ing and side-located nozzle ports make the M Series
ideal for fuel unit servicing. M Series fuel units are available
in single- or two-stage, 1725 and 3450 rpm models with
capacities to 15 gph.