Page 25 - Webster Service Manual

20
INSTALLATION DATA
M Series units may be used in one-or two-pipe installa-
tions They have vacuum capability up to 10” Hg on sin-
gle-stage units, 15” Hg on two-stage units including pip-
ing and lift losses. They are rated for use with #1 and #2
fuel oil or kerosene.
IMPORTANT:
Do not loosen or try to tighten any pump
plugs not to be used in the installation. NON HARDEN-
ING OIL PIPE DOPE IS RECOMMENDED for use on
the threads of all fittings. Teflon tapes or paste must be
used with care to prevent depositing tape pieces or
fibers into critical int ernal areas of the pump. Reduced
torque must be used with teflon materials to avoid
thread or casting damage EVIDENCE OF
TEFLON
MATERIAL IN INTERNAL AREAS OF THE FUEL UNIT
WILL BE CAUSE TO VOID WARRANTY.
Installation Notes:
Nozzle port pressure at cutof f is not less than 80% of
set pressure on all except -15 models. -15 models do
not have internal cutoff.
ʻFuel
unit inlet pressure should not exceed 3 psig in
order to comply with National Fire Protection
Association's Bulletin 31.”
M Series fuel units are available in standard C Style
(
counterclockwise rotation, nozzle port on left, as
viewed from shaft end) or D Style models (clockwise
rotation, nozzle port on right, as viewed from shaft end).
Important Rating Information
Recommended fire size (RFS) of pump decreases
as pump operating pressure is increased above 100
psi nominal rated pressure, except M34DK-3, which
is rated to 150 psi. For adequate service life, nozzle
flow at set pressure must not exceed RFS figures in
table below.
Max. UL listed operating press. = 135 psi (“K”-150 psi)
RFS at
RFS at RFS at
Pump Model
100
psi
135
psi
150
psi
M34-3, 2M34-3
3
gph 1 gph
M34-6, 2M34-6
6
gph 3 gph
M34-15, 2M34-15 15 gph 13 gph —
M17-6, 2M17-6
6
gph 3 gph
M17-15
15
gph 13 gph —
M34DK-3
3
gph 3 gph 3 gph