starter arrangements. This model was previously
manufacturered by two companies, the C-O-Two
Fire Equipment and the Norris Fire and Safety
Equipment.
The SC-5 motor is mounted on a sliding,
adjustable base so that its position maybe altered
to take up any slack that may develop in the drive
belt.
The SC-5 pump is a single-cylinder design with
a working pressure of approximately 3500 pounds
per square inch. This unit has the capability of
transferring approximately 80 percent or 38
pounds of carbon dioxide from a fully charged
50-pound supply cylinder.
.
The pump head is fitted with a flangible
safety disc. This safety disc is designed to relieve
pressure in the pump at 2650 to 3000 pounds per
square inch. The safety disc nut prevents any
recoil in the event the safety disc ruptures. As you
can see in figure 3-2, the safety disc washer is
arranged so you can easily replace it.
The lubricating system is an automatic con-
trolled splash type. The oil flow is regulated by
a fixed orifice in the oil trough. This action
cannot be seen in figure 3-2. A good grade of SAE
viscosity #30 automotive oil should be used when
you change or add oil.
The drive from the motor to the pump is a
combination of V-belt drive pulleys and gears.
The small gear and large pulley are assembled
together as a unit and are both fitted with ball
bearings and mounted on the idler shaft. Both
pulleys are carefully balanced. A single guard is
secured over both gears and pulleys.
The motor, furnished as standard equipment,
is a 1-horsepower capacitor start induction type.
It is suitable for operation on either a 110- or
220-volt, single-phase, 60-hertz circuit. (A dc
motor is also available.) An enclosed control
switch is located on the side of the motor.
INSTALLING AND SERVICING
NEW EQUIPMENT
After receiving the equipment, you should
examine the components for damage. If the unit
is damaged, do not attempt to repair it. Return
it to the supply officer for reshipment to the
manufacturer.
Since the oil was drained from the crankcase
of the pump before it was shipped to the field
activities, be sure to fill it with a standard grade
of SAE #30 lubricating oil before you start the
unit. On pumps equipped with an oil filler plug
and measuring stick, fill them only to the upper
groove on the stick. On a unit equipped with an
oil cup and no measuring stick, fill it to within
one-fourth inch of the top of the cup. Other than
the crankcase, only one point on the pump
requires lubrication. This point is on the shaft
of the idler gear and pulley and is equipped
with an Alemite lubrication fitting. In spite
of the fact that the pulley shaft was lubricated
at the factory, it is advisable to relubricate
the area with two or three applications (grease
gun shots) of light cup grease before you
s t a r t t h e u n i t . T h e m o t o r b e a r i n g s c o n t a in
enough grease to last for approximately 2 years
under average conditions.
Before running the pump, you must find an
electric circuit compatible to the motor or install
one in the shop. Unless otherwise specified,
motors are wired to operate on 110-volt, 60-hertz,
single-phase circuits. When 220-volt, 60-hertz,
single-phase current is available, the hookup of
the motor should be rearranged so that it can run
on this circuit. A 220-volt wiring diagram is shown
on the nameplate of the motor. The plug on the
end of the lead conducting the current to the
motor from the power outlet should be equipped
with a grounding wire, or third wire, which is
usually insulated by a white covering. Regardless
of whether a three-pronged plug or a pigtail
(coming out of the lead near a two-prong plug,
fitted with a clip) is used, the system to which you
attach this grounding wire must also be grounded
to protect the unit.
W A R N I N G
Before you attempt any work on the
electrical circuit, be sure the power source
is disconnected.
Always run-in a new pump or one that has
been idle for a long time. This action, accom-
plished with the CO2 h o s e s d i s c o n n e c t e d , is
performed as a check for lubrication to make
certain that all parts are thoroughly treated. After
you turn off the pump, wipe off all excess
lubricants.
Before you pump carbon dioxide, examine all
line connections on both the inlet and outlet hoses.
Make certain that all connections between the
components are tight. This is important since
carbon dioxide is stored under approximately 850
psi at an atmospheric temperature of 70°F. Use
a slow, steady pull to tighten connections with a
wrench no larger than 12 inches in length.
3-2