SECTION IV.
OPERATING INSTRUCTIONS
4-1.
GENERAL.
This
section
describes
the
operating procedure, and the operating controls of the
Type I (Air) and Type II (Air/Oxygen) Servicing Units.
The Type I Servicing Unit carries eight (8) 3,500 psi
(24115 kPa) air supply cylinders. This Type I Servicing
Unit is designed to service up to four scuba cylinders at
one time. The Type II (Air/Oxygen) Servicing Unit carries
four 3500 psi (24115 kPa) air supply cylinders and four
2260 psi (15, 571 kPa) oxygen supply cylinders. The
Type II control panel provides the applicable dials,
gauges, lever and manifolds to provide for two servicing
outlets for both the air half and the oxygen half of the
Type 11I Servicing Unit.
4-2.
THEORY OF OPERATION. The servicing unit
is connected to either the breathable air source (20 cfm,
3200 psi air compressor) or oxygen source by attaching
a suitable service hose to the proper re-charge
receptacle. The control panels are protected by a safety
valve located in each manifold
4-3.
CHARGING MODE (Breathable Air or Oxygen).
A source of clean dry breathable air or breathable
oxygen Is attached to the recharging receptacle. The
breathable air cylinders can be charged to a maximum of
3500 psi, while the oxygen cylinders can be charged to a
maximum pressure of 2260 psi.
4-4.
The breathable air or oxygen can be channeled
from the compressed gas cylinders through the supply
manifold to the air/oxygen purifiers by opening the
manifold shut off valve The air/oxygen supply then
passes through the pressure regulator and servicing
valve to the scuba manifold. The breathable air system
and oxygen system are both protected by two safety
valves, located at the supply manifolds and the scuba
manifolds.
4-5.
The air/oxygen supply passes from the scuba
manifolds through the charging valves, flex hoses with
attached yoke adapters to the scuba tank or receiving
tanks. A method to mechanically bleed the breathable
air or oxygen systems has been designed into each
compressed gas system
4-6.
OPERATING CONTROLS AND INDICATORS
(See Figures 4-1 and 4-2) All controls and indicators
necessary for operation of the Type I (Air) and Type II
(Air/ Oxygen) Servicing Units are located on the control
panel or behind the control panel. Identification and
function of each control or indicator is as follows:
a.
Type I (Air) Servicing Unit
(1)
Air Cylinder Pressure Gauge (1, Figure 4-1)
These gauges are used to show the psig of
the air cylinders.
(2)
Cam Lever Valve (2, Figure 4-1) Primary
on-off valve controlling the pressure flow
from the air cylinders.
(3)
Shut-off Valve - Scuba Manifold (3, Figure
4- ) This valve is used to shut off the flow of
air to the scuba manifold, from the air
cylinders
(4)
Re-charge Valve (4, Figure 4-1) Control
valve for recharging of breathable air
cylinders Valve is maintained m the closed
position except when air system is being
recharged
(5)
Re-charge
Connector
(5,
Figure
4-1)
Servicing unit connection for the service
hose from the breathable air source
(6)
Charging
Valve
(6,
7,
Figure
4-1).
Open/closed control valve that is used only
when the breathable air scuba tanks are
being charged
(7)
Air Pressure Regulator (8, Figure 4-1). The
air pressure regulator is used to control the
psig of breathable air that enters the scuba
tanks through the scuba manifold
(8)
Service Pressure Gauge (9, Figure 4-1).
Gauge that indicates psig available for use
in charging scuba tanks.
(9)
Scuba manifold pressure gauge (10, Figure
4-1) This gauge indicates pressure build-up
in the scuba tanks as they are being
charged
(10) Charging Valve (11, 12, Figure 4-1) Open/
closed control valve that is used only when
the breathable air scuba tanks are being
charged
(11) Shut-off Valve, Supply Manifold (13, Figure
4-1). The supply manifold shut off valve is
used to isolate the supply manifold from the
purifier and scuba manifold.
(12) Bleed Valve (14, Figure 4-1). The bleed
valve is used when it is necessary to bleed
off sections of the air supply system, or the
total system
4-1
