Spasciani RC Manual Del Usuario página 12

3.3 DETAILED DESCRIPTION OF FUNCTIONAL PARTS AND COMPONENTS
The numbers refer to the position of the components in Figures 1, 2, 3 and 4 shows at the bottom of this booklet.
3.3.1 Two wheel trolley (1)
The trolley is available in two different dimensions depending on the capacity of the cylinders used.
The bigger one is designed to carry one or two 50 l cylinders, the smaller is designed to carry two or four cylinders
having a capacity from 6 to 9 litres. The trolley is provided with a reel for up to 50 m of medium pressure hose.
Both models have a side attachment for a second man, the bigger trolley is also provided with a container for outfits
and of a hook for holding the second hose.
ATTENTION:
- If more than one cylinder is mounted on a trolley make sure that they all have same dimensions and capacity in
order to grant stability of the system.
- In case of separate purchasing of cylinder always check with SPASCIANI that the dimensions of the cylinder you want
to mount on the trolley is compatible with the fixing systems on the trolley.
3.3.2 Cylinders (2)
See general description and technical data of some of the models available in our range in par. 4.
To use cylinders different than those indicated, be sure that they comply with the relevant requirements in the country
of application and that they are filled with breathable air according to EN 12021 and compatible with the fixing system on
the trolley (if present). Never use cylinders at a pressure higher than the working pressure of the apparatus.
3.3.3 Pressure reducer RB (3)
The reducer assembly contains the devices that deliver a constant pressure of 5.5 bar irrespective of cylinder pressure
until the alarm set point is reached.
As the cylinder/s pressure drops to the alarm set point (55±5 bar for the reducer mounted on the little trolley and 35±5
bar for the others) a special device increases the outlet pressure to 8.0 bar and so actuates the audible warning in the
demand valve. The alarm is repeated by the audible alarm fitted to the reducer.
The pressure reducer is directly connected to one or two high pressure hoses for the connection to the cylinder(s). The
cylinders attachment on the reducer is provided with non return valves.
The tube(s) are provided with EN 144 standard screw connector for the cylinder (s) connection and with a valve that
enables to vent the air off when the replacement on an empty cylinder is needed.
The reducer is mounted on a metal body that also comprises the part described in the paragraphs below and it can be
placed on a trolley, fixed to a high pressure line or on a cylinders pack.
RB complete group is made of the following parts:
- Acoustic warning at the trolley (21). It emits an intermittent signal when the air reserve drops below the alarm set
point and it works at the same time of the warning at the mask
- High pressure gauge (22)
- Medium pressure gauge (23)
- First medium pressure outlet. Normally in a trolley system this outlet is connected to a medium pressure tube (24)
feeding the breathing tube (6) placed on the reel. If the RB is not used on a trolley system this first outlet may be
provided with a female quick coupling (25) for the direct connection of the breathing tube
- Female quick coupling (25) to connect the second operator breathing tube.
3.3.4 Medium Pressure tube (6)
With quick safety and slip‐off proof connectors (11) in the following lengths: 5, 10, 20, 30, 40, 50 m. The quick
connections are Euro‐Coupling type (default) or Spasciani type (upon request). The supply hose is antistatic.
3.3.5 Supporting waist belt (8)
Adjustable belt supporting the feeding hose hung to the special safety hook (7).
3.3.6 Demand valve with audible warning device (4)
A reinforced plastic housing holds both the device that delivers the air and the audible warning. The button (17) locks
the device which is then unlocked by the first breath‐in.
After the first inhalation which releases the device (17), the demand valve injects the necessary quantity of air into the
mask and keeps a positive pressure no matter what the demand.
As the pressure drops below the alarm set point (55 +/‐ 5 bar for the reducer mounted on the little trolley and 35±5
bar for the others) the medium pressure suddenly increases to 8 bar thus actuating the audible warning at the mask.
With every inhalation it is then produced a sounding vibration which will continue till the air reserve is completely used
up. The position of the warning device at the mask, being close to the operator's ears, makes it possible to hear the
whistle even in the noisiest environment. The audible warning, moreover, does not waste any air since the sound is
made by the air being breathed. The demand valve can be of type A or BN according to the connector provided.
NB: the alarm system to the mask only works if a RB reducer Spasciani is used.
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