Disassembly Of The Closed-Circuit Breathing Apparatus; Removing The Compressed Oxygen Cylinder; Removing The Breathing Hoses; Disassembling And Testing The Connecting Piece - Dräger PSS BG 4 RP Instructions For Use Manual

4.2 Disassembly of the closed-circuit
breathing apparatus
1. Open the closed-circuit
(see chapter 3.3.1 on page 51).
2. Remove the compressed oxygen cylinder (see chapter 4.2.1
on page 57).
3. Disconnect the breathing hoses (see chapter 4.2.2 on
page 57).
4. Disassemble and
(see chapter 4.2.3 on page 57).
5. Remove the CO absorber (see chapter 4.2.4 on page 57).
2
6. Remove and test the pressure relief valve (see chapter 4.2.5
on page 58).
7. Remove the breathing air cooler (see chapter 4.2.6 on
page 58).
8. Remove the lever (see chapter 4.2.7 on page 58).
9. Remove the breathing bag, drain valve, minimum valve and
where applicable the water absorber (see chapter 4.2.8 on
page 59).
10. Remove the switch box (see chapter 4.2.8 on page 59).
11. Remove waist belt and shoulder straps (see chapter 4.2.10
on page 59).
4.2.1

Removing the compressed oxygen cylinder

1. Ensure that the cylinder valve (2) is closed.
2. Release the anti-vibration strap (3).
3. Open the hook-and-loop fastener (1) and pull the strap out of
the buckle.
1
4. Unfasten the hand wheel from the pressure reducer. Do not
use any tools to unfasten.
WARNING
!
Ensure that the connection is not soiled with oil or
grease. To avoid death or serious injury never allow
pressurised oxygen to come into contact with oil,
grease or similar contaminants. Either a fire, an
explosion or both may also be caused.
5. Remove the compressed oxygen cylinder from the closed-
circuit breathing apparatus and seal with the lock nut.
Re-fill the compressed oxygen cylinder
1) see the instructions for use for the compressed oxygen cylinder
breathing apparatus
test the connecting
2
1)
.
4.2.2

Removing the breathing hoses

1. Open the safety straps on the shoulder straps.
2. Turn the bayonet rings on the closed-circuit breathing
apparatus anti-clockwise until they disengage.
piece
3. Take the breathing hoses off the closed-circuit breathing
apparatus.
4. Drain off the condensate that has accumulated in the
breathing hoses.
4.2.3

Disassembling and testing the connecting piece

1. Turn the bayonet rings on the connecting piece anti-
clockwise until they engage.
2. Take the breathing hoses off the connecting piece.
3. Remove the inhalation and exhalation valve seats from the
connecting piece.
4. Take the valve discs out of the valve seats and test. Dispose
of any damaged valve discs.
5. If the closed-circuit breathing apparatus has a connecting
piece with condensate trap, open the sealing plug and
3
drain the condensate.
4.2.4 Removing the CO
CAUTION
!
Risk of chemical burns!
The CO
may leak out during disassembly!
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Wear protective clothing, protective gloves and
goggles.
1. Disconnect the breathing bag from the CO
To do this, stretch the tab on the sleeve (1) and remove.
2. Unfasten the control line (2) from angled connector and switch
box (see chapter 4.2.11 on page 60).
1
3. Check that the control line is dry inside.
If necessary, use compressed air acc. to DIN EN 12 021 to
carefully blow-dry.
absorber
2
absorber may contain alkaline liquid which
2
Maintenance en
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absorber.
2
2
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57