Maintenance
Dräger PSS BG 4 plus 17
4.2 Disassembly of the closed-circuit
breathing apparatus
1. Open the closed-circuit breathing apparatus
(see chapter 3.3.1 on page 10).
2. Remove the compressed oxygen cylinder
(see chapter 4.2.1 on page 17).
3. Disconnect the breathing hoses (see chapter 4.2.2 on
page 17).
4. Disassemble and test the connecting piece
(see chapter 4.2.3 on page 17).
5. Remove the CO
2
absorber (see chapter 4.2.4 on page 17).
6. Remove and test the pressure relief valve
(see chapter 4.2.5 on page 18).
7. Remove the breathing air cooler (see chapter 4.2.6 on
page 18).
8. Remove the lever (see chapter 4.2.7 on page 18).
9. Remove breathing bag, drain valve, minimum valve and -
where applicable - the water absorber (see chapter 4.2.8
on page 19).
10. Remove the switch box (see chapter 4.2.8 on page 19).
11. Remove waist belt and shoulder straps (see chapter 4.2.10
on page 20).
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.
4. Unfasten the hand wheel from the pressure reducer. Do not
use any tools to unfasten.
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
.
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.
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 disengage.
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 disks out of the valve seats and test.
Dispose of any damaged valve disks.
5. If the closed-circuit breathing apparatus has a connecting
piece with condensate trap, open the sealing plug and
drain the condensate.
4.2.4 Removing the CO
2
absorber
1. Disconnect the breathing bag from the CO
2
absorber.
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 20).
WARNING
Ensure that the connections are not soiled with oil or
grease. To avoid death or serious injury never allow
pressurized oxygen to come into contact with oil,
grease or similar contaminants. Either a fire, an
explosion or both may also be caused.
1 see the instructions for use for the compressed oxygen cylinder
CAUTION
Risk of chemical burns!
The CO
2
absorber may contain alkaline liquid which
may leak out during disassembly!
Wear protective clothing, protective gloves and
goggles.
!
Draeger Training 11/16 rev 1
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