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Aqua Lung MRS III - User Manual

Aqua Lung MRS III
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MRS III
Mobile Rell System
for the Aqua Lung SEA
(Survival Egress Air)
January, 2016
Operation and
Maintenance Manual

Table of Contents

Questions and Answers

  • J
    Justin JonesSep 9, 2025
    What to do if fill valve knob turns but does not operate valve on Aqua Lung Security Sensors?
    • M
      Maria EdwardsSep 9, 2025
      Replace the valve knob or rebuild the valve.
  • R
    Ronald PerezAug 23, 2025
    Why is my Aqua Lung Security Sensors regulator leaking?
    • R
      ritterjulianAug 23, 2025
      First, make sure the leak is actually coming from the regulator and not a fitting. If it is a fitting, see 'Leak at Fittings'. If it is the regulator, rebuild or replace it.
  • T
    Tracy BrooksAug 25, 2025
    How to fix a leak at the fitting of Aqua Lung MRS III Security Sensors?
    • P
      Patricia HillAug 25, 2025
      Inspect the fitting for damage, and replace it if damaged. If the fitting is loose and it's a pipe thread fitting, remove it, replace the Teflon tape, and reinstall it in the same orientation. Compression and flare fittings can be tightened without removing them. If these steps don't resolve the leak, replace the fitting.
  • A
    Alfred WestAug 27, 2025
    What to do if Aqua Lung MRS III have leaks at hose?
    • J
      jamesmcdowellAug 27, 2025
      Check the hose fittings to ensure they are tight. If the leak isn't at a fitting, then replace the hose.
  • A
    Amber Montoya DVMAug 27, 2025
    Why is the gauge reading incorrect on my Aqua Lung MRS III Security Sensors?
    • R
      Robert MurphyAug 28, 2025
      Have a calibration technician verify the accuracy of the gauge. If it's inaccurate, replace the gauge.
  • D
    David SinghSep 22, 2025
    What to do if Aqua Lung Security Sensors MRS III exceeds 15 years from manufacture date?
    • A
      Amber KaufmanSep 22, 2025
      Contact Breathing Air Systems to see if the supply cylinders life has been extended beyond 15 years. If not, replace the supply cylinders.
  • D
    Donna HoustonSep 16, 2025
    What to do if Aqua Lung Security Sensors MRS III case is damaged?
    • J
      jmcfarlandSep 16, 2025
      Replace the case.
  • J
    Joseph RobinsonSep 18, 2025
    What to do if Aqua Lung Security Sensors MRS III metal frame is damaged?
    • J
      jkingSep 18, 2025
      If the damage is minor, the metal can be straightened using standard shop practices and hand tools. If the damage is major, replace the MRS-III.
  • C
    Christopher IngramSep 7, 2025
    How to fix leaks at inline bleeder on Aqua Lung Security Sensors?
    • M
      Melissa DonovanSep 7, 2025
      Tighten the valve knob by hand. If the valve is already tight, replace the valve seat or the entire inline bleeder.
  • D
    Daniel RodriguezSep 4, 2025
    How do I fix leaks at the fill connector swivel on Aqua Lung MRS III?
    • S
      Stephanie LeeSep 4, 2025
      Rebuild the fill connector swivel joint or replace the fill connector.

Summary

MRS III Operation and Maintenance Manual

MRS-III Operating Instructions

Provides instructions for operating the MRS-III Mobile Refill System.

Cautions

Lists important safety precautions for using the MRS-III system.

Warnings, Cautions, and Notes

General Safety Precautions

Summarizes critical warnings, cautions, and notes for safe operation and handling.

Unit Description and Configuration

1.0 Description of Unit

Details the purpose and capabilities of the MRS III Mobile Refill System.

2.0 Configuration

Identifies the components and layout of the complete MRS III unit.

Preparation and Operation

3.0 Preparation for Use

Steps to prepare the unit for operation, including unpacking and checking.

4.0 MRS III Operating Instructions

Step-by-step guide for operating the MRS III system.

General Warnings

8.0 Warnings

Lists critical safety warnings regarding high pressure and misuse of the unit.

MRS III Maintenance

9.0 1-Year Service

Procedure for annual maintenance of the MRS III unit.

Cylinder Inspection and Gauge Calibration

12.0 Cylinder Inspection Guidelines

Criteria for inspecting cylinders for damage and serviceability.

14.0 Gauge Calibration

Procedure for verifying and calibrating system pressure gauges.

5-Year Maintenance and Valve Rebuilds

15.0 5-Year Service

Procedures for 5-year service, including cylinder hydrostatic testing.

15.5 Fill Valve Rebuild

Steps to rebuild the fill valve (YVA3010A).

15.6 Supply Cylinder Valve Rebuild

Steps to rebuild the supply cylinder valve (VAL1).

Regulator and Case Information

16.0 MRS III Regulator Rebuild

Procedure for removing and rebuilding the preset regulator (1120).

17.0 MRS III Case

Information regarding the Pelican case, including warranty.

Trouble Shooting Chart

Problem and Action Guide

Lists common problems and recommended actions for troubleshooting the MRS III.

Illustrated Parts Breakdown

Front of Unit

Identifies parts of the MRS III unit as viewed from the front.

Illustrated Parts Breakdown - Side View

Side View

Identifies parts of the MRS III unit as viewed from the side.

Illustrated Parts Breakdown - End View

End View

Identifies parts of the MRS III unit as viewed from the end.

Maintenance Kits and Overhaul Procedures

Maintenance Kits Overview

Lists parts included in the 1-year and 5-year maintenance kits.

Check Valve Overhaul

Procedure for overhauling the check valve.

PRS6 Overhaul and Regulator Procedures

PRS6 Overhaul

Procedure for overhauling the PRS6 fitting.

Preset Regulator Overhaul

Procedure for overhauling the preset regulator.

Valve Parts Breakdown

Fill Valve Assembly Parts

Parts breakdown for the Fill Valve (YVA3010A).

Supply Cylinder Valve Parts

Parts breakdown for the Supply Cylinder Valve (VAL1).

Supply Cylinder Valve Overhaul and Safety Disc

Supply Cylinder Valve Overhaul Kit

Parts list for the Supply Cylinder Valve Overhaul Kit (VAL1KIT).

Safety Disc Procedure

Procedure related to the safety disc for the supply cylinder valve.

Sea Fill Adapter Overhaul

Sea Fill Adapter Assembly (PRS-21)

Description and parts for the Sea Fill Adapter (PRS-21).

Adapter Overhaul Kit (PRS21 KIT)

Parts breakdown for the Sea Fill Adapter Overhaul Kit.

MRS III Flow Diagram

Flow Diagram Components

Lists and describes components shown in the MRS III flow diagram.

Pelican Case Dimensions

Case Top Internal Geometry

Technical drawing with internal dimensions for the Pelican case top.

MRS III Weight and Case Bottom Dimensions

MRS III Weight Specifications

Specifies the empty and full weight of the MRS III unit.

Case Bottom Internal Geometry

Technical drawing with internal dimensions for the Pelican case bottom.

Aqua Lung MRS III Specifications

General IconGeneral
BrandAqua Lung
ModelMRS III
CategorySecurity Sensors
LanguageEnglish