Kidde Fire Systems Natura User manual

P/N 06-237620-001
June 2020, Rev. AB
EXPORT INFORMATION (USA)
Jurisdiction: EAR
US ECCN: EAR99
This document contains technical
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Kidde Fire Systems
Natura™ Inert Gas
Fire Suppression System
Owner’s Manual
with FM Approval and UL Listing
EXPORT INFORMATION (USA)
Jurisdiction: EAR
US ECCN: EAR99
This document contains technical
data subject to the EAR

P/N 06-237620-001 i June 2020
FOREWORD
This manual is written for those who own or are responsible for Kidde Fire Systems Natura™Inert Gas Fire
Suppression System (Natura IGS system) with IG-01, IG-55, IG-100, or IG-541 or IG-100 (herein refer to
collectively as the “Agent”) manufactured after June 2018.
IMPORTANT
Kidde Fire Systems assumes no responsibility for the application of any systems other than those addressed
in this manual. The technical data contained herein is limited strictly for information purposes only. Kidde
Fire Systems believes this data to be accurate, but it is published and presented without any guarantee or
warranty whatsoever. Kidde Fire Systems disclaims any liability for any use that may be made of the data
and information contained herein by any and all other parties.
The Natura IGS System is to be designed, installed, inspected, maintained, tested and recharged by
authorized, trained personnel in accordance with the following:
• Standard of the National Fire Protection Association No. 2001, Edition 2015 titled Clean Agent Fire
Extinguishing Systems.
• Standard of Gaseous Fire Extinguishing Systems from International Organization for Standardization
(ISO 14520)
• Standard of Fixed Fire Fighting Systems – Gas Extinguishing Systems from the British Standards and
Codes of Practice for the Fire Industry (BS EN 15004-1)
• All instructions, limitations, etc. contained in this manual and in the Kidde Fire Systems®Inerts Gas
Engineered Fire Suppression System Design, Installation, Operation and Maintenance Manual with FM
Approval (Natura IGS DIOM), P/N 06-237619-001.
• All information contained on the system cylinder nameplate(s).
Storage, handling, transportation, service, maintenance, recharge and test of agent storage cylinders shall
be performed only by qualified and trained personnel in accordance with the information in this manual and
Compressed Gas Association pamphlets C-1, C-6 and P-1:
• C-1, Methods for Hydrostatic Testing of Compressed Gas Cylinders.
• C-6, Standards for Visual Inspection of Compressed Gas Cylinders.
• P-1, Safe Handling of Compressed Gases In Containers.
The system must be designed, installed, operated and maintained only in accordance with the following
documents and specifications:
• Natura IGS DIOM, P/N 06-237619-001, available from the Kidde Fire Systems distributor or from
Kidde Fire Systems directly.
• CGA pamphlets are published by the Compressed Gas Association: http://www.cganet.com
• National Fire Protection Association Standard No. 2001, Edition 2015, available from:
www.NFPA.org
• ISO Standard of Gaseous Fire Extinguishing Systems available from:
www.ISO.org
• British Standards and Codes of Practice for the Fire Industry are available from:
www.bsigroup.com
Questions concerning the information presented in this manual should be addressed to:
Kidde Fire Systems
400 Main Street
Ashland, MA 01721
Phone: [phone]
Fax: [phone]
www.kiddefiresystems.com
Email: [email protected]

June 2020 ii P/N 06-237620-001
ATTENTION INSTALLERS
This form must be signed by the system owner indicating that he/she has received a copy of this Owner’s
Manual, P/N: 06-237620-001. Have the system installer fill in this form. Retain a copy of this form for your
records.
1. System Installed:
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
2. Listing of Major System Components:
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
3. Description of Hazard Protected by System:
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
Owner or Authorized Representative
Date
____________________________________________
Title
____________________________________________

P/N 06-237620-001 iii June 2020
SAFETY SUMMARY
Safety precautions are essential whenever electrical or mechanical equipment is involved. Take precautions
when handling, servicing and/or charging agent Fire Suppression Systems Cylinders. Using this equipment
with the respect and caution demanded will considerably lessen the possibility of personal injury. If safety
precautions are overlooked or ignored, personal injury or property damage could occur.
The following symbols are used throughout this manual. Always heed these precautions. They are essential
to the safe use of the equipment described in this manual.
DEFINITIONS
The following safety precautions should always be followed:
1. Read and understand this manual and the other documents referenced herein.
2. The valve Anti-recoil Safety Cap and Safety Transport Cap, Guard, or Shroud MUST be installed on
the cylinder valve at all times and only removed when installed or performing charging, testing, or
salvaging operations in accordance with the procedures contained in this manual.
3. Wear all proper personal protective equipment (PPE) when working with pressurized cylinders and
charging equipment
4. Make sure that all release units or slave gauge cylinders have been removed from the cylinder valves
before transportation. Ensure the Anti-recoil safety cap is installed before performing any charging,
leak tests or salvage operations.
Don’t get careless. Never assume a cylinder is empty. Treat all cylinders as if they are fully charged.
Smoking is prohibited in agent and nitrogen fill and charging areas.
SAFETY DATA SHEETS
Hard copies of the Safety Data Sheets (SDS) are not included with this manual. The latest version of the
SDS can also be found online at the Kidde Fire Systems website (www.kiddefiresystems.com). Use the
built-in navigation links to view the desired sheet.
WARNING
The warning symbol identifies immediate hazards and provides specific
instructions or procedures which if not correctly followed will result in severe
personal injury or death.
CAUTION
This caution symbol identifies specific instructions or procedures which if not
correctly followed could result in minor personal injury or equipment or
property damage.
WARNING
Pressurized (charged) cylinders are capable of violent discharge and, as
such, are extremely hazardous. Pressurized cylinders must be handled safely
to avoid accidents that could cause bodily injury, death, or property damage.

June 2020 iv P/N 06-237620-001
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P/N 06-237620-001 v June 2020
Foreword ...................................................................................................... i
Attention Installers ......................................................................................... ii
Safety Summary............................................................................................. iii
Safety Data Sheets ......................................................................................... iii
Table of Contents............................................................................................ v
CHAPTER 1 GENERAL INFORMATION
1-1 Introduction ........................................................................................ 1-1
1-2 Safe Cylinder Handling Procedures ......................................................... 1-2
1-2.1 Transporting Container ......................................................................... 1-2
1-2.2 Rough Handling ................................................................................... 1-2
1-2.3 Storage .............................................................................................. 1-2
1-2.4 Anti-recoil safety cap............................................................................ 1-2
1-2.5 Safety Transportation Cap, Guard, or Shroud........................................... 1-2
1-3 About the System ................................................................................ 1-3
1-4 Agents Overview.................................................................................. 1-3
1-4.1 Agent Safety Concentrations ................................................................. 1-3
1-4.2 IG-100 (Nitrogen) ................................................................................ 1-5
1-4.3 IG541 (Nitrogen, Argon, and Carbon Dioxide) .......................................... 1-7
1-4.3.1 Purity ................................................................................................. 1-7
1-4.4 IG-55 (Nitrogen and Argon) .................................................................. 1-10
1-4.4.1 Purity of Argon and Nitrogen ................................................................. 1-10
1-4.5 IG-01 (Argon) ..................................................................................... 1-13
CHAPTER 2 INSTALLATION AND MAINTENANCE
2-1 Introduction ........................................................................................ 2-1
2-2 Installation.......................................................................................... 2-1
2-3 Agent Storage Cylinders....................................................................... 2-2
2-4 Instructions in Case of Fire.................................................................... 2-2
2-4.1 Automatic Operation ............................................................................ 2-2
2-4.2 Local Manual Operation (Single Area) ..................................................... 2-2
2-4.3 Local Manual Operation (Multi Area System) ............................................2-2
2-4.4 Post-Fire Operation .............................................................................. 2-3
2-5 Main and Reserve Systems....................................................................2-3
2-6 Maintenance Procedures ....................................................................... 2-4
2-6.1 Preventative Maintenance Schedule........................................................ 2-4
2-7 Weekly ............................................................................................... 2-6
2-7.1 Check Natura IGS System Cylinder Pressure............................................ 2-6
2-7.2 Check Nitrogen Pilot Cylinder Pressure.................................................... 2-6
2-7.3 Hazard and Enclosure Inspection............................................................ 2-6
2-7.4 Pipework and Controls Inspection........................................................... 2-6
2-8 Monthly .............................................................................................. 2-6
2-8.1 Perform General Inspection ................................................................... 2-6
2-8.1.1 Inspect Discharge Nozzles..................................................................... 2-6
2-8.1.2 Inspect Pull Stations............................................................................. 2-6
2-8.1.3 Inspect Pressure Switches..................................................................... 2-7
2-8.1.4 Personnel............................................................................................ 2-7
2-8.2 Inspect Hazard Access .......................................................................... 2-7
TABLE OF CONTENTS

June 2020 vi P/N 06-237620-001
TABLE OF CONTENTS (CONT.)
2-8.3 Inspect Hoses ..................................................................................... 2-7
2-8.4 Inspect Release Units and Slave Gauge Assemblies .................................. 2-7
2-8.5 Inspect Cylinder and Valve Assembly...................................................... 2-7
2-8.6 Inspect Electric Control Heads on Nitrogen Pilot Cylinders.......................... 2-7
2-8.6.1 Inspect Brackets, Straps, Cradles and Mounting Hardware......................... 2-7
2-8.7 Semi-Annual and Other Inspections........................................................ 2-7
2-9 Additional Requirements ....................................................................... 2-8

General Information
P/N 06-237620-001 1-1 June 2020
CHAPTER 1
GENERAL INFORMATION
1-1 INTRODUCTION
This document is provided to instruct and familiarize the owner with the Kidde Fire Systems
Natura™Inert Gas Fire Suppression System (Natura IGS system) with IG-100, IG-541, IG-55,
or IG-01 or IG-55 (herein refer to collectively as the “Agent”). This manual covers:
• Information about the system
• How the Natura IGS system operates
• How the agents works
• Instructions in case of fire
• Post-operation instructions
• Inspection and maintenance of the system
• Responsibilities and related equipment requirements
Important: This owner's manual does not cover every detail of step-by-step installation
procedures for the Natura IGS systems.
The system consists of components tested within the limitations defined in the detailed Natura
IGS DIOM, P/N 06-237619-001. The system designer must be consulted whenever changes
are planned for the system or area of protection.
A certified Kidde Fire Systems distributor must be consulted after the system has been
discharged. The technical data contained herein is limited strictly for informational purposes
only.
Follow the instructions in this manual and on the cylinder nameplates. Review this information
semi-annually, or as needed. Place this manual in an accessible place near the fire suppression
system for ready reference.
Kidde Fire Systems believes this data to be accurate, however, it is published and presented
without any guarantee or warranty whatsoever. Kidde Fire Systems disclaims any liability for
the information contained herein by any, and all, other parties.
NAME OF KIDDE FIRE SYSTEMS DISTRIBUTOR IS:
_____________________________________________________________
ENTER EMERGENCY NUMBER FOR THE LOCAL FIRE DEPARTMENT HERE:
_____________________________________________________________
Before handling Kidde Fire Systems products, all personnel must be trained in the safe handling
of the cylinders as well as in the correct procedures for installation, removal, filling and
connection of other critical devices, such as solenoids, cable assemblies, pressure switches and
safety caps. READ, UNDERSTAND and ALWAYS FOLLOW the operation and maintenance
manuals, owner’s manuals, service manuals, etc., that are provided with the individual
systems.
CAUTION
It is the owner's responsibility to read, understand, and follow the
instructions in this manual and to ensure correct system operation and
personnel safety.

General Information
June 2020 1-2 P/N 06-237620-001
1-2 SAFE CYLINDER HANDLING PROCEDURES
Before handling Natura IGS products, all personnel must be trained in the safe handling of the
containers as well as in the proper procedures for installation, removal, filling, and connection
of other critical devices, such as flex hoses; actuation devices; pressure monitoring devices;
transportation safety caps, guards, or shrouds; and anti-recoil devices.
READ, UNDERSTAND and ALWAYS FOLLOW the design, installation, operation and
maintenance manuals, owners manuals, service manuals, etc., that are provided with the
individual systems.
1-2.1 Transporting Container
Containers must be shipped securely either upright in steel stillages or horizontally on pallets
using a minimum of 3 bands to secure the container/s to the pallet.
On site, containers must not be rolled, dragged, or slid, nor allowed to be slid from tailgates of
vehicles. A suitable hand truck, fork truck, single cylinder trolley, roll platform, or similar device
must be used.
1-2.2 Rough Handling
Containers must not be dropped or permitted to strike violently against each other or other
surfaces.
1-2.3 Storage
Containers must be stored standing upright where they are not likely to be knocked over or
the containers must be secured.
1-2.4 Anti-recoil safety cap
• Each Agent cylinder is factory equipped with an anti-recoil safety cap installed on the valve
discharge outlet, and securely fixed to the valve via a stainless steel, PVC coated cable to
prevent loss. This device is a safety feature, and will prevent discharge when installed if the
cylinder is actuated accidentally.
• The anti-recoil safety cap must be installed on the valve outlet AT ALL TIMES except when
the cylinders are connected into the system piping.
1-2.5 Safety Transportation Cap, Guard, or Shroud
The Safety Transportation cap, guard, or shroud is factory installed on the cylinder. The safety
transportation cap, guard, or shroud covers the cylinder valve to protect it during
transportation and handling. No attachments (release unit or slave gauge assemblies) are to
be connected to the cylinder valve during shipment, storage, or handling.
For additional information on safe handling of compressed gas cylinders, see CGA Pamphlet P1
titled “Safe Handling of Compressed Gases in Containers.” CGA pamphlets may be purchased
from the Compressed Gas Association: http://www.cganet.com.
WARNING
Pressurized (charged) cylinders are capable of violent discharge and, as such,
are extremely hazardous. Pressurized cylinders must be handled safely to avoid
accidents that could cause bodily injury, death, or property damage.
WARNING
The instructions contained in this foreword and throughout the manual must be
followed in the exact sequence as written to prevent serious injury, death, or
property damage.

General Information
P/N 06-237620-001 1-3 June 2020
1-3 ABOUT THE SYSTEM
The fire suppression system is designed for suppression of the fire classes listed in Table 1-1.
Different standards have different fire classifications.
1-4 AGENTS OVERVIEW
Natura IGS systems are approved for use with the following four Agents:
• IG-100: Fixed fire extinguishing systems that use the pure inert gas Nitrogen
• IG-541: Fixed fire extinguishing systems that use inert, gaseous mixture of 52% Nitrogen,
40% Argon, and 8% Carbon Dioxide
• IG-55: Fixed fire extinguishing systems that use inert, gaseous mixture of 50% Nitrogen
and 50% Argon
• IG-01: Fixed fire extinguishing systems that use the pure inert gas Argon
The gases used in Natura IGS systems occur naturally within the earth’s atmosphere. Carbon
Dioxide constitutes approximately 0.04%, Nitrogen constitutes approximately 78%, and Argon
approximately 0.9% of the atmosphere. As a result, the global warming effect of the Natura
IGS systems is zero, the Ozone depleting factor is zero, and the atmospheric lifetime is not a
consideration as the gases are benign to the environment.
1-4.1 Agent Safety Concentrations
Natura IGS agents are used at relatively high concentrations to extinguish fires, typically in the
range of 40 to 50% agent in air, or more. At a Natura IGS agent concentration of 45%, the
residual oxygen concentration is 11.5%, compared with 21% in normal air. The principal health
risk from exposure to atmospheres having such low oxygen concentrations is "hypoxia,"
meaning insufficient oxygen concentration in the blood. The resulting guidelines for exposures
to atmospheres flooded with Natura IGS agents are as follows:
• Unnecessary exposure to Natura IGS agent systems resulting in low oxygen atmospheres
shall be avoided.
• The maximum exposure time in any case shall not exceed 5 minutes.
• Unprotected personnel shall not enter the area during or after Agent discharge.
The following additional provisions shall apply:
• Natura IGS systems designed to concentrations below 43 percent (corresponding to an ox-
ygen concentration of 12 percent, sea level equivalent of oxygen) shall be permitted where
means are provided to limit exposure to no longer than 5 minutes.
• Natura IGS systems designed to concentrations between 43 and 52 percent (correspond-
ing to between 12 and 10 percent oxygen, sea level equivalent of oxygen) shall be permit-
ted where means are provided to limit exposure to no longer than 3 minutes.
Table 1-1. Fire Classifications
Description European
Standard
NFPA
Standard Asia
Combustible materials (wood, paper, fabric, refuse) Class A Class A Class A
Flammable liquids Class B Class B Class B
Flammable gas Class C Class B Class C
Electrical fire not classified
(formerly Class E)
Class C Class E

General Information
June 2020 1-4 P/N 06-237620-001
• Natura IGS systems designed to concentrations between 52 and 62 percent (correspond-
ing to between 10 and 8 percent oxygen, sea level equivalent of oxygen) shall be permitted
given the following:
– The space is normally unoccupied
– Where personnel could possibly be exposed, means are provided to limit the exposure
to less than 30 seconds
• Natura IGS systems designed to concentrations above 62 percent (corresponding to 8 per-
cent oxygen or below, sea level equivalent of oxygen) shall be used only in unoccupied ar-
eas where personnel are not exposed to such oxygen depletion.
Note: The term "…sea level equivalent of oxygen…," used above, deserves some clarification.
The allowed exposure limit to air diluted with Natura IGS agents relates to the residual
oxygen concentration. At sea level the atmospheric pressure is 14.7 psi (101,325 Pa).
The sea level equivalent of oxygen is the "partial pressure" of oxygen in air when the
atmospheric pressure is 14.7 psi. The volume fraction of air that is oxygen is 0.21, or
21%. Thus, at sea level the partial pressure of oxygen in air is 3.09 psi (21,290 Pa).
Thus, the provisions outlined above can be summarized in as shown in Table 1-2.
https://en.w ikipedia.org/
Table 1-2. Egress time limits for spaces flooded with an Natura IGS Agent
Agent Conc.
vol %
% O2at
Sea Level PO2, psi Allowed Occupancy Egress Time
Limit
C < 43 %O2> 12 PO2 > 1.78 Normally occupied 5 min
43 < C < 52 12 > %O2> 10 1.78 > PO2 > 1.47 Normally occupied 3 min
52 < C < 62 10 > %O2> 8 1.47 > PO2 > 1.18 Not normally occupied 30 s
C > 62 %O2< 8 PO2 < 1.18 Unoccupied areas only n/a

General Information
P/N 06-237620-001 1-5 June 2020
1-4.2 IG-100 (Nitrogen)
Natura IGS systems with IG-100 are fixed fire extinguishing systems that use the inert gas
Nitrogen, UN number 1066. The purity of the Nitrogen shall be as follows:
• Nitrogen greater than or equal to 99.7%.
• Oxygen less than or equal to 10 ppm.
• Water less than or equal to 10 ppm.
Note: Only principal contaminants are shown. Other measurements may include: Carbon
Monoxide, Carbon Dioxide, Nitrogen Oxide, and Nitrogen Dioxide most < 20 ppm.
Figure 1-1. IG-100 Pressure/Temperature Curve Isometric Diagram for 200 bar, U.S. Customary Units
Figure 1-2. IG-100 Pressure/Temperature Curve Isometric Diagram for 200 bar, SI Units

General Information
June 2020 1-6 P/N 06-237620-001
Figure 1-3. IG-100 Pressure/Temperature Curve Isometric Diagram for 300 bar, U.S. Customary Units
Figure 1-4. IG-100 Pressure/Temperature Curve Isometric Diagram for 300 bar, SI Units

General Information
P/N 06-237620-001 1-7 June 2020
1-4.3 IG541 (Nitrogen, Argon, and Carbon Dioxide)
Natura IGS systems with IG-541 are fixed fire extinguishing systems that use an inert gaseous
mixture of 52% Nitrogen, 40% Argon, and 8% Carbon Dioxide (IG-541), UN number 1956.
Specification for IG-541 is a Nitrogen/Argon/Carbon Dioxide 52%/40%/8% ratio by volume.
The tolerance of the mixture in air is as follows:
• Nitrogen: 52% +/- 4 %
• Argon: 40% +/- 4%
• Carbon Dioxide: 8% + 1%/ - 0%
1-4.3.1 Purity
Each element shall conform to the following purity specification:
Argon:
• Argon greater than or equal to 99.99%.
• Oxygen less than or equal to 10 ppm.
• Water less than or equal to 10 ppm.
Nitrogen:
• Nitrogen greater than or equal to 99.7%
• Oxygen less than or equal to 10 ppm.
• Water less than or equal to 10 ppm.
Carbon Dioxide:
• Carbon Dioxide greater than or equal to 99.7%
• Oxygen less than or equal to 10 ppm.
• Water less than or equal to 10 ppm.
Note: Only principal contaminants are shown. Other measurements may include: Carbon
Monoxide, Carbon Dioxide, Nitrogen Oxide, and Nitrogen Dioxide most < 20 ppm.
Figure 1-5. IG-541 Pressure/Temperature Curve Isometric Diagram for 200 bar, U.S. Customary Units

General Information
June 2020 1-8 P/N 06-237620-001
Figure 1-6. IG-541 Pressure/Temperature Curve Isometric Diagram for 200 bar, SI Units
Figure 1-7. IG-541 Pressure/Temperature Curve Isometric Diagram for 300 bar, U.S. Customary Units

General Information
P/N 06-237620-001 1-9 June 2020
Figure 1-8. IG-541 Pressure/Temperature Curve Isometric Diagram for 300 bar, SI Units

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June 2020 1-10 P/N 06-237620-001
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1-4.4 IG-55 (Nitrogen and Argon)
Natura IGS systems with IG-55 are fixed fire extinguishing systems that use an inert, gaseous
mixture of 50% Nitrogen and 50% Argon known as Argonite®, UN number of 1956.
Specification for IG-55 is an Argon/Nitrogen 50%/50% ratio by volume. Tolerance of mixture
in air is as follows:
• Argon: 50% +/- 5%
• Nitrogen: 50% +/- 5%
1-4.4.1 Purity of Argon and Nitrogen
Each element shall conform to the following purity specification:
Argon:
• Argon greater than or equal to 99.99%
• Oxygen less than or equal to 10 ppm
• Water less than or equal to 10 ppm
Nitrogen:
• Nitrogen greater than or equal to 99.7%
• Oxygen less than or equal to 10 ppm
• Water less than or equal to 10 ppm
Note: Only principal contaminants are shown. Other measurements may include: Carbon
Monoxide, Carbon Dioxide, Nitrogen Oxide, and Nitrogen Dioxide most < 20 ppm.
Figure 1-9. IG-55 Pressure/Temperature Curve Isometric Diagram for 200 bar, U.S. Customary Units

General Information
P/N 06-237620-001 1-11 June 2020
Figure 1-10. IG-55 Pressure/Temperature Curve Isometric Diagram for 200 bar, SI Units
Figure 1-11. IG-55 Pressure/Temperature Curve Isometric Diagram for 300 bar, U.S. Customary Units

General Information
June 2020 1-12 P/N 06-237620-001
Figure 1-12. IG-55 Pressure/Temperature Curve Isometric Diagram for 300 bar, SI Units