UNITED Nitrogen Pac SC-W Guide

M O D E L S C –W
INSTALLATION, COMMISSIONING,
AND MAINTENANCE MANUAL
SERIAL NUMBER: ___________________________________________________________
DATE OF INSTALLATION: ____________
DATE OF COMMISSIONING: ____________
UNITED Fire Systems
Division of UNITED Fire Protection Corporation
1 Mark Road
Kenilworth, NJ USA 07033
908-688-0300
Unitedfiresystems.com
Manual Part Number 30-NPWICM-000
Revision 1.01
Mar 2021

(THIS SURFACE DELIBERATELY LEFT BLANK)

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
i
INDEX
Section
Description
Page
INDEX
List Of Figures
iv
List Of Tables
v
List Of Abbreviations
vi
Safety Information
vii
Foreword
ix
1.
GENERAL INFORMATION
1
1.1
Glossary
1
1.2
System Purpose
2
1.3
Functional Description
3
1.4
Model SC-W Assembly –Internal Arrangement
5
1.5
Model SC-W Assembly –External Arrangement
7
1.5.1
Connections
7
1.5.2
Indicators
7
1.5.3
Controls
7
1.5.4
Other
7
1.6
Nitrogen Receiver –Model NR-5
9
1.7
Nitrogen Receiver –Model NR-10
10
1.8
Nitrogen / Air Maintenance Device –Model NAMD-1
11
1.9
Purge Vent Assemblies
12
1.9.1
Purge Vent Assembly –Model PVA-4 (For Manual Purging)
12
1.9.2
Purge Vent Assembly –Model PVA-2 (For TRUE ADVANCED PURGE (TAP) Device)
13
1.10
N2Purity Analyzer –Hand-Held –Model NA-2
14
1.11
(Optional) TRUE ADVANCED PURGE (TAP) Device –Model TAP-G3
15
1.12
(Optional) Corrosion Monitor Assembly –Model CMA-1
16
2.
EQUIPMENT SELECTION
17
2.1
Introduction
17
2.2
Basis for Equipment Selection
17
2.3
Steps to Follow
17
2.4
Information To Be Obtained During Survey
17
2.5
System Arrangements
19
2.5.1
Type IArrangement
19
2.5.2
Type II Arrangement
20
2.6
Ensuring the NITROGEN-PAC™ Model SC-W is Appropriate for the Sprinkler System in Use
21
2.6.1
Maximum Number Of Risers
21
2.6.2
Determining Volume (In Gallons) Of Each Sprinkler Riser
21
2.6.3
Maximum Volume Of Single Largest Riser
22
2.6.4
Maximum Volume Of All Risers
22
2.6.5
Required Supervisory Pressure
22
2.6.6
Type I Arrangements –Model SC-W Assembly for Initial-Fill with Air
22
2.6.7
Type II Arrangements –External Air Compressor for Initial-Fill with Air
22
2.6.8
Are Sprinkler Systems NEW or EXISTING?
22
2.6.9
Are Sprinkler Systems Equipped with Quick-Opening Devices (Dry Accelerators)?
23
2.6.10
Nitrogen Receiver
23
2.6.11
Nitrogen / Air Maintenance Device –Model NAMD-1
23

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
ii
2
EQUIPMENT SELECTION (continued)
2.6.12
Nitrogen Purging and Sensing
23
2.6.12 (a)
Purge Vent Assembly (Model PVA)
23
2.5.12 (b)
Hand-Held Nitrogen Purity Analyzer –Model NA-2
23
2.5.12 (c)
(Optional) TRUE ADVANCED PURGE (TAP) Device –Model TAP-G3
24
2.6.13
(Optional) Corrosion Monitor Assembly –Model CMA-1
24
2.7
Equipment Selection Examples
24
3.
INSTALLATION
30
3.1
General Installation Information
31
3.1.1
Unpacking
31
3.1.2
Equipment Locations
31
3.2
Model SC-W Assembly
31
3.2.1
Location
31
3.2.2
Mounting
32
3.2.3
N2Purity Analyzer Connection
34
3.2.4
Outlet Connection
35
3.2.5
Drain Connection
36
3.2.6
Electrical Connections
36
3.2.6.1
General
36
3.2.6.2
Using Top Entry Raceway Attachment Point
37
3.2.6.3
Using Left-Side Raceway Attachment Point
39
3.3
Piping Requirements
40
3.4
Model NR-5 Nitrogen Receiver
41
3.4.1
Wall Mounting With or Without Strut Channel
42
3.4.2
Riser Mounting
43
3.4.3
Inlet, Outlet, and Drain Connections
44
3.5
Model NR-10 Nitrogen Receiver
45
3.5.1
Mounting –Floor-Mount
45
3.5.2
Inlet, Outlet, and Drain Connections
46
3.6
Nitrogen / Air Maintenance Device –Model NAMD-1
47
3.7
Purge Vent Assembly –Model PVA
47
3.7.1
Choice of Model PVA To Use
47
3.7.2
Location
47
3.7.3
Connection to Vertical Piping
47
3.7.4
Connection to Horizontal Piping
48
3.8
N2Purity Analyzer –Hand-Held Model NA-2
49
3.9
(Optional) TRUE ADVANCED PURGE (TAP) Device Model TAP-G3
49
3.10
(Optional) Corrosion Monitor Assembly Model CMA-1
50
3.10.1
Attachment To Sprinkler Piping
50
3.10.2
Vertical Installation
50
3.10.3
Horizontal Installation
50
3.10.4
Electrical Connection
52
4.
COMMISSIONING
53
4.1
Preliminary
57
4.2
Startup
58
4.3.1
30 Minute Initial Fill (Type I System)
58
4.3.2
30 Minute Initial Fill (Type II System)
58
4.4
Purging
59
4.5
Final Acceptance
60

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
iii
5.
MAINTENANCE
62
5.1
Monthly Inspection
64
5.1.1
Objective
64
5.1.2
Personnel
64
5.1.3
Instructions
64
5.2
Specific Procedures –Monthly Inspection
64
5.2.1
Use of Model NA-2 N2Purity Analyzer to Measure Nitrogen Purity at Model SC-W Assembly
64
5.2.2
Inspection of Enclosure Inlet Filter Element –Model SC-W Assembly
64
5.2.3
Inspection of Exhaust Fan Filter Element –Model SC-W Assembly
64
5.2.4
Use of Model NA-2 N2Purity Analyzer to Measure Nitrogen Purity at Model PVA-2
64
5.3
Annual Maintenance
65
5.3.1
Objective
65
5.3.2
Personnel
65
5.3.3
Instructions
65
5.4
Specific Procedures –Annual Maintenance
65
5.4.1
Replacement of Compressor Intake Filter –Model SC-W Assembly
65
5.4.2
Replacement of Enclosure Inlet Filter Element –Model SC-W Assembly
65
5.4.3
Replacement of Exhaust Fan Filter –Model SC-W Assembly
65
5.4.4
Replacement of Filter Elements –Model SC-W Assembly
66
5.4.5
Drainage of Accumulated Water at Model PVA Purge Vent Assembly
67
5.4.6
Replacement of Strainer at Model PVA Purge Vent Assembly
67
5.5
Maintenance Parts
67
6.
TROUBLESHOOTING
68
APPENDICES
A
N2Purity Analyzer –Hand-Held Model NA-2
B
Installation –Model NAMD-1 Nitrogen / Air Maintenance Device (UFS-710)
C
Checklist –Commissioning –Model SC-W System (UFS-622)
D
Checklist –Monthly Inspection –Model SC-W System (UFS-623)
E
Checklist –Annual Maintenance –Model SC-W System (UFS-624)
F
Coalescing and Particulate Filters
G
Water Separator
H
Limited Warranty –NITROGEN-PAC™ Model SC Systems
J
Limited Warranty –TRUE ADVANCED PURGE™ Model TAP-G3 Device
K
Limited Warranty –SPRINKLER ACCESSORIES Model NAMD-1 Device

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
iv
LIST OF FIGURES
Figure
No.
Description
Page
SECTION 1 –GENERAL INFORMATION
1
Functional Description and General Arrangement
4
2
Model SC-W Assembly –Internal Arrangement
6
3
Model SC-W Assembly –External Arrangement
8
4
Nitrogen Receiver –Model NR-5
9
5
Nitrogen Receiver –Model NR-10
10
6
Nitrogen / Air Maintenance Device –Model NAMD-1
11
7
Purge Vent Assembly, Manual –Model PVA-4
12
8
Purge Vent Assembly (For TRUE ADVANCED PURGE Device) –Model PVA-2
13
9
N2Purity Analyzer, Hand-Held –Model NA-2
14
10
TRUE ADVANCED PURGE (TAP) Device –Model TAP-G3
15
11
Corrosion Monitor Assembly –Model CMA-1
16
SECTION 2 –EQUIPMENT SELECTION
12
Type IModel SC-W System Arrangement
19
13
Type II Model SC-W System Arrangement
20
14
Model SC-W with Model NR-5 Wall-Mount
27
15
Model SC-W with Model NR-5 Riser-Mount
28
16
Model SC-W with Model NR-10 Floor-Mount
29
SECTION 3 –INSTALLATION
17
Dimensions –Model SC-W Assembly
32
18
Strut Channel Mounting –Model SC-W Assembly
33
19
N2 Purity Analyzer Connection –Model SC-W Assembly
34
20
Outlet Connection –Model SC-W Assembly
35
21
Using Top Entry Raceway Attachment Point –Model SC-W Assembly
38
22
Using Left-Side Raceway Attachment Point –Model SC-W Assembly
39
23
Dimensions –Model NR-5 Nitrogen Receiver
41
24
Wall-Mounting with Strut Channel –Model NR-5 Nitrogen Receiver
42
25
Riser-Mounting –Model NR-5 Nitrogen Receiver
43
26
Connections –Model NR-5 Nitrogen Receiver
44
27
Dimensions –Model NR-10 Nitrogen Receiver
45
28
Mounting –Model NR-10 Nitrogen Receiver
45
29
Connections –Model NR-10 Nitrogen Receiver
46
30
Purge Vent Assembly Model PVA –Dimensions and Installation in Vertical Piping
48
31
Purge Vent Assembly Model PVA –Installation in Horizontal Piping
49
32
Installation –Corrosion Monitor Assembly Model CMA-1
51
33
Electrical Connection –Corrosion Monitor Assembly Model CMA-1
52
SECTION 4 - COMMISSIONING
34
Model SC-W Assembly –Valve Locations and Numbers
54
35
Bypass Valve and Indicator Operation
55
36
Model SC-W Assembly –External Indicators and Controls
56
37
Packaging Material –Air Compressor
57
SECTION 5 - MAINTENANCE
38
Model SC-W Assembly Components
63
39
Model PVA Purge Vent Assembly (Model PVA-2 Shown)
66

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
v
LIST OF TABLES
Table
No.
Description
Page
SECTION 2 –EQUIPMENT SELECTION
1
Information To Be Obtained During Survey
17
2
Maximum Limits - NITROGEN-PAC™ Model SC-W Assembly
21
3
Gallons Per Foot Of Pipe Based On Nominal Pipe Size And Pipe Schedule
22
4
Purge Vent Assemblies
23
5
Equipment Selection Examples
24
SECTION 3 - INSTALLATION
6
Minimum Wire Size for Model SC-W Assembly 120 VAC Power
37
7
Piping Limitations
40
8
PVAs for Use with Model SC-W Systems
47
SECTION 4 - COMMISSIONING
9
Valve Numbers and Purposes
54
10
Example –Setting of Model NAMD-1 Connected to External Air Compressor (Type II System)
59
11
Quick Reference Valve Position Table
61
SECTION 5 - MAINTENANCE
12
Maintenance Parts
67

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
vi
LIST OF ABBREVIATIONS
The following is an explanation of abbreviations used in this manual.
MEASUREMENT UNITS
ABBREVIATION
UNIT
PARAMETER BEING MEASURED
A
Amperes
Electric current
°F
Degrees Fahrenheit
Temperature
Hz
Hertz
Frequency (cycles per second)
in
Inches
Length
lbs.
Pounds
Weight
PSI
Pounds per Square Inch
Pressure (reference not specified)
PSIG
Pounds per Square Inch, Gauge
Pressure (referenced to normal atmospheric
pressure)
VAC
Volts, Alternating Current
Electrical voltage (electromotive force)
v/v
Volume / Volume
Concentration expressed as a ratio of volumes
OTHER MEASUREMENT TERMS
ABBREVIATION
MEANING
H
Height
L
Length
W
Width
NITROGEN-PAC™ EQUIPMENT
ABBREVIATION
MEANING
NAMD
Nitrogen / Air Maintenance Device
NA
Nitrogen Analyzer
PVA
Purge Vent Assembly
SC-W
“Self-Contained Wall-mount” (refers to self-contained, wall-mounted NITROGEN-PAC™Model
SC-W assemblies)
TAP
True Advanced Purge device
MISCELLANEOUS TERMS
ABBREVIATION
MEANING
MIC
Microbiologically Influenced Corrosion
N2
Nitrogen (2 represents two atoms of nitrogen in a naturally-occurring diatomic molecule)
NFPA
National Fire Protection Association
NPT
National Pipe Thread - Tapered
Sch.
Schedule (refers to standard expression of pipe wall thickness)

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
vii
SAFETY INFORMATION
This manual contains safety information that is important to know and understand. This information is provided for the
safety of installers, operators, and users of the UNITED Fire Systems NITROGEN-PAC™ equipment. Carefully read,
understand, and follow instructions identified by these symbols.
DANGER
RISK OF ELECTROCUTION
The use of the words “DANGER” and “RISK OF ELECTROCUTION” with the lightning symbol identifies an
immediate electrical hazard with a likelihood of death or serious personal injury if instructions, including
recommended precautions, are NOT followed.
DANGER
The use of the word “DANGER” identifies an immediate hazard with a likelihood of death or serious personal injury if
instructions, including recommended precautions, are not followed.
WARNING
The use of the word “WARNING” identifies the presence of hazards or unsafe practices that could result in death,
personal injury, or serious property damage if instructions, including recommended precautions, are not followed.
CAUTION
The use of the word “CAUTION” identifies possible hazards or unsafe practices that could result in personal injury or
property damage if instructions, including recommended precautions, are not followed.
IMPORTANT
The use of the word “IMPORTANT” identifies special instructions, not related to hazards that should be followed.

UNITED FIRE SYSTEMS - NITROGEN-PAC™ MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
viii
IMPORTANT NOTICES TO INSTALLERS AND USERS
This manual must be read thoroughly and completely understood before installation and operation of UNITED Fire
Systems NITROGEN-PAC™ equipment. All appropriate safety standards for handling of gases as determined by local or
national laws and regulations should be followed at all times.
WARNING
Do not operate assembly if damage occurred during shipping, handling, or use. Contact UNITED Fire Systems
immediately. Failure to do so could result in death, personal injury, or serious property damage.
General Safety Information
IMPORTANT
Read all of the safety information in this manual before operating this equipment. Use of the equipment in a manner not
specified within this manual may impair the protection provided by the equipment and could result in an unplanned
release of pressure, which may cause serious injury or damage. Only competent personnel, who have been trained,
qualified, and approved by UNITED Fire Systems should perform commissioning, servicing, and repair procedures.
When handling, installing, or operating this equipment, personnel must employ safe engineering practices and observe all
related local regulations, health, and safety procedures, and legal requirements for safety.
Ensure that the equipment is depressurized and electrically isolated before carrying out any of the scheduled
maintenance instructions specified in this manual.
Nitrogen is not a poisonous gas. However, in a concentrated form, there is a risk of asphyxiation. The Model SC-W
assembly produces both a flow of nitrogen and a flow of oxygen enriched air which quickly disperses in the atmosphere.
However, do not directly inhale the output gas from the outlet pipe.
NITROGEN-PAC™ Model SC-W equipment is classified as non-hazardous for transportation purposes and as non-
flammable for fire regulations. This equipment is for indoor use only. Do not operate outdoors.
Specific procedures must be followed for maintenance of the NITROGEN-PAC™ Model SC-W system and the equipment
to which the assembly is connected. Appropriate labels must be continuously displayed in all areas where personnel
might be exposed to a nitrogen atmosphere.