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UNITED Nitrogen Pac SC-W, Installation, Commissioning Maintenance

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UNITED FIRE SYSTEMS 

NITROGEN-

PAC™

 MODEL SC-W 

INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL 

REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000 

 

35 

3.2.4. Outlet Connection.  

Refer to

 Figure 20. 

 
 

Figure 20 

Outlet Connection 

 
 
 

                                  

 

 
 
 

 

 

 
 
 
 
 
 
 
 
(a)

 Remove and discard plastic plug from Model SC-W assembly outlet port. 

 

(b)

 Attach outlet valve assembly to Model SC-W assembly outlet port.  Tighten securely, but do not overtighten. 

 

(c)

 Orient outlet valve assembly with outlet fitting pointed downward. 

 

(d)

 Retain the outlet hose for attachment of nitrogen piping to outlet. 

 
 
 

 

IMPORTANT

 

DO NOT omit the provided outlet hose.  The hose minimizes compressor motor vibration from reaching the nitrogen 

piping. 

 

 
 

 

 

SEE (a) BELOW 

 

SEE (b) BELOW 

 

SEE (c) BELOW 

 

SEE (d) BELOW 

 

Summary of Contents for Nitrogen Pac SC-W

Page 1: ..._______________________________________ 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 ...

Page 2: ... THIS SURFACE DELIBERATELY LEFT BLANK ...

Page 3: ...odel 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 I Arrangement 19 2 5 2 Type II Arrangement 20 2 6 Ensuring the NITROGEN PAC Mod...

Page 4: ...ng 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 Ve...

Page 5: ...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...

Page 6: ...trut 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 Rise...

Page 7: ...ons 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 Com...

Page 8: ...olts 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 NITROG...

Page 9: ...erious 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 person...

Page 10: ...en 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...

Page 11: ...vital part of the fire protection of any facility where these units are installed Life safety and property protection depends on continuing proper operation of these assemblies The owner of the Model SC W equipment is responsible for its condition and continued proper operation UNITED Fire Systems strongly recommends that all owners of Model SC W systems engage the services of qualified trained fi...

Page 12: ...ence of oxygen or anaerobic not needing oxygen but growing in the presence of water Prevention of MIC results in longer life and better functionality of the sprinkler system MIC can be inhibited by using nitrogen to displace oxygen and dry out the inside of the pipe Nitrogen N2 Nitrogen is a naturally occurring diatomic gas present in Earth s atmosphere at a concentration of approximately 78 v v A...

Page 13: ...f two distinct types Oxidation corrosion takes place in the presence of oxygen and is accelerated by the presence of water Microbiologically influenced corrosion MIC takes place in the presence of certain microbes that attack metal again in the presence of water and in many cases oxygen Reducing the damaging effects of corrosion is best accomplished by greatly reducing or eliminating the amount of...

Page 14: ...and nitrogen pressure is properly regulated and delivered to the sprinkler valve by this device Preaction or Dry Pipe Sprinkler Valve The trim of the sprinkler valve receives the gas pressure from the nitrogen air maintenance device Sprinkler Piping The interior of the sprinkler piping is protected against oxidation corrosion and MIC by the 98 purity N2 generated by the NITROGEN PAC Model SC W ass...

Page 15: ...21 P N 30 NPWICM 000 4 Figure 1 Functional Description and General Arrangement MODEL SC W ASSEMBLY OUTLET HOSE NITROGEN RECEIVER MODEL NR 5 PRESSURE MAINTENANCE DEVICE MODEL NAMD 1 PREACTION OR DRY PIPE SPRINKLER VALVE SPRINKLER PIPING TRUE ADVANCED PURGE MODEL TAP G3 FLEXIBLE TUBING PURGE VENT ASSEMBLY MODEL PVA 2 ...

Page 16: ...m contamination refer to Section 5 Maintenance Coalescing Filter The coalescing filter consists of a rugged cast aluminum housing and a filter element with a stainless steel support core and high performance filter media The coalescing filter separates oil from the dried compressed air stream with the air flowing from the inside of the element to the outside Periodic replacement of the filter elem...

Page 17: ...e nitrogen separator membrane Electrical Connection Enclosure The 115 VAC power connection is made inside the electrical connection enclosure Drain Connection Water removed from the compressed air exits at the drain connection Figure 2 Model SC W Assembly Internal Arrangement ELECTRICAL ENCLOSURE BYPASS VALVE PARTICULATE FILTER NEEDLE VALVE OUTLET VALVE PRESSURE REGULATOR AIR COMPRESSOR COOLING FA...

Page 18: ...gure 3 is in the ON position Bypass Visual Indicator This indicator flashes RED to indicate that the Model SC W assembly is in BYPASS mode capable of delivering compressed air to the sprinkler system for 30 minute initial fill Compressor Runtime Monitor This is a digital display that monitors the total hours and minutes that the compressor motor has run This information can be used to evaluate the...

Page 19: ...igure 3 Model SC W Assembly External Arrangement BYPASS VISUAL INDICATOR MOUNTING TABS ALTERNATE POWER CONNECTION POINT ENCLOSURE VENT DRAIN CONNECTION POWER CONNECTION POINT POWER ON VISUAL INDICATOR ON OFF SWITCH RUNTIME MONITOR PRESSURE GAUGES N2 PURITY ANALYZER CONNECTION POINT OUTLET BALL VALVE OUTLET CONNECTION POINT ENCLOSURE VENT ...

Page 20: ...voir of nitrogen for the sprinkler system The nitrogen receiver is designed to be mounted vertically on the wall near the Model SC W assembly near the sprinkler system valve s or on a sprinkler riser The tank is manufactured to ASME Section VIII Division I The device includes an inlet fitting at the top an outlet fitting on the side and a manual drain valve at the bottom Integral brackets permit e...

Page 21: ...essor runtime by providing a reservoir of nitrogen for the sprinkler system The nitrogen receiver is designed to be floor mounted when wall or riser mount of a nitrogen receiver is not practical The tank is manufactured to ASME Section VIII Division I The device includes an inlet fitting at the top an outlet fitting on the side and a manual drain valve at the bottom The device is required to be mo...

Page 22: ...ator capable of providing accurate regulation over a wide range of inlet pressures and gas flows Upon activation of a sprinkler head the gas pressure will not interfere with the operation of the sprinkler valve or unduly lengthen the time for the sprinkler piping to fill with water Manual ball valves allow the device to be bypassed for initial fill of the piping with air A strainer protects the re...

Page 23: ...elps prevent blockage of the orifice by debris A drain plug allows occasional removal of accumulated liquid water A minimum of one 1 purge vent assembly PVA is required for each sprinkler riser to be filled with nitrogen 1 9 1 Purge Vent Assembly Model PVA 4 For Manual Purging Refer to Figure 7 The Model PVA 4 Purge Vent Assembly serves as a connection point for a Model NA 2 N2 Purity Analyzer Han...

Page 24: ...PURGE Device Refer to Figure 8 The Model PVA 2 Purge Vent Assembly serves as the connection point for flexible tubing that directs gas from the inside of the sprinkler pipe to a UNITED Fire Systems TRUE ADVANCED PURGE TAP device refer to 1 11 Figure 8 Purge Vent Assembly Model PVA 2 For TRUE ADVANCED PURGE Device INLET BALL VALVE UNION STRAINER FLOAT VALVE SAMPLING TUBING ATTACHMENT DRAIN PLUG ...

Page 25: ...urge vent assembly provides assurance that 98 N2 purity is present in the sprinkler piping The analyzer is hand held battery operated and contains a large 3 digit display directly reading the N2 purity in percent The analyzer is equipped with a length of flexible tubing with a male quick connect fitting that is compatible with the female quick connect fittings on the Model SC W assembly and the Mo...

Page 26: ...cted N2 purity analyzer for the sprinkler piping avoiding the need for manual verification of N2 purity in the piping Use the Model PVA 2 Purge Vent Assembly with the Model TAP G3 device The device is shipped with twenty 20 feet of plenum rated flexible connection tubing UFS P N 33 000003 020 Refer to UFS P N 33 TG3USE 000 User Guide and UFS P N 33 TG3ICM 000 Installation Commissioning and Mainten...

Page 27: ...e and a drain valve The corrosion probe when intact keeps pressure from reaching the pressure switch When corrosion perforates the probe pressure reaches the pressure switch actuating a volt free contact providing an early warning signal of possible corrosion occurring inside the piping The isolation valve permits replacement of the corrosion probe without depressurizing the entire system and the ...

Page 28: ...ms and the industry standard target of 98 minimum purity nitrogen in each sprinkler system 2 3 Steps to Follow a Read understand and follow the instructions in this manual b Perform a survey of the sprinkler system s to be supplied with nitrogen c Use survey information to determine if the Model SC W is the proper nitrogen generator assembly s to be supplied and all other components needed for a c...

Page 29: ... purging is important To avoid inadvertent sprinkler valve tripping consider replacing the dry accelerator with a new device or close the inlet valve to the dry accelerator during purging NOTE Closing the dry accelerator inlet valve may result in lengthened time for water to reach the most remote sprinkler head s Ensure that the Authorities Having Jurisdiction and the owner are in agreement regard...

Page 30: ...fill as required by NFPA 13 and have no additional external compressor Type I arrangements can be used for single riser or two riser systems Figure 12 Type I Model SC W System Arrangement Shown With Model NR 5 Wall Mount Nitrogen Receiver IMPORTANT Type I arrangements are NOT RECOMMENDED for use with dry pipe sprinkler systems Use Type I arrangements for preaction sprinkler systems only Further in...

Page 31: ...lied check valves shall be used to separate the Model SC W assembly pressure source from the additional air compressor pressure source Check valves should be brass rated for minimum 500 PSIG at 70 F have a minimum opening pressure of 1 PSIG and be spring loaded to permit mounting in any configuration An acceptable check valve is McMaster Carr 7768K14 1 2 NPT female x female or McMaster Carr 7768K4...

Page 32: ...mblies or another choice of NITROGEN PAC system from UNITED Fire Systems 2 6 2 Determining Volume In Gallons of Each Sprinkler Riser Determining the actual volume in gallons of each sprinkler riser is necessary to ensure that the Model SC W assembly is appropriate for the installation being considered IMPORTANT The pipe volume is a fundamental parameter that MUST be determined If a relatively inac...

Page 33: ...g air compressor the maximum volume of the single largest riser is 900 gallons 2 6 4 Maximum Volume of All Risers When the volume of each riser has been determined add these values together to determine the volume of all risers The maximum volume of all risers is 900 gallons 2 6 5 Required Supervisory Pressure Different types of sprinkler valves require different values of supervisory pressure exp...

Page 34: ... is capable of handling the additional weight Select the Model NR 5 Nitrogen Receiver c The nitrogen receiver can be floor mounted if wall mounting and riser mounting are impractical Select the Model NR 10 Nitrogen Receiver 2 6 11 Nitrogen Air Maintenance Device Model NAMD 1 If existing sprinkler systems have air maintenance devices already installed such devices may be re used It is recommended t...

Page 35: ... to provide a signal when internal corrosion has occurred inside the sprinkler pipe 2 7 Equipment Selection Examples The following examples illustrate the use of the information provided Table 5 Equipment Selection Examples Example Number No Of Risers Supervisory Pressure PSI Largest Riser Vol gal Total Riser Vol gal Initial Fill Compressor System Type 2 7 1 1 40 200 200 SC W Type I 2 7 2 2 20 500...

Page 36: ...t is the volume of Riser 2 in gallons 400 What is the volume of the SINGLE LARGEST riser in gallons 500 What is the volume of ALL risers in gallons 900 What is the supervisory pressure in PSIG 20 Is the Model SC W required to provide initial fill with air YES UFS Model Number Description Qty Notes SC W 115 1 NITROGEN PAC TM Model SC W Assembly 1 Includes Model NA 2 N2 Purity Analyzer Hand Held NR ...

Page 37: ... in gallons 300 What is the volume of the SINGLE LARGEST riser in gallons 600 What is the volume of ALL risers in gallons 900 What is the supervisory pressure in PSIG 40 Is the Model SC W required to provide initial fill with air NO UFS Model Number Description Qty Notes SC W 115 1 NITROGEN PAC TM Model SC W Assembly 1 Includes Model NA 2 N2 Purity Analyzer Hand Held NR 5 Nitrogen Receiver 5 Gallo...

Page 38: ...ON 1 01 MAR 2021 P N 30 NPWICM 000 27 Figure 14 Model SC W with Model NR 5 Wall Mount 1 OR 2 SPRINKLER RISERS MODEL NAMD 1 PRESSURE MAINTENANCE DEVICE S MODEL NAMD 1 PRESSURE MAINTENANCE DEVICE EXTERNAL AIR COMPRESSOR MODEL SC W NITROGEN GENERATOR WALL MOUNTED MODEL NR 5 NITROGEN RECEIVER CHECK VALVES ...

Page 39: ...N 1 01 MAR 2021 P N 30 NPWICM 000 28 Figure 15 Model SC W with Model NR 5 Riser Mount RISER MOUNTED MODEL NR 5 NITROGEN RECEIVER MODEL NAMD 1 PRESSURE MAINTENANCE DEVICE S CHECK VALVES 1 OR 2 SPRINKLER RISERS MODEL NAMD 1 PRESSURE MAINTENANCE DEVICE EXTERNAL AIR COMPRESSOR MODEL SC W NITROGEN GENERATOR ...

Page 40: ... 1 01 MAR 2021 P N 30 NPWICM 000 29 Figure 16 Model SC W with Model NR 10 Floor Mount MODEL SC W NITROGEN GENERATOR CHECK VALVES MODEL NAMD 1 PRESSURE MAINTENANCE DEVICE S 1 OR 2 SPRINKLER RISERS MODEL NAMD 1 PRESSURE MAINTENANCE DEVICE EXTERNAL AIR COMPRESSOR FLOOR MOUNTED MODEL NR 10 NITROGEN RECEIVER ...

Page 41: ...rea where and oxygen enriched atmosphere will be a hazard Failure to comply with this warning can result in increased risk from fire including death serious personal injury and property damage CAUTION Understand and follow all safety recommendations when moving heavy pieces of equipment Equipment may be easily tipped over when moving Failure to use caution can result in equipment damage and person...

Page 42: ...ght as shown in Figure 17 DO NOT orient the Model SC W assembly tilted in any plane c Weight The Model SC W assembly weighs approximately 180 lbs shipping weight 200 lbs Ensure that the mounting surface is capable of supporting the weight with a clear safety margin Consult a structural engineer as necessary to verify suitability of location d Noise The Model SC W assembly emits noise when the comp...

Page 43: ...without strut channel Strut channel is highly recommended for mounting on sheetrock or similar surfaces to permit secure attachment to wall studs Refer to Figure 17 for mounting tab hole and other dimensions Refer to Figure 18 for an illustration of strut channel mounting Figure 17 Dimensions Model SC W Assembly NOTES Mounting Tab hole diameter 0 44 Depth is approximately 9 5 with door closed 24 4...

Page 44: ...ENANCE MANUAL REVISION 1 01 MAR 2021 P N 30 NPWICM 000 33 Figure 18 Strut Channel Mounting Model SC W Assembly NOTES Mounting Tab hole diameter 0 44 Depth is approximately 9 5 with door closed not including strut depth Strut channel by installer 44 STRUT CHANNEL 26 MIN recommended ...

Page 45: ...r Connection Refer to Figure 19 Figure 19 N2 Purity Analyzer Connection a Remove and discard plastic plug from Model SC W assembly N2 purity analyzer connection port b Attach N2 purity analyzer connection assembly to port Tighten securely but do not overtighten c Orient assembly with quick disconnect fitting pointed downward SEE a BELOW SEE b BELOW SEE c BELOW ...

Page 46: ...Model SC W assembly outlet port b Attach outlet valve assembly to Model SC W assembly outlet port Tighten securely but do not overtighten c Orient outlet valve assembly with outlet fitting pointed downward d Retain the outlet hose for attachment of nitrogen piping to outlet IMPORTANT DO NOT omit the provided outlet hose The hose minimizes compressor motor vibration from reaching the nitrogen pipin...

Page 47: ...ing drain or an environmentally approved condensate collection disposal system c Oil Water Separator Installer provided option If run to a building drain environmental regulations may require installation of an oil water separator 3 2 6 Electrical Connections DANGER RISK OF ELECTROCUTION Voltages and currents associated with the Model SC W assembly are LETHAL Follow all instructions provided Work ...

Page 48: ...feet 12 gauge minimum Over 25 feet up to 50 feet 10 gauge minimum Over 50 feet up to 100 feet 8 gauge minimum NOTE Terminal block in Model SC W electrical enclosure accepts maximum 10 gauge wire Use a SHORT piece of 10 gauge wire as a pigtail attached to the 8 gauge wire with a mechanical connection device such as a wire nut WITHIN the Model SC W electrical enclosure Over 100 feet Use latest editi...

Page 49: ...corner of assembly Use care to avoid damage to contents of electrical enclosure c Attach approved raceway and fitting to knockout d Pull three 3 conductors HOT NEUTRAL GROUND through raceway into electrical enclosure e Refer to Figure 21 Connect three 3 conductors to terminal strip in electrical enclosure DO NOT disturb conductors or jumpers connected to other terminals GROUND NEUTRAL HOT ELECTRIC...

Page 50: ...out from left side of assembly c Mount a junction box on exterior of Model SC W assembly with one of the knockouts aligned with the knockout on the left side of the assembly d Attach approved raceway and conduit connectors to left side knockout and knockout on right side of electrical enclosure inside of Model SC W assembly e Pull three 3 conductors HOT NEUTRAL GROUND through junction box and race...

Page 51: ...ing Limitations SINGLE RISER SYSTEM CHOOSE ONE OPTION Pipe Size NPS Maximum Length All Pipe feet OPTION 1 Supply Pipe from Model SC W to sprinkler valve 1 2 inch 300 OPTION 2 Supply Pipe from Model SC W to sprinkler valve 3 4 inch 600 TWO RISER SYSTEM CHOOSE ONE OPTION Pipe Size NPS Maximum Length All Pipe feet OPTION 1 Supply Pipe from Model SC W to Branch Pipes 1 2 inch 300 Branch Pipes from Sup...

Page 52: ...iver may be mounted on a wall or on the sprinkler riser The device must be mounted vertically with the inlet at the top and the drain valve at the bottom to facilitate drainage Figure 23 Dimensions Model NR 5 Nitrogen Receiver 12 6 5 TOP VIEW 10 SIDE VIEW NOTES 1 Dimensions in RED indicate distance between mounting hole center lines 2 Mounting holes are 0 43 diameter 4 places 21 5 14 25 FRONT VIEW...

Page 53: ...el It is recommended that strut channel be used on sheetrock surfaces to spread the load and ensure that mounting hardware is inserted into wall studs Refer to Figure 23 for mounting dimensions and Figure 24 for use of strut channel Figure 24 Wall Mounting Model NR 5 Nitrogen Receiver NOTES Minimum recommended strut channel length 8 5 Strut channel should be long enough to permit mounting hardware...

Page 54: ... Model NR 5 Nitrogen Receiver may be mounted directly on the sprinkler riser Figure 25 Riser Mounting Model NR 5 Nitrogen Receiver NOTES Minimum recommended strut channel length 8 5 Strut channel should be long enough to accommodate pipe clamps Pipe clamps should be chosen to fully support the weight of the Model NR 5 assembly Mounting hardware provided by Installer PIPE CLAMPS x2 ...

Page 55: ...ve the 1 2 NPT male end of the outlet hose or 1 2 pipe may be used to connect the 1 2 NPT male end of the outlet hose to the inlet b The outlet should receive 1 2 NPT pipe to connect to the inlet of the Model NAMD 1 Nitrogen Air Maintenance Device s c The drain may be left unconnected or tubing may be run to an approved drain If the Model NR 5 Nitrogen Receiver is riser mounted tubing may be run f...

Page 56: ...t be mounted vertically with the inlet at the top and the drain valve at the bottom to facilitate drainage Figure 27 Dimensions Model NR 10 Nitrogen Receiver 3 5 1 Mounting Floor Mount Refer to Figure 28 Locate Model NR 10 Nitrogen Receiver in location to be mounted Securely fasten device to floor using suitable bolts or studs nuts through the mounting slots Figure 28 Mounting Model NR 10 Nitrogen...

Page 57: ...le end of the outlet hose or 1 2 pipe may be used to connect the 1 2 NPT male end of the outlet hose to the inlet b The outlet should receive 1 2 NPT pipe to connect to the inlet of the Model NAMD 1 Nitrogen Air Maintenance Device s c The drain may be left unconnected or tubing may be run to an approved drain Figure 29 Connections Model NR 10 Nitrogen Receiver INLET 1 2 NPT FEMALE OUTLET 1 2 NPT F...

Page 58: ...0 Quick Connect Female Model NA 2 Nitrogen Purity Analyzer Hand Held 3 7 2 Location The chosen Purge Vent Assembly should be located a At the end point of the most remote branch line b As high as possible to prevent water from being trapped at the device c As far away from the sprinkler valve as possible to facilitate purging of the entire piping network d At a location where the sprinkler pipe is...

Page 59: ...rm that the sprinkler piping is NOT pressurized could result in personal injury and or property damage a Install tee and nipple in horizontal piping Position the tee with the outlet vertical as indicated b Attach Purge Vent Assembly to nipple It is acceptable to install additional pipe and elbows before the assembly to accommodate proper installation The assembly MUST be installed vertically as sh...

Page 60: ...truction manual 3 9 Optional TRUE ADVANCED PURGE Assembly Model TAP G3 The TRUE ADVANCED PURGE Model TAP G3 may be installed to automatically purge air from within a dry pipe or preaction sprinkler system and replace the air with 98 nitrogen from a NITROGEN PAC sprinkler corrosion inhibiting system a Refer to Table 4 in section 2 6 12 for selecting a compatible Purge Vent Assembly Model PVA b For ...

Page 61: ...as shown Position the tee with the outlet vertical as indicated Attach Corrosion Monitor Assembly to nipple It is acceptable to install additional pipe and elbows before the assembly to accommodate proper installation The assembly MUST be installed as shown for drain valve to function properly Use union to facilitate installation and proper assembly positioning Isolation ball valve should remain c...

Page 62: ...UNITED FIRE SYSTEMS NITROGEN PAC MODEL SC W INSTALLATION COMMISSIONING AND MAINTENANCE MANUAL REVISION 1 01 MAR 2021 P N 30 NPWICM 000 51 Figure 32 Installation Corrosion Monitor Assembly Model CMA 1 ...

Page 63: ...3 Electrical Connection Corrosion Monitor Assembly Model CMA 1 a Remove cover by removing tamper resistant screw b Run wires through an approved raceway and conduit connector and affix the connector on the device Two knockouts are provided on the pressure switch for conduit Individual switch compartments and ground screws are suitable for dissimilar voltage c Connect wires to the appropriate termi...

Page 64: ...serious personal injury IMPORTANT Prior to commissioning the Model SC W nitrogen generating system the owner sprinkler contractor or other sprinkler service professional shall inspect and test the sprinkler piping to establish that maximum leakage is within the allowable limit set by NFPA Standard 13 THIS LEAKAGE RATE IS MAXIMUM 1 1 2 PSIG LOSS IN 24 HOURS STARTING AT 40 PSIG If excessive leakage ...

Page 65: ...ook for and identify all valves before proceeding Temperature fluctuations can affect nitrogen purity readings The temperature at the Model SC W assembly s location and at the system PVAs should be as stable as possible to provide maximum assurance of nitrogen purity measurement accuracy Use a copy of the Commissioning Worksheet Checklist Form UFS 622 Appendix C during the procedure to record all ...

Page 66: ...ION 1 01 MAR 2021 P N 30 NPWICM 000 55 Figure 35 Bypass Valve and Indicator Operation NORMAL CONDITION SUPPLYING NITROGEN BYPASSED CONDITION SUPPLYING AIR BYPASS VISUAL INDICATOR OFF VALVE 1 BYPASS VALVE HANDLE FACING UP BYPASS VISUAL INDICATOR ON FLASHING RED VALVE 1 BYPASS VALVE HANDLE FACING LEFT ...

Page 67: ...ROGEN PAC MODEL SC W INSTALLATION COMMISSIONING AND MAINTENANCE MANUAL REVISION 1 01 MAR 2021 P N 30 NPWICM 000 56 Figure 36 External Indicators and Controls POWER SWITCH BYPASS VISUAL INDICATOR SYSTEM POWER VISUAL INDICATOR ...

Page 68: ...ial from behind air compressor Preliminary 3 Verify that electrical connection to Model SC W assembly is complete in accordance with this manual Preliminary 4 Verify that all piping connections are complete in accordance with this manual Preliminary 5 Turn off water supply to sprinkler valve Preliminary 6 Ensure that valves in Table 9 are in the NORMAL position all PVA valves are CLOSED and all NA...

Page 69: ...ial Fill 4 CLOSE Model NAMD 1 Inlet Valve and OPEN NAMD 1 Bypass Valve Initial Fill 5 After 30 minutes or less required valve supervisory pressure should be reached CLOSE NAMD 1 Bypass Valve as soon as possible to avoid overpressurizing Low air supervisory switch should be satisfied Signal indicating low pressure should not be present when control unit is reset If supervisory pressure is NOT reach...

Page 70: ...O 4 4 PURGING Table 10 Example Setting of Model NAMD 1 Connected to External Air Compressor Type II System Parameter Setting Notes Recommended normal supervisory pressure 40 PSI Setting of NAMD 1 connected to valve trim Low air switch setting 28 PSI Setting allows normal variations in supervisory pressure to be ridden out without sending a low air supervisory signal Setting NAMD 1 connected to out...

Page 71: ...PURITY IN SPRINKLER SYSTEM PIPE SHOULD BEGIN TO INCREASE PROCEED TO 4 5 FINAL ACCEPTANCE 4 5 FINAL ACCEPTANCE Step Procedure Final Acceptance 1 After appropriate interval and with compressor running measure and record N2 purity percentage at Model SC W assembly test port using Model NA 2 Nitrogen Analyzer If nitrogen percentage at Model SC W assembly test port is below 98 needle valve may require ...

Page 72: ...hand held meter or TAP device G DRAIN draining accumulated moisture from Model SC W A B C D E F G VALVE NORMAL BYPASS PURGE FILTER SERVICE N2 PURITY AT TEST PORT N2 PURITY AT PVAs DRAIN MODEL SC W VALVES 1 Open handle facing UP Closed handle facing LEFT Open handle facing UP Open handle facing UP Open handle facing UP Open handle facing UP Open handle facing UP 2 Open Open Open Closed Open Open Cl...

Page 73: ... adjustments DO NOT DISTURB THE SETTING OF THIS NEEDLE VALVE Moving the needle valve can render the assembly incapable of producing 98 nitrogen Proper re adjustment of the needle valve requires training and instrumentation At any time if it appears that the Model SC W assembly is not generating 98 nitrogen contact UNITED Fire Systems for assistance IMPORTANT All valves should always be opened and ...

Page 74: ...WICM 000 63 Figure 38 Model SC W Assembly Components BYPASS BEACON ON OFF SELECTOR SWITCH PRESSURE GAUGES A B BYPASS BALL VALVE N2 PURITY TEST PORT OUTLET BALL VALVE REGULATOR PRESSURE RELIEF VALVE AIR COMPRESSOR COOLING FAN SEPARATOR MEMBRANE PARTICULATE FILTER COALESCING FILTER ENCLOSURE INLET FILTER ELEMENT WATER SEPARATOR ...

Page 75: ...m N2 Purity Test Port 5 2 2 Inspection of Enclosure Inlet Filter Element Model SC W Assembly a Refer to Figure 38 CAREFULLY remove inlet filter element from between enclosure and intercooler b Examine inlet filter element for dust accumulation Brush accumulated dust off surface c Replace inlet filter element by adhering to Velcro strips DO NOT reverse element side with dust accumulation should fac...

Page 76: ...below in Section 5 4 5 4 Specific Procedures Annual Maintenance 5 4 1 Replacement of Compressor Intake Filter Model SC W Assembly a Place ON OFF Selector Switch in the OFF position b Remove existing filter by unscrewing no tools required filter is hand tight c Discard existing filter d Replace with new filter by screwing on hand tight DO NOT USE TOOLS TO TIGHTEN FILTER e Place ON OFF Selector Swit...

Page 77: ...r bodies Note relative position of filter bowls BOWLS MUST NOT BE INTERCHANGED AT RE ASSEMBLY g Remove and discard used filter elements h Refer to Table 12 Replace with new filter elements j Re attached filter bowls to filter bodies Ensure proper filter bowl is attached to proper filter body and DO NOT interchange k Re attach drain tubing to bottom of each filter bowl m Place ON OFF Selector Switc...

Page 78: ...vice is installed open ball valve h If TAP device is not installed open ball valve only if purging is required 5 4 6 Replacement of Strainer at Model PVA Purge Vent Assembly Refer to Figure 39 a A clogged strainer may inhibit purging Replace strainer when clogged b If open CLOSE PVA ball valve c Hold PVA so that torque applied to drain plug does not move PVA d Apply suitable wrench to hex on strai...

Page 79: ...ED indicator is ON Model SC W assembly is in Bypass mode Verify position of valves has been restored to Nitrogen position Figure 34 Red SYSTEM BYPASSED indicator is OFF Model SC W assembly may not be producing nitrogen Check nitrogen purity at test port by using Model NA 2 analyzer 5 2 1 Model SC W assembly is producing 98 nitrogen when checked with Model NA 2 analyzer Valve 2 on Model SC W assemb...

Page 80: ...uge A for reading of 100 PSI If Gauge A reading is too low contact UNITED Fire Systems Low air signal Control panel monitoring sprinkler valve indicates SUPERVISORY LOW AIR condition Model NAMD 1 valves not properly positioned Position Model NAMD 1 ball valves properly Table 11 Model NAMD 1 regulator not properly adjusted Adjust Model NAMD 1 regulator to correspond with required supervisory pressu...

Page 81: ...Page 1 of 6 Model NA 2 Nitrogen Analyzer Hand Held OPERATING MANUAL INSTRUCTIONS FOR USE R218M06 Industrial ...

Page 82: ...fore use ensure that the protective seal has been removed from the sensing port Before use ensure that the analyzer has been properly calibrated Calibrate the analyzer if environmental conditions such as temperature humidity pressure or elevation have changed significantly Refer to Factors Influencing Accurate Readings Use of the analyzer near devices that generate electrical fields may cause erra...

Page 83: ...n concentration in sample gas Sample Inlet Connection This is the port at which the analyzer is connected to determine nitrogen concentration 3 PRINCIPLE OF OPERATION The instrument display corresponds directly to the oxygen sensor The oxygen diffuses through the membrane and an electrical current is generated that is proportional to the partial pressure of oxygen in the gas sample The oxygen perc...

Page 84: ...diluting the sampled gas up to 4 proportionately reducing the oxygen concentration For best results Do not use the analyzer in environments where condensation may occur Condensation can block the sampling tubing resulting in erroneous readings and slower response time Avoid use of the analyzer in environments greater than 95 relative humidity 6 CALIBRATION ERRORS AND ERROR CODES The N2 analyzer ha...

Page 85: ...nt in fluids Oxygen Sensor Clean the sensor with a cloth moistened with a 65 alcohol water solution Do not use spray disinfectants because they can contain salt which can accumulate in the sensor membrane and impair readings Accessory The threaded barbed adapter may be cleaned by washing with a 65 alcohol water solution The part must be thoroughly dry before it is re used 9 DISPOSAL Do not throw a...

Page 86: ... Environmental General purpose housing equivalent to NEMA 1 The analyzer is not waterproof 0 95 RH non condensing Power Requirement Powered by one internal non replaceable Lithium battery CR2450 Power on push button automatically shuts off after 80 seconds time out Electronics rated general purpose not for use in hazardous areas or for use with flammable gases Weight Approx 3 Ounces Battery Life A...

Page 87: ... The UNITED Fire Systems Model NAMD 1 is an FM Approved device for controlling the nitrogen and or air pressure in preaction and dry pipe fire sprinkler piping The device is equipped with a high precision pressure regulator capable of providing accurate regulation over a wide range of inlet pressures and gas flows This is especially important for sprinkler corrosion inhibiting systems supplying ni...

Page 88: ... pipe threads of the pipe only DO NOT permit pipe thread sealant to enter the device 1 8 Attach the piping from the OUTLET of the device to the proper connection point on the sprinkler valve trim Piping shall be 1 2 nominal pipe size minimum Use Teflon tape on the male threads of the pipe only DO NOT permit pipe thread sealant to enter the device 1 9 Proceed to the COMMISSIONING instructions below...

Page 89: ...ore proceeding 2 11 Check that pressure gauge continues to indicate 2 3 PSIG above supervisory pressure Adjust if necessary 2 12 Push pressure regulator adjustment knob DOWN 3 OPERATION Table 1 Valve Positions MODE INLET Shutoff Valve OUTLET Shutoff Valve BYPASS Valve No Gas Supply To Sprinkler Valve Closed Closed Closed Initial Fill With Air Closed Closed OPEN Supply System With Nitrogen OPEN OPE...

Page 90: ...d 4 2 1 Ensure there is no pressure present in the Model NAMD 1 device 4 2 2 Hold device so that torque applied to strainer screen retainer does not move the device 4 2 3 Refer to Figure 1 Apply suitable wrench to HEX on strainer screen retainer Do NOT remove square plug 4 2 4 Remove strainer screen retainer Retain for replacement 4 2 5 Examine rubber seal on strainer screen retainer If damaged du...

Page 91: ...connections complete Are all piping connections complete Is the water supply to the sprinkler valve s off Are all SC W assembly valves positioned for Nitrogen Generation see Quick Reference Valve Position Table all PVA valves CLOSED and all NAMD 1 valves CLOSED Is the POWER switch OFF STARTUP OK NOT OK Has the panelboard circuit breaker been turned ON Has the POWER switch been turned ON the GREEN ...

Page 92: ...s visual indicator flashing Have all valves on the Model NAMD 1 connected to the external air compressor been CLOSED Has AC power been applied to the external air compressor Has the inlet valve on the Model NAMD 1 connected to the external air compressor been OPENED Has the regulator on the Model NAMD 1 connected to the external air compressor been properly adjusted Has an inlet valve on one 1 Mod...

Page 93: ... 2 External Air Compressor Has the time on the Runtime Monitor been recorded Hours Minutes NOTE Initial time will NOT be zero Indicated time includes factory test run time and commissioning run time FINAL ACCEPTANCE OK NOT OK Are all valves in the NORMAL position per the Quick Reference Valve Position Table Has the Model NA 2 Nitrogen Analyzer been switched ON and calibrated if needed Have the N2 ...

Page 94: ...Open Open Closed TAP TRUE ADVANCED PURGE device Leave PVA inlet valve OPEN unless draining water at PVA location TAP device will be in control of purging COMMISSIONING WORKSHEET AND CHECKLIST NITROGEN PAC MODEL SC W SYSTEM UFS 622 REVISION 2 00 PAGE4 OF 4 A NORMAL System is providing N2 into sprinkler pipe B INITIAL FILL Compressed air into sprinkler pipe for initial fill max 30 minutes or air onl...

Page 95: ...ecked and cleaned if necessary 5 Are all valves at the Model SC W assembly positioned for Nitrogen Generation per the Quick Reference Valve Position Table 6 5 2 1 Has the nitrogen purity value at the Model SC W assembly N2 Purity Test Port and the Runtime Monitor value been checked and recorded below Model SC W Assembly N2 Purity Test Port Runtime Monitor HRS MIN 7 Have the values on the Model SC ...

Page 96: ...ODEL NAMD 1 ASSEMBLIES Inlet s Open Closed Open Open Open Open Open Outlet s Open Closed Open Open Open Open Open Bypass es Closed Open Closed Closed Closed Closed Closed MODEL PVA ASSEMBLIES PVA 4 with NA 2 Closed Closed Open Closed Closed Open Closed PVA 2 with TAP Open Open Open Open Open Open Closed TAP TRUE ADVANCED PURGE device Leave PVA inlet valve OPEN unless draining water at PVA location...

Page 97: ...IN VALVE GREEN VISUAL INDICATOR VALVE 2 EXHAUST FAN FILTER AND RETAINER N2 PURITY TEST PORT MONTHLY INSPECTION CHECKLIST NITROGEN PAC MODEL SC W SYSTEM UFS 623 REVISION 2 00 PAGE 3 OF 3 ENCLOSURE INLET FILTER ELEMENT APPENDIX D SC W MANUAL ...

Page 98: ...the valves are positioned for Nitrogen Generation does the bypass visual indicator turn OFF See Quick Reference Valve Position Table 7 Is the drain connection connected to a hose or piping leading to a proper drain 8 If present is the condensate drain pump properly connected and in good working order 9 5 4 1 Has the compressor inlet filter been replaced 10 5 4 2 Has the enclosure intake filter bee...

Page 99: ...A CAUTION Close inlet valve at PVA before attempting water drainage 3 5 4 6 If necessary has the strainer screen been replaced 4 5 2 4 Have the nitrogen purity values at the Model PVAs been checked with the Model NA 2 Nitrogen Analyzer or the Model TAP G3s MAINTENANCE MISCELLANEOUS STEP PROCEDURE OK NOT OK 1 Is all nitrogen piping secure and tight 2 Is the NA 2 Nitrogen Analyzer located in its pro...

Page 100: ...en Open Open Open Closed TAP TRUE ADVANCED PURGE device Leave PVA inlet valve OPEN unless draining water at PVA location TAP device will be in control of purging A NORMAL System is providing N2 into sprinkler pipe D FILTER SERVICE Filter elements in Model SC W assembly are to be replaced B INITIAL FILL Air into sprinkler pipe for initial fill max 30 minutes or air only if N2 not available E N2 PUR...

Page 101: ... GAUGES A and B PARTICULATE FILTER DRAIN VALVE GREEN VISUAL INDICATOR VALVE 2 N2 PURITY TEST PORT EXHAUST FAN FILTER AND RETAINER ENCLOSURE INLET FILTER ELEMENT ON OFF SELECTOR SWITCH RED BYPASS VISUAL INDICATOR PARTICULATE FILTER COALESCING FILTER WATER SEPARATOR VALVE 1 APPENDIX E SC W MANUAL ...

Page 102: ...APPENDIX F SC W MANUAL ...

Page 103: ...APPENDIX F SC W MANUAL ...

Page 104: ...APPENDIX G SC W MANUAL ...

Page 105: ...r for UNITED Fire Systems to return repaired or replacement equipment are not covered Consequential and incidental damages are not covered Some states do not allow the exclusion or limitation of incidental or consequential damages so this exclusion may not apply What Are The Customer s Responsibilities Ensuring that the UNITED Fire Systems equipment is installed commissioned operated and maintaine...

Page 106: ...ed Warranty is the entire warranty given by UNITED Fire Systems to the purchaser of new NITROGEN PAC SC SERIES equipment Component warranties supplied by component manufacturers to UNITED Fire Systems that are valid for a longer period of time than the UNITED Fire Systems Limited Warranty may apply Contact UNITED Fire Systems for more information There are no other warranties expressed or implied ...

Page 107: ...n repaired or replacement equipment are not covered Consequential and incidental damages are not covered Some states do not allow the exclusion or limitation of incidental or consequential damages so this exclusion may not apply What Are The Customer s Responsibilities Ensuring that the UNITED Fire Systems equipment is installed commissioned operated and maintained per the instructions in the appl...

Page 108: ...Warranty is the entire warranty given by UNITED Fire Systems to the purchaser of new TRUE ADVANCED PURGE equipment Component warranties supplied by component manufacturers to UNITED Fire Systems that are valid for a longer period of time than the UNITED Fire Systems Limited Warranty may apply Contact UNITED Fire Systems for more information There are no other warranties expressed or implied beyond...

Page 109: ...d or replacement equipment are not covered Consequential and incidental damages are not covered Some states do not allow the exclusion or limitation of incidental or consequential damages so this exclusion may not apply What Are The Customer s Responsibilities Ensuring that the UNITED Fire Systems equipment is installed commissioned operated and maintained per the instructions in the applicable UN...

Page 110: ...anty is the entire warranty given by UNITED Fire Systems to the purchaser of new SPRINKLER ACCESSORIES Component warranties supplied by component manufacturers to UNITED Fire Systems that are valid for a longer period of time than the UNITED Fire Systems Limited Warranty may apply Contact UNITED Fire Systems for more information There are no other warranties expressed or implied beyond those requi...

Page 111: ... THIS SURFACE DELIBERATELY LEFT BLANK ...

Page 112: ...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 ...

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