Page 1
Product Features
NS-ASAM
• Designed for two separate nitrogen or air sources
• Automatically switches between primary and secondary
source
• Bypass valve provided for quick fill of system
• Low-pressure switch for primary source
• For use on single or multiple systems
• Keyhole slots provided for easy wall mounting
Bulletin 254 May 2019
Nitrogen Automatic Pressure
Maintenance Devices
NS-Pak
• For bottled nitrogen use on a single system
• Low-pressure switches for nitrogen source and system
• Bypass valve provided for quick fill of system
• Keyhole slots provided for easy wall mounting
Nitrogen Regulator
• For bottled nitrogen use on single or multiple systems
• Low-pressure switch for nitrogen source
General Description
Reliable Nitrogen Automatic Pressure Maintenance Devices
are designed to connect nitrogen cylinders to dry pipe and
preaction systems. The NS-ASAM is designed to connect a
primary and secondary cylinder or bank of cylinders to single or multiple systems, and provides automatic switchover
between sources. The NS-Pak is a self-contained unit for connection of a cylinder or bank of cylinders to a single system.
The Nitrogen Regulator reduces cylinder pressure and can
be connected to the A-2 Pressure Maintenance Device on
single or multiple systems. Each device includes a low-pressure switch to signal that the nitrogen source is depleting and
needs service. High-pressure cylinders (not included) can
typically be obtained from a local source.
Model NS-ASAM
Model NS-Pak
Nitrogen Regulator
Model Product Description Listing and Approvals
NS-ASAM Nitrogen maintenance device with automatic switchover
NS-Pak
Nitrogen Regulator
Single system nitrogen maintenance device with high pressure
regulator
High-pressure regulator for connection to single or multiple pressure
maintenance devices
www.reliablesprinkler.com
cULus Listed
FM Approved
cULus Listed
FM Approved
N/A
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Model NS-ASAM
Technical Specifications
Threads: 1/2” NPT
Min. Inlet Pressure: 100 psi (6.9 bar)
Max. Inlet Pressure: 250 psi (17.2 bar)
Min. Outlet Pressure: 10 psi (0.7 bar)
Max. Outlet Pressure: 70 psi (4.8 bar)
Listings and Approvals
cULus Listed
FM Approved
System Operation
Primary and secondary sources of nitrogen or air are con-
nected to the primary and secondary inlets, respectively,
of the Model NS-ASAM Pressure Maintenance Device. The
primary and secondary nitrogen or air sources should sup-
ply a recommended pressure of 120 psi (8.3 bar) to the
NS-ASAM, although a minimum pressure of 100 psi (6.9
bar) up to a maximum pressure of 250 psi (17.2 bar) are
permitted. The NS-ASAM will admit nitrogen or air from the
primary source, until the primary source depletes to a pres-
sure of approximately 80 psi (5.5 bar). Nitrogen or air from
the secondary source is admitted through the NS-ASAM,
when the pressure of the nitrogen or air supplied by the
primary source is less than approximately 80 psi (5.5 bar).
A pressure switch in the NS-ASAM is factory-set to activate
at a pressure of 90 psi (6.2 bar) to indicate depletion of
the primary source. The pressure switch includes an aux-
iliary set of contacts that may be field adjusted to indicate
loss of pressure from the secondary source. The system
pressure may be set with the system pressure regulator of
the NS-ASAM. A bypass valve is provided to rapidly intro-
duce nitrogen or air into the system. Individual low-pressure
switches (not provided) should be installed in the dry pipe
or preaction valve trim to indicate low system pressure.
Model NS-ASAM Dimensions
Figure 1
Bulletin 254
May 2019
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Page 3
Model NS-ASAM Components
Figure 2
Installation and Adjustment
1. Securely mount the NS-ASAM enclosure to the wall using
the keyhole slots.
2. Confirm that all valves are closed.
3. Securely mount and properly pipe the primary and sec-
ondary sources of nitrogen or air in accordance with
appropriate local, state, or federal standards.
4. Connect the primary source of nitrogen or air to the prima ry inlet of the NS-ASAM and connect the secondary source
of nitrogen or air to the secondary inlet of the NS-ASAM.
5. Connect the NS-ASAM outlet to the port provided for pneu
matic supply to the sprinkler system (see note 1).
6. Before applying pressure to the sprinkler system, turn the
adjustment screw on the System Pressure Regulator within
the NS-ASAM fully counterclockwise.
7. Adjust the primary and secondary sources of nitrogen or
air to a recommended pressure of 120 psi (8.3 bar); the
minimum required inlet pressure is 100 psi (6.9 bar) and
the maximum rated inlet pressure is 250 psi (7.2 bar).
8. Open the Primary Inlet Valve and the Secondary Inlet
Valve.
9. Open the Bypass Valve and the NS-ASAM Outlet Valve to
allow nitrogen or air to flow into the system piping.
10. When the system pressure rises to within 2 psi (0.15 bar)
of the required system pressure, fully close the Bypass
Valve.
11. Slowly turn the adjustment screw of the System Pressure
Regulator clockwise to increase pressure to the level
required by the system. Tighten the lock-nut on the System
Pressure Regulator (see note 2).
12. If desired, supervise the contacts of the Pressure Switch in
accordance with NFPA 72 to provide notification that the
primary nitrogen or air source is depleted. The auxiliary
contacts of the pressure switch may also be supervised to
indicate depletion of the secondary source of nitrogen or
air. When supervising the auxiliary contacts, the primary
contacts of the pressure switch should remain at the
factory setting of 90 psi (6.2 bar) to indicate depletion of
the primary source and the auxiliary contacts should be
adjusted to a pressure setting of approximately 70 psi (4.8
bar).
13. If necessary, adjust the setting of the low-pressure switch
for each system.
14. Use a soap solution at all joints to verify leak-tight connec-
tions.
Notes:
1. When applying more that one system, each system must
have an individual Pressure Maintenance Device.
2. For multiple systems, the NS-ASAM system regulator must
be set a minimum of 5 psi above the highest system pres-
sure required. Use the regulator on the Pressure
Maintenance Device of each system to make final
adjustment.
Bulletin 254
May 2019
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Page 4
Model NS-Pak
Listings and Approvals
cULus Listed
Syetem Operation
High-pressure nitrogen contained in the cylinder(s) is
reduced by the adjustable regulator (included with NSPak) to a recommended setting of 100 psi (6.9 bar). The
high-pressure regulator supplies a field adjustable System
Pressure Regulator in the NS-Pak controlling pressure
to the system. As the cylinder pressure depletes below
90 psi (6.2 bar), the Inlet Pressure Switch activates to
indicate low nitrogen pressure and notify the owner that
the nitrogen supply requires servicing. The field adjustable
System Pressure Switch switch is factory preset to signal
low system pressure at approximately 13 psi (0.9 bar).
Model NS-Pak Dimensions
Figure 3
Bulletin 254
May 2019
Pressure Regulator
P/N 6999991570
Page 4 of 7
www.reliablesprinkler.com
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Model NS-Pak Components
Figure 4
Installation and Adjustment
1. Securely mount the NS-Pak enclosure to the wall using the
keyhole slots.
2. Confirm that all valves are closed.
3. To prevent damage to equipment and personal injury, con
firm that the nitrogen cylinder is securely mounted in accor-
dance with appropriate local, state, or federal standards.
4. Before connecting the Tank Pressure Regulator, inspect
both the cylinder outlet and the Tank Pressure Regulator
inlet for damaged threads or foreign matter. Remove foreign
matter with a clean cloth, and replace cylinders or pressure
regulators having damaged threads.
5. Momentarily open the cylinder control valve a small amount
to dislodge any foreign matter from inside the valve and
prepare it for mounting the Tank Pressure Regulator.
6. Apply thread sealant to male threads and tighten the Tank
Pressure Regulator to the cylinder control valve securely
with a wrench. Do not over tighten.
7. Using the the stainless steel hose provided, connect the
Tank Pressure regulator to the inlet of the NS-Pak assembly.
8. Using the stainless steel hose provided, connect the NS-
Pak outlet to the open port provided for pneumatic supply
to the sprinkler system (see note 1).
9. Before applying pressure to the system, turn the adjustment
screw on the System Pressure Regulator within the NS-Pak
fully counterclockwise.
Pressure Regulator
P/N 6999991570
10. Open the cylinder control valve and supply inlet valve in
the NS-Pak.
11. Open the Bypass Valve and the NS-Pak Outlet Valve to
allow nitrogen to flow into the system piping.
12. When the system pressure rises to within 2 psi of required
system pressure, fully close the Bypass Valve.
13. Slowly turn the adjustment screw of the System Pressure
Regulator clockwise to increase pressure to the level
required by the system. Tighten the lock-nut on the System
Pressure Regulator.
14. If necessary adjust the pressure setting of the System
Pressure Switch based upon the system pressure
(see note 2).
15. Use a soap solution at all joints to verify leak-tight connec-
tions.
Notes:
1. The check valve provided with the stainless steel hose
must be installed in the horizontal position.
2. The System Pressure Switch in the NS-Pak replaces the
low-pressure switch normally located at the dry pipe or
deluge valve.
Bulletin 254
May 2019
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Page 6
Nitrogen Regulator
Product Description
High-pressure nitrogen contained in the cylinder is
reduced by the Nitrogen Regulator. The Nitrogen
Regulator supplies one or more Pressure Maintenance Device(s) (not included) controlling pressure
to the sprinkler system(s). As the cylinder pressure
depletes below 90 psi (6.2 bar), the Optional Low
Pressure Switch activates to indicate low nitrogen
pressure. Individual low pressure switches (not provided) installed on dry pipe or preaction valve trim
provide notification of low system pressure.
Nitrogen Regulator Components
Installation and Adjustment
1. Confirm that all valves are closed.
2. To prevent damage to equipment and personal injury, con-
firm that nitrogen cylinders are securely mounted in accor dance with local, state, or federal standards.
3. Before connecting the Nitrogen Regulator, inspect both
the cylinder outlet and the Nitrogen regulator inlet for
damaged threads or foreign matter. Remove foreign matter
with a clean cloth, and replace cylinders or Nitrogen
Regulators having damaged threads.
4. Momentarily open the cylinder control valve a small amount
to dislodge any foreign matter from inside the valve and
prepare it for the Nitrogen Regulator mounting.
5. Apply thread sealant to male threads and tighten the Nitro-
gen regulator to the cylinder control valve securely with a
wrench. Do not over tighten.
6. Using the copper tubing provided, connect the Nitrogen
Regulator to the inlet of Pressure Maintenance
Device (not provided) (see note).
7. Before applying pressure to the system, turn the adjustment
screw on the regulator of the Pressure Maintenance Device
fully counterclockwise.
Figure 5
Pressure Regulator
P/N 6999991570
8. Open the cylinder control valve.
9. Open the bypass valve of the Pressure Maintenance De-
vice to allow nitrogen to flow into system piping.
10. When the system pressure rises to within 2 psi of required
system pressure, fully close the bypass valve.
11. Slowly turn the adjustment screw of the Pressure Mainte-
nance Device regulator clockwise to increase pressure to
the level required by the system. Tighten lock-nut on
pressure regulator.
12. If necessary, adjust the setting of the low-pressure switch
for each system.
13. Use a soap solution at all joint to verify leak-tight connec-
tions.
Note:
The Nitrogen Regulator can supply a single system or multiple
systems. When supplying more than one system, each system
must have a Pressure Maintenance Device. Follow steps 7-12
for each system.
Bulletin 254
May 2019
www.reliablesprinkler.com
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Page 7
Maintenance
Guarantee
The owner is responsible for maintaining all parts of the fire protection system in proper operating condition. Any system maintenance or testing that involves placing a system component out
of service may eliminate the fire protection that is provided by the
fire protection system.
The Reliable Model NS-ASAM, NS-Pak, and Nitrogen Regulator
shall periodically be given a thorough inspection and test. NFPA
25, “Inspection, Testing, and Maintenance of Water Based Fire
Protection Systems,” provides minimum maintenance requirements. System components shall be tested, operated, cleaned
and inspected at least annually and parts replaced as required.
Caution
The transportation, handling, installation, and restraint of
high-pressure cylinders must be performed in accordance with
local, state, and federal standards.
For the Reliable Automatic Sprinkler Co., Inc. guarantee, terms,
and conditions, visit www.reliablesprinkler.com.
Patents
Patent Pending (Model NS-ASAM)
Ordering Information
Specify the following when ordering.
Model NS-ASAM
Model NS-Pak
Nitrogen Maintenance Device
Pressure Switch Kit: None, UL Listed, ULC Listed
Bulletin 254
May 2019
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