I-768N - Victaulic
I-768N
INSTALLATION, MAINTENANCE, AND TESTING MANUAL
Series 768N FireLock NXT™ Dry Valve
KEEP THESE INSTRUCTIONS WITH THE
INSTALLED VALVE FOR FUTURE REFERENCE
WARNING
• Read and understand all instructions before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping products.
• Depressurize and drain piping systems before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping
products.
• Wear safety glasses, hardhat, and foot protection.
• Save this installation, maintenance, and testing manual for future reference.
Failure to follow instructions and warnings could cause system failure, resulting in death or serious personal injury and property damage.
REV_C
I-768N
SERIES 768N FIRELOCK NXT™
DRY VALVE
THIS QUICK REFERENCE SECTION IS FOR PLACING THE SYSTEM IN SERVICE AND FOR PERFORMING WATER FLOW ALARM TESTS.
AN EXPERIENCED, TRAINED INSTALLER MUST READ AND UNDERSTAND THE FULL CONTENTS OF THIS MANUAL AND ALL WARNING
MESSAGES BEFORE ATTEMPTING TO PLACE THE SYSTEM INTO SERVICE.
INITIAL SYSTEM SETUP
Step 1:
Confirm that all system drains are shut and that the system is free of leaks.
Step 2:
Confirm that the system has been depressurized. The gauges should indicate zero pressure.
Step 2a: If a Series 746-LPA Dry Accelerator is installed, confirm that the isolation ball valve is closed.
Step 2b: If a Series 746-LPA Dry Accelerator is installed, open the 1/4-turn vent ball valve.
Step 3:
Confirm that the alarm test ball valve is closed.
Step 4:
Charge the system with air by turning on the compressor or by opening the fast-fill ball valve on the air maintenance trim assembly (AMTA). Charge
the system to 13 psi/90 kPa/0.9 Bar minimum.
Step 5:
When the system reaches approximately 10 psi/69 kPa/0.7 Bar, and no additional moisture is being released from the Auto Vent, pull up on the Auto
Vent Sleeve of the Series 776 Low-Pressure Actuator. NOTE: The Auto Vent Screw should seal and remain in the set (“UP”) position.
Step 6:
When system air pressure is established, close the fast-fill ball valve on the AMTA.
Step 7:
Open the slow-fill ball valve on the AMTA. NOTE: Failure to leave the slow-fill ball valve open may allow system pressure to drop, resulting in valve
operation in the event of a system leak.
Step 8:
Open the charge line ball valve. Allow water to flow through the auto drain tube.
Step 9:
Pull up on the auto drain sleeve until the screw is in the set (“UP”) position. Verify that there is pressure on the gauge to the charge line.
Step 9a: If a Series 746-LPA Dry Accelerator is installed, close the 1/4-turn vent ball valve.
Step 9b: If a Series 746-LPA Dry Accelerator is installed, open the isolation ball valve. This will set the accelerator.
Step 10:
Open the water supply main drain valve.
Step 11:
Open the water supply main control valve slowly until water flows steadily from the open water supply main drain valve.
Step 12:
Close the water supply main drain valve when a steady flow of water occurs.
Step 13:
Open the water supply main control valve fully.
Step 14:
Confirm that all valves are in their normal operating positions (refer to the table below).
NORMAL OPERATING POSITIONS FOR VALVES
Valve
Normal
Operating
Position
Valve
Normal
Operating
Position
Water Supply Main Control Valve
Open
Isolation Ball Valve for Series 746-LPA Dry Accelerator (if a­ pplicable)
Open
Water Supply Main Drain Valve
Closed
1/4-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator (if a­ pplicable)
Closed
System Main Drain Valve
Closed
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable)
Open
Charge Line Ball Valve of the Priming Manifold Assembly
Open
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable)
Closed
Alarm Test Ball Valve of the Priming Manifold Assembly
Closed
NOTE: The minimum air pressure for a Series 768N FireLock NXT Dry Valve installed with or without a Series 746-LPA Dry Accelerator shall be
13 psi/90 kPa/0.9 Bar. The maximum air pressure shall be 20 psi/138 kPa/1.4 Bar.
Auto Drain
Sleeve
Ball Drip
Plunger
Auto Vent
Sleeve of
Series 776
Low-Pressure
Actuator
Water Supply
Main Control
Valve
Charge
Line Ball
Valve
System Main
Drain Valve
Water Supply
Main Drain
Valve
Alarm Test
Ball Valve
WATER FLOW ALARM TEST
Perform the water flow alarm test on a frequency required by the c­ urrent NFPA-25 code. The authority having jurisdiction in the area may require
these tests on a more frequent basis. Verify these requirements by contacting the authority having jurisdiction in the affected area.
1.
Notify the authority having jurisdiction, remote station alarm monitors, and those in the affected area that the water flow alarm test will be
performed.
2.
Open the water supply main drain valve fully to flush the water supply of any contaminants.
3.
Close the water supply main drain valve.
4.
Open the alarm test ball valve. Confirm that mechanical and electrical alarms are activated and that remote monitoring stations, if provided,
receive an alarm ­signal.
5.
Close the alarm test ball valve after verifying proper operation of all alarms.
6.
Push in the ball drip plunger on the alarm manifold assembly to verify that there is no pressure in the alarm line.
7.
Verify that all alarms stopped sounding, that the alarm line drained properly, and that remote station alarms reset properly.
8.
Confirm that the ball drip on the alarm manifold assembly is not leaking water or air.
9.
Provide test results to the authority having jurisdiction, if required.
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
TABLE OF CONTENTS
Hazard Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installer Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Important Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydrostatic Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Receiving the Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Trim Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Trim Components - Exploded View Drawing . . . . . . . . . . . . . . . . . . . 7
Internal Valve Components - Section View and
Exploded View Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Air Supply Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Base- or Riser-Mounted Air Compressors . . . . . . . . . . . . . . . . . . . . . 9
Shop Air or Tank-Mounted Air Compressors . . . . . . . . . . . . . . . . . . . 9
Compressor Requirements and Settings for a Series 768N FireLock
NXT Dry Valve Installed with a Series 746-LPA Dry Accelerator . . . . 9
Settings for Air Supervisory Pressure Switches and Alarm
Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SECTION I
Initial System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SECTION II
Resetting the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SECTION III
Weekly External Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Monthly External Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SECTION IV
Required Main Drain Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Required Water Flow Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Required Water Level and Low-Air Alarm Tests . . . . . . . . . . . . . . . . 21
Required Partial Operational Trip Test . . . . . . . . . . . . . . . . . . . . . . . 22
Required Full Operational Trip Test . . . . . . . . . . . . . . . . . . . . . . . . . 23
SECTION V
Required Internal Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SECTION VI
Removing and Replacing the Clapper Seal . . . . . . . . . . . . . . . . . . . 27
Removing and Replacing the Clapper Assembly . . . . . . . . . . . . . . . 28
Installing the Cover Plate Gasket and Cover Plate . . . . . . . . . . . . . . 29
Removing and Replacing the Diaphragm Assembly . . . . . . . . . . . . . 30
Cleaning the Cartridge in the Air and Priming
Manifold Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Replacing the Filter in Series 776 Low-Pressure Actuators . . . . . . . 31
SECTION VII
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
HAZARD IDENTIFICATION
Definitions for identifying the various hazard levels are
­provided below. When you see this symbol, be alert to the
possibility of personal injury. Carefully read and fully
u­nderstand the message that follows.
INSTALLER SAFETY INFORMATION
WARNING
• An experienced, trained installer must install this product in
accordance with all instructions. These i­nstructions contain
important information.
• Depressurize and drain the piping system before attempting to
install, remove, adjust, or maintain any Victaulic piping products.
Failure to follow these instructions can cause product failure,
resulting in death or serious personal injury and ­property damage.
1.
Read and understand all instructions and refer to the trim
diagrams before installing, maintaining, or testing this Victaulic
Series 768N FireLock NXT Dry Valve. For proper operation
and approval, the Series 768N FireLock NXT Dry Valve and
accessories must be installed in accordance with the specific trim
diagrams included with the shipment.
2.
Use only recommended accessories. Accessories and equipment
that are not approved for use with this dry valve may cause
improper system operation and property damage.
3.
Wear safety glasses, hardhat, foot protection, and hearing
­protection. Wear hearing protection if you are exposed to long
periods of noisy jobsite operations.
4.
Prevent back injury. Valve assemblies require more than one
person (or mechanical lifting equipment) to position and install the
assembly. Always practice proper lifting techniques.
5.
Keep work areas clean. Keep the work area clean and well lit, and
allow enough space to accommodate proper installation of the
valve, trim, and accessories.
6.
Avoid pinch points. Due to the weight of the valve body, use
caution around pinch points and spring-loaded components
(i.e. clapper assembly) in order to prevent bodily injury.
IMPORTANT INSTALLATION INFORMATION
1.
Confirm that adequate space is available for valve, trim, and
accessories. Refer to page 6 for dimensional information.
2.
Flush water supply piping. Before installing the Series 768N
FireLock NXT Dry Valve, flush the water supply piping thoroughly
to remove all foreign material.
3.
Protect system from freezing temperatures. Series 768N FireLock
NXT Dry Valves and supply piping MUST NOT be located in an
area where the valve can be exposed to freezing temperatures or
mechanical damage.
4.
Confirm material compatibility. It is the system designer’s
responsibility to confirm material compatibility of the Series 768N
FireLock NXT Dry Valve, trim, and associated accessories when a
corrosive environment or contaminated water is present.
5.
Supply air or nitrogen to the system. Air or nitrogen supply to the
dry piping system must be clean, dry, and oil-free and must be
regulated, restricted, and uninterrupted. Refer to the “Air Supply
Requirements” section. Observe the system air pressure over a
24-hour period to confirm system integrity. If there is degradation
in system air pressure, find and correct all leaks. NOTE: NFPA
requires less than 11/2-psi/10-kPa/0.1-Bar leakage in 24 hours.
6.
Supply water to the system. Supply pressure to the charge line
by providing an uninterrupted source of water from upstream of
the main control valve. When an uninterrupted water flow alarm is
required, Victaulic recommends the use of a low-pressure alarm
WARNING
• The use of the word “WARNING” identifies the presence of
hazards or unsafe practices that could result in death or ­serious
personal injury and property damage if instructions are not
followed.
CAUTION
• The use of the word “CAUTION” identifies possible ­hazards or
unsafe practices that could result in personal injury and ­product
or property damage if instructions are not followed.
NOTICE
• The use of the word “NOTICE” identifies special instructions
that are important but not related to hazards.
I-768N_4
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
installed on the charge line downstream of the priming manifold
assembly. Another option is to install a Series 75B Supplemental
Alarm Device.
7.
8.
Pitch the water supply piping. Per NFPA 13 requirements, piping
must be pitched so that s­ ystems can drain properly. For areas that
are subject to high levels of condensation, or where piping is not
properly pitched, an optional Series 75D Water Column Device kit
is available to assist in a­utomatically draining water out of the riser.
IF THE INLET WATER SUPPLY IS INTERRUPTED FOR ANY
REASON, AND SYSTEM SUPPLY PRESSURE TO THE VALVE
DECREASES, ENSURE THAT THE CHARGE LINE IS FULLY
PRESSURIZED BEFORE PLACING THE ­SYSTEM BACK IN
SERVICE.
HYDROSTATIC TESTING
WARNING
• If air testing is required, DO NOT exceed
50 psi/345 kPa/3.4 Bar air pressure.
1.
CAUTION
• Ensure that all protective shipping items are removed from the
interior and exterior of the valve body before installation.
• Ensure that no foreign material gets into the valve body, pipe
nipples, or valve openings.
• If using any material other than PTFE thread sealant tape, use
extra caution so that material does not enter the trim.
Failure to follow these instructions could cause improper valve
operation, resulting in personal injury and property damage.
2.
Remove all plastic caps and foam spacers from the valve.
3.
Install the valve assembly into the riser with two Victaulic rigid
couplings. Refer to the instructions, supplied with the coupling, for
complete installation requirements. SERIES 768N FIRELOCK NXT
DRY VALVES MUST BE INSTALLED ONLY IN THE VERTICAL
POSITION WITH THE ARROW ON THE BODY POINTING
UPWARD.
4.
For components shipped separate from the valve, apply a small
amount of pipe joint compound or PTFE thread sealant tape to
the external threads of all threaded connections. DO NOT get any
tape, compound, or other foreign material into the openings of the
threaded connections.
Failure to follow this instruction could result in
death or serious personal injury and property
­damage.
The Series 768N FireLock NXT Dry Valve is cULus Listed and
FM Approved for a maximum working pressure of:
• 300 psi/2065 kPa/20.7 Bar
The Series 768N FireLock NXT Dry Valve is factory tested to:
• 600 psi/4135 kPa/4.1 Bar (all sizes)
The valve can be hydrostatically tested against the clapper at:
• 200 psi/1380 kPa/13.8 Bar or 50 psi/345 kPa/3.4 Bar above the normal water supply pressure (2-hour limited time period) for acceptance by the authority having jurisdiction
Ensure that all components are included in the shipment and that
all necessary tools are available for installation. Verify that the
provided trim drawing matches the system’s requirements.
4a. FOR VALVES INSTALLED WITH A SERIES 746-LPA DRY
ACCELERATOR: The end with the vent seal “button” must be
installed facing down (toward the trim), in accordance with the trim
drawing provided.
RECEIVING THE SHIPMENT
NOTICE
• Drawings and/or pictures in this manual may be exaggerated for
clarity.
• This product and this installation, maintenance, and testing
manual contain trademarks, copyrights, and/or patented features
that are the exclusive property of Victaulic.
The components shaded in orange below are shipped separate from
the valve and must be installed in accordance with the trim drawing
provided. NOTE: The Vic-Quick Riser (VQR) assembly is shown.
Compression Fitting and Tube Configuration
for Auto Drain and Alarm Manifold Assembly
Compression Fitting and Tube Configuration
for Actuator
5.
REV_C
Compression fittings and tubes are provided for connection
from the outlet of the auto drain, alarm manifold assembly, and
actuator to the drip cup or drain. Install the compression fittings
in accordance with the trim drawing provided. NEVER INSERT
A PLUG INTO THE OUTLET OF THE AUTO DRAIN, ALARM
MANIFOLD ASSEMBLY, OR ACTUATOR IN PLACE OF THE
COMPRESSION FITTING/TUBE.
I-768N_5
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
TRIM DIMENSIONS
A 4-INCH/114.3-MM FIRELOCK NXT™ DRY VALVE IS SHOWN BELOW
1 1/2 – 2-INCH/48.3 – 60.3-MM CONFIGURATIONS CONTAIN 3/4-INCH/19-MM DRAIN VALVES
2 1/2 – 3-INCH/73.0 – 88.9-MM CONFIGURATIONS CONTAIN 1 1/4-INCH/31-MM DRAIN VALVES
4 – 8-INCH/114.3 – 219.1-MM CONFIGURATIONS CONTAIN 2-INCH/50-MM DRAIN VALVES
H
B
A
D1
A1
D
G
K
F
E
C
Full Open
NOTES:
The “A” dimension is the actual takeout dimension of the valve body.
The “A1” dimension is the actual takeout dimension of the valve body with water supply main control valve.
For systems with the optional Series 746-LPA Dry Accelerator, add 11.50 inches/292 mm to the “B” dimension to account for the additional height.
The “D” and “D1” dimensions are not fixed measurements. The drip cup can be rotated to provide more clearance at the back of the trim.
Components shown as dotted lines denote optional equipment.
The recommended drain connection kit (shaded in orange) is for reference and takeout dimensions. This drain connection comes standard when the VQR
assembly is ordered.
Nominal
Size
inches
or mm
Approx Weight Each
lbs/kg
Dimensions – inches/mm
A
9.00
228.60
A1
16.37
415.80
B
32.75
832
C
9.25
235
D
16.50
419
D1
11.00
279
E
9.25
235
F
3.25
83
G
10.25
260
H
22.50
572
K
6.00
152
Without
Trim
16.7
7.6
With
Trim
43.0
19.5
2
9.00
228.60
13.83
351.28
32.75
832
9.25
235
17.50
445
11.00
279
9.25
235
3.25
83
10.25
260
22.50
572
6.00
152
17.0
7.7
43.0
19.5
2 ½
12.61
320.29
16.51
419.35
34.50
876
11.25
286
20.00
508
12.50
318
9.75
248
4.00
102
9.75
248
24.75
629
6.50
165
41.0
18.7
65.0
29.5
76.1 mm
12.61
320.29
16.51
419.35
34.50
876
11.25
286
20.00
508
12.50
318
9.75
248
4.00
102
9.75
248
24.75
629
6.50
165
41.0
18.7
65.0
29.5
3
12.61
320.29
16.51
419.35
34.50
876
11.25
286
20.00
508
12.50
318
9.75
248
4.00
102
9.75
248
24.75
629
6.50
165
41.0
18.7
65.0
29.5
4
15.03
381.76
19.85
504.19
35.25
895
13.50
343
22.25
565
13.50
343
11.00
279
4.75
121
8.50
216
26.75
680
8.00
203
59.0
26.7
95.0
43.0
165.1 mm
16.00
406.40
22.13
562.10
36.25
921
14.00
356
24.50
622
13.25
337
11.25
286
4.50
114
8.25
210
28.00
711
8.25
210
80.0
36.2
116.0
52.6
6
16.00
406.40
22.13
562.10
36.25
921
14.00
356
24.50
622
13.25
337
11.25
286
4.50
114
8.25
210
28.00
711
8.25
210
80.0
36.2
116.0
52.6
8
17.50
444.50
23.02
584.71
38.00
965
14.75
375
27.00
686
13.50
343
12.25
311
4.75
121
8.25
210
29.75
756
9.25
235
122.0
55.3
158.0
71.6
1 ½
I-768N_6
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
TRIM COMPONENTS – EXPLODED VIEW DRAWING
9
8
10
12
7
11
6
13
14
5
1
16
15
17
2
4
3
Orange shaded areas identify components that are optional equipment.
These components are standard when the VQR assembly is ordered.
Gray shaded areas identify components that are optional equipment.
Item
Description
1
Series 768N FireLock NXT Dry Valve
2
3
Item
Description
10
Air Manifold
FireLock Rigid Coupling
11
Series 776 Low-Pressure Actuator
Water Supply Main Control Valve
12
Charge Line Pressure Gauge/Gauge Valve Assembly
4
Drip Cup
13
Alarm Pressure Switch
5
Water Supply Main Drain Valve – Flow Test
14
Priming Manifold Assembly
6
System Pressure Gauge/Gauge Valve Assembly
15
Alarm Manifold Assembly
7
System Main Drain Valve
16
Series 760 Water Motor Alarm Assembly
8
Air Supervisory Pressure Switch
17
Water Supply Pressure Gauge/Gauge Valve Assembly
9
Series 746-LPA Dry Accelerator Assembly
REV_C
I-768N_7
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
INTERNAL VALVE COMPONENTS – SECTION VIEW AND EXPLODED VIEW DRAWINGS
Clapper
Latch
Diaphragm
Assembly
19
Clapper Seal
18
Seat
17
Exaggerated for Clarity
16
Valve is shown in the “set” position
10
14
20
15
2
3
16
9
1
10
8
4
5
12
6
11
7
13
The 1½-inch/48.3-mm and 2-inch/60.3-mm valve sizes contain washers under the heads of the cover plate bolts.
Item
Description
1
Valve Body
2
3
Item
Description
11
Cover Plate
Clapper
12
Cover Plate Gasket
Clapper Seal
13
Cover Plate Bolts
4
Seal Ring
14
Latch
5
Seal Washer*
15
Latch Spring
6
Seal Retaining Ring
16
Latch Spring Bushing and O-Ring (Qty. 2)
7
Seal Assembly Bolt
17
Diaphragm
8
Clapper Spring
18
Diaphragm Cover
9
Clapper Shaft
19
Diaphragm Cover Cap Screws (Qty. 8)
10
Clapper Shaft Bushing and O-Ring (Qty. 2)
20
Latch Shaft
* Item 5 (Seal Washer) is not used in 11/2-inch/48.3-mm and 2-inch/60.3-mm valve sizes.
I-768N_8
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
AIR SUPPLY REQUIREMENTS
The required air pressure for Series 768N FireLock NXT Dry Valves is 13 psi/90 kPa/0.9 Bar minimum, regardless of the system supply water
pressure. Normal air pressure should not exceed 20 psi/138 kPa/1.4 Bar. Failure to maintain air pressure within the 13 psi/90 kPa/0.9 Bar to
18 psi/124 kPa/1.2 Bar range may delay system operation response time.
The Series 746-LPA Dry Accelerator must be used only on systems operating below 20 psi/138 kPa/1.4 Bar of air. If air pressure is higher than
20 psi/138 kPa/1.4 Bar, the Series 746 Dry Accelerator should be used.
FOR VdS APPROVED VALVES ONLY: The minimum air pressure for Series 768N FireLock NXT Dry Valves installed with Series 746-LPA Dry
Accelerators shall be 16 psi/110 kPa/1.1 Bar. The maximum air pressure shall be 19 psi/130 kPa/1.3 Bar.
If multiple Series 768N FireLock NXT Dry Valves are installed with a common air supply, isolate the systems with a spring-loaded, soft-seated ball
check valve to ensure air integrity for each system. Good practice is to include a ball valve for isolation and service of each individual system.
The engineer/system designer is responsible for sizing the compressor so that the entire system is charged to the required air pressure within
30 minutes. DO NOT oversize the compressor to provide more airflow. An oversized compressor will slow down or possibly prevent valve operation.
If the compressor fills the system too fast, it may be necessary to restrict the air supply. Restricting the air supply will ensure that air being exhausted
from an open sprinkler or manual release valve is not replaced by the air supply system as fast as it is being exhausted.
BASE- OR RISER-MOUNTED AIR COMPRESSORS
For base- or riser-mounted air compressors, the recommended air pressure of 13 psi/90 kPa/0.9 Bar is the “on” or “low” pressure setting for the
compressor. The “off” or “high” pressure setting should be 18 psi/124 kPa/1.2 Bar.
When a base- or riser-mounted air compressor supplies air to a Series 768N FireLock NXT Dry Valve, it is not necessary to install the Victaulic Series
757 Regulated Air Maintenance Trim Assembly (AMTA). In this case, the air line of the compressor connects to the trim at the fitting where the Series
757 Regulated AMTA is installed normally (refer to the applicable trim drawing). If the compressor is not equipped with a pressure switch, the Series
757P Air Maintenance Trim Assembly with Pressure Switch should be installed.
NOTICE
• Victaulic recommends a maximum of two Series 768N FireLock NXT Dry Valves per Series 757 Regulated AMTA or Series 757P AMTA with
Pressure Switch.
SHOP AIR OR TANK-MOUNTED AIR COMPRESSORS
In the event a compressor becomes inoperative, a properly sized tank-mounted air compressor provides the greatest protection for systems.
When shop air or a tank-mounted air compressor is used, the Series 757 Regulated AMTA must be installed. The Series 757 Regulated AMTA
provides proper air regulation from the air reservoir to the sprinkler system.
For tank-mounted air compressors, the recommended air pressure of 13 psi/90 kPa/0.9 Bar should be used as the set point for the air regulator. The
“on” pressure of the compressor should be at least 5 psi/34 kPa/0.3 Bar above the set point of the air regulator.
COMPRESSOR REQUIREMENTS AND SETTINGS FOR A SERIES 768N FIRELOCK NXT DRY VALVE
INSTALLED WITH A SERIES 746-LPA DRY ACCELERATOR
Set the air regulator of the Series 757 Regulated AMTA to a minimum of 13 psi/90 kPa/0.9 Bar.
FOR VdS APPROVED VALVES ONLY: The minimum air pressure for Series 768N FireLock NXT Dry Valves installed with Series 746-LPA Dry
Accelerators shall be 16 psi/110 kPa/1.1 Bar. The maximum air pressure shall be 19 psi/130 kPa/1.3 Bar.
The Series 757P Air Maintenance Trim Assembly with Pressure Switch MUST NOT be used on a Series 768N FireLock NXT Dry Valve installed
with a Series 746-LPA Dry Accelerator, unless a tank and air regulator are added.
In the event a compressor becomes inoperative, a properly sized tank-mounted air compressor provides the greatest protection for systems installed
with a Series 746-LPA Dry Accelerator. In this situation, air can be supplied continuously to the sprinkler system for an extended time period.
NOTE: The Series 757 Regulated AMTA should be used with a tank-mounted air compressor to supply air to a Series 768N FireLock NXT Dry Valve
when the Series 746-LPA Dry Accelerator is used. The use of an air regulator with a base- or riser-mounted air c­ ompressor could cause short cycling,
resulting in premature wear of the c­ ompressor.
The air regulator of the Series 757 Regulated AMTA is a relief-type design. Any pressure in the system that is above the set point of the air regulator
will be released. Therefore, charging the air regulator above the set point could cause premature operation of a valve installed with a Series 746-LPA
Dry Accelerator.
SETTINGS FOR AIR SUPERVISORY PRESSURE SWITCHES AND ALARM PRESSURE SWITCHES
1.
Air supervisory pressure switches are required for dry systems and must be set according to the following notes. NOTE: Switches for VQR
assemblies are pre-set at the factory.
1a. Wire the air supervisory pressure switches to activate a low-pressure alarm signal. NOTE: In addition, the local authority having jurisdiction may require a high-pressure alarm. Contact the local authority having jurisdiction for this requirement.
1b. Set the air supervisory pressure switches to activate at 2 – 4 psi/14 – 28 kPa/0.1 – 0.3 Bar below the minimum air pressure required (but not lower than 10 psi/69 kPa/0.7 Bar).
1c. Wire the alarm pressure switch to activate a water flow alarm.
1d. Set the alarm pressure switch to activate on a pressure rise of 4 – 8 psi/28 – 55 kPa/0.3 – 0.6 Bar.
REV_C
I-768N_9
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
SECTION I
•
I-768N_10
Initial System Setup
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
INITIAL SYSTEM SETUP
Step 1:
Step 5:
Confirm that all system drains are shut and that the system is free of
leaks.
When the system reaches approximately 10 psi/69 kPa/0.7 Bar, and no
additional moisture is being released from the Auto Vent, pull up on the
Auto Vent Sleeve of the Series 776 Low-Pressure Actuator. NOTE: The
Auto Vent Screw should seal and remain in the set (“UP”) position.
Step 2:
Confirm that the system has been depressurized. The gauges should
indicate zero pressure.
Step 6:
Step 2a: If a Series 746-LPA Dry Accelerator is installed, confirm
that the isolation ball valve is closed.
When system air pressure is established, close the fast-fill ball valve on
the AMTA.
Step 2b: If a Series 746-LPA Dry Accelerator is installed, open
the 1/4-turn vent ball valve.
Step 7:
Step 3:
Confirm that the alarm test ball valve is closed.
Open the slow-fill ball valve on the AMTA. NOTE: Failure to leave the
slow-fill ball valve open may allow system pressure to drop, resulting in
valve operation in the event of a system leak.
Step 4:
Charge the system with air by turning on the compressor or by
opening the fast-fill ball valve on the AMTA. Charge the system to
13 psi/90 kPa/0.9 Bar minimum. Refer to the “Air Supply Requirements”
section.
Auto Vent
Sleeve of
Series 776
Low-Pressure
Actuator
(Step 5)
Alarm Test
Ball Valve
(Step 3)
REV_C
I-768N_11
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
INITIAL SYSTEM SETUP (CONTINUED)
Step 8:
Open the charge line ball valve. Allow water to flow through the auto
drain tube.
Step 9:
Verify that the charge line pressure is equal to the supply pressure, and
verify that the auto drain is set by pulling up on the auto drain sleeve.
Step 9a: If a Series 746-LPA Dry Accelerator is installed, close the 1/4-turn vent ball valve.
Step 9b: If a Series 746-LPA Dry Accelerator is installed, open the isolation ball valve. This will set the accelerator.
Auto Drain
Sleeve
(Step 9)
Charge
Line Ball
Valve
(Step 8)
I-768N_12
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
INITIAL SYSTEM SETUP (CONTINUED)
Step 10:
Step 15:
Open the water supply main drain valve.
Notify the authority having jurisdiction, remote station alarm monitors,
and those in the affected area that the system is in service.
Step 11:
Open the water supply main control valve slowly until water flows
steadily from the open water supply main drain valve.
Step 12:
Close the water supply main drain valve when a steady flow of water
occurs.
Step 13:
Open the water supply main control valve fully.
Step 14:
Confirm that all valves are in their normal operating positions (refer to
the table to the right).
Valve
Normal Operating Position
Water Supply Main Control Valve
Open
Water Supply Main Drain Valve
Closed
System Main Drain Valve
Closed
Charge Line Ball Valve of the Priming Manifold Assembly
Open
Alarm Test Ball Valve of the Priming Manifold Assembly
Closed
Isolation Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Open
1/4-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Closed
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable)
Open
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable)
Closed
CAUTION
• Take precautions when
opening the water
supply main control
valve, since water will
flow from all open
system valves.
Failure to follow this
instruction could result in
property damage.
Water Supply
Main Drain
Valve (Steps
10 & 12)
Water Supply
Main Control
Valve
(Steps 11 & 13)
REV_C
I-768N_13
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
SECTION II
•
I-768N_14
Resetting the System
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
RESETTING THE SYSTEM
Step 1:
Step 6:
Isolate the charge line ball valve by placing it in the closed position.
Step 2:
Confirm that the system has been depressurized. The gauges should
indicate zero pressure.
Close the water supply main control valve.
Step 6a: If a Series 746-LPA Dry Accelerator is installed, confirm
that the isolation ball valve is closed.
Step 6b: If a Series 746-LPA Dry Accelerator is installed, open
the 1/4-turn vent ball valve.
Step 2a: Isolate the air supply to the system.
Step 3:
Open the system main drain valve. Confirm that the system is drained.
Step 7:
Confirm that the alarm test ball valve is closed.
Step 3a: Push in the ball drip plunger to release pressure.
Step 4:
Step 8:
Close the system main drain valve.
Follow steps 4 - 15 of the “Initial System Setup” section.
Step 5:
Confirm that all system drains are shut and that the system is free
from leaks.
Ball Drip
Plunger
(Step 3a)
System Main
Drain Valve
(Steps 3 & 4)
Water Supply
Main Control
Valve
(Step 2)
Charge Line
Ball Valve
(Step 1)
Alarm Test
Ball Valve
(Step 7)
REV_C
I-768N_15
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
SECTION III
•
•
Weekly External Inspection
Monthly External Inspection
WARNING
• The building owner or their representative is responsible for maintaining the
fire protection system in proper operating ­condition.
• To ensure proper system operation, valves must be inspected in accordance
with current NFPA-25 requirements or in accordance with the requirements
of the local authority having jurisdiction (whichever is more stringent).
Always refer to the instructions in this manual for additional inspection and
testing requirements.
• The frequency of inspections must be increased in the presence of
contaminated water supplies, corrosive/scaling water supplies, and corrosive
atmospheres.
Failure to follow these instructions could cause system failure, resulting in
death or serious personal injury and property damage.
I-768N_16
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
WEEKLY EXTERNAL INSPECTION
5.
CAUTION
• Perform a visual inspection of the valve and trim on a weekly
basis.
• If the dry system is equipped with a low-pressure alarm, monthly
inspections may be sufficient. Contact the local authority having
jurisdiction for specific requirements.
Failure to perform weekly inspections may result in damage to the
valve and trim.
MONTHLY EXTERNAL INSPECTION
1.
Record the system air pressure and water supply pressure.
Confirm that the water supply pressure is within the range of
normal pressures observed in the area. Significant loss of water
supply pressure could indicate an adverse condition in the water
supply. Confirm the proper water-to-air ratio is being maintained.
2.
Confirm that there is no leakage from the intermediate valve
chamber. The ball drip on the alarm manifold assembly should not
be leaking water or air.
3.
Inspect the valve and trim for mechanical damage and corrosion.
Replace any damaged or corroded parts.
4.
Confirm that the dry valve and trim are located in an area that is
not subject to freezing temperatures.
Confirm that all valves are in their normal operating positions (refer
to the table below).
Valve
Normal Operating Position
Water Supply Main Control Valve
Open
Water Supply Main Drain Valve
Closed
System Main Drain Valve
Closed
Charge Line Ball Valve of the Priming Manifold Assembly
Open
Alarm Test Ball Valve of the Priming Manifold Assembly
Closed
Isolation Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Open
1/4-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Closed
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable)
Open
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable)
Closed
6.
If a Series 746-LPA Dry Accelerator is installed, record the
pressure in the air chamber of the dry accelerator. The pressure
in the air chamber should equal the system air pressure within the
allowable tolerances of the gauges. If the air chamber’s pressure
is below the system air pressure, follow the “Troubleshooting”
­section.
Ball Drip
(Step 2)
REV_C
I-768N_17
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
SECTION IV
• Required Main Drain Test
• Required Water Flow Alarm Test
• Required Water Level and Low-
Air Alarm Tests
• Required Partial Operational Trip Test
• Required Full Operational Trip Test
WARNING
• The building owner or their representative is responsible for maintaining the
fire protection system in proper operating ­condition.
• To ensure proper system operation, valves must be inspected in accordance
with current NFPA-25 requirements or in accordance with the requirements
of the local authority having jurisdiction (whichever is more stringent).
Always refer to the instructions in this manual for additional inspection and
testing requirements.
• The frequency of inspections must be increased in the presence of
contaminated water supplies, corrosive/scaling water supplies, and corrosive
atmospheres.
• Any activities that require taking the valve out of service may eliminate
the fire protection provided. A fire patrol is strongly recommended for the
affected areas.
• Before servicing or testing the system, notify the authority having
jurisdiction.
Failure to follow these instructions could cause system failure, resulting in
death or serious personal injury and property damage.
NOTICE
• When the valve is reset after an operational test (or after any system
operation), the main drain valve and any low-point drain valves should be
partially opened and then closed to drain water that might be present in the
riser. Continue this procedure until all water is released.
• The optional Series 75D Water Column Kit can be installed to automate
this step.
I-768N_18
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REQUIRED MAIN DRAIN TEST
Perform the main drain test on a frequency required by the current
NFPA-25 code. The authority having jurisdiction in the area may require
these tests on a more frequent basis. Verify these requirements by
­contacting the authority having jurisdiction in the affected area.
1.
Notify the authority having jurisdiction, remote station alarm
monitors, and those in the affected area that the main drain test
will be p
­ erformed.
2.
Confirm that sufficient drainage is available.
3.
Record the water supply pressure and system air pressure.
4.
Confirm that there is no leakage from the intermediate valve
­chamber. The ball drip on the alarm manifold assembly should not
be leaking water or air.
5.
Verify that the system is at the proper air pressure for the local
water supply pressure.
CAUTION
• Use caution to prevent opening the system main drain valve
accidentally.
• Opening the system main drain valve will cause the valve to
operate.
Failure to pipe the system main drain valve to a proper wastewater
drain will result in property damage.
6.
Open the water supply main drain valve fully to flush the water
supply of any contaminants.
7.
While the water supply main drain valve is fully open, record
the water supply pressure (from the water supply gauge) as the
r­esidual pressure.
8.
Close the water supply main drain valve slowly.
9.
Record the water pressure established after closing the water
s­ upply main drain valve.
10. Compare the residual pressure reading to the residual pressure
readings taken in previous main drain tests. If there is degradation
in the residual water supply reading, restore the proper water
supply pressure.
11. Confirm that all valves are in their normal operating positions (refer
to the table below).
Valve
Normal Operating Position
Water Supply Main Control Valve
Open
Water Supply Main Drain Valve
Closed
System Main Drain Valve
Closed
Charge Line Ball Valve of the Priming Manifold Assembly
Open
Alarm Test Ball Valve of the Priming Manifold Assembly
Closed
Isolation Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Open
1/4-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Closed
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable)
Open
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable)
Closed
12. Confirm that there is no leakage from the intermediate valve
­chamber. The ball drip on the alarm manifold assembly should not
be leaking water or air.
13. Notify the authority having jurisdiction, remote station alarm
­monitors, and those in the affected area that the valve is back in
service. Provide test results to the authority having jurisdiction, if
required.
Ball Drip
(Step 4)
Water Supply
Main Drain
Valve
(Steps 6 & 8)
REV_C
I-768N_19
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REQUIRED WATER FLOW ALARM TEST
4.
Open the alarm test ball valve. Confirm that mechanical and
electrical alarms are activated and that remote monitoring stations,
if provided, receive an alarm s­ ignal.
5.
Close the alarm test ball valve after verifying proper operation of all
alarms.
6.
Push in the ball drip plunger on the alarm manifold assembly to
verify that there is no pressure in the alarm line.
7.
Verify that all alarms stopped sounding, that the alarm line drained
properly, and that remote station alarms reset properly.
• Use caution to prevent opening the system main drain valve
accidentally.
8.
Confirm that the ball drip on the alarm manifold assembly is not
leaking water or air.
• Opening the system main drain valve will cause the valve to
operate.
9.
Notify the authority having jurisdiction, remote station alarm
­ onitors, and those in the affected area that the valve is back in
m
service. Provide test results to the authority having jurisdiction, if
required.
Perform the water flow alarm test on a frequency required by the
­current NFPA-25 code. The authority having jurisdiction in the area may
require these tests on a more frequent basis. Verify these requirements
by contacting the authority having jurisdiction in the affected area.
1.
Notify the authority having jurisdiction, remote station alarm
­monitors, and those in the affected area that the water flow alarm
test will be performed.
CAUTION
Failure to pipe the system main drain valve to a proper wastewater
drain will result in property damage.
2.
Open the water supply main drain valve fully to flush the water
supply of any contaminants.
3.
Close the water supply main drain valve.
Ball Drip
Plunger
(Steps 6 & 8)
Alarm Test
Ball Valve
(Steps 4 & 5)
I-768N_20
Water Supply
Main Drain
Valve
(Steps 2 & 3)
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REQUIRED WATER LEVEL AND LOW AIR ALARM
TESTS
Perform the water level and low air alarm tests on a frequency required
by the current NFPA-25 code. The authority having jurisdiction in the
area may require these tests on a more frequent basis. Verify these
requirements by contacting the authority having jurisdiction in the
affected area.
NOTICE
• If a Series 746-LPA Dry Accelerator is installed, ensure that the
authority having jurisdiction is notified that the water level and
low air alarm tests are in progress. Failure to close the isolation
ball valve of the Series 746-LPA Dry Accelerator may cause the
valve to trip, resulting in a false alarm.
1.
Notify the authority having jurisdiction, remote station alarm
­monitors, and those in the affected area that the water level and
low air alarm tests will be performed.
13. If a Series 746-LPA Dry Accelerator is installed, open the
isolation ball valve.
14. Open the water supply main drain valve.
CAUTION
• Take precautions when opening the water supply main control
valve, since water will flow from all open system valves.
Failure to follow this instruction could result in property damage.
15. Open the water supply main control valve slowly until water flows
steadily from the open water supply main drain valve.
16. Close the water supply main drain valve when a steady flow of
water occurs.
17. Open the water supply main control valve fully.
18. Confirm that all valves are in their normal operating positions (refer
to the table below).
2.
If a Series 746-LPA Dry Accelerator is installed, close the
isolation ball valve.
3.
Open the water supply main drain valve fully to flush the water
supply of any contaminants.
Water Supply Main Control Valve
Open
4.
Close the water supply main drain valve.
Water Supply Main Drain Valve
Closed
5.
Close the water supply main control valve.
System Main Drain Valve
Closed
6.
Partially open the system main drain valve slowly. Confirm that
water is not flowing from the drain. NOTE: If water is flowing from
the drain, the system may not have drained properly. In this case,
follow all steps in the “Resetting the System” section.
Charge Line Ball Valve of the Priming Manifold Assembly
Open
Alarm Test Ball Valve of the Priming Manifold Assembly
Closed
Isolation Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Open
7.
Record the system air pressure at which the low air alarm
a­ ctivates.
1/4-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator
(if ­applicable)
Closed
8.
Close the system main drain valve.
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable)
Open
9.
Close the slow-fill ball valve on the AMTA (if equipped).
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable)
Closed
10. Open the fast-fill ball valve on the AMTA. Bring the pressure back
up to the normal system pressure.
11. When the normal system air pressure is reached, close the fast-fill
ball valve on the AMTA.
Valve
Normal Operating Position
19. Notify the authority having jurisdiction, remote station alarm
­monitors, and those in the affected area that the valve is back in
service. Provide test results to the authority having jurisdiction, if
required.
12. Open the slow-fill ball valve on the AMTA.
System Main
Drain Valve
(Steps 6 & 8)
Water
Supply
Main
Control
Valve
(Steps 5,
15, & 17)
Water Supply
Main Drain
Valve
(Steps 3, 4,
14, & 16)
REV_C
I-768N_21
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REQUIRED PARTIAL OPERATIONAL TRIP TEST
Partial operational (trip) tests are required to confirm proper valve
operation; however, this test does not confirm full system operation.
Victaulic recommends performing the partial operational (trip) test
annually (at minimum). NOTE: The frequency of the partial operational
(trip) test must be increased in the presence of contaminated water
supplies, c­ orrosive/scaling water supplies, and corrosive atmospheres.
In addition, the authority having jurisdiction in the area may require
partial operational (trip) tests on a more frequent basis. Verify these
requirements by contacting the authority having jurisdiction in the
affected area.
1.
Notify the authority having jurisdiction, remote station alarm
­monitors, and those in the affected area that the partial operational
(trip) test will be performed.
6.
Close the water supply main drain valve.
7.
Open the remote system test valve (inspector’s test connection) or
the system main drain valve to simulate an open sprinkler.
8.
Record the system air pressure when the valve operates, along with
any other information required by the authority having jurisdiction.
9.
Confirm that the charge line’s pressure drops to zero and that water
is flowing through the auto drain to the drip cup.
10. Close the water supply main control valve fully.
11. Close the remote system test valve (inspector’s test connection) or
the system main drain valve.
12. SHUT OFF THE AIR SUPPLY.
2.
Record the water supply pressure and system air pressure.
13. Close the charge line ball valve.
3.
Open the water supply main drain valve fully to flush the water
supply of any contaminants.
14. Perform all steps in the “Resetting the System” section.
4.
Close the water supply main control valve to the point where
­additional closure will not provide flow through the water supply
main drain valve.
5.
Open the water supply main control valve slowly until a small
amount of water flows through the water supply main drain valve.
System Main
Drain Valve
(Steps 7 & 11)
Water
Supply
Main
Control
Valve
(Steps 4,
5, & 10)
Water Supply
Main Drain
Valve
(Steps 3 & 6)
Charge Line
Ball Valve
(Step 13)
I-768N_22
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REQUIRED FULL OPERATIONAL TRIP TEST
Victaulic recommends the full operational (trip) test every 3 years (at
minimum). NOTE: The frequency of the full operational (trip) test must
be increased in the presence of contaminated water supplies, corrosive/
scaling water supplies, and corrosive atmospheres. This test allows a
full flow of water into the sprinkler system; therefore, this test must be
performed when there is no chance for freezing conditions. In addition,
the authority having jurisdiction in the area may require full operational
(trip) tests on a more frequent basis. Verify these requirements by
contacting the authority having jurisdiction in the affected area.
1.
Notify the authority having jurisdiction, remote station alarm
monitors, and those in the affected area that the full operational
(trip) test will be performed.
6.
Record the following:
6a. Time between opening the remote system test valve
(inspector’s test connection) and operation of the dry valve
6b. System air pressure when the valve operated
6c. The time between opening the remote system test valve
(inspector’s test connection) to when water flows from the test
connection’s outlet
6d. All information required by the authority having jurisdiction
7.
Confirm that all alarms operate properly.
8.
Continue to run water until it is clear.
Record the water supply pressure and system air pressure.
9.
Close the water supply main control valve.
3.
Open the water supply main drain valve fully to flush the water
supply of any contaminants.
10. Close the charge line ball valve.
4.
Close the water supply main drain valve.
12. Open the system main drain valve to drain the system.
5.
Open the remote system test valve (inspector’s test connection) to
simulate the operation of a sprinkler.
13. After the system is properly drained, close the remote system test
valve (inspector’s test connection).
2.
11. SHUT OFF THE AIR SUPPLY.
14. Close the system main drain valve.
15. Perform all steps in the “Resetting the System” section.
Water
Supply
Main
Control
Valve
(Step 9)
System Main
Drain Valve
(Steps 12 & 14)
Charge
Line Ball
Valve
(Step 10)
REV_C
Water
Supply
Main
Drain Valve
(Steps 3 & 4)
I-768N_23
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
SECTION V
•
Required Internal Inspection
WARNING
• Depressurize and drain the piping system before attempting to remove the
cover plate from the valve.
• The building owner or their representative is responsible for maintaining the
fire protection system in proper operating condition.
• To ensure proper system operation, valves must be inspected in accordance
with current NFPA-25 requirements or in accordance with the requirements
of the local authority having jurisdiction (whichever is more stringent).
Always refer to the instructions in this manual for additional inspection and
testing requirements.
• The frequency of inspections must be increased in the presence of
contaminated water supplies, corrosive/scaling water supplies, and corrosive
atmospheres.
• Any activities that require taking the valve out of service may eliminate
the fire protection provided. A fire patrol is strongly recommended for the
affected areas.
• Before servicing or testing the system, notify the authority having
jurisdiction.
Failure to follow these instructions could cause system failure, resulting in
death or serious personal injury and property damage.
I-768N_24
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REQUIRED INTERNAL INSPECTION
Latch
Inspect internal components at the frequency required by the current
NFPA-25 code. The authority having jurisdiction in the area may require
these inspections on a more frequent basis. Verify these requirements
by contacting the authority having jurisdiction in the affected area.
1.
Notify the authority having jurisdiction, remote station alarm
monitors, and those in the affected area that the system is being
taken out of service.
2.
Open the water supply main drain valve fully to flush the water
supply of any contaminants.
3.
Close the water supply main drain valve.
4.
Close the water supply main control valve to take the system out of
service.
5.
Open the water supply main drain valve.
6.
Confirm that water is not flowing from the water supply main drain
valve.
7.
Close the charge line ball valve.
8.
Open the system main drain valve to drain any water that has
accumulated and to release system air pressure.
13. Push the latch back (toward the diaphragm).
CAUTION
NOTE: If the system has operated, open the remote system test valve (inspector’s test connection) and any auxiliary drain valves.
• DO NOT use solvents or abrasives on or near the valve body seat
ring.
9.
Failure to follow this instruction could prevent the clapper from
sealing, resulting in valve leakage.
Close the slow-fill ball valve on the AMTA.
10. PUSH DOWN ON THE AUTO DRAIN SCREW TO REMOVE
PRESSURE IN THE CHARGE LINE. VERIFY THAT THERE IS NO
PRESSURE ON THE GAUGES.
WARNING
• Ensure that the valve is depressurized and drained completely
before the cover plate bolts are removed.
Failure to follow this instruction could result in death or serious
personal injury and property damage.
14. Rotate the clapper out of the valve body. Inspect the clapper seal
and seal-retaining ring. Wipe away any contaminants, dirt, and
mineral deposits. Clean out any holes that are plugged in the
valve-body seat ring. DO NOT USE SOLVENTS OR ABRASIVES.
15. While the clapper is rotated out of the valve body, pull the latch
forward to inspect the diaphragm. If the diaphragm shows any
signs of wear or damage, replace it with a new, Victaulic-supplied
diaphragm. Refer to the “Removing and Replacing the Diaphragm”
section.
11. After all pressure is released from the system, loosen the cover
plate bolts slowly. NOTE: DO NOT remove any cover plate bolts
until all cover plate bolts are loosened.
16. Inspect the clapper for freedom of movement and physical
damage. Replace any damaged or worn parts by following the
applicable instructions in Section VI.
12. Remove all cover plate bolts, along with the cover plate and cover
plate gasket. NOTE: The 1 1/2-inch/48.3-mm and 2-inch/60.3-mm
valve sizes contain washers under the heads of the cover plate
bolts. Keep these washers for re-installation.
17. Re-install the cover plate by following the “Installing the Cover
Plate Gasket and Cover Plate” section.
REV_C
18. Place the system back in service by following the “Resetting the
System” section.
I-768N_25
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
SECTION VI
• Removing and Replacing the Clapper Seal
• Removing and Replacing the Clapper Assembly
• Installing the Cover Plate
Gasket and Cover Plate
• Removing and Replacing the Diaphragm
• Cleaning the Cartridge in the Air and Priming Manifold
Assemblies
• Replacing the Filter in
Series 776 Low-Pressure Actuators
WARNING
• Before servicing or testing the system, notify the authority having
jurisdiction.
• Depressurize and drain the piping system before attempting to remove the
cover plate from the valve.
• The building owner or their representative is responsible for maintaining the
fire protection system in proper operating ­condition.
• To ensure proper system operation, valves must be inspected in accordance
with current NFPA-25 requirements or in accordance with the requirements
of the local authority having jurisdiction (whichever is more stringent).
Always refer to the instructions in this manual for additional inspection and
testing requirements.
• The frequency of inspections must be increased in the presence of
contaminated water supplies, corrosive/scaling water supplies, and corrosive
atmospheres.
• Any activities that require taking the valve out of service may eliminate
the fire protection provided. A fire patrol is strongly recommended for the
affected areas.
Failure to follow these instructions could cause system failure, resulting in
death or serious personal injury and property damage.
I-768N_26
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REMOVING AND REPLACING THE CLAPPER
SEAL
1.
Perform steps 1 – 13 of the “Required Internal Inspection” section.
2.
Remove the seal assembly bolt/bolt seal from the clapper seal.
CAUTION
• Use only Victaulic-supplied replacement parts.
Failure to follow this instruction could cause improper valve
operation, resulting in property damage.
6.
3.
Pry the clapper seal, along with the seal ring, out of the clapper.
Inspect the clapper seal. If the clapper seal is torn or worn, replace
it with a new, Victaulic-supplied clapper seal. If replacing the
­clapper seal assembly with a new assembly, skip to step 7.
Remove the seal-retaining ring. Save the seal-retaining ring for
re-installation.
CAUTION
• DO NOT pry the seal washer out of the clapper seal from the
inner hole.
Failure to follow this instruction could damage the seal washer,
resulting in improper clapper sealing and valve leakage.
4.
Pry the edge of the seal washer from inside the clapper seal, as
shown above. DO NOT PRY THE SEAL WASHER OUT FROM
THE INNER HOLE.
5.
Remove the seal washer from the clapper seal. Dry up any
moisture under the seal washer or on the clapper seal.
REV_C
6a. If using the same clapper seal assembly and the seal ring was
removed from the clapper seal in the previous step: Re-insert the
seal ring carefully underneath the outer lip of the clapper seal.
Ensure that the smaller diameter of the seal ring is toward the
­sealing surface of the clapper seal.
7.
Insert the seal washer carefully underneath the sealing lip of the
gasket.
8.
Remove any debris from the clapper. Inspect the clapper for
damage that may affect the sealing capabilities of the new clapper
seal. Contact Victaulic of the clapper requires replacement.
I-768N_27
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REQUIRED SEAL ASSEMBLY BOLT/BOLT SEAL TORQUES
Nominal Size
inches or mm
Required Torque
inch-lbs/N•m
1 1/2
40
5
2
40
5
90
10
2 1/2
9.
Install the clapper seal into the clapper carefully. Ensure that the
seal ring snaps into the clapper completely.
76.1 mm
90
10
3
90
10
4
110
12
165.1 mm
160
18
6
160
18
160
18
8
12. Replace the cover plate by following the “Installing the Cover Plate
Gasket and Cover Plate” section.
13. Place the system back in service by following the “Resetting the
System” section.
REMOVING AND REPLACING THE CLAPPER
ASSEMBLY
1.
Perform steps 1 – 13 of the “Required Internal Inspection” section.
2.
Remove the clapper shaft bushings with o-rings from the valve
body.
3.
Remove the clapper shaft. NOTE: As the shaft is being removed,
the clapper spring will drop out of position. Save the clapper spring
for re-installation.
10. Place the seal-retaining ring onto the seal washer of the clapper
seal. Install the seal assembly bolt/bolt seal through the sealretaining ring and clapper.
11. Tighten the seal assembly bolt/bolt seal to the torque value listed
in the table on this page to ensure a proper seal.
I-768N_28
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
4.
Remove the clapper assembly from the valve body seat ring. Clean
the valve body seat ring.
CAUTION
9.
• Use only Victaulic-supplied replacement parts.
Failure to follow this instruction could cause improper valve
operation, resulting in property damage.
Ensure that a clapper shaft bushing o-ring is installed on each
clapper shaft bushing.
9a. Apply thread sealant to each clapper shaft bushing. Install the
­clapper shaft bushings into the valve body until hand-tight.
9b. Tighten the clapper shaft bushings until metal-to-metal contact
occurs with the valve body. DO NOT exceed 10 ft-lbs/14 N•m of
torque on the clapper shaft bushings.
9c. Check the clapper for freedom of movement.
10. Replace the cover plate by following the “Installing the Cover Plate
Gasket and Cover Plate” section.
11. Place the system back in service by following the “Resetting the
System” section.
INSTALLING THE COVER PLATE GASKET AND
COVER PLATE
CAUTION
• Use only Victaulic-supplied replacement parts.
5.
Place the new clapper assembly onto the valve body seat ring.
Ensure that the holes in the clapper arms align with the holes in
the valve body.
6.
Insert the clapper shaft halfway into the valve body.
7.
Install the clapper spring onto the clapper shaft. Ensure that the
loop of the clapper spring is facing the clapper, as shown above.
8.
Finish inserting the clapper shaft through the clapper arm and
valve body.
REV_C
Failure to follow this instruction could cause improper valve
operation, resulting in property damage.
1.
Verify that the cover plate gasket is in good condition. If the gasket
is torn or worn, replace it with a new, Victaulic-supplied gasket.
2.
Align the holes of the cover plate gasket with the holes in the cover
plate.
3.
Insert one cover plate bolt through the cover plate and cover plate
gasket to ease alignment. NOTE: For 1 1/2-inch/48.3-mm and
2-inch/60.3-mm valve sizes, a washer must be re-installed under
the head of each cover plate bolt.
I-768N_29
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
REMOVING AND REPLACING THE DIAPHRAGM
CAUTION
• DO NOT over-tighten the cover plate bolts.
Failure to follow this instruction could cause damage to the cover
plate gasket, resulting in valve leakage.
4.
Align the cover plate/cover plate gasket to the valve. Ensure that
the clapper spring’s arms are rotated to their installed position.
Tighten all cover plate bolts into the cover plate/valve body.
5.
Torque all cover plate bolts in an even, crossing pattern. Refer
to the “Required Cover Plate Bolt Torques” table below for the
required torque values. DO NOT over-tighten the cover plate bolts.
1.
Remove the system from service by following steps 1 – 10 of the
“Required Internal Inspection” section.
2.
Break the unions that connect the trim to the diaphragm cover.
Refer to the applicable trim drawing for details.
3.
Remove the cap screws from the diaphragm cover, and pull the
diaphragm cover/trim off the valve.
4.
Remove the diaphragm from the valve body. Discard the
diaphragm.
5.
Clean the back of the valve body to remove any debris that may
interfere with proper diaphragm seating.
REQUIRED COVER PLATE BOLT TORQUES
6.
Nominal Size
inches or mm
Required Torque
ft-lbs/N•m
1 1/2
30
41
2
30
41
2 1/2
60
81
76.1 mm
60
81
3
60
81
4
100
136
165.1 mm
115
156
6
115
156
8
100
136
Place the system back in service by following the “Resetting the
System” section.
5a. Clean the inside of the diaphragm cover.
CAUTION
• Use caution when installing a new diaphragm into the valve
body.
Failure to follow this instruction could cause damage to the
­diaphragm, resulting in improper valve operation and valve leakage.
I-768N_30
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
6.
Replace the diaphragm with a new, Victaulic-supplied diaphragm.
Align the holes in the diaphragm with the holes in the valve
body. Use caution to prevent damage to the diaphragm during
installation.
7.
Align the holes of the diaphragm cover with the holes in the
diaphragm/valve body. Tighten all cap screws into the diaphragm
cover/valve body in an even, crossing pattern to a torque of
10 ft-lbs/14 N•m. Repeat this tightening sequence to verify that all
cap screws have been torqued to 10 ft-lbs/14 N•m.
8.
Re-attach the trim at the unions that were loosened in step 2.
Refer to the applicable trim drawing for details. VERIFY THAT
ALL UNIONS THAT WERE LOOSENED TO PERMIT ACCESS TO
THE DIAPHRAGM COVER HAVE BEEN RE-TIGHTENED BEFORE
ATTEMPTING TO PLACE THE SYSTEM BACK IN SERVICE.
9.
Place the system back in service by following the “Resetting the
System” section. Inspect all trim components to confirm that
there are no leaks. Any leaks must be corrected immediately
by depressurizing the system and tightening any affected
components.
REPLACING THE FILTER IN SERIES 776
LOW-PRESSURE ACTUATORS
1.
Remove the system from service by following steps 1 – 10 of the
“Required Internal Inspection” section.
2.
Remove the Series 776 Low-Pressure Actuator from the trim. Refer
to the applicable trim drawing for details.
3.
Remove and discard the filter.
CLEANING THE CARTRIDGE IN THE AIR AND
PRIMING MANIFOLD ASSEMBLIES
1.
Remove the system from service by following steps 1 – 10 of the
“Required Internal Inspection” section.
CAUTION
• DO NOT re-use filters. After removal, the old filter must be
replaced with a new, Victaulic-supplied filter.
Failure to follow this instruction could cause improper valve
operation, resulting in property damage.
2.
Remove the existing cartridge from the air manifold and priming
manifold assemblies, shown above. Rinse the cartridges to remove
any deposits.
3.
Install the corresponding cartridge into the air manifold and
priming manifold assemblies. NOTE: The face of the air manifold
cartridge is stamped “AM” and the face of the priming manifold
cartridge is stamped “PM.” These cartridges are designed so that
they cannot be interchanged.
4.
Place the system back in service by following the “Resetting the
System” section.
REV_C
4.
Use only a new, Victaulic-supplied filter. Install the new filter
onto the filter adapter, as shown above. Make sure the o-ring is
positioned on the filter adapter, as shown above.
5.
Carefully re-install the filter adapter into the actuator. Use caution
to prevent damage to the o-ring.
6.
Re-install the actuator into the trim. Refer to the applicable trim
drawing for details.
I-768N_31
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
SECTION VII
•Troubleshooting
I-768N_32
REV_C
I-768N / Series 768N FireLock NXT™ Dry Valve / Installation, Maintenance, and Testing Manual
TROUBLESHOOTING – SYSTEM
Problem
Possible Cause
Solution
The valve operates without sprinkler activation.
There is a loss of air pressure in the system or trim.
Check for any leaks in the system and trim. Confirm that the AMTA is
operating properly. Consider installing a low-air supervisory switch.
The pressure switch on the air compressor is set too low, or the compressor
is not operating properly.
Increase the “ON” setting of the air compressor’s pressure switch, and check
the air compressor for proper operation.
Water is getting past the clapper seal and into the intermediate chamber
of the valve.
Check the clapper seal and valve body seat ring for physical damage and
foreign material.
Water is under the clapper seal.
Inspect the clapper seal to ensure that no water is under the seal. If water is
present, remove and replace the seal. Refer to the “Removing and Replacing
the Clapper Seal” section.
Air is getting past the clapper seal and into the intermediate chamber of
the valve.
Check the clapper seal and valve body seat ring for physical damage and
foreign material.
Water is under the clapper seal.
Inspect the clapper seal to ensure that no water is under the seal. If water is
present, remove and replace the seal. Refer to the “Removing and Replacing
the Clapper Seal” section.
There is no water pressure on the diaphragm.
Check the water pressure in the charge line. Ensure that the restrictor in the
charge line is clean.
Water is leaking from the ball drip on the alarm manifold
assembly.
Air is leaking from the ball drip on the alarm manifold assembly.
The clapper will not latch closed.
The auto drain is not set.
Set the auto drain by pulling up on the auto drain sleeve.
Water is leaking from the diaphragm assembly.
The diaphragm is damaged.
Contact Victaulic.
Air is leaking from the diaphragm assembly.
The diaphragm is damaged.
Contact Victaulic.
TROUBLESHOOTING – SERIES 776 LOW-PRESSURE ACTUATOR
Problem
Possible Cause
Solution
When air in the system is released, the Series 776 Low-Pressure
Actuator does not trip.
There is a restriction in the piping between the air manifold and the auto
vent of the Series 776 Low-Pressure Actuator.
Remove the air feed nipple and remove any debris. Clean the restrictor
and strainer in the air manifold. Verify that no debris has built up in the air
manifold ports that could be restricting airflow.
When the Auto Vent Sleeve of the Series 776 Low-Pressure
Actuator is pulled up, the screw does not stay set in the “UP”
position.
The Series 776 Low-Pressure Actuator is not receiving enough air.
Increase the air pressure going into the Series 776 Low-Pressure Actuator.
The Series 776 Low-Pressure Actuator has a broken seal.
If the above procedure does not work, contact Victaulic.
Water is leaking through the Series 776 Low-Pressure Actuator.
The air chamber of the Series 776 Low-Pressure Actuator is not set.
Ensure that the vent seal of the Series 776 Low-Pressure Actuator is in the
set position and the air chamber is pressurized.
The strainer on the Series 776 Low-Pressure Actuator is clogged.
Replace the strainer screen of the Series 776 Low-Pressure Actuator. Refer to
the “Replacing the Filter in Series 776 Low-Pressure Actuators” section.
The Series 776 Low-Pressure Actuator has a ripped diaphragm.
If water still leaks through the Series 776 after performing the above
procedures, contact Victaulic.
The strainer in the priming manifold is clogged.
Disassemble and clean the priming manifold strainer. Refer to the “Cleaning
the Cartridge in the Air and Priming Manifold Assemblies” section.
No water is passing through the Series 776 Low-Pressure Actuator.
TROUBLESHOOTING – SERIES 746-LPA DRY ACCELERATOR
Problem
Possible Cause
Solution
The valve operates without sprinkler activation.
There is a loss of air pressure in the lower inlet chamber of the Series
746-LPA Dry Accelerator.
Check for air loss at the lower chamber seal. If a leak is present, turn the
adjustment nut counterclockwise to seal.
Check for any leaks in the system and trim. Confirm that the AMTA is
operating properly.
The Series 746-LPA Dry Accelerator does not operate within a
0.3-Bar/5-psi pressure drop in system air pressure.
There is a loss of air pressure in the upper air chamber of the Series 746-LPA Apply soapy water to all joints around the Series 746-LPA Dry ­Accelerator
Dry Accelerator.
to check for leaks. Repair any leaks and re-test.
The air decay rate of the system is too slow.
Make sure there are no restrictions in the remote system test valve
(inspector’s test connection).
If the above procedures do not work, contact Victaulic.
The Series 746-LPA Dry Accelerator does not set up properly
(cannot get pressure on the upper gauge, and the button pops up
immediately when pressure is introduced).
REV_C
The Series 746-LPA Dry Accelerator is installed upside-down.
Remove the Series 746-LPA Dry Accelerator from the trim. Turn the unit
around so that the vent seal “button” is facing down (toward the actuator).
I-768N_33
INSTALLATION, MAINTENANCE, AND TESTING MANUAL
Series 768N FireLock NXT™ Dry Valve
Victaulic Company
4901 Kesslersville Road
US 18040 Easton, Pennsylvania
Phone: 001-610-559-3300
Fax: 001-610-250-8817
Dry Pipe Alarm Valve Stations
Approval no.:
G4080027
Name of product:
“NXT S 768” DN 40 mit und ohne Schnellöffner “S 746 LPA”
Approval no.:
G4080026
Name of product:
“Series 768N FireLock NXT” DN 50 mit und ohne Schnellöffner “S 746 LPA”
Approval no.:
G4070047
Name of product:
“Series 768N FireLock NXT” DN 65 mit und ohne Schnellöffner “S 746 LPA”
Approval no.:
G4070036
Name of product:
“NXT S 768” DN 80 mit und ohne Schnellöffner “S 746 LPA”
Approval no.:
G4070037
Name of product:
“NXT S 768” DN 100 mit und ohne Schnellöffner “S 746 LPA”
Approval no.:
G4070038
Name of product:
“NXT S 768” DN 150 mit und ohne Schnellöffner “S 746 LPA”
Approval no.:
G4070039
Name of product:
“NXT S 768” DN 200 mit und ohne Schnellöffner “S 746 LPA”
For complete contact information, visit victaulic.com
I-768N
8918 REV C
UPDATED 08/2016
Z000768N00
VICTAULIC AND FIRELOCK NXT ARE REGISTERED TRADEMARKS OR TRADEMARKS OF VICTAULIC COMPANY AND/OR ITS AFFILIATED ENTITIES
IN THE UNITED STATES AND/OR OTHER COUNTRIES.
© 2016 VICTAULIC COMPANY.
ALL RIGHTS RESERVED.
I-768N
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising