Nitrogen / Air Maintenance Device for Fire Sprinkler Systems
Model
NAMD-1
UNITED
Fire Systems
Division of United Fire Protection Corporation
1 MARK ROAD
KENILWORTH, NJ 07033 USA
PHONE: 908-688-0300 FAX: 908-688-0218
UFS-710 P/N 31-100013-002 Rev. 1.04 Aug 2020
INSTRUCTION SHEET
Page 2 of 4
This document is provided for informational purposes only. UNITED Fire Systems assumes no responsibility
for the product’s suitability for a particular application. The product must be properly applied to perform as
intended. The information in this document is believed to be correct at the time of publication. UNITED Fire
Systems reserves the right to add to, delete, or revise any information in this document without notice.
1. INSTALLATION
INSTRUCTIONS
– READ AND UNDERSTAND BEFORE INSTALLATION
1.1. Install the
Model
NAMD-1
device in the nitrogen / air pressure supply line to the sprinkler valve trim.
1.2.
UNITED
Fire Systems
highly recommends installing one (1)
Model NAMD-1
device for each sprinkler valve.
1.3. The device may be installed in any orientation.
1.4. Install the device as close as possible to the sprinkler valve receiving the pressure.
1.5. Locate the device in as a convenient place as possible, where the ball valves may be easily operated and the pressure
gauge observed.
1.6. If the rigidity of the inlet and outlet piping is sufficient, no additional bracketing should be necessary. Otherwise, use
standard split ring hangers and hardware to attach the device to the wall or other solid mounting location.
1.7. Attach the piping from the pressure source to the
INLET
of the device.
Piping shall be 1/2” nominal pipe size minimum.
Use Teflon tape on the male 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.
2. COMMISSIONING
2.1. Ensure all three (3) ball valves on the
Model NAMD-1
device are
CLOSED
.
2.2. Determine proper supervisory pressure for the sprinkler valve which the device is connected to.
2.3. Pull pressure regulator adjustment knob UP.
2.4. Turn pressure regulator adjustment knob COUNTERCLOCKWISE to remove all force from the regulating spring.
2.5. Apply nitrogen pressure from sprinkler corrosion inhibiting system to the device inlet.
2.6. Leak check the piping from the pressure source to the Model NAMD-1 device. Piping should be as leak-free as possible.
Correct all leaks before proceeding.
2.7. Gradually open inlet shutoff valve. Pressure gauge on the device pressure regulator should indicate pressure.
IMPORTANT
DO NOT disassemble the
Model NAMD-1
device!
IMPORTANT
The
Model NAMD-1
device is designed to operate in one direction only. Refer to
Figure 1
to positively identify the
INLET
and
OUTLET
ports of the device.
IMPORTANT
When adjusting pressure regulator, always approach the desired adjustment from a LOWER to a HIGHER pressure.
A. If pressure adjustment (as indicated on device pressure gauge) is LOW, turn pressure regulator adjustment knob
CLOCKWISE to increase pressure to desired setting.
B. If pressure adjustment (as indicated on the device pressure gauge) is HIGH, turn pressure regulator adjustment knob
COUNTERCLOCKWISE to reduce pressure 3-5 PSIG below desired setting, then turn knob CLOCKWISE to increase
pressure to desired setting.
APPENDIX B - SC-W MANUAL
Содержание Nitrogen Pac SC-W
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