UNITED FIRE SYSTEMS -
NITROGEN-
PAC™
MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
54
UNITED
Fire Systems
recommends that the technician performing the commissioning become thoroughly familiar
with this entire manual, as well as the actual installation, before beginning the process.
Follow the steps as indicated.
Each valve in the system is identified by number. Refer to
Figure 34
and
Table 9
for valve locations, numbers, and
purposes. Each valve has a blue flag marker with the number. Look 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 values as indicated and steps followed.
Open and close all valves
carefully
and
slowly
.
Figure 34
Valve Locations and Numbers
Table 9
Valve Numbers and Purposes
Valve Number
Name
NORMAL Position
1
Bypass Valve
OPEN (System Normal
– Handle facing UP)
2
Outlet Valve
OPEN
VALVE
1
- BYPASS VALVE
(INSIDE CABINET)
VALVE
2
– OUTLET VALVE
(OUTSIDE CABINET)
Summary of Contents for Nitrogen Pac SC-W
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