FREEDOM®RESIDENTIAL
CONCEALED PENDENT
SPRINKLER VK498 (K5.8)
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
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Page 5 of 8
Form No. F_112817 21.12.02 Rev 21.2
APPROVAL CHART
Viking VK498, 5.8 K-Factor Residential Concealed Pendent Sprinkler
For systems designed to NFPA 13D or NFPA 13R. For systems designed to NFPA 13, refer to the design criteria. For Ceiling types refer to
current editions of NFPA 13, 13R or 13D
S p r i n k l e r B a s e
Part Number 1SIN NPT Thread Size Nominal K-factor Maximum Water Wor-
king Pressure
Inches mm U.S. metric 2
23764 VK498 1/2 15 5.8 83.6 175 psi (12 bar)
Max. Coverage
Area 6
Ft. X Ft.
(m X m)
All Temperature Ratings
Deflector
to Ceiling
Installation
Type
Listings and
Approvals3,5 Minimum
Spacing
Ft.
(m)
Flow
GPM (LPM)
Pressure
PSI (bar) cULusEU4
12 X 12
(3.7 X 3.7)
16
(60.6)
7.6
(0.52)
Refer to Figure 4
Concealed with
Cover Plate
Assembly.
See Footnote 7.
See Footnotes 8 and 9 8
(2.4)
14 X 14
(4.3 X 4.3)
16
(60.6)
7.6
(0.52)
16 X 16
(4.9 X 4.9)
16
(60.6)
7.6
(0.52)
18 X 18
(5.5 X 5.5)
17
(64.4)
8.6
(0.59)
20 X 20
(6.1 X 6.1)
20
(75.7)
11.9
(0.82)
Footnotes
1. Part number shown is the base part number. For complete part number, refer to current Viking price schedule.
2. Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
3. This chart shows the listings and approvals available at the time of printing. Other approvals may be in process. Check with the manufacturer for any additional approv-
als. Refer also to Design Criteria.
4. Listed by Underwriter’s Laboratories, Inc. for use in the U.S., Canada, and European Union.
5. Meets New York City requirements, effective July 1, 2008.
6. For areas of coverage smaller than shown, use the “Flow” and “Pressure” for the next larger area listed. Flows and pressures listed are per sprinkler. The distance from
sprinklers to walls shall not exceed one-half the sprinkler spacing indicated for the minimum “Flow” and “Pressure” used.
7. Other paint colors are available on request with the same listings as the standard finish colors. Listings and approvals apply for any paint manufacturer. Contact Viking
for additional information. Custom colors are indicated on a label inside the cover assembly. Refer to Figure 1.
8. Accepted Cover Plate Finishes are: Polished Chrome, Brushed Chrome, Bright Brass, Antique Brass, Brushed Brass, Brushed Copper, Painted White, Painted Ivory, or
Painted Black 9.
9. C-UL-US-EU Listed as corrosion resistant - Electroless Nickel PTFE (ENT)
DESIGN CRITERIA
(Also refer to the Approval Chart above.)
UL Listing Requirements (C-UL-US-EU):
When using Viking Residential Concealed Pendent Sprinkler VK498 for systems designed to NFPA 13D or NFPA 13R, apply the listed areas of cover-
age and minimum water supply requirements shown in the Approval Chart.
For systems designed to NFPA 13: The number of design sprinklers is to be the four contiguous most hydraulically demanding sprinklers. The minimum
required discharge from each of the four sprinklers is to be the greater of the following:
• The flow rates given in the Approval Chart for NFPA 13D and NFPA 13R applications for each listed area of coverage, or
• Calculated based on a minimum discharge of 0.1 gpm/sq. ft. over the “design area” in accordance with sections 8.5.2.1 or 8.6.2.1.2 of NFPA 13.
• Minimum distance between residential sprinklers: 8 ft. (2.4 m).
NOTE: Concealed sprinklers must be installed in neutral or n egative pressure plenums only.
IMPORTANT: Always refer to Bulletin Form No. F_080415 - Best Practices for Residential Sprinkler Handling and Installation. Also refer to
Form No. F_080614 for general care, installation, and maintenance information. Viking sprinklers are to be installed in accordance with the
latest edition of Viking technical data, the appropriate standards of NFPA and any other similar Authorities Having Jurisdiction, and also
with the provisions of governmental codes, ordinances, and standards, whenever applicable. Final approval and acceptance of all residential
sprinkler installations must be obtained from the Authorities Having Jurisdiction.
