SPECIFIC APPLICATION
WINDOW SPRINKLERS
(K5.6)
TECHNICAL DATA
Form No. F_042519 21.09.28 Rev 21.3
© 2021 Viking Group Inc. All rights reserved
Page 1 of 10
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com
1. DESCRIPTION
Viking Specific Application window sprinklers are quick response glass bulb,
automatic sprinklers. Both Pendent Vertical Sidewall (VSW) and Horizontal
Sidewall (HSW) versions are available to meet design needs.
The special Polyester and Electroless Nickel PTFE (ENT) coatings can be used
in decorative applications where colors are desired. In addition, these coatings
have been investigated for installation in corrosive environments and are listed/
approved as indicated in the Approval Charts.
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
Evaluation Recognition:
ICC-ES Evaluation Report No. ESR-4288
Refer to the Approval Chart and Design Criteria for listing requirements that must
be followed.
3. TECHNICAL DATA
Minimum Operating Pressure: 7 psi (0.5 bar)
Rated to: 175 PSI (12 bar)
Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 1/2” NPT (15 mm BSPT)
Nominal K-factor: 5.6 U.S. (80.6 metric*)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
* Metric K-factor measurement shown is in Bar. When pressure is measured in kPa, divide the
metric K-factor shown by 10.0.
Material Standards:
Sprinkler Body: Brass CW602N or QM Brass
Deflector: Phosphor Bronze UNS-C51000
Pip Cap Shell - Stainless Steel UNS-S44400
Pip Cap Disc - Stainless Steel UNS-S30100
Belleville Spring - Nickel Alloy
Pip Cap Seal - Polytetrafluoroethylene (PTFE)
Compression Screw: Brass CW612N, CW508L, UNS-C36000 or UNS-C26000
Shipping Cap: Polyethylene
Bulb: Glass, nominal 3 mm diameter
Ordering Information: Refer to Table 1
4. INSTALLATION
Refer to appropriate NFPA Installation Standards. Also refer to Figures 3 through 6.
NOTICE
Risk of permanent damage.
Over-tightening the sprinkler can cause permanent damage.
> Tighten the sprinkler to a MAXIMUM torque of 14 ft-lbs. (19 N-m).
5. OPERATION
During fire conditions, when the temperature around the sprinkler reaches its operating temperature, the heat-sensitive liquid in the
glass bulb expands, causing the bulb to shatter, releasing the pip cap assembly. Water flowing through the sprinkler orifice strikes
the sprinkler deflector, forming a uniform spray pattern to extinguish or control the fire.
6. INSPECTIONS, TESTS AND MAINTENANCE
Refer to NFPA 25 for Inspection, Testing and Maintenance requirements.
7. AVAILABILITY
Viking automatic window sprinklers are available through a network of domestic and international distributors. See The Viking
Corporation web site for the closest distributor or contact The Viking Corporation.
8. GUARANTEE
For details of warranty, refer to Viking’s current list price schedule or contact Viking directly.
SIN
THREAD DESCRIPTION
VK960 NPT
Pendent VSW
VK960 BSPT
Pendent VSW
VK962 NPT
HSW
VK962 BSPT
HSW
Replaces F_042519 Rev 21.2
(Revised sprinkler part numbers)
ICC-ES Evaluation
Report No. ESR-4288
www.icc-es.org
