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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 Standard Response Concealed Pendent Sprinkler VK4921 is a small
thermosensitive, glass-bulb sprinkler designed for installation on concealed pipe
systems where the appearance of a smooth ceiling is desired. The low-profile
cover assemblies provide up to ½" (13 mm) of vertical adjustment.
Features:
•
K5.6 (80.6 metric).
•
Standard response glass bulb operating element.
•
Integral threaded adapter cup accepts push-on or thread-on cover plates.
•
Low-profile, small diameter, removeable cover plates offer almost flush
appearance upon installation and allow ease of maintenance.
•
Protective cap prevents damage during installation and finishing and keeps
errant overspray from coating internal parts.
•
Various finishes available to meet design requirements.
•
Optional Electroless Nickel PTFE (ENT) coating provides corrosion resistance
(see Approval Chart).
2.
LISTINGS AND APPROVALS
cULus Listed: Category VNIV
FM Approved: Class 2015
Also approved for use in FM Approved vacuum dry sprinkler systems with
a maximum supervisory vacuum pressure of -3 psi (-207 mbar).
Refer to the Approval Charts and Design Criteria on for cULus Listing requirements that must be followed.
3.
TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)
Maximum Working Pressure: FM - 175 psi (12 bar). UL - 250 psi (17.2 bar)
Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 1/2" NPT or 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:
Deflector: Phosphor Bronze UNS-C51000
Deflector Pins: Stainless Steel UNS-S43000
Pip Cap and Insert Assembly: Copper UNS-C11000, SS UNS-S30400 and SS UNS-S31600
Compression Screw: UNS-C36000
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Cover Adapter: Cold Rolled Steel JIS G3141 and Carbon Steel UNS-G10100 (per JIS G3141)
Shipping Cap: High Density Polyethylene
Cover Plate Materials:
Cover Plate Assembly: Copper UNS-C11000 and Brass UNS-C26800 or Stainless Steel UNS-S30400
Spring: Beryllium Nickel
Solder: Eutectic
Ordering Information: Refer to Tables 1 and 2.
4.
INSTALLATION
Refer to appropriate NFPA Installation Standards and installation instructions in this document.
Form No. F_092221
21.12.02 Rev 21.3
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
STANDARD RESPONSE
CONCEALED PENDENT
SPRINKLER VK4921 (K5.6)
Replaces Form No. F_092221 Rev 21.2
(Updated wrench drive.)
Page 1 of 9
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Summary of Contents for Viking VK4921
- Page 1 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 DESCRIPTION Viking Standard Response Concealed Pendent Sprinkler VK4921 is a small thermosensitive, glass-bulb sprinkler designed for installation on concealed pipe systems where the appearance of a smooth ceiling is desired.
- Page 2 INSPECTIONS, TESTS AND MAINTENANCE Refer to NFPA 25 for Inspection, Testing and Maintenance requirements. AVAILABILITY Viking 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. GUARANTEE For details of warranty, refer to Viking’s current list price schedule or contact Viking directly.
- Page 3 Based on NFPA-13. Other limits may apply, depending on fire loading, sprinkler location, and other requirements of the Authority Having Jurisdiction. Refer to specific installation standards. Part number shown is the base part number. For complete part number, refer to current Viking price list schedule. Stainless Steel versions are not available with any finishes or paint.
- Page 4 The 135 °F (57 °C) [139 °F (59 °C)] covers have an orange label. The 165 °F (74 °C) covers have a white label. Other paint colors are available on request with the same listings as the standard paint colors. Listings and approvals apply for any paint manufacturer. Contact Viking for additional information.
- Page 5 (Also refer to Approval Chart) cULus Listing Requirements: Concealed Pendent Sprinkler VK4921 is cULus Listed as standard response for installation in accordance with the latest edition of NFPA 13 for standard coverage pendent spray sprinklers as indicated below. For hazard occupancies up to and including Ordinary Hazard, Group II.
- Page 6 SPRINKLER VK4921 (K5.6) 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 Installation Wrench Cap Removal Tool...
- Page 7 SPRINKLER VK4921 (K5.6) 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 1/2”NPT or BSPT 21/4”...
- Page 8 USE ONLY the designated sprinkler wrenches shown in this document. Permanent damage to the sprinkler assembly can occur if the proper wrench is not used. Other sprinkler wrenches available from Viking may fit into the sprinkler adapter cup; however, only the wrenches shown here are designed to properly install this sprinkler.
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Page 9: Technical Data
SPRINKLER VK4921 (K5.6) 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 Minimum Maximum Install the cover plate by inserting the adpater into the adapter cup and pushing or threading into place (depending on style). - Page 10 Refer to the appropriate technical data page and NFPA standards for complete care, handling, installation, and maintenance instructions. For additional product and system information Viking data pages and installation instructions are available on the Viking Web site at www.vikinggroupinc.com.
- Page 11 * Refer to the appropriate current technical data pages for complete care, handling, and installation instructions. Data pages are included with each shipment from Viking or Viking distributors. They can also be found on the Web site at www. vikinggroupinc.com.
- Page 12 • while ceiling finish work is being completed. Use only the designated Viking recessed sprinkler wrench (refer to the appropriate sprinkler data page) to install these sprinklers. NOTE: The protective cap is • temporarily removed during installation and then placed back on the sprinkler for protection until finish work is completed.
- Page 13 Take care not to crack the wax coating on the units. • For touching up the wax coating after installation, wax is available from Viking in bar form. Refer to Table 1 below. The coating MUST be repaired after •...
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Page 14: Listings And Approvals
1. DESCRIPTION Viking fire sprinklers consist of a threaded frame with a specific waterway or orifice size and a deflector for distributing water in a specified pattern. A closed or sealed sprinkler refers to a complete assembly, including the thermosensitive operating element. An open sprinkler does not use an operating element and is open at all times. - Page 15 TECHNICAL DATA SPRINKLER OVERVIEW 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 VERTICAL SIDEWALL (VSW) SPRINKLER: A sprinkler intended for installation near the wall and ceiling. The deflector provides a water spray pattern outward in a quarter-spherical pattern and can be installed in the upright or pendent position with the flow arrow in the direction of discharge.
- Page 16 Refer to NFPA 25 for Inspection, Testing and Maintenance requirements. 7. AVAILABILITY Viking 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.
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Page 17: Warranty Terms And Conditions
For more information, go to www.P65Warnings.ca.gov 2. WARRANTY TERMS AND CONDITIONS For details of warranty, refer to Viking’s current list price schedule at www.vikinggroupinc.com or contact Viking directly. New Bulletin Form No. F_111218 18.11.15...
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Questions and answers
please what is the difference between sprinkler VK 4921 and VK 492
The Viking sprinkler model VK4921 is a replacement for the VK492. Both are standard response 5.6 K-factor concealed pendent sprinklers. However, the VK4921 is UL Listed and FM Approved, while the VK492 is being replaced. The VK4921 may also include updated materials or design improvements.
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