ESFR PENDENT SPRINKLER
VK503 (K16.8)
TECHNICAL DATA
Page 2 of 6
Form No. F_120106 19.11.15 Rev 19.1
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
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Compression Screw: Stainless Steel UNS-S31603
Trigger and Support: Stainless Steel UNS-S31600
Fusible Element Assembly: Beryllium Nickel, coated with black acrylic paint.
Ordering Information:
(Also refer to the current Viking price list.)
Order ESFR Pendent K16.8 Sprinkler VK503 by first adding the appropriate suffix for the sprinkler finish and then the appropriate
suffix for the temperature rating to sprinkler base part number.
Finish Suffix: Brass = A
Temperature Suffix: 165 °F (74 °C) = C, 205 °F (96 °C) = E
For example, sprinkler VK503 with a Brass finish and a 165 °F (74 °C) temperature rating = Part No. 14073AC.
Available Finishes And Temperature Ratings:
Refer to Table 1.
Accessories:
(Also refer to the Viking website.)
Sprinkler Wrench:
Part No. 13635WB (double-ended wrench - Use Side A. Side B is for use with K25.2 ESFR Pendent Sprinkler
VK510) Available since 2006.
Sprinkler Cabinet:
Twelve-head capacity: Part No. 01725A (available since 1971)
4. INSTALLATION
A. Sprinklers must be handled with care. They must be stored in a cool, dry place in their original shipping container. Never install
sprinklers that have been dropped or damaged in any way. Such sprinklers should be destroyed immediately.
NOTE: Wet pipe systems must be provided with adequate heat.
B. The sprinklers must be installed after the piping is in place to prevent mechanical damage. Before installing, be sure to have the
appropriate sprinkler model and style, with the correct orifice size, temperature rating, and response characteristics.
C. With the sprinkler contained in the plastic protective cap, apply a small amount of pipe-joint compound or tape to the male threads
only, while taking care not to allow a build-up of compound in the sprinkler orifice.
D.
Use ONLY sprinkler wrench 13635WB (shown in Figure 1) for installing ESFR Sprinkler VK503! With the sprinkler con-
tained in the protective cap, install the sprinkler onto the piping by applying the sprinkler wrench to the sprinkler wrench
flats only, while taking care not to damage the sprinkler operating parts.
DO NOT use any other type of wrench, as this could damage the unit.
DO NOT use the sprinkler deflector or fusible element to start or thread the sprinkler into a fitting.
DO NOT exceed 50 ft. lbs. of torque (hand tight, plus approximately two full turns with the wrench) to install these sprinklers. Higher
levels of torque may distort the sprinkler inlet with consequent leakage or impairment of the sprinkler.
E. After installation, the entire sprinkler system must be tested. The test must be conducted to comply with the Installation Standards.
Make sure the sprinkler has been properly tightened. If a thread leak occurs, normally the unit must be removed, new pipe-joint
compound or tape applied, and then reinstalled. This is due to the fact that when the joint seal is damaged, the sealing compound
or tape is washed out of the joint. Immediately replace any damaged units, using the special sprinkler wrench only.
F. After installation and testing and repairing of all leaks, remove the protective caps from the sprinklers. Do NOT use any
type of tool to remove the cap. Remove the cap by hand: turn it slightly and pull it off the sprinkler. When removing caps,
use care to prevent dislodging or damaging sprinkler ejector spring and fusible element. THE CAPS MUST BE REMOVED
FROM SPRINKLERS BEFORE PLACING THE SYSTEM IN SERVICE!
WARNING
Viking sprinklers are manufactured and tested to meet rigid requirements of the approving agency. The sprinklers are
designed to be installed in accordance with recognized installation standards. System design must be based on ESFR
design guidelines described in the latest edition of Viking technical data, applicable FM Global Loss Prevention Data
Sheets, the latest NFPA Standards, the latest standards of Verband der Sachversicherer (VdS), Loss Prevention Council
(LPCB), the Authorities Having Jurisdiction, and also with the provisions of governmental codes, ordinances, and
standards whenever applicable. Deviation from the standards or any alteration to the sprinkler after it leaves the factory
including, but not limited to: painting, plating, coating, or modification, may render the sprinkler inoperative and will
automatically nullify the approval and any guarantee made by The Viking Corporation.
