Viking VK449 Instruction Manual

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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
Replaces Form No. F_061721 Rev 02
(Removed 175 deg.)
1. PRODUCT IDENTIFICATION
This document covers the following products, hereafter referred to as “sprinkler":
VK449: Fast Response, Residential Horizontal Sidewall, K4.0 (57.7 metric)
Sprinklers
2. INTENDED USE
The spinklers are designed for wet systems where it is necessary to prevent
water or condensation from entering the supply nipple before sprinkler operation.
They may also be installed in spaces subject to freezing and supplied from a
wet system in an adjacent heated area. The sprinkler is intended to be used in
automatic fire sprinkler systems as allowed by applicable approval authorities.
The sprinkler must be used in accordance with:
1. the sprinkler’s Listings, Approvals, and associated design requirements
2. the recognized design and installations standards issued, for example NFPA
or FM Global.
3. the latest revisions of all applicable manufacturer’s documentation
Additionally, the provisions of governmental codes, ordinances, and standards
may apply.
NOTE:The Installation guidelines and requirements may differ depending on the approval body.
3. LISTINGS AND APPROVALS
Refer to section 6 for requirements that must be followed.
cULus Listed
Refer to the Approval Chart and Design Criteria for Listing and Approval requirements that must be followed.
4. TECHNICAL SPECIFICATIONS
4.1 Ratings and Physical Characteristics
Parameter Value
Minimum operating pressure 7 psi (0.5 bar)
Maximum rated pressure 175 psi (12 bar)
Factory tested pressure 500 psi (34.5 bar)
Thread size 1" NPT or 25 mm BSPT
Nominal K–factor 4.0 U.S. (57.7 metric)
Minimum temperature rating (glass bulb) –65 °F (–55 °C)
Available since April 2023.


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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
4.2 Markings
Ref. Description Value
AOrientation indicator Text “TOP”
BManufacturer’s Sprinkler Identification Number (SIN) VK449
CListing logo cULus
DFlow direction indicator See markings
ENominal K-factor 4.0
FNominal temperature rating See marking
GFrame orientation indicator See marking; see Figure 6.
4.3 Materials of Construction
Description Material
Compression screw 18-8 stainless steel
Flow shaper Brass UNS-C23000 or UNS-C51000
Frame casting QM brass or brass UNS-C84400
Pip cap adapter Polytetrafluoroethylene (PTFE)
Pip cap Brass UNS-C36000
Belleville spring sealing assembly Nickel alloy, coated on both sides with PTFE tape
Yoke Phosphor bronze UNS-C51000
Bulb Glass, nominal (3 mm) diameter
Orifice Copper UNS-C11000 or UNS-22000
Tube ERW hydraulic steel tube
Inlet and barrel end QM brass
Support (internal) Brass UNS-C36000
Barrel Steel pipe UNS-G10260, electrodeposited epoxy base finish
Recessed dry escutcheons Cold rolled steel: UNS-G10080
ENT recessed escutcheons Stainless steel UNS-S30400
Figure 2: Markings
A
B
CD
D
E
F
G

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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
5. INSTALLATION
Refer to appropriate NFPA Installation Standards and Figures 3, 4, 5. and 6.
Figure 3: Using the Sprinkler Installation Wrench
Figure 4: Installation Dimensions with Adjustable Recessed Escutcheon
2
6
3
4
Ref Variable Parameter Minimum Maximum
1Wall opening  
2Deflector to ceiling distance 4” (102 mm) 12” (305 mm)
3Deflector to wall distance  2” (51 mm)
Ref Fixed Parameter Value
4Escutcheon depth 
5Escutcheon outer diameter 
6Top of deflector to centerline 
51
Finished Wall
Finished
Ceiling

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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
Figure 5: Installation Dimensions with G-1 Escutcheon
Figure 6: Sprinkler Orientation
6
Ref Variable Parameter Minimum Maximum
1Wall opening  
2Deflector to ceiling distance 4” (102 mm) 12” (305 mm)
*NOTE: The “A” dimension will allow 1/4” (6 mm) adjustment in either direction.
Ref Fixed Parameter Value
3Escutcheon depth 1¹/” (27 mm)
4Escutcheon outer diameter 4” (102 mm)
5Escutcheon outer cup inner diameter ” (16 mm)
6Escutcheon rim thickness 
7Escutcheon inner adapter depth 
Ref Parameter
ATop of deflector marked with “TOP”
BLeading edge of the top of the deflector must be
parallel with ceiling
CFrame arms must be perpendicular to ceiling
D Ceiling
Finished Wall
Finished
Ceiling
1
Adapter ring Outer cup
7
3
5
6
4
2
TOP
B
A
C
D
NOTE: Frame orientation mark
must be oriented on the bottom
left corner (when facing the
sprinkler)

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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
6. LISTING AND APPROVAL DESIGN REQUIREMENTS
All sprinklers are to be installed in accordance with the latest revisions of all applicable manufacturer’s documentation, installation
standards, and also with the provisions of governmental codes, ordinances, and standards, whenever applicable.
6.1 cULus Listing Requirements
Residential Dry Horizontal Sidewall Sprinklers are cULus Listed as Indicated in the Approval Chart for Installation in accordance with
the latest edition of NFPA 13, 13R, or 13D for residential sprinklers.
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 NFPA13R 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 NFPA 13.
In addition, the following criteria apply:
• Designed for use in Residential occupancies in accordance with NFPA 13.
• Minimum spacing allowed is 8 ft. (1.8 m).
• Deflector must be positioned between 4” and 12” (102 mm and 305 mm) below the ceiling. Keep the leading edge of the deflector and the cen-
terline axis of the sprinkler frame oriented parallel with the ceiling.
• Locate no less than 4” (102 mm) from end walls.
• Maximum distance from end walls shall be no more than one-half of the allowable distance between sprinklers. The distance shall be measured
perpendicular to the wall.
• The sprinkler installation and obstruction rules contained in NFPA 13 for residential sprinklers must be followed.
6.2 Corrosion Resistant Coatings
The white polyester and black polyester finishes are cULus listed as corrosion resistant. Prior to installation, verify that the coatings
are compatible with, or suitable for, the proposed environment.
IMPORTANT: Always refer to Bulletin Form No. F_091699 - Care and Handling of Sprinklers. 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, FM Global, LPCB, APSAD, VdS or other similar
organizations, and also with the provisions of governmental codes, ordinances, and standards, whenever applicable.

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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
6.3 Listing and Approval Specifications
Table 6.3: Approval Chart
Viking VK449, 4.0K-Factor Dry Residential Horizontal Sidewall Sprinkler
For Wet Pipe systems designed to NFPA 13D or NFPA 13R. For Wet Pipe systems designed to NFPA 13, refer to the design criteria.
For Ceiling types refer to current editions of NFPA 13, 13R or 13D.
Sprinkler
Base Part
Number 1
Style SIN
Thread Size Nominal K-Factor Maximum Water
Working Pressure
Lengths
NPT BSPT U.S. Metric Increments
Inches
Minimum
Inches (mm)
Maximum
Inches (mm)
24961 Recessed VK449 1” -- 4.0 57.7 175 1/4"  (95) 24 (610)
25556 Recessed VK449 -- 25 mm 4.0 57.7 175 1/4"  (95) 24 (610)
Footnotes
1. Part number shown is the base part number. For complete part number, refer to Viking’s current price schedule.
2. Listed by Underwriter’s Laboratories, Inc. for use in the United States and Canada.
3. Approved Finishes are: brass, chrome, ENT, white polyester, and black polyester.
4. Sprinklers with the white and black polyester finishes are cULus listed as corrosion resistant.
5. Other paint colors are available on request with the same cULus listings as the standard finish colors.
6.4 Hydraulic Design Criteria
Table 6.4: Hydraulic Design Criteria1
Viking VK449, 4.0K-Factor Dry Residential Horizontal Sidewall Sprinkler
For Wet Pipe systems designed to NFPA 13D or NFPA 13R. For Wet Pipe systems designed to NFPA 13, refer to the design criteria.
For Ceiling types refer to current editions of NFPA 13, 13R or 13D.
Max. Coverage Area 1
Width X Length
Ft. X Ft.
(m X m)
Max. Spacing
Ft.
(m)
Temperature Rating
Top of Deector to Ceiling
155 °F (68 °C) 200 °F (93 °C)
Flow 2
GPM
(L/min)
Pressure 2
PSI
(bar)
Flow 2
GPM
(L/min)
Pressure 2
PSI
(bar)
12 X 12 (3.7 X 3.7) 12 (3.7) 13 10.6 13 10.6
4 to 6 inches
14 X 14 (4.3 X 4.3) 14 (4.3) 14 12.3 14 12.3
16 X 16 (4.9 X 4.9) 16 (4.9) 18 20.3 18 20.3
16 X 18 (4.9 X 5.5) 16 (4.9) 21 27.6 21 27.6
16 X 20 (4.9 X 6.1) 16 (4.9) 25 39.1 25 39.1
12 X 12 (3.7 X 3.7) 12 (3.7) 13 10.6 14 12.3
6 to 12 inches
14 X 14 (4.3 X 4.3) 14 (4.3) 15 14.1 15 14.1
16 X 16 (4.9 X 4.9) 16 (4.9) 19 22.6 19 22.6
16 X 18 (4.9 X 5.5) 16 (4.9) 21 27.6 21 27.6
16 X 20 (4.9 X 6.1) 16 (4.9) 25 39.1 25 39.1
1. 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 ap-
provals. Refer also to Design Criteria.
2. 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.

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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
Ambient Temperature
of the Protected Area*
at the Discharge End
of the Sprinkler
Exposed Barrel Ambient Temperature
40 °F (4 °C) 50 °F (10 °C) 60 °F (16 °C)
Exposed Minimum Barrel Length**
Face of the Tee to the Outer Surface of the Wall
Inches (mm) Inches (mm) Inches (mm)
40 °F (4 °C) 000
30 °F (-1 °C) 000
20 °F (-7 °C) 4 (100) 0 0
10 °F (-12 °C) 8 (200) 1 (25) 0
0 °F (-18 °C) 12 (300) 3 (75) 0
-10 °F (-23 °C) 14 (350) 4 (100) 1 (25)
-20 °F (-29 °C) 14 (350) 6 (150) 3 (75)
-30 °F (-34 °C) 16 (400) 8 (200) 4 (100)
-40 °F (-40 °C) 18 (450) 8 (200) 4 (100)
-50 °F (-46 °C) 20 (500) 10 (250) 6 (150)
-60 °F (-51 °C) 20 (500) 10 (250) 6 (150)
6.5 Minimum Exposed Barrel Lengths

minimum exposed barrel length that is in accordance with the latest edition of NFPA 13 (refer to Figure 7).
The minimum exposed length shall be measured along the length of the dry sprinkler from the face of the fitting to which the dry
sprinkler is installed to the inside surface of the insulation, or wall leading to the cold space, whichever is closest to the fitting.
NOTES:
• The protected area refers to the area below the ceiling, the ambient temperature is the temperature at the discharge end
of the sprinkler. For protected area temperatures that occur between the values listed, use the next cooler temperature.
• The minimum required barrel length is not the same as the “A” dimension. Refer to Figure 8 for the “A” Dimension.
• Exposed minimum barrel lengths are inclusive up to 30 mph wind velocities.
Figure 7: Minimum Barrel Length Based on Ambient Temperature in the Protected Area
Exposed
Barrel
Outer surface
of wall

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Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
7. ORDERING PROCEDURE
7.1 Sprinkler
When ordering the sprinkler, the “A” dimension must be known. The “A” dimension is the distance as measured from the face of
the fitting in which the sprinkler will be installed to the face of the finished surface in the protected area. See Figure 7 to determine
this dimension.
1. Based on desired escutcheon model, determine the “A” dimension as shown in Figure 8; measure from the centerlines of the
tee and hole.
2. Round to the nearest 1/4” (16 mm) between 3-3/4” (83 mm) and 24” (610 mm).
3. From below, choose a sprinkler base part number with the required thread size and listing or approval (refer to section 6).
NOTE: If the Model G-1 escutcheon is desired, add the suffix “Y”. See Figure 5.
4. Add the suffix for the desired finish.
5. Add the suffix for the desired temperature rating.
6. Add the number that indicates the “A” dimension.
NOTE:Where a dash (–) is shown in the finish suffix designation, insert the desired temperature rating suffix.
EXAMPLE: 24961MB/W12 is a VK449 with a white polyester finish and a 155 °F (68 °C) temperature rating with “A” dimension of
12 inches. This sprinkler is to be installed into an area with a maximum ambient temperature of 100 °F (38 °C).
3. Sprinkler 4. Finish 5. Temperature Rating
IMPORTANT: See Section 5
Description Suffix
Nominal
Temperature
Rating
Bulb
Color
Maximum Ambient
Ceiling Temperature Suffix
SIN Part
Number Size
VK449 24961  Brass A 155 °F (68 °C) Red 100 °F (38 °C) B
VK449 25556 25 mm BSPT Chrome F 200 °F (93 °C) Green 150 °F (65 °C) E
White Polyester M–/W
ENT JN
A
Adjustable Recessed Escutcheon:
Figure 8: “A” Dimension
G-1 Escutcheon:
HOLE
TEE
A=√(B+C
B
EXAMPLE: If “A” dimension is
12 inches, and the sprinkler
is recessed 1/2” (5.5 mm),
the deflector will be located
1.384 inches (35 mm) off
the wall
C
A

Page 9 of 10
Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
7.2 Sprinkler Accessories
Part Number Description
24689M/B Heavy duty metal socket wrench
05459AF Recessed dry escutcheon cup, chrome finish
05459AM/W Recessed dry escutcheon cup, white polyester finish
05459AM/B Recessed dry escutcheon cup, black polyester finish
07529JN Recessed dry escutcheon cup, ENT finish
20133 Replacement G-1 escutcheon assembly (white shown, for
other colors or finishes, contact customer service)
22087M/W Dry barrel seals

Page 10 of 10
Form No. F_061721 Rev 03 April 2023
RESIDENTIAL DRY HSW
SPRINKLER K4.0 (57.7)
VK449
TECHNICAL DATA SHEET
8. CONTACT
The sprinkler and accessories are available through Viking distributors only. Contact your local Viking sales office which can be
found on our website:
Americas and Asia: www.vikinggroupinc.com/locations OR Europe, Middle East, Africa (EMEA): www.viking–emea.com/contact
Manufacturer:
The Viking Corporation
5150 Beltway SE
Caledonia, MI 49316
Tel.: [phone]
Fax: [phone]
Technical Services: 1–877–384–5464
[email protected]
Importer EU:
Viking S.A.
21, Z.I, Haneboesch
L–4562 Differdange / Niederkorn
Tel.: [phone] – 1
Fax: [phone]
vikinglux@viking–emea.com
Asia Pacific (APAC) Main Office:
The Viking Corporation (Far East) Pte. Ltd.
69 Tuas View Square
Westlink Techpark, Singapore 637621
Tel: [phone]
Fax: [phone]
vikingAP[email protected]
Replaces Form No. F_061721 Rev 02
(Removed 175 deg.)