Viking ESFR, Manual

8 

In the event of a fire, the system pressure supervisory switch that controls the pump unit 
is wired through the alarm switch located on the deluge valve and to the CS-1 pump unit. 
In this case, the CS-1 pump solenoid valve is restricted from opening for the riser that is 
flowing to the fire area and stops the flow of antifreeze to the discharging system. 
 

In order to effectively apply 100% water as rapidly as possible, the system size must be 
limited in volume. Full-scale fire testing of the 50% propylene glycol and water premix 
solution and a system volume of 1,100 gallons (4 163 liters) has been performed 
successfully at Underwriters Laboratories Inc., resulting in UL Listing of the ESFR 
VK510 Sprinkler for use with 35% or 50% propylene glycol and water solution. The 
system uses either a 35% or 50% (depending on the minimum temperature in the area 
being protected) by volume mixture of propylene glycol and water premix solution. 
 
The propylene glycol and water mixture cools and adds wetting ability to control the fire 
until water is applied to suppress the fire. The area of coverage for a single system is 
dependent upon the volume of the system required to cover the area being protected. 
The hydraulic calculations are necessary in order to properly size the system piping.  
 
For refrigerated area systems, the piping system shall be pitched to drain complete 
system toward the riser and Easy Riser

TM

 Check Valves with branch lines at ½” per 10 

ft. (4 mm/m) and mains at ½” per 10 ft. (4 mm/m) run of pipe. For systems in unheated 
areas subject to freezing, branch lines shall be pitched at ½” per 10 ft. (4 mm/m) and 
mains at ¼” per 10 ft. (2 mm/m) run of pipe.  
 
This system shall be designed by qualified fire protection technicians, in conjunction with 
requirements of the Authorities Having Jurisdiction. Viking ESFR Cold Storage Systems 
are designed to meet the UL Listing requirements described in Viking technical data for 
ESFR K25.2 Sprinkler VK510 for use with 35% or 50% propylene glycol and water 
solution, and the standards of NFPA 13 or other organizations, and also with the 
provisions of governmental codes, ordinances, and standards where applicable. This 
system shall meet all requirements of ESFR installations except where specified in this 
owner's manual. This system can be considered a wet system due to the system being 
filled with the approved antifreeze solution, and operation of the detection and preaction 
system will provide water supply and pressurized solution at the sprinkler upon 
operation. 

When using this system, ceiling-only sprinklers are required and no in-rack sprinklers are 
needed. The following storage configurations are required: 
 

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Single-row, double-row, and multiple-row rack storage is required and 
sprinklers shall be located in accordance with applicable Viking technical 
data and the latest recognized storage installation rules of NFPA or the 
Authority Having Jurisdiction (AHJ). 

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Open rack storage is required, and sprinklers shall be located in 
accordance with applicable Viking technical data (refer to the latest 
issue of sprinkler data page 46 a-c) and the latest recognized storage 
installation rules of NFPA or the Authority Having Jurisdiction (AHJ).