Viking ESFR, Manual

12 

remote sprinklers as calculated. The operation of the control valve is caused by 
the operation of the detection system after sensing a fire condition. The 
installation position must be directly adjacent and at the bottom of the supply 
riser to the area of protection and must be in a heated room that maintains a 
minimum temperature of 40 

°

F (4 °C). 

• 

The primary Easy Riser

TM

 Check Valve is a Viking Model F-1 that includes a 

system main drain, inlet connection for antifreeze supply, system pressure 
switch, system supervisory switch and gauges to monitor system antifreeze 
pressure and control the CS-1 antifreeze pump system. This check valve must 
be located downstream of the deluge valve (within 1 to 2 ft maximum). It is 
recommended to install this check valve as close to floor level as convenient in 
order to properly maintain the valve. The inlet side of valve is atmospheric air, 
while the outlet will be the desired static antifreeze pressure to the system. 
Options for the check valve include pressure relief valve (see selection below) 
and automatic pressure control system for variable temperature freezers and 
coolers described below. 

• 

A second thermal isolation valve (Viking Model F-1 Easy Riser

TM

 Swing Check 

Valve) is installed as close to the freezer wall as possible but at least 5 ft above 
or downstream of the primary check valve within the heated area of the riser 
room to prevent thermal migration of the antifreeze from the freezer and protect 
the primary check valve from freezing near the atmospheric air surface of the 
clapper and seat. This valve includes a main drain and a special 3/8” I.D. copper 
tube by-pass to allow proper system pressure monitoring and prevent thermal 
migration to primary check valve. The main drain must be piped to the main drain 
of the primary check valve and returned to the recovery tank.  

• 

Releasing control panel shall be a listed releasing panel capable of single hazard 
and two-zone operation. The control panel shall be provided with a 90-hour 
backup battery supply. Zone 1 shall operate the releasing circuit and alarm. Zone 
2 shall detect low pressure antifreeze and provide alarm. 

• 

Detection is required for this system.  The detection system shall be capable of 
operation prior to or equal to an ESFR Sprinkler having an RTI (Response Time 
Index) of 50 or less.  No linear detection shall be allowed.  This limits the system 
to low temp spot heat, beam smoke or air sample type smoke system or equal. 

5.0 

SYSTEM INSTALLATION REQUIREMENTS AND CONSIDERATIONS 

5.1  Tree Configuration - ESFR Cold Storage System 

A tree type piping configuration is required for this type system over the grid type 
system because this type of system is easier to set up for drainage. Also, with a 
center feed main supplying branch lines, the flow is directed toward the first open 
sprinklers. This allows the antifreeze solution to be expelled from lines and mains 
leading directly to open sprinklers and to be replaced with 100% water much 
faster than in grid type systems. For tree systems utilizing this system, the mains