26
maintains the desired solution pressure. The ESFR Pre-Primed Single
Interlocked Preaction Cold Storage System utilizes the Viking Deluge Valve and
Easy Riser
TM
Check Valve with special trim to isolate the antifreeze in the system
from the water supply. (NOTE: For previous Viking ESFR Cold Storage Systems,
which utilized a wet system with the Model J-1 Alarm Check Valve, please
contact the Viking Technical Services Department for details.)
In cold storage areas where temperature can fluctuate, over-pressurization of the
system can occur and cause the Pressure Relief Valve (PRV) to operate when
the set point is reached. Normal operation of PRVs include operation at 90-105%
of the set point and closing at 80% or above the set point. The Automatic
Pressure Control System (APCS) is designed to maintain a safe operating
pressure below the set point of the PRV and above the normal set pressure
range of the CS-1 antifreeze pump system. In a warm-up situation, temperature
fluctuations of the freezer area cause the pressure to also fluctuate. If the
pressure increases over the set point of the PRV, the APCS is desired to prevent
the PRV from operating, except for emergency situations where extended power
loss may occur.
The CS-1 Tank and Pump System is designed to maintain normal system
supervisory pressure at 50 PSI (344 kpa) minimum for pre-primed preaction
systems.
The APCS includes an electronic digital pressure switch that includes a normally
open SPST switch that is set to close at a pressure below the PRV set point and
open above the shut off pressure of the sprinkler system control switch of the
pump system. A normally closed solenoid valve is to be installed on the primary
Easy Riser
TM
Check Valve at the ¼” connection provided. A 115 volt AC, 50 or 60
Hz. 15 to 20 ampere GFI protected electrical power supply is to be provided
directly to the switch and solenoid valve. The power supply from switch to
solenoid valve shall be wired through a non-interrupted alarm pressure switch.
This will prevent the APCS valve from operating when system trips. As the
pressure switch closing set point is reached due to system pressure increase
upon warm-up of the freezer area, the switch will directly open the solenoid valve
and release antifreeze solution back to the system reservoir tank. When the
pressure reaches the lower setting, the switch will open, shutting off power to the
solenoid valve and stopping flow of antifreeze. The APCS will NOT operate
when the deluge valve has operated.
NOTE: The Viking ESFR Cold Storage System shall be designed by qualified fire
protection technicians, in conjunction with requirements of the Authorities Having
Jurisdiction. These systems are designed to meet the UL Listing requirements
described in Viking technical data for ESFR K25.2 Sprinkler VK510 for use with
propylene glycol/water solution, and the standards of NFPA 13 or other
organizations, and also with the provisions of governmental codes, ordinances,
and standards where applicable.
6.2 Application
For thermal cycling freezers and coolers having closed non-compressible
antifreeze systems, pressure can fluctuate drastically and possibly increase over
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals