20
For freezers or coolers that
fluctuate in temperature, an
automatic pressure control
system is required that utilizes
a special DIGITAL pressure
switch and solenoid valve that
allows antifreeze to be relieved
back into the CS-1 or reclaim
tank. Calculation of volume
fluctuation of the largest system
where multiple systems are
installed must be made in order
to make sure the tank volume
of antifreeze supply is large
enough to contain the volume differential. The APCS set point shall be at
least 5 PSI (34,5 kPa) greater than the maximum static or residual
supervisory pressure of the system. The PRV will be utilized as a safety
backup to the pressure control system in case of power loss and non-
presence of backup power system to the freezer temperature control
system.
If the pressure should increase due to warm-up above the rated static
pressure of the system, the pressure relief valve or automatic control
system will bleed off antifreeze solution and maintain the maximum
pressure of 175 PSI (1 207 kPa) or below at the sprinkler. It is
recommended to fill the system with antifreeze after the freezer is at the
sustained set temperature. Or, cool the antifreeze solution in the freezer
area and then add it to the system. This will allow the piping system to
establish a normal ambient temperature when filling the system with
antifreeze. Slight warming will occur during the fill process. Another option
is to fill the system while warm. Monitor tank level and add more solution
as needed as temperature cools.
5.1.8 CS-1 Pump
ISOLATION VALVE
SYSTEM(S)
CONNECTION(S)
PUMP
65 OR 160
CONTROL
PANEL
LIQUID SUPPLY
GALLON TANK
Summary of Contents for ESFR
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