Technical data

TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Telephone: [phone] Technical Services 877-384-5464 Fax: [phone] Email: [e-mail]
ESFR PRE-PRIMED SINGLE
INTERLOCK PREACTION
COLD STORAGE SYSTEM
Page 49
March 7, 2008
D. CS-1 Control Scheme
1. Pump Operation
The pressure switch mounted on the CS-1 controls pump operation. When the pressure at
the CS-1 drops, the pump will turn on until the pressure at the CS-1 rises above a set level.
In “Automatic” mode, pump operation is inhibited if the level of liquid in the unit’s storage
tank drops below the level switch height.
In “Manual” mode, the pump operates when CS-1 pressure drops, a system valve is se-
lected, if that system pressure is not met, and there is no alarm condition. The pump can
also fill the tank in Manual mode. For tank filling, the level switch position is not used and
the operator must start and stop the pump, using the “Man” position of the Man-Off-Auto
Switch on the control panel.
In Automatic mode, there is a 10-minute time delay between pump operations. After the 10-
minute delay, the pump operates if the CS-1 pressure drops and tank fluid level is above
the level switch height. When the pump shuts off, the 10-minute timer starts again and the
pump will not operate until 10 minutes is complete.
2. System Solenoid Valve Operation
Each system (riser) pressure switch and alarm pressure switch contacts are connected
in series to one input on the PLC. The system pressure switch opens on falling pressure.
The alarm pressure switch normally closed contacts are used and open in the alarm condi-
tion.
In Automatic mode, each system solenoid valve opens if its system pressure drops to
a low-pressure condition and there is no alarm pressure signal. In manual mode, each
system valve is selected by means of two selector switches and the solenoid valve opens
as long as system pressure is below the set-point value and there is no system alarm.*
Note: To operate in manual mode, all switches must be wired.
3. Level Switch Relay Coil Operation
The level switch relay coil is energized when the tank level is above the level switch height.
This is when tank level is satisfied. The switch relay coil de-energizes when tank level
drops to the level switch height, at low tank level.
E. Filling the Reservoir Tank
The CS-1 has been designed to fill the reservoir tank using either of two methods: gravity fill
or pumped fill. NOTE: This is NOT a self-priming pump. Manually prime or fill the reservoir for
prime.
*NOTE: Never leave the unit unattended when filling the system or tank. Running the
pump dry, without liquid, will damage pump seals and possibly damage pump impel-
ler.
Follow the steps below:
1. Gravity Fill:
Turn off and isolate the electrical supply to the unit.
Close Supply Isolation valve.
1.
2.