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1.Power up the ULT freezer. Let it run to the set freezer temperature.
2.Turn on the main power switch and the battery charge switch on the
backup system.
3.Start the test procedure. Set the backup system's set point temperature
10 C colder than the actual freezer temperature. The backup system will
start injecting coolant into the freezer. Open the freezer door, the injection
should stop. Close the door, the injection will continue as long as the backup
system's set temperature is not satisfied. The door switch directly controls
the action of injection solenoid valve for safety reason. A Preventive
Maintenance procedure should always include checking the contact integrity
and the function of the door switch.
4.When the freezer is at stable temperature, set the backup system's set point
temperature 10℃ warmer than the freezer temperature to avoid unnecessary
coolant injection. A user should decide the set point value based on the critical
nature of the stored products. For a CO2 backup system, the system will inject
continuously if the set point is lower than -75℃.
5.If the freezer is turned off, unplug the door switch harness from the back of the
backup system. This will stop any unnecessary coolant injection while the
battery is charged.
6.Keep the backup system connected to a power supply. If the battery runs the
system for a long period of time, the battery may not be rechargeable.
7.The consumption rate of LCO2 and LN2 depends on the size of the freezer
and product load. The average consumption rate is between 2 and 4 kg/hr.
A backup system should be cleaned regularly. For safety, disconnect its power before
cleaning. Use a soft cloth and mild detergent solution for cleaning if necessary. Use a
dry cloth to dry it off after cleaning.
Never use a strong solution such as organic chemicals, boiling water, detergent, acid or
a hardwire brush to clean the equipment. Do not use a water hose to flush the system.
If the system is out of service for a while and it needs to be cleaned, follow the
instruction above.
The equipment should be inspected by qualified personnel on a regular basis. Should
there be any issues, consult with the factory or your representative.
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