The TG version means a double refrigeration system. KW uses completely independent “twin systems” both for the electrical and fluid-dynamics circuits.
Even KW’s NEW ICE AGE CONTROL® systems are independent, yet connected to achieve an intelligent operation. They operate alternatively once the set point is reached.
KW’s solution has unique features regarding the quality, stability and uniformity of the temperature.
Ventilated refrigeration with uniform temperature: this uniformity is guaranteed by the continuous operation of the vents, or of at least one vent during the defrost stage of the non-refrigerating group. The application of twin systems allows optimal stability of the internal T, as shown by tests carried out in our laboratories (both for positive and negative temperatures); below is an example:
This means working with high-quality conservation T.
And all this is possible with the use of two controllers KW NEW ICE AGE CONTROL® SPLIT.
Description of the twin systems:
- There is scheduled group operation with continuous alternation after the set point is reached by one of the two systems; then the other one restarts and thus guarantees operational continuity (not just temporal, like with a timer); in turn this guarantees minimum wear of the mechanical component parts and more reliability
- If, during the alternation, one of the two twin systems is defrosting, the other knows about this condition (thanks to data transmission between them) and the alternation is delayed until the defrosting finishes: there is no functional conflict
- If, during the alternation, one of the two groups breaks down, the other knows about this condition and starts the refrigeration cycle regardless of the alarms or repairs executed on the damaged group
- These min./max. T alarms are separately managed for each group; they can be configured as max. set point deviation alarms or absolute max,/min. alarms not associated to a set point
- The two T sensors can regulate each other (KW default solution) and manage the alarms, so in case one fails the other continues to operate; in case both fail, the alternation ends. Or, the group with the damaged sensors passes the activity to the twin. The corresponding alarms are then activated. In case the CPU of one of the two regulation systems fails, the alternation ends. The corresponding alarms are then activated. About the refrigerant circuit, in those cases where there are two systems two evaporators can be used, or a single dual-circuit evaporator.
KW has selected it: for the 2,300-litre and other models, if dimensions are compatible, then the solution with two evaporating batteries; for 1,500-litre models, the dual-circuit exchanger solution. With two fans, even in case of failure or a group vent the internal preservation T is guaranteed; in both solutions, internal temperature uniformity and stability are always guaranteed by continuous air circulation, whether at the evaporating pack of the operating group or that of the standby group. Similar experiences in the pharmaceutical field, which requires very high levels of conservation quality (or T stability and uniformity within a very narrow range), show the validity of the solutions adopted by KW.
In summary, with the use of KW’s New Ice Age Control is it possible to manage refrigeration with the utmost safety and the following features:
- Both groups function in alternation during the normal thermal cycle, where each one alternatively reaches the configured T, reducing mechanical wear and tear; vents in both evaporators turn continuously, and in this way guarantee better internal T uniformity
- During the alternation, both groups talk to each other through the aforementioned control, allowing:
- managing the defrosting of each group while the other one works, insuring maximum internal T stability even during defrosting
- managing breakdown situations, starting the working group and shutting down the group showing damage -and alarms- until fixed
- The controls of both groups can be fitted with 2 RTD Pt 100 Ohm sensors, one configured as regulation and the other, as alarm
- If the regulation sensor is damaged, the group executing the condensation motion continues operating according to historical on/off times stored in memory; the sensor alarm is activated
- If the alarm sensor is damaged, the group executing the condensation motion continues operating with the regulation sensor; the sensor alarm is activated
- If both sensors are damaged, the corresponding condenser is excluded and the other group intervenes permanently
- If the CPU is damaged, the corresponding group is excluded and the other group intervenes permanently