Taylor-Wharton CS Series - Manual (Page 23)

21
CS SERIES
Temperature Control
The CS SERIES Control System has the capability to control the vapor temperature
at the top of the freezer. The temperature is controlled at the location of
thermocouple 1.
To maintain temperature, the CS200 SERIES Control System bubbles N2 gas
through the pool of LN
2
in the bottom of the freezer. The nitrogen gas evaporates
some of the LN
2
causing a cooling effect reducing the temperature in the freezer.
Since a pool of LN
2
is important in the process of temperature control, an adequate
level is always maintained by the control systems and the level control always takes
precedence over temperature control. Temperature control will not work if the LN
2
level is above High Level Alarm.
Enabling the temperature control feature will always increase the use of LN
2
.
The increased consumption will depend on a number of factors including the
temperature to be maintained, the range of the controlled temperature, the ambient
temperature and the length of supply hose connected to the freezer and the
frequency which users open the lid or otherwise introduce heat.
Battery Operation
The CS200 SERIES Control System is designed to operate with or without an optional
battery backup system if required. Simply plug the battery into the appropriate
connector. The control will recognize that the battery has been connected and will
activate the battery backup mode.
LED Status Wheel
The CS SERIES Control System offers an innovative concept called a status wheel. In
normal operation, the LED’s on the status wheel light to show a slow rotation of the
wheel. If an error condition occurs, the control will alert the user with an additional
visual alarm from the status wheel. The rotation can be accelerated, flashed or even
illuminated in the opposite direction.
Condition LED Flash Property
Normal Clockwise pattern, 1 LED per second
General Error Clockwise pattern, rapid rotation, flash
Figure 7.0 LED Status Wheel Flash Patterns
Lid Switch
The lid switch consists of a magnet and a pickup installed on the lid. The control can
determine when the lid is opened because the magnet moves out of range of the
pickup and the circuit becomes open. A number of features are associated with the
lid switch such as Auto Defog, Quickchill and the Lid Open Too Long Alarm. If the
lid switch is deactivated, these features are also disabled.