Taylor-Wharton 24K w/ AutoTend - Manual (Page 31)

WARNING: Never use chlorine-based disinfectants to clean a CryoStorage
System.
Normal Evaporation Rate (NER) Test
Nitrogen consumption is an accumulation of all system components and user-
introduced evaporation. The storage chamber is a double walled, vacuum insulated
vessel and contributes to the daily consumption of liquid nitrogen. The liquid nitrogen
supply vessel and transfer hose also contribute greatly to the daily consumption rate.
Choosing to control the vapor temperature, combined with the liquid level and tem-
perature specified, will affect the overall nitrogen consumption. In addition to these
variables, opening the lid to retrieve product, and adding new product into the storage
chamber will pay a role in the accumulative liquid nitrogen consumption.
If the nitrogen consumption of your CryoStorage system seems excessive, it may be
appropriate to perform an estimated Normal Evaporation Rate (NER) test on the
CryoStorage chamber. To perform an NER test:
1. Fill the CryoStorage unit to the “High Level” sensor.
2. Measure the liquid nitrogen level with a plastic or wooden measuring rod.
WARNING: Never use hollow rods or tubes as dip-sticks. When a warm tube
is inserted into liquid nitrogen, liquid will spout from the top of
the tube and may cause personal injury.
3. Close and lock the lid of the CryoStorage System for forty-eight (48 hours.
4. Open the CryoStorage System and measure the liquid nitrogen level. Typically,
liquid nitrogen levels will drop approximately 1 in. (25.4mm) per day. If your
measurement indicates a drop in excess of 2.0 in. (51 mm) per day, please
contact your Taylor-Wharton distributor or Taylor-Wharton for further information.
Please have your serial number, this manual and service history available.
WARNING: The source power supply at 110/120VAC can cause a lethal electri-
cal shock. Unplug the power cord before proceeding with any
repairs.
The KRYOS has been designed for easy setup and maintenance. All connectors on
the controller are uniquely identified snap-on plugs. The thermocouple, sensor
assembly, solenoid valve, power, remote alarm, temperature recorder and data lines
can be connected or disconnected in seconds. For the 10K and 24K, the controller is
connected to the back electrical panel with a wire cable with the appropriate snap-on
connectors.
Removing/Installing the Controller 10K/24K Units
Remove the cabinet top, follow the steps illustrated in Figure 14. Remove two (2)
screws from the controller and lift it from the refrigerator far enough to detach its
electrical connection wiring. Remove four (4) screws from the top of the refrigerator
and lift the cabinet top to gain access to the area between the cabinet and the insu-
lated inner vessel. On the 10K and 24K, the cabinet top may only be raised as shown
because of the lid hinges. Do not remove the hinged lid. After the cabinet top is
loosened and propped up, the electrical connection wiring may be detached to allow