HC SERIES - Taylor-Wharton

TW-27
HC SERIES
High Capacity
Liquid Nitrogen
Refrigerators
The High Capacity Series of Cryogenic Refrigerators is
designed for storing large quantities of material at liquid
nitrogen temperature. Seven different models provide
holding times and capacities to fit a variety of storage
needs. Applications range from industrial to laboratory;
biological and non-biological material. Low-profile (HCL)
models are available for applications where a shorter unit
may be needed.
Material to be stored in cryogenic refrigerators is placed in
canisters which are suspended from the top of the unit
and immersed in liquid nitrogen and cold nitrogen vapor.
When immersed in liquid nitrogen, storage temperatures
are -320°F (-196°C). Vapor-phase temperatures above
the liquid will vary according to the physical characteristics
of the refrigerator. In HC Series units, this temperature
generally will vary between -300°F (-184°C) under
the closed necktube core and -320°F (-196°C) at the
surface of the liquid.
§ Optimal Holding Time – Modern materials and insulation
system design are combined to provide a line of
refrigerators with optimal holding times consistent with
high volume storage.
§ Rugged, Dependable – Construction details such as an
aluminum ribbed body, a tough paint system and rugged
necktube design provide exceptional durability for a
vacuum insulated container.
§ Ease of Operation - Canisters can be inserted or
removed easily due to generous inner vessel headroom
and a convenient canister indexing system that includes
a guiding fixture inside the unit. The lightweight, thermally
efficient design provides optimal portability for
every container.
§ High Capacity - The exceptional capacities of these
units are derived from a design that accommodates
large canister sizes and a greater number of canisters.

Safety
Before using any Cryogenic Refrigerator, read the Handle
with Care booklet provided with the unit. It details safety
and unit care precautions that must be read an understood
before using the equipment. If a replacement
booklet is needed, order publication TW-10 from your
supplier.
Following are a few of the precautions described in the
Handle with Care booklet. Please be sure to read the
entire booklet before using these refrigerators.
Use only liquid nitrogen or liquid argon in these refrigerators.
The use of liquid air or liquid nitrogen may cause an
explosion or fire. Do not touch liquid or cold metal surfaces
with your bare skin. The liquid nitrogen stored in
these containers is extremely cold: -320°F (-196°C).
Exposure to skin or eyes to liquid, cold gas, or frosted parts
could result in a severe frost-bite like injury.
Because of the extremely low temperature, a face shield
and gloves must be worn when transferring liquid into or out
of these refrigerators.
Use only the necktube core provided with this unit or a
listed replacement part. A tight-fitting plug or stopper will
cause a pressure increase in the refrigerator that may
damage the container and/or cause personal injury.
Store and use these refrigerators only in well ventilated
places. In a confined area, nitrogen from these units may
cause suffocation by displacing air needed for breathing.
Operation
Filling – Adding liquid nitrogen to a warm container may
cause splashing and will generate a significant volume of
nitrogen gas as cold liquid contacts warm surfaces. Add
liquid slowly to minimize these effects. Be sure there is
adequate ventilation. Keep your head clear of the heavy
volume of vapor that may be produced; it is extremely cold
and could cause personal injury.
Determining Liquid Level – The liquid level in the container
can be determined by measuring with a dipstick. Insert the
dipstick straight into the container so that is always rest on
the bottom of the unit. After 5 or 10 seconds, withdraw the
dipstick and wave it back and forth in the air. A frosted
section will form representing the depth of liquid in the
container.
not being accessed. When accessing stored material, the
necktube core should be removed as briefly as possible.
When inserting or removing canisters, grasp the canister
handle, life and tilt the canister toward the center of the
refrigerator, and withdraw the canister only far enough to
remove the contents. Completely withdrawing the canister
will unnecessarily expose stored materials to warm conditions.
WARNING
Never use hollow rods or tubes as dipsticks. When a
warm tube is inserted into liquid nitrogen, liquid will
spout from the top of the tube and may cause personal
injury.
The liquid level chart shows volume of liquid nitrogen vs.
depth for HC Series refrigerators. These values are approximate
and are based on a standard condition with no stored
material in the container; with stored material, the liquid
volume will be slightly less than the value from the chart.
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Inserting or Removing Canisters – To prevent the unnecessary
loss of liquid nitrogen refrigerant, the necktube core
should remain in the container when the stored material is
WARNING
Some canisters have liquid drain openings; some do
not. If canisters are completely removed from the
container, liquid nitrogen may remain in the canister or
drain from the bottom. When removing canisters, stop
briefly at the necktube to allow the liquid to drain
completely, then handle the canister carefully to prevent
personal injury.
When room temperature product is added, slowly lower the

Operation (cont.)
canister into the refrigerator to reduce the boiling of refrigerant
and the surge of cold nitrogen gas. When inserting the
canister, tilt the bottom of the canister in the direction of the
index ring notch. The numbers on the index ring notches are
a convenient aid to inventory control.
by a seal or lock through tabs on the edge of the lid assembly.
When the lid is closed, insert the seal through the
access slot located opposite the hinge.
Securing contents - Refrigerator contents may be secured
Specifications
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Refrigeration Construction
A cryogenic refrigerator is really two containers, one within
the other. High-technology is used in a sealed vacuum
space between inner and outer containers. The integrity of
the vacuum is the key to continued performance.
All refrigerators fail eventually. A perfect vacuum system
that does not leak cannot be achieved. Some minute
leakage of air molecules into the vacuum occurs from the
moment of manufacture. A “Vacuum Maintenance System”,
consisting of materials, is built into the vacuum space to
prolong the service life of the container by many years. The
Vacuum Maintenance System can intercept these trace
leaks of air molecules only up to a point. Then the vacuum
will become less efficient and nitrogen will boil off more
rapidly.
The most frequent cause of vacuum failure is abuse. The
inner container is supported by the necktube, which supports
the weight of the liquid contents as well. A blow to the
refrigerator may cause the necktube to deform or break. Any
unit subjected to physical damage may fail more rapidly
than one that has been carefully handled.
Routine Care & Maintenance
Ice accumulation inside the necktube is caused by condensation
of moisture in the air. If ice-build up interferes with
normal operation of the refrigerator, the unit should be
emptied and thawed. To thaw the unit, pour out the liquid,
disposing of it out-of-doors where the cold liquid will not
damage driveways and other surfaces. Warm the refrigerator
by purging it with a stream of room-temperature air.
Continue purging with air even after the refrigerator is
warmed to evaporate any collected moisture. When the
refrigerator is ice-free and dry, rinse the inner vessel with
household bleach. Wash the inner vessel with solution (40
to 1 water to laundry detergent). Rinse and dry inside and
out thoroughly before placing the container back into
service.
DO NOT attempt to fasten any device to the refrigerator.
Welding, brazing, or piercing of the refrigerator in any
manner will cause permanent damage and will void your
warranty.
Check liquid levels regularly. If high evaporation rates are
apparent under normal operating conditions, the refrigerator
may be losing its vacuum. Sweating or freezing of the
outside casing are definite indications that the insulation
integrity is not normal. Read the Handle with Care booklet
(TW-10) for more information on the proper handling of your
cryogenic refrigerator.
Transportation
Although these refrigerators are rugged, they can be
damaged if abused or otherwise mishandled. When moving
or transporting a refrigerator, take every precaution to
prevent sliding, tipping, bumping or dropping the unit.
Refrigerators containing liquid nitrogen must never be
transported in unventilated compartments. Ventilation must
be assured to prevent the displacement of air and the
related suffocation hazard.
Ordering Information – Order all replacement parts and
accessories from your distributor. Please include the part
and model number of your refrigerator, the part number,
quantity, and description of each part requested. For
more information or the name of your local distributor,
contact Taylor-Wharton at the address listed.
Taylor-Wharton
4075 Hamilton Boulevard
Theodore, AL 36582
Phone (334) 443-8680
Fax: (334) 443-2250
In U.S. and Canada: (800) TW TANKS (898-2657)

Replacement Parts
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Common Parts (for all models unless otherwise specified)
Lid R033-9C11 Warranty Label R033-9C42
Lid Hinge Pin (2 required) 6550-1000 Handle (12HCL) R010-5C11
Lid Hinge Pin Retainer 8956-1013 Handle Pin (12HCL) 6560-1006
Warning Label R033-9C28 Handle Pin Retainer (12HCL) 8830-6309
Accessories
The following accessories are available for HC Series
Refrigerators:
§ A Roller Base with ball bearing swivel casters to
provide convenience and portability within a working
area where frequent container movement is necessary
and desirable.
P/N R018-8C00…………......for 12HCL and 20HC
P/N R033-8C00……………...for 21HCL, 34HC, 35HC
35VHC, and 36VHC
§ A Necktube Freezer Tray for use with 35HC and
35VHC refrigerators. This device may be used to cool
limited quantities of material at varying controlled
temperatures.
§ A Liquid Level Measuring Rod that is graduated in both
inches and centimeters. This accessory is inserted into
the cryogenic refrigerant to determine the actual liquid
level.
P/N R033-8C11 …………….for all units
§ A Low Liquid Level Alarm for all passive monitoring of
refrigerant level. This battery powered alarm is available
for units that may be used for long term storage, where an
unusual low liquid could go unnoticed.
P/N R034-8C15 …………….for 34HC
P/N R037-8C15 …………….for 35HC
P/N R036-8C30 …………….for 35VHC
P/N R038-8C15 …………….for 36VHC
P/N R036-9C27 …………….for 35HC and 35VHC
§ A 7 th Canister is available to increase the vial or
straw storage capacity of your container by 23% for
the 35HVC and 21% for the 36VHC.
P/N R036-9C27 …………….for 35VHC
P/N R038-9C27 …………….for 36VHC
Dimension Drawings
12HCL
21HCL
20HC

Dimension Drawings
34 HC
35 HC
35 VHC 36 VHC
Taylor-Wharton
4075 Hamilton Blvd.
Thoedore, AL, 36582
Phone: (334) 443-8680
In U.S. and Canada (800) TW TANKS (898-2657)
Fax: (334) 443-2250