Taylor TW-357 - Manual (Page 9)

TW-357 REV E
9
INSTALLATION
Unpacking and Inspection
Inspect shipping containers for external damage. All claims for damage (apparent or concealed) or partial loss
of shipment must be made in writing within five (5) days from receipt of goods. If damage or loss is apparent,
please notify the shipping agent immediately.
Open the shipping containers; a packing list is included with the system to simplify checking that all
components, cables, accessories, and manuals were received. Please use the packing list to check off each item
as the system is unpacked. Inspect for damage. Be sure to inventory all components supplied before discarding
any shipping materials. If there is damage to the system during transit, be sure to file proper claims promptly
with the carrier and insurance company. Please advise Taylor-Wharton of such filings. In case of parts or
accessory shortages, advise Taylor-Wharton immediately. Taylor-Wharton cannot be responsible for any
missing parts unless notified within 60 days of shipment.
Repackaging for Shipment
If it is necessary to return any part of the system for repair or replacement, a Material Return Authorization
(MRA) number must be obtained from an authorized factory representative before returning the instrument to
our service department. Contact your distributor for return authorization. When returning an instrument for
service, the following information must be provided before obtaining an MRA:
A. System model and serial number, and controller serial number
B. User’s name, company, address, and phone number
C. Malfunction symptoms
D. Description of System
If possible, the original packing material should be retained for reshipment. If not available, consult Taylor-
Wharton for shipping and packing instructions. It is the responsibility of the shipper to assure that the goods
are adequately packaged for return to the factory.
Liquid Nitrogen Supply Connection
The package included with the refrigerator includes a strainer. The liquid fill hose from a low pressure source
of liquid nitrogen must be connected to the inlet through this fitting. This liquid nitrogen source must have a
shut-off valve, and may be any portable liquid cylinder or a bulk supply. The liquid nitrogen supply pressure
at the inlet to the refrigerator should be in the range of 10 psig (0.7 bar/69 kPa) to 20 psig (1.4 bar/38 kPa) for
optimum performance. Higher operating pressures will increase transfer losses and create excessive turbulence
of the liquid in the refrigerator which can generate false signals to the liquid level controller causing the
refrigerator to under-fill. In “liquid phase” storage applications, excessive turbulence can cause splashing
which could result in personal injury and/or damage to the refrigerator. If the liquid nitrogen supply pressure
at the inlet to the refrigerator rises above the opening pressure of the relief valve on the refrigerator, liquid
nitrogen will be discharged into the surrounding area which can cause a rapid and very dangerous depletion of
oxygen in the atmosphere. Once this pressure relief device has opened and cooled to liquid nitrogen
temperature, it will not reseat until it has warmed to near ambient temperature. THIS COULD PERMIT THE
ENTIRE CONTENTS OF THE LIQUID NITROGEN SUPPLY SYSTEM TO BE DISCHARGED INTO
THE IMMEDIATE AREA OF THE REFRIGERATOR(S) .
WARNING: In order to prevent the relief device on the nitrogen refrigerator(s) from opening when the
system is in operation, the liquid nitrogen supply system must be protected by a pressure relief device
that will open when the pressure at the inlet to the refrigerator(s) is approximately 22 psig (1.5 bar/152
kPa). Never install the supply system pressure relief device onto a liquid service line.