Technifab Products Cryogenic Tank Switcher User manual

LT-33020(2) ©2013 Technifab Products, Inc. 1
Technifab Vacuum Jacketed
Tank Switcher
Installation Manual

LT-33020(2) ©2013 Technifab Products, Inc. 2
Table of Contents
Safety ......................................................................................................3
Layout Diagram.......................................................................................3
Components Included..............................................................................4
Installation and Setup..............................................................................9
Alarm Output.........................................................................................7
Troubleshooting.......................................................................................8
Specifications ..........................................................................................9
Support Information.................................................................................9
This document covers the installation of Technifab’s Vacuum-Jacketed Tank
Switcher. Additional information for initial startup and system operation is
included in the Owner’s Manual, Technifab part number LT-33013.
Symbols Used in this Manual
Warning - indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
Caution - indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury. It may also be used to alert
©2013 Technifab Products, Inc. All rights reserved. No part of this manual may be
reproduced, transcribed, stored in a retrieval system, translated into any language or
transmitted in any form or by any means, electronic, mechanical, photocopying,
recording or otherwise, without the expressed written permission of Technifab
Products, Inc.

LT-33020(2) ©2013 Technifab Products, Inc. 3
Layout Diagram
Safety
Caution - Care should be taken around safety relief valves and gas vent line outlets
in case cold cryogenic gas or liquid should ever be expelled.
Caution - Technifab Products Inc. recommends routing the discharge lines from
pressure relief devices to a safe place of discharge. The outlet of the discharge line
should not be in a location where it could injure people or damage anything should
cold cryogens be expelled.
Consult the Cryogenic Equipment Safety and Handling Guide, Technifab part
number LT-30084, for additional cautions and warnings of your cryogenic liquid
system.

LT-33020(2) ©2013 Technifab Products, Inc. 4
Components Included
Liquid Level Sensor
Bayonet ClampsControl Box Control Cable
Tank Switcher Manifold Assembly with Junction Box
Note: Most tank switchers include a cryogenic inlet filter installed inside the inlet
female bayonets. You should use an orange colored bayonet clamp (two shown) to
indicate inlet filters inside the bayonet connection. Please check your shipping
document for a complete list of components included.

LT-33020(2) ©2013 Technifab Products, Inc. 5
Installation and Setup
A sketch or layout diagram of the system may help you when installing the
components. The component locations will be determined by the tank inlet hoses,
the tank switcher outlet connection, and the distance to the control box. The Tank
Switcher Manifold Assembly also needs a mounting structure and a place to
mount the control box.
1. For most systems the tank switcher
manifold assembly should be mounted
using channel steel and clamps around
the vacuum jacketed pipe section. The
tank switcher mounting needs to be
capable of holding a minimum of 150 lbs
(70 kg). 13/16” channel steel strut should
be large enough to support the manifold.
The photo shows an example of a well mounted tank assembly. Be sure to
mount the manifold in three places (shown with arrows on in the photo), one
clamp on each of the three ‘legs’.
2. The Control Box can be located up to 5
meters (16 feet) from the Tank Switcher
Manifold with the standard cable. Other
length cables are available from Technifab.
Refer to the specifications section for the
control box electrical and temperature
requirements.
3. Mount the control box using the holes, four total, at the
top and bottom of the control box. Connect the control
cable to the bottom of the control box and to the junction
box on the manifold assembly, using proper cable
routing/mounting as needed. The control box comes with
a standard NEMA 5-15R male power connector at the
end of the cable. Do not plug the unit in at this time.

LT-33020(2) ©2013 Technifab Products, Inc. 6
3. The liquid level sensor height is set to the
proper level at the factory using the
compression bushing. If the liquid level
sensor is not already installed, put it into
the manifold assembly and tighten the
compression fitting.
5. Connect the cables to the manifold
junction box. Inlet valve solenoid cables
are marked on the left side and may
continue to the top right for a 6 tank
switcher. The liquid level probe and the
pressure transducer cables are connected
on the right side from the bottom up.
6. Hookup the inlet and outlet piping to the
manifold. If the tank switcher inlets have
inline cryogenic filters, be sure to use the
supplied orange clamps to identify the
inline filter inside the bayonets. The
standard bayonet on the tank switcher uses
a wing-nut clamp; hand tighten the
wingnut until the clamp is firmly mounted.
Note: If the outlet is being connected to a Techniguard vacuum jacketed pipe system
you may want to refer to LT-30121, the Techniguard System Installation Manual for
B-Series and R-Series VJP, which covers bayonet and vacuum-jacketed pipe
installation in more detail.
Installation and Setup(continued)

LT-33020(2) ©2013 Technifab Products, Inc. 7
Alarm Output
The Tank Switcher can trigger an external device such as
an auto dialer or alarm. This connector (far right in the
photo) requires a 2-pole plug available from Technifab.
The Tank Switcher sends a 24 volt DC signal when all
tanks have been depleted.
The pin closest to the notch in the connector is the
ground and the positive terminal is furthest away (see
photo). Refer to the specifications section for electrical
signal specifications.
24Vdc Neg. (-)
24Vdc Pos. (+)
The tank switcher utilizes air-actuated valves that will use either shop air or
process air. Many tank switchers use process air, which is preconfigured at the
factory. For shop air the Pneumatic Actuated Valve Guidelines, Technifab part
number literature LT-35569, has a more complete description of the differences
and shop air requirements. From LT-35569 the shop air requirements are:
 Maximum pressure 250 psig (17 Bar).
 Minimum pressure 50 psig (3.4 Bar).
 5 SCFM (2.4 nl/s) minimum flow rate at the delivery point.
Perform a final check to ensure that all electrical connections are correct and that
the fittings and the bayonet connections are tight. The unit can then be plugged in
and the valves turned on to look for any leaks.
At this point you should refer to the Tank Switcher Owner’s Manual, LT-33013,
for more information on operating the unit.
Note: Test the system from a warm fill situation to make sure an alarm situation does
not occur, especially if being used with biological freezers.

LT-33020(2) ©2013 Technifab Products, Inc. 8
Troubleshooting
1Refer to LT– 38213, Inline Cryogenic Filter Instructions, for cleaning or replacement.
If the problem continues contact Technifab Products, Inc for further assistance.
Problem Action
System will not power up or
screen is dark  Check electrical supply to make sure there is power to the unit.
 Unplug/ reset the Control Box by unplugging
the unit.
Unit switches to next tank before
active tank is empty.  Check to make sure all cables to inlet valves are connected. A small LED in the solenoid
connector indicates the valve should be on.
 If the pipe system is at room temperature, It
takes longer to deliver liquid nitrogen. Press
the onscreen Run/Stop button, press the
onscreen reset button, and press the Run/Stop
button again. A longer Switcher Timer SP
setting may be necessary.
Error message on screen  Check all wires and connectors.
 On Initial Setup an error may display
“RGEF130: Input Data error”. This is caused
either by wires not attached correctly or the
value is too low to read by the PLC. Press “X”
and continue to monitor system closely.
Slow fill  Check supply dewars for liquid and pressure.
 Check the screen to make sure the “Active”
light is on for a tank that has liquid nitrogen
and the tank valve is open.
 Make sure the tank switcher inlet filter (if
equipped) is not plugged or clogged. 1
No fill  Check to make sure the active tank has liquid
nitrogen and is turned on.
 Make sure the tank switcher inlet filter (if
equipped) is not plugged.1

LT-33020(2) ©2013 Technifab Products, Inc.
9
Maximum Pressure 30 psig (2.0 Bar)
Manifold Dimensions
(2 Tank Version) 29.5” wide x 29” high x 23” deep (75 cm x 74 cm x 59 cm)
Control Box Dimensions 11.5” wide x 13.5” high x 6” deep
(29.2 cm x 34.3 cm x 15 cm)
Control Box Operating Temperature 32°F - 122°F (0°C - 50°C)
Enclosure and Penetrations Rating NEMA 4X, IP65
Power Requirements 110-240 VAC, 50-60 Hz
Power Usage 200 watts @ 110 VAC nominal
1.7 amp maximum
Alarm Output 24 VDC
0.2 amp max current
Product Specifications
Technifab Cryogenic Tank Switcher
Support Information
Technifab continuously seeks to improve its products. Customer feedback
is an essential element of this process. Should any issue arise regarding
this product’s performance, please immediately notify:
Technifab Products, Inc. - Quality Department 812.442.0520
10339 N. Industrial Park Drive 812.442.0891 Fax
P.O. Box 315 [email protected]
Brazil, Indiana 47834 USA www.technifab.com
Distributed by PrincetonCryo.com | 800-232-2796 | [email protected]