Eppendorf LN2 Backup System - Manual (Page 18)

Installation
New Brunswick LN2 Back-up System
English (EN)
18
6.6.2 Solenoid valve installation for chest freezers
The port for the solenoid assembly is located inside the upper right-hand side of the compressor
compartment.
1. Make sure the manifold-to-injector transfer line assembly passes through the port in the rear panel of
the freezer and the solenoid valve cable to the control unit passes through the grommet on the upper
rear panel.
2. Install the solenoid valve assembly to the port inside the compressor compartment as described in steps
1 through 6 for Upright Freezers.
6.7 LN
2
gas supply installation
1. Position the LN
2
Dewar within 1 meter (3.3 ft) of the freezer. To prevent injury or equipment damage,
secure the Dewar to make sure it cannot fall or roll.
2. Connect the insulated transfer line to the regulated liquid withdrawal port of the LN
2
Dewar.
6.8 Test for gas leaks
Before continuing with installation, ensure there are no gas leaks with the following procedure:
1. Ensure all fittings are tight before testing.
2. Apply liquid soap solution on each joint.
3. Turn LN
2
on.
Bubbling or foaming will identify leaks.
4. Retighten the fitting or replace the seals if necessary.
The transfer line connector is 3/4 inch - 16 UNF, female union. Two transfer line adaptors are
also supplied, 1/2 and 3/8 inch NPT, to adapt the transfer line to the supplied Dewar if
necessary. Before installation, verify, with your local gas supply company, the correct adaptor
to use with the supplied Dewar.
WARNING! Failure of system
 Check for leaks to avoid failure of system