Fuses, Routine safety tests – Grant Instruments LTC2 User Manual
Page 21
LTC2
30933 V2
Operating Manual
Page 20
www.grantinstruments.com
Clean the outside of the equipment with a damp cloth, using water only. Do not use
chemical cleaning agents. Before using any other cleaning or decontamination method,
check with Grant Instruments or your local representative to make sure that the proposed
method will not damage the equipment. Scale on immersed parts can be removed using
chemical de-scaling products designed for use on equipment that has metal parts.
De-scaling products may be toxic and manufacturer’s instructions should
always be followed
9.3
Fuses
The control unit fuses are internal and should not need to be replaced. Please contact
the Grant Instruments service department if the unit has a fuse fault.
The refrigeration unit has externally accessible fuses that can be changed by a qualified
technician. Disconnect the unit from the power supply socket. For the 220-240V unit
only, remove the IEC power plug from the rear of the unit. Press down the fuse drawer
catch and pull out. Check fuses and if necessary replace. Push the fuse drawer back in
until fully engaged and replace the IEC plug.
For the 110-120V unit, twist the fuse holder cap anticlockwise to release the fuse. Check
fuse and if necessary replace. Refit the fuse in the unit and twist clockwise to secure.
Repeat for the second fuse.
Replacement fuses must be 1.25” x 0.25” anti surge ceramic type with the rating defined
in the following table:
R unit
Fuse rating
R2
15AT
R2L
5AT
9.4
Replacing the mains cord
Any replacement mains cords used for the control unit or refrigeration unit must meet the
same specification as the one originally supplied to maintain the safety of the unit.
All mains cables (including the interconnect mains cable) must have the following
markings;
and IEC connector must carry approvals from a European certification body (e.g. BSI,
VDE or equivalent).
The LTC2L (110-120V) control unit and refrigeration unit both have fixed mains cords
which should not be replaced.
9.5
Routine safety tests
If routine tests are to be made, we recommend a test of the integrity of the protective
earth conductor and an insulation test at 500V DC. Routine flash tests are not
recommended for any electrical equipment, because repeated high voltage tests degrade
insulation materials.