Fuses, Routine safety tests – Grant Instruments LTC4 User Manual
Page 34
31115 V1
LTC4
Page 33
Operating Manual
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. 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.
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
R4
5AT
R4L
10AT
Fuse replacement should only be carried out by a competent person.
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 230V mains cables must have the following markings;
70°C for the R unit and
carry 10A. The mains plug and IEC connector must carry approvals from a European
certification body (e.g. BSI, VDE or equivalent).
The LTC4L (120V) refrigeration units 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.