ROUTINE MAINTENANCE
To preserve the life and efficient operation of the equipment it is important that the
equipment is properly maintained. Regular servicing/maintenance of the equipment is
the responsibility of the end user and must be performed by qualified personnel who
understand the operation of the equipment.
In particular it is essential to ensure that the clean in place procedure is carried out
after every use, as described in the operational procedures section.
Note: De-ionised water should be used when filling the hot water circulator
FT60 MkII. It may be necessary to add a small quantity of potassium
bicarbonate in order to ensure the correct operation of the level switch
(conductivity probe). When first used, brown staining of the flexible
tubing to the hot water circulator may occur and is no cause for
concern.
DISMANTLING AND RE-ASSEMBLY OF THE PLATE HEAT EXCHANGER.
Refer to diagrams on pages 47, 48 and 49.
Cleaning the heat exchanger “in place” according to the instructions in this section
will normally prevent the necessity for manual cleaning.
Note: It is important to minimise the number of times that the exchanger is
dismantled because this will affect the life of the gaskets. Even heavy
soiling can usually be broken down by suitable reagents and rinsed out
and this is always preferable to disassembly.
The Plate Heat Exchanger is made up of stainless steel plate and silicone gasket
combinations which are assembled in certain orientations to allow various flow
patterns of product and heat transfer media through the exchanger.
Each plate and gasket combination has an identification number (PE number) which
is etched onto the plate on the gasket side.
The diagrams on the following pages describe the order in which each of the
identified plates is installed, working from the fixed end plate (heating section end).
There are three sections making up the heat exchanger: the interchange section, the
heating section and the cooling section. Each section consists of a series of plates
clamped between two stainless steel endplates. The advantage of this design is that
there are, in effect, three heat exchangers incorporated on the same framework instead
of three independent heat exchangers connected together by pipework.
A safety cover made from stainless steel is placed over the heat exchanger covering
the plates and gasket. This is to ensure no injury is sustained from any hot substances
escaping should a gasket fail.
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