23
Contractor’s manual
F15 - F30 Generators
Manual For F15 and F30 - Mill.: 2008 - 11 / Mod. : JPM 05
Page
10. Addition of salt
The operation of a fl ake ice machine is improved by adding
sodium chloride to the water to be frozen.
Addition of salt :
- delays the formation of scale when hard water is used.
- gives larger fl akes, with less breaking up or “snow”.
- facilitates ice harvesting and minimises the forces
produced by reaction on the reamer.
In short, large fl akes of ice are produced with ‘‘smoother’’
operation.
To add the salt, two methods are proposed :
- the standard dosing system uses calibrated tablets
25 mm in diameter, as employed in water softeners
for the regeneration of resins.
- a dosing pump using a solution of purifi ed salt (fi ne
cooking salt) dissolved in water in PVC containers.
The quantity of salt consumed is indicated in the section
(Dosing Pump). 80 to 100 g of salt is added per tonne of
ice, the usual quantity, to be adjusted according to the
water quality.
- Ice which is very broken up indicates a lack of salt
which is often due to very soft water.
- Ice in very large fl akes that can be detached before
the passage of the reamer indicates too high a dosage.
Precautions must be taken in the use of these
system :
- The tablets used in the standard dosing system must
be perfectly cylindrical with at least one fl at end so
they do not jam in the vertical pipe. The position of
the latter must not be altered after fi lling. Adjustment
of
the
fl ow rate is possible but requires much care.
Monthly cleaning of the base of the dosing system will
keep it operating correctly.
- The purifi ed salt used with dosing pumps must be
dissolved in small successive quantities to ensure a
complete melting, either in cold water or preferably
hot water. Final mixing, after complete fi lling of the
PVC tank, will ensure a homogeneous solution.
A dosing tube is a system for adding salt, mounted in
series, in the case where there is no other system avail-
able for adding salt.
The dosing tube is attached by two collars to the drum of
the generator.
It consists of a clear, rigid tube closed at the bottom by a
drilled stopper held by a collar.
A small metal tongue collects water from the fl ow at the
base of the drum and conducts it to the dosing tube.
The water collected in this way penetrates between the
tube and the stopper of the dosing tube, and comes into
contact with the salt tablets.
This procedure generates a steady drip of salt water that
passes through the hole in the base n° 3.
10.1 The salt dosing tube
The dosing tube is fi tted in a corner of the base and po-
sitioned so that the base 3 is 70 mm from the bottom of
the base and the tongue is directed towards the shaft.
The n° 1 hole must engage with the head of the screw of
the top collar.
10.1.1 Adjusting the salt dosing tube
By raising base no. 3, or reducing the inclination of the
tongue no. 4, the salt consumption is reduced (and con-
versely) F15 and F30.
The dosing tube of the F30 is provided with an orifi ce
located in front of the tongue which by uncovering it in-
creases the consumption of salt (and conversely).
Important
The recommended salt consumption is given in
the Dosing Pump section.
Addition of salt
N°1 Hole
Tube
Tongue N°4
N°2 Hole / F30
Base N°3
Clamp
