Reassembly; Plate Types - CIAT ITEX Manuel D'instructions

ENGLISH
N.B. Some particular standards (e.g. ACS Attestation de Con-
formité Sanitaire) may prohibit direct contact between fl uid
and glue. If this is the case, do not glue the parts of the ga-
sket which could come into direct contact with the fl uid.
WARNING: Always follow the mandatory general standards
for personal protection, in particular: avoid contact with the
eyes, use an appropriate protective mask to protect against
inhalation hazards and wear gloves.

5.8 - Reassembly

• Before reassembling the heat exchanger, make sure that all
the plates and gaskets are clean and free of grease.
• When arranged correctly, the stacked plates form a ho-
neycomb pattern (Fig.10).
• The order of assembly and the plate direction are specifi ed
on the plate arrangement drawing.
Procedure
• Starting from the frame plate, assemble the plates on the
bar one by one with the gaskets facing the frame plate.
• Clean and lubricate the tie-rods, position them on the fra-
me, then tighten the nuts gradually and evenly in the order
indicated in Fig. 11 until the correct dimension is obtained
between the plates (tightening dimension), as specifi ed on
the nameplate. Check that this dimension is the same on
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each side. Overtightening may irreversibly distort the pla-
tes. If you feel it is necessary to tighten beyond the recom-
mended dimension,contact CIAT's After-Sales Department
to obtain advice.
Fig.11
Fig.10
• It is recommended to perform a pressure test after all main-
tenance on the plates and gaskets in order to check the
heat exchanger's internal and external tightness. The maxi-
mum pressure for each circuit should be equal to the ope-
rating pressure and should never exceed the rated pressure
(PS) specifi ed on the nameplate. The recommended testing
time is at least 10 minutes. Nevertheless, it remains the
user's responsibility to check national standards and local
codes affecting such a test. If different test conditions are
required, please note that the heat exchangers should ne-
ver be tested at pressures greater than the test pressure
(PT) specifi ed on the nameplate and that the pressure diffe-
rences between the two circuits during testing should never
be higher than the maximum allowable differential pressure.
• If a leak occurs, lower the pressure then retighten the nuts
and repeat the test. If the leak persists, check the gaskets
and plates for signs of wear, damage or dirt. If necessary,
replace the gaskets.

5.9 - Plate types

A
B
The letter indicates the plate type:
A = HIGH EFFICIENCY plate with wide chevron pattern
B = LOW DELTA P plate with narrow chevron pattern
ENGLISH
PORT HOLES FOR PLATES ON SINGLE-PASS UNITS
ODD EVEN ODD ODD PORT HOLES
DESCRIPTION
INITIAL INTERMEDIATE INTERMEDIATE FINAL POSITION
PARALLEL
FLOW
CODE
1 2 3 4 1 2 3 4 1 2 3 4 0
PORT HOLES POSITION FOR DEVIATION PLATE PORT HOLES POSITION FOR DEVIATION PLATE
1,2,4 1,3,4 1,2,3 2,3,4 1,4 2,3 3 3
Drilling the collectors. Code which indicates the position and the open or
closed status of the collectors.
1234 = Open 0 = Closed
e.g.: 1204: indicates that porthole No. 3 is closed.
EN
PASSING
HOLES
BLIND
HOLES
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