Disassembly - Riello SP20-DN32 Manuel D'utilisation Et D'entretien

ENGLISH
Short-term storage (< 3 months)
1) Gradually lower the pressure in each circuit.
2) Turn off the pumps and close the shut-off valves, starting
with the hot circuit and then the cold circuit.
3) Let the heat exchanger cool to room temperature.
4) Completely drain the heat exchanger and close the drain
and vent valves.
Long-term storage (> 3 months)
Carry out the above steps as well as the following:
1) Flush the heat exchanger circuits with water to remove all
residue.
2) Loosen the nuts on the tie bolts to reduce the compression
on the gaskets.
3) Apply a rust preventive on the tie bolts.
4) When recommissioning the heat exchanger, lubricate the
tie bolts and guide bars then go to section 4.1.
5) Retighten the plates to the dimension shown on the name-
plate.

5.2 - Disassembly

• Breaking the special quality strap around the heat exchang-
er will void the warranty. You must obtain RIELLO's written
permission in order to remove the strap.
• Store the plates on a flat, clean surface away from ferrous
particles and dirt.
• For easier reassembly, stack the plates in the order of as-
sembly or number them.
42
Procedure
1) Disconnect the pipes at the back of the frame (multi-circuit
units).
2) Clean and lubricate the tie-rods.
3) Measure the tightening dimension.
4) Loosen all the nuts in the order shown in Figure 11 (page
20). Pull back the movable follower and carefully remove
the plates one by one so as not to damage them.Wear
protective gloves while doing so as the edges of the plates
are sharp.
5) Remove the gaskets by lifting the tabs out of their slots on
the edges of the plates.
6) Clean the heat exchanger.
• Separate the plates with care, paying particular attention to
the fastening of the Plug-In® gaskets; the gaskets tend to
stick to the plates after a period of prolonged operation at
high temperatures. Gaskets that retain their original proper-
ties may be reused.
• Never mix new and old gaskets as the difference in elastic-
ity will result in overcompression of the new gaskets and
reduce their service life.