Service & Maintenance; Media Filter, Nozzles - Nobel FCD 05 Instruction Manual

9. SERVICE & MAINTENANCE
Normally, these units do not require any regular maintenance operation and there is not any
consumption material to be currently replaced.
The only parts that can be aged are the electrical components and moving parts, as listed :
• the membrane of the automatic valves; after years, they can be aged and crack.
• the solenoid valves can break down (electric) or can get dirty if the pilot fluid is not
perfectly clean.
• The average life of the media filter is approx 5÷8 years, according to the chemical-phisical
characteristics of the water and how often the regeneration is featured.
The correct handling of the equipment requires :
• check monthly the values of pressure and flow rate of water, which have to comply with
stated ones.
• check that the air and/or water pressure are within the stated values.
• check that the values of pressure shown by the programmer meet the ones gauged by the
manometers (only for DP and DP-DUAL arrangement).
Not any further special maintenance operations are required.
Not any consumption material is required .
9.1.

Media filter, nozzles

Whether the filtering bed is clogged and "packed" in order that it is impossible to backwash it
properly, the replacing of the media filter is required.
Proceed as follows for the emptying :
• Switch OFF the control panel
• Close the shut-off valves upstream and downstream of .
• Empty the column of water, by opening the bottom drain valve
• Open the upper-side man-hole (or upper head)
• Open the lower-side man-hole, leaving one nut inserted in. It will allow to control the flow
of the media filter outside.
• Then open completely the lower and side man-hole. Keep the nuts and gaskets of the
man-holes.
• Flush water to take out the media filter still laying along the internal walls of the column
and on the internal nozzles.
• Complete the emptying of the column, using an aspirator, if necessary.
• During the last part of the operation, take care not to damage the nozzles mounted on the
holding plate.
• Replace the damaged nozzles, if any.
Proceed as explained at § 4.5 to load the new media filter.
Proceed as explained at § 8 to start-up the unit, after replacing of media filter.
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s.r.l.Milano - ITALY
INSTRUCTIONS MANUAL AUTOMATIC FILTERS
FCD-FACD-FFD /DT /DP /DT-DUAL /DP-DUAL
Page 20 of 23 r.4
fcd-dp_mi-r4.doc –