KA IMO 2021 6 V2.1

42 systemair
3.5 Heat recovery units
3.5.1 Plate heat exchanger
Caution
See also section 3.1 General instructions.
See the values in the selection program data and on the nameplate.
Commissioning
• Priortostartingthesectionup,checkthetightnessofthethreadedjointsandtightenthemifrequired.Alsocheck
the correct installation and connection of the control dampers with the damper electric motor drive, as well as the
damper operation.
• Makesuretoallowforunobstructedremovalofthewaterdropleteliminatorfromtheairhandlingunitcasing.
• Makesuretoinstallanadequately-sizedsyphoninthecondensatecollectionanddrainingpandischargepipe.The
instructions for the construction, installation and connection of syphons are provided in Section 2.3.5 Connection of
syphon.
Maintenance
Regularly clean the plate heat exchanger. Fouling of the insert increases the pressure drop and decreases the
efciency.
Asimplewaytocheckforplateheatexchangerfoulingistoremovethecoversontheservicesideandinspectthe
cleanliness of the insert front surfaces, and, with the aid of a torch lamp, also the cleanliness of the air channels
through the insert.
If the insert contamination consists of dry dust, the insert can be cleaned without disassembly through the service
openings:
• Withcompressedair(amaximumof10barofpressure);inthisoperation,theuseofpersonalprotectiveequipment
is obligatory.
• Iftheinsertcontaminationconsistsofgreasyorstickydebris,slideouttheinsertfromtheheatexchangersection
casing and clean it with a jet of hot water (temperature up to 90 °C, a maximum pressure of 6 bar) with an
appropriate cleaning agent added.
• Thecontaminationmayalsoberemovedbymeansofsoakinginwarmwaterwithadetergentadded.
Disassemble the insert from the casing:
• Rremovethepartitionprolesontheservicesidebyundoingthemountingscrews,
• removetherubbergasket,
• undothetopguideprolemountingscrews,whileonlylooseningthesideguidingproles,andthenremovethe
topguideprole,
• slide out the insert from the section casing,
• replace the cleaned inserts in the section in the reverse order of the mentioned steps.
Caution
Sincetheinsertllermaterialismadeofaverythinaluminiumfoil,becarefulnottodamagethefront
surfaces of the insert when disassembling.
With any maintenance or inspection intervention, also clean the condensate discharge at the bottom of
the pan and top up the water in the syphon.