Danfoss AKA 245 Dokumentacja Pobierz pdf (Strona 6)

6 Manual RS8EN502 © Danfoss 02-2010 AK-CC550

Hotgasapplication

Defrost

Depending on the application you may choose between the fol-

lowing defrost methods:

Natural: Herethefansarekeptoperatingduringthedefrost

Electric: Theheatingelementisactivated

Hotgas: Herethesolenoidvalvesarecontrolledsothatthe

 hotgascanowthroughtheevaporator

Defrost sequence

1)Pumpdown

2)Defrost

3)Waitingpositionafterdefrost

4)Draining(draindelay.Hotgasonly)

5)Dripo

6)Delayoffan

Hot gas defrost (application 6 only)

This type of connection can be used on systems with hotgas

defrost,butonlyinsmallsystemsin,say,supermarkets–the

functional content has not been adapted to systems with large

charges

Relay2isusedforsuctionvalve

Relay4’schange-overfunctioncanbeusedbythebypassvalve

and/orthehotgasvalve.

MustnotbeusedtogetherwithPMLXandGPLXvalves,unlessa

timedelayrelayisinstalled,whichensuresthatthePMLX/GPLX

valveisclosedcompletelybeforethehotgasisturnedon.

Drip tray heating element

Itispossibletocontrolaheatingelementinthedriptrayfor

hotgasdefrosting.Whendefrostingiscommenced,theheating

elementisactivated.Theheatingelementremainsactivateduntil

a set time after defrosting has ended by time or temperature.

Start of defrost

Adefrostcanbestartedindierentways

Interval:Defrostisstartedatxedtimeintervals,say,every

eighthhour.AnintervalmustALWAYSbesetto

a"higher"valuethantheperiodsetbetweentwo

defrostingswhenascheduleornetworksignalisused.

Refrigerationtime:Defrostisstartedatxedrefrigerationtime

intervals,inotherwords,alowneedforrefrigerationwill

”postpone”thedefrost

Schedule:Heredefrostcanbestartedatxedtimesofthe

dayandnight.However,max.6times

Contact: Defrost is started with a contact signal on a digital input

Network:Thesignalfordefrostisreceivedfromasystemunit

 viathedatacommunication

Adaptivedefrost:Heredefrostingisstartedbasedonintelligent

registeringofevaporatorperformance.

Manual:Anextradefrostcanbeactivatedfromthecontroller’s

lower-most button

Allthementionedmethodscanbeusedatrandom–ifjustof

themisactivatedadefrostwillbestarted.

Stop of defrost

Defrosting can be stopped by either:

•Time

•Temperature(withtimeassafety).

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