Danfoss AK-CC 550 User Manual

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).

Danfoss AK-CC 550 Specifications

General

Brand	Danfoss
Model	AK-CC 550
Category	Controller
Language	English