Danfoss AK-CC 550 - Page 13

AK-CC550 Manual RS8EN502 © Danfoss 02-2010 13
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Thefollowinguseshavesomespecialfunctions
which in brief are:
Application 5
”Two-compressor”operation.
The two compressors must be of the same size.
Onstart-up(afterdefrosting,operationalstop,
etc.)bothcompressorsarestartedwithasettime
shift.Onecompressorstartsathalfthedierential
so that an optimum adaptation of compressor
capacitytakesplaceforthecurrentloadinthe
appliance/room.Thereisautomaticruntime
equalisation between the compressors.
Foramoredetaileddescriptionpleasereferto
earlier sections in the manual.
Application 6
Hotgasdefrosting.
Hotgasdefrostingisadaptedtocommercial
appliances/roomswithlimitedsystemlling.
Onerelaycontrolsthemainvalveinthesuction
line.
Achangeoverrelaycontrolsboththehotgas
valveandthedrainvalve.
This means that there is no time delay between
stops of hot gas and start of draining.
Application 7
Control of night blinds
Night blinds follow the status of the light function
– when the light is switched on, the night blinds
areupandwhenthelightisswitchedo,the
nightblindsaredown.Inadditionadigitalinput
providestheoptionofforcedopeningofthe
blindssothattheappliancecanbelledwith
products.
Application 8
Heatthermostat
The heat thermostat is typically used if the
temperature is to be controlled within narrower
limits, e.g. for cutting rooms, etc. The heating
thermostatcanbesetasadierenceinrelationto
the cutout limit for the refrigeration thermostat so
that simultaneous refrigeration and heating are
avoided.
Application 9
Two refrigeration sections – two defrost outputs
This application is for refrigeration appliances with
onevalve,twoevaporatorsandtworefrigeration
sections. The temperature is controlled and is
alwaysalarmmonitoredaccordingtotheS4
temperature.Forthistheproductsensorisusedas
adefrostingstopsensorforevaporatorno.2.
Application 10
Tworefrigerationsections–individualalarm/
displayviaS3
This application is for refrigeration appliances with
onevalve,oneevaporatorandtworefrigeration
sections. The temperature is always controlled
accordingtotheS4temperature.Theproduct
sensorisusedasanextraS3sensorforsection
no.2.Alarmmonitoringanddisplayreadingstake
placeindividuallyviathe"S3"sensorsineach
refrigeration section.