Specifications

RK0YG302 © Danfoss 05/2007 25
AKC 25H7
AKC 25H7 is a complete brine cooler control unit that has been
developed for indirect refrigerating systems in supermarkets.
The controller’s main function is to control compressors and
condensers in such a way that the required brine temperature is
maintained on the cold and warm side of the compressor system.
The controller contains all the functions required for the control of
a brine cooler:
• The cold brine temperature can be controlled according to the
shop temperature or the enthalpy
• Day/night programmes for the temperature reference (economy
control)
• Alarm limits and delays on forward and return ow temperatures
• Capacity control and monitoring of compressors distributed on
one or two groups
• Sequential control or time equalisation of compressors
• Frost cutout for monitoring of suction pressure P0
• Peak load limitation via external signal
• Central defrost control or weekly programme (stop based on
temperature or time)
• Signal given when injection is permitted
• Control and monitoring of single pump or twin pump on cold
and warm brine
• Built-in rotation between twin pumps
• Automatic pump change when pump is defective
• Control and monitoring of air-cooled or brine-cooled condenser
Application example
• Condenser can be controlled based on pressure (Pc) or warm
brine temperature (S7)
• Monitoring of max. condensing pressure
• Step regulation or speed regulation of fans
• Condensing pressure can be controlled according to outdoor
temperature and an external voltage signal
• Control of heat recovery temperature with built-in safeguard
against too low condensing pressure
• Heat recovery temperature can be controlled according to
outdoor temperature and an external voltage signal
• Monitoring of the compressors’ safety circuit can be
supplemented with alarm module type AKC 22H
Additional information!
Function description: RC1NP
Water chiller control
AKC 25H7