Introduction; Application - Danfoss ADAP-KOOL AK-HP 780 Design Manual

Application

AK-HP 780 is a complete heat pump regulating for capacity
control of compressors and temperature regulating of a receiver.
The controller is with oil management, making it suitable for CO2
plants.
The controller's main function is to control compressors and
pump, so that operation all the time takes place at the energy-
optimum pressure conditions. Both suction pressure and dis-
charge pressure are monitored with the belonging safety function
and alarm function. Capacity control can be carried out by media
temperature Sctrl and S7.
Among the different functions are:
- Capacity control of up to 8 compressors
- Up to 3 unloaders for each compressor
- Oil management. Either shared or individual for all of the com-
pressor's oil valves. Receiver pressure control.
- Speed control of one or two compressors
- Up to 6 safety inputs for each compressor
- Option for capacity limitation to minimize consumption peaks
- Safety monitoring of high pressure / low pressure / discharge
temperature
- Capacity control of a pump. Either On/Off or speed control
- Safety monitoring of pump flow
- The status of the outputs and inputs is shown by means of light-
emitting diodes on the front panel
- Alarm signals can be generated directly from the controller and
via data communication
- Alarms are shown with texts so that the cause of the alarm is
easy to see.
- Plus some completely separate functions that are totally in-
dependent of the regulation – such as alarm, thermostat and
pressure control functions, safety functions at cold start up, P0
limitation.
SW = 1.4x
AK-HP 780

1. Introduction

Heat pump controller RS8GF202 © Danfoss 2015-08
Example
Compressor control
Pump control
Oil management
3