User Guide | Optyma™ control AK-RC 111 single phase
12 | BC309238530328en-000101 © Danfoss | DCS (vt) | 2020.03
4.14 Defrost with heater and
temperature control
4.15 Hot gas defrosting
4.16 Pump down function
5.1 Net configuration with
modbus-RTU protocol
4.17 Password function
5.0 Modbus connection
Set the parameter d1=2 for the management of heater defrost by time with temperature control.
During the defrost the output is activated when the evaporator’s temperatures are lower than d2.
Defrost stops after d3 minutes. It allows energy saving and a better defrost process.
Set parameter d1=1 to defrost in cycle inversion mode.
The compressor relay and defrost relay are activated throughout the defrost phase.
To ensure proper control of the system the installer must use the defrost output: this must allow
opening of the cycle inversion solenoid valve and closure of the liquid solenoid valve.
For capillary systems (without thermostat valve) it is only necessary to control the cycle inversion
solenoid valve via the defrost relay control.
Pump down function is activated when parameter AU1/AU2 = 4 / -4.
Connect pump down pressostat on the digital input configured as pump down (In1 or In2 = 4 / -4).
The compressor is directly controlled by pressostat. Connect evaporator solenoid valve on the AUX1
(or AUX2) relay. The solenoid is controlled directly by thermostat.
When parameter PA is setting with value different to 0 the protection function is activated.
See parameter P1 for the different protection.
When PA is setting the protection start after two minutes of inactivity. On display appear 000. With up/
down modify the number, with set key confirm it.
Use universal number 100 if you don’t remember the password.
For RS-485 connections with Modbus-RTU protocol follow the scheme below.
AK-RC 111
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