Installation Guide
Optyma™ control
AK-RC 111, AK-RC 113

AK-RC 113 Cold Storage Room Controller

1. Compressor protection
2. Door limit switch
3. Ambient probe
4. Defrost probe
5. RS485 Modbus
6. Supply 230 V AC
7. Defrost heater
8. Evaporator fans
9. Compressor
10. Light
11. Alarm / Aux

Function	Press
View set point
Change set point
Change menu “User level”
Return
Change menu “Installer level”
Return

List of level 1 variables (user level)

Variables	Meaning	Value	Default
r0	Temperature difference compared to main SETPOINT	0.2 – 10 °C	2 °C
d0	Defrost interval (hours) If d0 = 0 cyclical defrosts Off	0 – 24 hours	4 hours
d2	End-of-defrost setpoint. Defrost is not executed if the temperature read by the defrost sensor is greater than d2. (If the sensor is faulty defrosting is timed)	-35 – 45 °C	15 °C
d3	Max defrost duration (minutes)	1 – 240 min	25 min
d7	Drip duration (minutes) At the end of defrost the compressor and fans remain at standstill for time d7, the defrost LED on the front panel flashes.	0 – 10 min	0 min
F5	Fan pause after defrost (minutes) Allows fans to be kept at standstill for a time F5 after dripping. This time begins at the end of dripping. If no dripping has been set the fan pause starts directly at the end of defrost.	0 – 10 min	0 min
A1	Minimum temperature alarm Allows user to define a minimum temperature for the room being refrigerated. Below value A1 an alarm trips: the alarm LED flashes, displayed temperature flashes and the buzzer sounds to indicate the problem.	-45 – (A2-1) °C	-45 °C
A2	Maximum temperature alarm Allows user to define a maximum temperature for the room being refrigerated. Above value A2 an alarm trips: the alarm LED flashes, displayed temperature flashes and the buzzer sounds to indicate the problem.	(A1+1) – 99 °C	99 °C
tEu	Evaporator sensor temperature display (displays nothing if dE =1)	Evaporator temperature	read only

List of level 2 variables (installer level)

Variables	Meaning	Value	Default
F3	Fan status with compressor off	0 = Fans run continuously 1 = Fans only run when compressor is working 2 = Fans disabled	1
F4	Fan pause during defrost	0 = Fans run during defrost 1 = Fans do not run during defrost	1
F6	Evaporator fans activation for air recirculation. The fans activate for a time defined by F7 if they have not started working for the F6 time. If activation time coincides with the defrosting time, end of defrosting is awaited.	0 – 240 min 0 = (function not activated)	0 min
F7	Evaporator fans duration for air recirculation. Fans working time for F6	0 – 240 sec	10 sec
dE	Sensor presence If the evaporator sensor is disabled defrosts are carried out cyclically with period d0: defrosting ends when an external device trips and closes the remote defrost contact or when time d3 expires.	0 = evaporator sensor present 1 = no evaporator sensor	0
d1	Defrost type, cycle inversion (hot gas) or with heater elements	0 = heating element 1 = hot gas 2 = heater with temperature control	0
dPo	Defrost at Power On	0 = disabled 1 = defrost at power-on (if possible)	0
dSE	Smart defrost	0 = disabled 1 = enabled	0
dSt	Smart defrost Setpoint (if dSE=1) The counting of the time between the defrost is incremented only if the compressor is ON and the evaporator temperature is less than dSt.	-30 – 30 °C	1 °C

Variables	Meaning	Value	Default
dFd	Display viewing during Defrost	0 = current temperature 1 = temperature at the start of the defrost 2 = “DEF”	1
Ad	Modbus Network address	0 – 247	0
Bdr	Modbus baudrate	0 = 300 baud 1 = 600 baud 2 = 1200 baud 3 = 2400 baud 4 = 4800 baud 5 = 9600 baud 6 = 14400 baud 7 = 19200 baud 8 = 38400 baud	8
Prt	Modbus parity check	0 = none 1 = even 2 = odd	1
Ald	Minimum and maximum temperature signalling and alarm display delay	0 – 240 min	120 min
C1	Minimum time between shutdown and subsequent switching on of the compressor	0 – 15 min	0 min
CAL	Cold room sensor value correction	-10 – 10 °C	0 °C
CE1	Duration of compressor ON time in the case of faulty ambient probe (emergency mode). If CE1=0 the emergency mode in the presence of error E0 remains disabled, the compressor remains off and defrosting is prevented in order to conserve the remaining cold.	0 – 240 min 0 = disabled	0 min
CE2	Duration of compressor OFF time in the case of faulty ambient probe (emergency mode).	5 – 240 min	5 min
doC	Compressor safety time for door switch: when the door is opened the evaporator fans shut down and the compressor will continue working for time doC, after which it will shut down.	0 – 5 min	0 min
tdo	Compressor restart time after door opening. When the door is opened and after tdo time, it’s setted back the normal functioning giving door open alarm (Ed) If the door switch is closed and the light stays on for a longer time than tdo light cell alarm is signaled (E9). With tdo=0 the parameter is disabled.	0 – 240 min 0 = disabled	0 min
Fst	FAN shutdown TEMPERATURE The fans will stop if the temperature value read by the evaporator sensor is higher than this value.	-45 – 99 °C	99 °C
Fd	Fst differential	1 – 10 °C	2 °C
LSE	Minimum value attributable to setpoint.	-45 – (HSE-1) °C	-45 °C
HSE	Maximum value attributable to setpoint.	(LSE+1) – 99°C	99 °C
AU1	Auxiliary/alarm relay 1 control	-6 (NC) = relay de-energised during stand-by. -5 (NC) = Contact for casing element control (AUX relay closed with compressor output inactive). -4 (NC) = pump down function(NC, see CHAP 5.16). -3 (NC) = automatic auxiliary relay managed by StA temp. setting with 2°C differential (NC). -2 (NC) = manual auxiliary relay controlled via AUX key (NC). -1 (NC) = alarm relay (NC). 0  = relay deactivated. 1 (NO) = alarm relay (NO). 2 (NO) =manual auxiliary relay controlled via AUX key (NO). 3 (NO) = automatic auxiliary relay managed by StA temp. setting with 2°C differential (NO). 4 (NO) = pump down function (NO, see CHAP 5.16). 5 (NO) = free voltage contact for condensing unit (AUX relay and compressor relay in parallel). 6 (NO) = relay excited during stand-by.	-1
AU2	Auxiliary/alarm relay 2 control	(like AU1 )	5
StA	Temperature setting for auxiliary relay	-45 – 99 °C	0 °C
nSC	Correction factor for the SET button during night operation (energy saving) (with In1 or In2 = 8 or -8) During night operation the control set is: Set Control = Set + nSC In night mode decimal point flashes.	-20 – 20 °C	0 °C

Variables	Meaning	Value	Default
In1	INP-1 input setting	8 = Night mode digital input (energy saving, N.O.) 7 = Stop defrosting remotely (N.O.) (reads rising edge of impulse) 6 = Start defrosting remotely (N.O.) (reads rising edge of impulse) 5 = Stand-by remotely (N.O.) (In order to indicate Stand-By mode, the display shows ‘In5’ alternating with the current view) 4 = Pump-down pressure switch (N.O.) 3 = Man-in-room alarm (N.O.) 2 = Compressor protection (N.O.) 1 = Door switch (N.O.) 0 = disabled -1 = Door switch (N.C.) -2 = Compressor protection (N.C.) -3 = Man-in-room alarm (N.C.) -4 = Pump-down pressure switch (N.C.) -5 = Stand-by remotely (N.C.) (In order to indicate Stand-By mode, the display shows ‘In5’ alternating with the current view) -6 = Start defrosting remotely (N.C.) (reads falling edge of impulse) -7 = Stop defrosting remotely (N.C.) (reads falling edge of impulse) -8 = Night mode digital input (energy saving, N.C.)	2
In2	INP-2 input setting	( like In1 )	1
bEE	Buzzer enable	0 = disabled 1 = enabled	1
mOd	Thermostat functioning mode	0 = Cold function 1 = Hot function (in this mode defrosting and fan disable Fst are excluded)	0
P1	Password type of protection (active when PA is not equal 0)	0 = only display set point 1 = display set point, AUX, light access 2 = access in programming not permitted 3 = access in second level programming not permitted	3
PA	Password (see P1 for the type of protection)	0…999 0 = not active	0
reL	Release software	indicates software version	read only

Troubleshooting

Alarm code	Possible cause	Solution
E0	Cold room temperature sensor not working properly	•  Check that cold room temperature sensor is working properly •  If the problem persists replace the sensor
E1	Defrost sensor not working properly (in this case defrosts will last time d3)	•  Check that defrost sensor is working properly •  If the problems persists replace the sensor
E2	Eeprom alarm An EEPROM memory alarm has been detected (All outputs except the alarm one are deactivated)	•  Switch unit off and back on
E8	Man in cold room alarm	•  Reset the alarm input inside the cold room
Ec	Compressor protection tripped (e.g. thermal protection or max pressure switch) (All outputs except the alarm one – where applicable – are deactivated)	•  Check that compressor is working properly •  Check compressor absorption •  If the problem persists contact the technical assistance service
Ed	Open door Alarm. When the door is opened and after tdo time, it’s setted back the normal functioning giving door open alarm (Ed)	•  Check door switch status •  Check door switch connections •  If the problem persists contact the technical assistance service
E9	Cell light alarm. The light of the cell has been on for a time greater than tdo.	•  Turn off the light
EH	Maximum temperature alarm. The temperature inside the cold room has exceeded the max. temperature alarm setting (see variables A2, user programming level)	•  Check that the compressor is working properly. •  Sensor not reading temperature properly or compressor start/stop control not working.
EL	Minimum temperature alarm. The temperature inside the cold room has exceeded the min. temperature alarm setting (see variables A1, user programming level)	•  Check that the compressor is working properly. •  Sensor not reading temperature properly or compressor start/stop control not working.

© Danfoss | DCS (vt) | 2020.05
AN30923034432301-000102 | 5

Documents / Resources

Danfoss AK-RC 113 Cold Storage Room Controller [pdf] Installation Guide AK-RC 113 Cold Storage Room Controller, AK-RC 113, Cold Storage Room Controller, Storage Room Controller, Room Controller

References

• User Manual