Danfoss AK-CC 550B Instructions

Product Information and Operation Manual

1. Identification, Dimensions, Principle, and AKV Info

This section provides essential identification and schematic information for the Danfoss AK-CC 550B controller.

Identification: Features a diagram of the controller unit with model number AK-CC 550B and identification code 084B8032.

Dimensions: Illustrates the physical dimensions of the unit: 180 mm width, 100 mm height, and 61.5 mm depth.

Principle: A schematic diagram shows the basic operational principle, including sensor inputs (S2, S3, S4, S5) and output connections.

AKV Info: A wiring diagram illustrating connections for a 230 V a.c. coil, relevant for AKV type expansion valves.

Additional Information: The controller is available with manuals in multiple languages, including English, German, French, Danish, Spanish, Italian, Swedish, and Dutch. Further information and documentation are available at www.danfoss.com.

2. Application Diagrams

The controller is supplied with signs indicating default application settings. Users can replace these signs to match their specific application requirements. The diagrams on pages 2 and 3 illustrate ten different application wiring configurations, detailing sensor inputs (S2-S6, S3B, S5B), digital inputs (DI1-DI3), analog inputs (AI1-AI7), digital outputs (DO1-DO6), and communication interfaces (EKA Display, RS485, MODBUS, RJ45). Each application represents a distinct setup for various refrigeration system control scenarios.

3. Data Communication

Proper installation of data communication cables (MODBUS, DANBUSS, RS 485) is crucial and must comply with specific requirements, as detailed in literature RC8AC. The document outlines connections for System Managers/Gateways (e.g., AK-SM, AKA 245) and displays (EKA 163/164) for both short (L < 15 m) and long (L > 15 m) cable runs.

4. Connections Overview

This section details the controller's inputs, outputs, and communication interfaces. It includes a comprehensive table mapping applications (1-10) to specific output (DO1-DO6), digital input (DI1-DI3), and analog input (AI1-AI7) configurations.

Input and Output Descriptions:

DI1, DI2: Digital inputs that activate a defined function when short-circuited or opened, with functions specified in parameters o02 and o37 respectively.
DI3: A high voltage digital input (0/230 V AC) with functions defined in parameter o84.
Pressure Transmitter (AKS 32R): Connects to terminals 30, 31, 32. The signal can be shared by up to 10 controllers, provided there are no significant pressure drops between evaporators.
Sensors:
- S2, S6: Pt 1000 ohm sensors. S6 is designated as a product sensor.
- S3, S4, S5: Pt 1000 ohm or PTC 1000 ohm sensors (must be of the same type). S3 is for warm air before the evaporator, S4 for cold air after the evaporator (configurable), and S5 is a defrost sensor placed on the evaporator.
Communication Interfaces:
- EKA Display: For external reading/operation (EKA 163B or EKA 164B).
- RS485: For data communication via a module (LON RS485, DANBUSS, MODBUS) using terminals 51 (screen), 52 (A+), 53 (B-). Requires gateway version 6.20 or higher for LON RS485.
- RJ45: For TCP/IP communication via a module.
- MODBUS: For data communication using terminals 56 (screen), 57 (A+), 58 (B-). Can alternatively be used for external displays (EKA 163A/164A), but then data communication is not possible via these terminals.
Supply Voltage: 230 V a.c., 50/60 Hz.
DO1: Connection for expansion valve type AKV or AKVA, requiring a 230 V a.c. coil.

5. Output Functions

Detailed descriptions of the digital outputs (DO1-DO6) and their associated functions:

DO2: Functions include Alarm, Rail heat, Heating element in drip tray, Night blind, and Suction line valve control.
DO3: Controls Refrigeration, Rail heat, Heat function, Defrost 2, and Heating element in drip tray.
DO4: Manages Defrost operations and Hot gas/drain valve.
DO5: Controls the Fan.
DO6: Operates a Light relay.
Additional Output: Rail heat and Compressor 2 control is also managed.

Digital Input DI3: A high voltage input (0/230 V AC) with functions defined in parameter o84.

Data Communication: Emphasizes correct installation of data communication cables and refers to literature RC8AC.

Electric Noise: Advises keeping sensor, DI, and data communication cables separate from other electrical cables, using separate cable trays and maintaining a distance of at least 10 cm. Long cables at DI inputs should be avoided.

Installation Considerations: Warns against accidental damage, poor installation, or site conditions leading to malfunctions. Stresses that electronic controls are not a substitute for good engineering practice. Danfoss is not responsible for damage resulting from defects. Installers must check installations thoroughly and fit safety devices. Notes the importance of signals during compressor stop and the need for liquid receivers.

Coordinated Defrost: Explains coordinated defrosting via cable connections and data communication, ensuring refrigeration resumes when all controllers release the defrost signal. Coordination settings are managed in the gateway/system manager.

6. Operation

Display: The controller features a three-digit display that can show temperature in °C or °F.

LEDs: Indicate operational status: = Refrigeration, = Defrost, = Fan running. LEDs flash during alarms, allowing error code download and alarm acknowledgment.

Buttons: Used for menu navigation and setting adjustments. Pushing the upper button accesses the parameter codes. The upper/lower buttons adjust values, and the middle button confirms selections and saves changes.

Examples: Step-by-step guides are provided for setting menus, adjusting temperature, handling alarm codes, and initiating manual defrost.

Get a Good Start: A quick start procedure involves opening parameter r12 (stop regulation), selecting electrical connections, setting parameter o61 (electric connection number), choosing preset settings from a table, selecting the refrigerant (o30), starting regulation (r12), and reviewing/adjusting factory settings.

Preset Settings Table:

Auxiliary schedule for settings (quick-setup)	Case	Room	Defrost stop on time S5	Defrost stop on time S5
Preset settings (o62)	1	2	3	4	5	6
Temperature (SP)	2°C	-2°C	-28°C	4°C	0°C	-22°C
Max. temp. setting (r02)	6°C	4°C	-22°C	8°C	5°C	-20°C
Min. temp. setting (r03)	0°C	-4°C	-30°C	0°C	-2°C	-24°C
Sensor signal for thermostat. S4% (r15)	100%	0%	0%	100%	0%	0%
Alarm limit high (A13)	8°C	6°C	-15°C	10°C	8°C	-15°C
Alarm limit low (A14)	-5°C	-5°C	-30°C	0°C	0°C	-30°C
Sensor signal for alarm funct.S4% (A36)	0%	100%	0%	0%	100%	0%
Interval between defrost (d03)	6 h	6h	12h	8h	8h	6h
Defrost sensor: 0=time, 1=S5, 2=S4 (d10)	0	1	1	0	1	1
DI1 config. (o02)	Case cleaning (=10)	Door function (=2)
Sensor signal for display view S4% (o17)	0%

Parameter o62 is used to select the array of preset settings.

Parameter o30 is used to select the refrigerant.

7. Menu Survey

This section provides a detailed survey of controller parameters, categorized by function. Each parameter is listed with its code, description, relevant EL-diagram page, minimum/maximum/factory/actual values, and applicability across different applications (1-10).

Function	Parameter	EL-diagram page 2 and 3										Min. value	Max. value	Factory setting	Actual setting
	Code	1	2	3	4	5	6	7	8	9	10
Normal operation
Temperature (setpoint)	r01	1	1	1	1	1	1	1	1	1	1	0.1 K	20 K	2
Thermostat Differential
Max. limitation of setpoint setting	r02	1	1	1	1	1	1	1	1	1	1	-49°C	50°C	50
Min. limitation of setpoint setting	r03	1	1	1	1	1	1	1	1	1	1	-50°C	49°C	-50
Adjustment of temperature indication	r04	1	1	1	1	1	1	1	1	1	1	-10	10	0
Temperature unit (°C/°F)	r05	1	1	1	1	1	1	1	1	1	1	0/°C	1/°F	0/°C
Correction of the signal from S4	r09	1	1	1	1	1	1	1	1	1	1	-10 K	10 K	0
Correction of the signal from S3 and S3B	r10	1	1	1	1	1	1	1	1	1	1	-10 K	10 K	0
Manual service, stop regulation, start regulation (-1, 0, 1)	r12	1	1	1	1	1	1	1	1	1	1	-1	1	0
Displacement of reference during night operation	r13	1	1	1	1	1	1	1	1	1	1	-50 K	50 K	0
Define thermostat function (1=ON/OFF, 2=Modulating)	r14	1	1	1	1	1	1	1	1	1	1	1	2	1
Definition and weighting, if applicable, of thermostat sensors - S4% (100%=S4, 0%=S3)	r15	1	1	1	1	1	1	1	1	1	1	0%	100%	100
Time between melt periods	r16	1	1	1	1	1	1	1	1	1	1	0 hrs	10 hrs	1
Duration of melt periods	r17	1	1	1	1	1	1	1	1	1	1	0 min.	30 min.	5
Temperature setting for thermostat band 2. As differential use r01	r21	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	2
Correction of the signal from S6	r59	1	1	1	1	1	1	1	1	1	1	-10 K	10 K	0
Definition and weighting, if applicable, of thermostat sensors when night cover is on. (100%=S4, 0%=S3)	r61	1	1	1	1	1	1	1	1	1	1	0%	100%	100
Heat function	r62												50 K	2
Neutral zone between refrigeration and heat function
Time delay at switch between refrigeration and heat function	r63	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	0
Alarms
Delay for temperature alarm	A03	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	30
Delay for door alarm	A04	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	60
Delay for temperature alarm after defrost	A12	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	90
High alarm limit for thermostat 1	A13	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	8
Low alarm limit for thermostat 1	A14	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	-30
High alarm limit for thermostat 2	A20	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	8
Low alarm limit for thermostat 2	A21	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	-30
High alarm limit for sensor S6 at thermostat 1	A22	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	8
Low alarm limit for sensor S6 at thermostat 1	A23	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	-30
High alarm limit for sensor S6 at thermostat 2	A24	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	8
Low alarm limit for sensor S6 at thermostat 2	A25	1	1	1	1	1	1	1	1	1	1	-50°C	50°C	-30
S6 alarm time delay	A26	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	240
With setting = 240 the S6 alarm will be omitted
Alarm time delay or signal on the DI1 input	A27	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	30
Alarm time delay or signal on the DI2 input	A28	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	30
Signal for alarm thermostat. S4% (100%=S4, 0%=S3)	A36	1	1	1	1	1	1	1	1	1	1	0%	100%	100
Delay for S6 (product sensor alarm) after defrost	A52	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	90
Delay for temperature alarm S3B	A53	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	90
Compressor
Min. ON-time	c01	1	1	1	1							0 min.	30 min.	0
Min. OFF-time	c02	1	1	1	1							0 min.	30 min.	0
Time delay for cutin of comp.2	c05	1										0 sec	999 sec	5
Defrost
Defrost method: 0=Off, 1= EL, 2= Gas	d01	1	1	1	1	1	1	1	1	1	1	0/Off	2/Gas	1/EL
Defrost stop temperature	d02	1	1	1	1	1	1	1	1	1	1	0°C	50°C	6
Interval between defrost starts	d03	1	1	1	1	1	1	1	1	1	1	0 hrs/Off	240 hrs	8
Max. defrost duration	d04	1	1	1	1	1	1	1	1	1	1	0 min.	360 min.	45
Displacement of time on cutin of defrost at start-up	d05	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	0
Drip off time	d06	1	1	1	1	1	1	1	1	1	1	0 min.	60 min.	0
Delay for fan start after defrost	d07	1	1	1	1	1	1	1	1	1	1	0 min.	60 min.	0
Fan start temperature	d08	1	1	1	1	1	1	1	1	1	1	-50 °C	0°C	-5
Fan cutin during defrost (0: Stopped, 1: Running, 2: Running during pump down and defrost, 3: Running but stop at d41)	d09	1	1	1	1	1	1	1	1	1	1	0	2	1

Note: Parameter values are indicative and may vary based on specific configurations and firmware versions.

8. Fault Messages and Operating Status

Fault Messages: The controller provides detailed fault messages. In case of an error, LEDs flash and the alarm relay activates. Pressing the top button displays the alarm report. Messages are classified as A-alarms (delayed visibility) and E-alarms (immediate visibility). The table below lists common alarm codes, their descriptions, associated alarm relay groups (P41), and their corresponding operating status codes.

Code / Alarm text via data communication	Description	Alarm relay groups (P41)	Operating status	(Measurement) Ctrl. state: (Shown in all menu displays)
A1/--- High t.alarm	High temperature alarm	1	S0	0
A2/--- Low t. alarm	Low temperature alarm	2	S1	1
A4/--- Door alarm	Door alarm	8	S2	2
A5/--- Max hold time	The "o16" function is activated during a coordinated defrost	16	S3	3
A10/--- Inject prob.	Control problem	64	S4	4
A11/--- No Rfg. sel.	No refrigerant selected	64	S10	10
A13/--- High temp	Temperature alarm. High S6	1	S11	11
A14/--- Low temp S6	Temperature alarm. Low S6	2	S14	14
A15/--- DI1 alarm	DI1 alarm	8	S15	15
A16/--- DI2 alarm	DI2 alarm	8	S16	16
A45/--- Standby mode	Standby position (stopped refrigeration via r12 or DI input)	-	S17	17
A59/--- Case clean	Case cleaning. Signal from DI input	-	S18	18
A70/--- High temp	High temperature alarm, B section	1	S19	19
A71/--- Low temp	Low temperature alarm, B section	2	S20	20
AA2/--- Refg. leak	Refrigerant leak alarm	8	S21	21
AA3/--- CO2 alarm	CO2 leak alarm	8	S22	22
--- AD fault	Error in the adaptive defrost function	16	S23	23
--- AD Iced	Evaporator is iced up. Reduction of air flow	16	S24	24
--- AD not defr.	Defrost of evaporator is not satisfactory	16	S25	25
--- AD flashgas.	Flash gas is formed at the valve	16	S26	26
E1/--- Ctrl. error	Faults in the controller	32	S29	29
E6/--- RTC error	Check clock	32	S30	30
E20/--- Pe error	Error on pressure transmitter Pe	64	S32	32
E24/--- S2 error	Error on S2 sensor	4	S33	33
E25/--- S3 error	Error on S3 sensor	4	S45	45
E26/--- S4 error	Error on S4 sensor	4	S48	48
E27/--- S5 error	Error on S5 sensor	4
E28/--- S6 error	Error on S6 sensor	4
E34/--- S3 error B	Error on S3B sensor	4
E37/--- S5 error B	Error on S5B sensor	4
---/--- Max Def.Time	Defrost stopped based on time instead of, as wanted, on temperature	16

Operating Status: The controller indicates its operational state through status codes (S0-S48). Examples include 'Normal regulation', 'Waiting for end of coordinated defrost', 'Refrigeration stopped by main switch', and 'Defrost sequence. Defrost in progress'.

Other Displays: Indicates conditions like 'The defrost temperature cannot be displayed', 'Defrost in progress / First cooling after defrost', 'Password required', and 'Regulation is stopped via main switch'.

*) Emergency cooling activates if a defined S3 or S4 sensor signal is lost. Regulation continues with an average cut-in frequency.

Data Communication: Alarm destination settings allow customization of alarm logging, relay activation, and network transmission.

9. Continued Menu Survey and Service Information

This section continues the detailed parameter survey and includes service-related information.

Function	Parameter	EL-diagram page 2 and 3										Min.	Max.	Fac.	Actual
	Code	1	2	3	4	5	6	7	8	9	10
Continued
Refrigerant setting: (List of refrigerants 1-42)	o30	1	1	1	1	1	1	1	1	1	1	0	42	0
Input signal on DI2. Function: (List of functions 0-21)	o37	1	1	1	1	1	1	1	1	1	1	0	21	0
Configuration of light function: 1=Light follows day/night operation, 2=Light control via data communication via 'o39', 3=Light control with a DI-input, 4=As "2", but light switch on and night cover will open if the network cut out for more than 15 minutes.	o38	1	1	1	1	1	1	1	1	1	1	1	4	1
Activation of light relay (only if o38=2) On=light	o39	1	1	1	1	1	1	1	1	1	1	0/Off	1/On	0/Off
Rail heat On time during day operations	o41	1	1	1	1	1	1	1	1	1	1	0%	100%	100
Rail heat On time during night operations	o42	1	1	1	1	1	1	1	1	1	1	0%	100%	100
Rail heat period time (On time + Off time)	o43	1	1	1	1	1	1	1	1	1	1	6 min.	60 min.	10
Case cleaning. 0=no case cleaning. 1=Fans only. 2=All output Off.	o46	1	1	1	1	1	1	1	1	1	1	0	2	0
Selection of EL diagram. See overview page 12 and 13	o61	1	1	1	1	1	1	1	1	1	1	10	1
Download a set of predetermined settings. See overview page 27.	o62	1	1	1	1	1	1	1	1	1	1	0	6	0
Access code 2 (partial access)	o64	1	1	1	1	1	1	1	1	1	1	0	100	0
Replace the controllers factory settings with the present settings	o67	1	1	1	1	1	1	1	1	1	1	0/Off	1/On	0/Off
Input signal on DI3. Function: (high voltage input) (0=not used. 1=status on DI2. 2=door function with alarm when open. 3=door alarm when open. 4=defrost start (pulse-signal). 5=ext. main switch 6=night operation, 7=thermostat band changeover (activate r21). 8=Not used. 9=Not used. 10=case cleaning (pulse signal). 11=forced cooling at hot gas defrost, 12=night cover. 13=Not used. 14=Refrigeration stopped (forced closing)). 15=appliance shutdown. 21=activate flooding.	o84	1	1	1	1	1	1	1	1	1	1	0	21	0
Rail heat control (0=not used, 1=pulse control with timer function (o41 and o42), 2=pulse control with dew point function)	o85	1	1	1	1	1	1	1				0	2	0
Dew point value where the rail heat is minimum	o86	1	1	1	1	1	1	1				-10°C	50°C	8
Dew point value where the rail heat is 100% on	o87	1	1	1	1	1	1	1				-9°C	50°C	17
Lowest permitted rail heat effect in %	o88	1	1	1	1	1	1	1				0%	100%	30
Time delay from "open door" refrigeration is started	o89	1	1	1	1	1	1	1	1	1	1	0 min.	240 min.	30
Fan operation on stopped refrigeration (forced closing): 0 = Stopped (defrosting permitted) 1 = Running (defrosting permitted) 2 = Stopped (defrosting not permitted) 3 = Running (defrosting not permitted)	o90	1	1	1	1	1	1	1	1	1	1	0	3	1
Definition of readings on lower button: 1=defrost stop temperature, 2=S6 temperature, 3=S3 temperature , 4=S4 temperature	o92	1	1	1	1	1	1	1	1	1	1	1	3	1
Display of temperature (1= u56 Air temperature (set automatically to 1 at application 9), 2= u36 product temperature)	o97	1	1	1	1	1	1	1	1	1	1	1	2	1
Light and night blinds defined (0: Light is switch off and night blind is open when the main switch is off, 1: Light and night blind is independent of main switch)	o98	1	1	1	1	1	1	1	1	1	1	0	1	0
Service
Configuration of alarm relay (0 - Alarm relay not used, 1 - High temperature alarms, 2 - Low temperature alarms, 4 - Sensor error, 8 - Digital input enabled for alarm, 16 - Defrosting alarms, 32 - Miscellaneous, 64 - Injection alarms. Sum of groups to activate.)	P41	1	1	1	1	1	1	1	1	1	1	0	127	111
Temperature measured with S5 sensor	u09	1	1	1	1	1	1	1	1	1	1
Status on DI1 input. on/1=closed	u10	1	1	1	1	1	1	1	1	1	1
Actual defrost time (minutes)	u11	1	1	1	1	1	1	1	1	1	1
Temperature measured with S3 sensor	u12	1	1	1	1	1	1	1	1	1	1
Status on night operation (on or off ) 1=on	u13	1	1	1	1	1	1	1	1	1	1
Temperature measured with S4 sensor	u16	1	1	1	1	1	1	1	1	1	1
Thermostat temperature	u17	1	1	1	1	1	1	1	1
Run time of thermostat (cooling time) in minutes	u18	1	1	1	1	1	1	1	1	1	1
Temperature of evaporator outlet temp.	u20	1	1	1	1	1	1	1	1	1	1
Superheat across evaporator	u21	1	1	1	1	1	1	1	1	1	1
Reference of superheat control	u22	1	1	1	1	1	1	1	1	1	1
Opening degree of AKV valve	u23	1	1	1	1	1	1	1	1	1	1
Evaporating pressure Po (relative)	u25	1	1	1	1	1	1	1	1	1	1
Evaporator temperature To (Calculated)	u26	1	1	1	1	1	1	1	1	1	1
Temperature measured with S6 sensor (product temperature)	u36	1	1	1	1	1	1	1	1
Status on DI2 output. on/1=closed	u37	1	1	1	1	1	1	1	1	1	1
Air temperature. Weighted S3 and S4	u56	1	1	1	1	1	1	1	1	1	1
Measured temperature for alarm thermostat	u57	1	1	1	1	1	1	1	1	1	1
Status on relay for cooling	u58	1	1	1	1	1	1	1	1
Status on relay for fan	u59	1	1	1	1	1	1	1	1	1	1
Status on relay for defrost	u60	1	1	1	1	1	1	1	1	1	1
Status on relay for railheat	u61	1	1	1	1	1	1	1	1	1	1
Status on relay for alarm	u62	1	1	1	1	1	1	1	1	1	1
Status on relay for light	u63	1	1	1	1	1	1	1	1	1	1
Status on relay for valve in suction line	u64	1	1	1	1	1	1	1	1	1	1
Status on relay for compressor 2	u67	1	1	1	1	1	1	1	1	1	1
Temperature measured with S5B sensor	u75	1	1	1	1	1	1	1	1	1	1
Temperature measured with S3B sensor	u76	1	1	1	1	1	1	1	1	1	1
Status on relay for hot gas- / drain valve	u80	1	1	1	1	1	1	1	1	1	1
Status on relay for heating element in drip tray	u81	1	1	1	1	1	1	1	1	1	1
Status on relay for night blinds	u82	1	1	1	1	1	1	1	1	1	1
Status on relay for defrost B	u83	1	1	1	1	1	1	1	1	1	1
Status on relay for heat function	u84	1	1	1	1	1	1	1	1	1	1
Readout of the actual rail heat effect	u85	1	1	1	1	1	1	1	1	1	1
1: Thermostat 1 operating, 2: Thermostat 2 operating	u86	1	1	1	1	1	1	1	1	1	1
Status on high voltage input DI3	u87	1	1	1	1	1	1	1	1	1	1
Readout of thermostats actual cut in value	u90	1	1	1	1	1	1	1	1	1	1
Readout of thermostats actual cut out value	u91	1	1	1	1	1	1	1	1	1	1
Readout of status on the adaptive defrost (0: Off. Function is not activated and are zero set, 1: Sensor error or S3/S4 are reversed, 2: Tuning is in progress, 3: Normal, 4: Light build-up of ice, 5: Medium build-up of ice, 6: Heavy build-up of ice)	U01	1	1	1	1	1	1	1	1	1	1	0	6	1
Number of defrosts carried out since the initial power up or since the resetting of the function	U10	1	1	1	1	1	1	1	1	1	1
Number of defrosts skipped since the initial power up or since the resetting of the function	U11	1	1	1	1	1	1	1	1	1	1
Measured temperature for alarm thermostat in section B	U34	1	1	1	1	1	1	1	1	1	1
Air temperature in section B	U35	1	1	1	1	1	1	1	1	1	1

Note: Service parameters may have specific access restrictions or require regulation to be stopped. Factory settings are indicated for standard units.

	Danfoss AK-CC 550A Instruction Manual - Refrigeration Controller Guide Comprehensive instructions for the Danfoss AK-CC 550A refrigeration controller, covering identification, dimensions, principle, connections, operation, parameters, and error messages. Learn how to set up and manage your refrigeration system efficiently.
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