Transcript
Controller for controlling evaporators AKC 114 - 116, AKC 121
REFRIGERATION AND AIR CONDITIONING
Technical Brochure
Introduction
The controllers described in this brochure belong to the AK 100 series comprising evaporator controls for refrigeration appliances and small coldrooms. A system consists of the following components: controller, valve and sensors. The system, on the whole, replaces all other automatic controls, as it contains an injection function for optimum utilisation of evaporators, day and night thermostats, defrost function, fan control, rail heat control, light control, alarm function, and so on.
The controller works in conjunction with an electrically operated valve which will either be an expansion valve or a solenoid valve. Pt 1000 ohm temperature sensors, with great signal accuracy are used for measuring temperatures. Depending on the application selected, anywhere from 3 to 5 sensors are used per regulated evaporator.
Application
The system can be used on all refrigerating plant. For instance in: • Refrigeration appliances • Cold rooms • Air conditioning plant
Advantages
• Energy savings at - Adaptive setting of the expansion valve means optimum utilisation of the evaporator. - Controlled power consumption for rail heat and evaporator fan. - Adaption of condenser pressure. The compressor uses less power. - Defrost based on demand • Better product quality Greater temperature accuracy. • Designed for the future The flexible design of the system makes it easy to add more controllers if the refrigeration plant has to be extended. • PC connection In this way central operation and data collection are made possible. • Service function Temperatures and functions are monitored constantly. All controllers contain a service function that will help identifying faults in case of alarms. • Simple mounting System-adapted components make it easy to mount them, to run them in, and to service them. • Choise of refrigerant All fluorinated refrigerants may be used (also blends). And ammonia, when an AKVA valve is used. • One valve - two functions The AKV valve functions as both expansion valve and solenoid valve.
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Technical brochure
RC1HC802
©
Danfoss
03/2003
AKC 114 - 116, AKC 121
Controller types
The individual controllers are refrigeration controls containing the required functions for the control of medium temperature/low temperature appliances or rooms. There are several controller series, each with their own different functions depending on their field of application. AKC 114 This controller is a complete refrigeration appliance control with functions for the control of one evaporator in one medium temperature/low temperature appliance. The controller is specially suited for gas defrost. AKC 115-116 are extended refrigeration controls like AKC 114, but they can control two and three evaporators in the same refrigeration appliance, respectively. AKC 114D-116D Like AKC 114-116, but with slightly different functions, e.g. internal night clock and defrost on demand. AKC 114A-116A Primarily as the D version, but with slightly different functions. In this series the evaporating pressure is measured with a pressure transmitter. AKC 114F - 116F Primarily as the D version, but with slightly different functions. In this series an output for light control is used, and the signal for start/stop is a 24 V signal. AKC 121A This controller does not have an expansion valve function, but instead two thermostat functions. In other respects many of the functions are common to the above described controllers. The controller is particularly suited for systems with indirect refrigeration. AKC 121B Primarily as the AKC 121A version, but with slightly different functions. In this controller there is functions for light control and input signals from door switches. The controller is particularly suited for room control in systems with indirect refrigeration.
A survey of the different control versions and their functions is shown on page 10.
Operation can take place from a central place, either with control unit type AKA 21 or from a connected PC.
AKC 114 - 116, AKC 121
Technical brochure
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03/2003
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Standard functions
All controllers contain the following functions:
Data transmission
The individual regulators are normally placed in the individual refrigeration applicances. Operation of the regulators takes place via a separate control unit, type AKA 21. The control unit loacted at a central place, for instance outside of the shop itself. All regulators are interconnected by means of a two-core cable. When this connection has been established, all data communication takes place between the control unit and the regulators via this cable. A PC may also be connected to the system. In this way it is possible to operate the system and to collect all operational data via the PC. Sockets for connection of AKA 21 may be placed at any point of the data communication cable giving access to any connected regulator.
Day thermostat
In the controller you may choose between two thermostat functions -an OFF/ON thermostat or a modulating thermostat. When the air temperature at the media temperature sensor equals the set value the controller will stop the refrigeration and close the valve. When two air sensors (S3 and S4) are used, regulation may be based on the temperature differential across one of the evaporators.
Night thermostat
Refrigeration appliances are often covered during the night. This covering lowers the temperature in the refrigeration appliance. The night setback value, by which the controlled temperature has to be increased to offset the lower air temperature, is set on the controller. Changeover to night operation takes place with an internal or external signal.
Alarm thermostat
The alarm is activated when the media temperature is too high or too low. Alarm limits and time delays can be set at your option. Actual alarms and the nature of the alarm are shown directly on the operating unit.
Alarm function
A built-in alarm function constantly keeps an eye on the sensors, the valves, the liquid flow and the regulating functions. If faults are registered, an alarm signal is given. If the controller is not capable of controlling the liquid injection on account of a defective fan, or the like, the alarm will sound.
Service/diagnosis
The controller is equipped with a service/diagnosis system. The function is used in connection with start-up or alarm. By going through the service function, all system components are easily checked.
Display signal
A display can be connected which will show the air temperature at the evaporator. When refrigeration is cut out in connection with a defrost, this will be indicated in the display. Each section can be connected to a display.
Sensor correction
All measurements from the temperature sensors can be corrected, to compensate for long wires.
Defrost start
Activation of the defrost function can be arranged with an external signal (pulse signal) or by using the internal clock function.
Defrost stop
Defrost stop is based on temperature registration or on a fixed set time. The defrost sensor measures the evaporator’s surface temperature. When the temperature equals the set value, the defrost will stop in the section concerned. If the defrost cycle exceeds the programmed defrost period, the defrost will stop and the alarm will sound.
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03/2003
AKC 114 - 116, AKC 121
Fan control
This function permits cycling operation of the fan. The function is only activated during night operation, and when the thermostat is cut out. On/off periods for fan operation can be set on the control panel.
Rail heat control
The function cuts the required power for any connected rail-heating element in and out. On/off periods can be set on the control panel.
Access code
Two types of access code can be defined which will subsequently limit the access to the controller. Code 1 will give access to a limited part of the unit’s functions. Code 2 will give access to all the unit’s functions.
Master function
The controller can be overridden from a central master function on the following functions: night operation, stop of regulation, displacement of thermostat reference and displacement of alarm limit. The override signal is transmitted via DANBUSS.
AKC 114 - 116, AKC 121
Technical brochure
RC1HC802
©
Danfoss
03/2003
5
Special functions
The following functions are not standard in all controllers. See the survey on page 10.
Expansion valve
There are two ways of controlling the liquid supply to the evaporator: 1) The liquid supply is controlled by signals from three AKS sensors (S1, S2 and an air sensor, that can be placed in front of the evaporator, or behind it). The sensors register the difference between the temperature at the evaporator's outlet (S2) and the temperature at the evaporator's inlet (S1). Compared with the air temperature the sensors form a signal so that the superheat is continously held to a minimum, whatever the operating conditions. 2) Instead of registering the evaporating temperature with the S1 sensor, it is registered by means of a pressure transmitter. This signal may be used by several controllers from the same series (max. five). There are no settings for the regulation of the superheat. The controller itself will arrange for the optimum evaporator charge.
MOP function
The injection of liquid is kept at a minimum until the compressor has lowered the evaporating pressure to a safe level. The evaporating pressure is registered and compared with the MOP value. The normal expansion valve function will not start until the evaporating pressure is lower than the MOP value.
AKV valve
The AKV valve both functions as expansion valve and solenoid valve. The valve opens and closes by a signal from the controller or by an external signal sent to if from a defrost timer, thermostat or the safety controls.
Solenoid valve
This valve must be used in conjunction with AKC 121 which only controls temperatures.
Defrost type
The standard version of the controllers can control an electric defrost. Some of the controllers are furthermore provided with connections and setting options, so that they can carry out gas defrosts. Defrost stop can be made by means of temperature registration (e.g. with the S1 sensor when there is gas defrost, and the S5 sensor when there is electric defrost). During defrost the fan may be stopped. After defrost, the “delayed fan start” function or delayed injection function may be used, for instance after defrost in freezer cabinet.
Defrost based on demand
The function checks whether a planned defrost is to take place, or whether it can be skipped. It will then be required that the following functions are used: thermostat function, internal defrost clock, and that the defrost is stopped via the selected defrost sensor.
Language
The controller’s menus are shown with a brief text of 10 characters. From the factory this text is in English. With a setting, this text can be changed to another language (see survey on page 10).
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RC1HC802
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03/2003
AKC 114 - 116, AKC 121
TEV function
The electronic injection function can be disconnected. Control of the injection will then take place with a thermostatic expansion valve and a solenoid valve. The solenoid valve is connected to the controller’s AKV output. The thermostat function will now have ON/OFF control of the solenoid valve.
Glide
Setting of temperature glide on refrigeration systems using a zeotrope refrigerant.
Sequential defrost
This involves regulation of several sections. When there is defrost, the whole appliance need not be defrosted at one go, it may be done section by section.
Output to compressor relay
The output can be connected to the compressor's control circuit. The function may be used in connection with the thermostat function's on/off regulation, e.g. on plant with one evaporator and one compressor. Here the function may be used for starting and stopping the compressor.
Condensing pressure control
The output signal can be connected to the condenser’s control circuit. The signal is used for optimising the condensing pressure. The values for pressure increases and decreases are set via the control panel.
External alarm signal
The input can be connected to a contact function. When the contact cuts out, the alarm function will be activated.
External reference signal
The thermostat function’s reference can be displaced by means of an external voltage signal (0 - 10V d.c.). Or the input may be used for an alarm function, where alarm is given at high or low signal.
Light control
A relay output will follow day/night operation.
ON/OFF input
With an external signal it is possible to start a defrost cycle or to change between day and night operation.
ON/OFF input from door switch
With a signal to this input the controller will for example activate the light in the cold room. An attached alarm function will sound the alarm if the door has been open for a longer period than permitted.
AKC 114 - 116, AKC 121
Technical brochure
RC1HC802
©
Danfoss
03/2003
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Technical data Type
Supply voltage
AKC 114_
AKC 115_
AKC 116_
AKC 121_
+
+
+
+
10 VA
11 VA
12 VA
5 VA
5 stk.
9 stk.
13 stk.
6 stk.
-100 - +150°C
-100 - +150°C
-100 - +150°C
-100 - +150°C
1
1
1
1
1
1
1
1
1
230 V +10/-15%, 50/60 Hz
Power consumption Pt 1000 ohm /0°C Temperature range Sensor inputs
Low current input for night setback signal Signal input for pressure transmitter type AKS 32R (serie "A" only)
External reference signal 0 to 10 V (serie "A" only)
Kontaktfunktion
Start/stop refrigeration
2
Defrost start or Day-/night switch
1
External alarm signal
ON/OFF indgange
1
1
1
Start/stop refrigeration *)
1
1
1
Defrost start
1
1
1
AKV valve
1
2
3
(serie "A" only) 230 V a.c.
Semiconductor
ON-OFF udgange
elay:
(230 V) AC-1: 6 A (ohmic)
I max = 3,6 A
Fan Compressor
1
Alarm
1
1
Defrost
1
2
Rail heat
1
Gas defrost (114-116) 1
Condenser (serie "D") AC-15: 3 A (inductive)
Day-/night operation (serie "A") Solenoid valve
2
Railheat / Day-/night opertion / Fan
1
Operation Data communication
Control panel type AKA 21 / PC Hardware
RS 485
Software
DANBUSS 0 - +55°C, during operation -50 - +70°C, during transport
Environment
20 - 80% Rh, not condensed No shock influence / vibrations
Enclosure
Material
Eloxered aluminium (endedæksler i plast)
Density
IP 30(32)
Weight
1,5 kg
Montage
2 kg
2 kg
1,5 kg
Til indbygning på væg/DIN-skinne EU Low voltage Directive and EMC demands re CE-marking complied with. LVD-tested acc. to EN 60730-1 and EN 60730-2-9 EMC-tested acc. to EN50081-1, EN 50082-1 and EN61000-6-2
Approvals *) In the "F-series" is the signal 24 V.
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Technical brochure
RC1HC802
©
Danfoss
03/2003
AKC 114 - 116, AKC 121
Dimensions
AKC 114, 121: AKC 115 / 116:
AKC 114 - 116, AKC 121
Technical brochure
359 mm 539 mm
RC1HC802
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Danfoss
03/2003
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Technical brochure
RC1HC802
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03/2003
Sundry
Defrost
Thermostat
Injection
Code no.
Language /
Type
3
3
x
1
1
1
084B6178
AKC 114F
x
x
1
2
x
x
x
2
2
084B6179
AKC 115F
x
3
3
3
084B6180
AKC 116F
x
2
2
084B2051
AKC 121A
x
On/off input from door switch
x 2
On/off input
x
Rail heat or fan or light control
Light control or defrost
x
Light control
x
x
External alarm signal
Condenser pressure control
x
x
x
x
Output for compressor relay
x
x
x
Sequential defrost of sections
Defrost based on requirement
x
x
1
x
2
2
3
084B6176
Not required
x
x
2
084B6174
084B6175
AKC 116A
Gas defrost
1
1
1
084B6172
084B6173
AKC 115A
x
3
3
3
084B6049
084B6171
AKC 114A
x
x
x
1
2
x
x
x
2
2
084B6048
084B6045
AKC 116D
Electric defrost
1
1
1
084B6032
084B6044
AKC 115D
2
3
3
3
084B6047
084B6029
AKC 114D
Solenoid valve output
External reference signal
x
2
Number of thermostats
On/off thermostat or modulating thermostat
x
Glide adjustment
1
x
Number of temperature selections
x
TEV function
2
2
084B6046
MOP function
1
1
Evaporating temperature measurement with S1
Evaporating pressure measurement with AKS 32R
1
084B6028
084B6043
084B6042
084B6027
AKV valve
English, German, French, Danish, Spanish, Swedish
English, Danish, Spanish
English, German, French
AKC 116
AKC 115
AKC 114
2
2
x
x
2
x
2
2
084B2904
AKC 121B
Ordering
AKC 114 - 116, AKC 121
AKC 114A - 116A and AKC 114F - 116F are also manufactured in an IP 00 enclosure for installation in a cabinet.
IP 00
Type
Standard enclosure
IP 00 enclosure
Software
084B6171
084B6971
084B6171
084B6905 (8 pcs.)
084B6172
084B6972
084B6172
084B6902 (8 pcs.)
084B6173
084B6973
084B6173
084B6906 (6 pcs.)
084B6174
084B6974
084B6174
084B6903 (6 pcs.)
084B6175
084B6975
084B6175
084B6907 (6 pcs.)
084B6176
084B6976
084B6176
084B6904 (6 pcs.)
AKC 114F
084B6178
084B6978
084B6178
084B6908 (8 pcs.)
AKC 115F
084B6179
084B6979
084B6179
084B6909 (6 pcs.)
AKC 116F
084B6180
084B6980
084B6180
084B6910 (6 pcs.)
AKC 114A
AKC 115A
AKC 116A
Code no.
Pressure transmitter type AKS 32R for AKC 114A - AKC 116A Pressure range
-1 to 12 bar
Output signal For max 5 controllers
Supply
Accuracy
From controller
1% FS
Enclosure Supplied without plug. IP67 can be obtained with the connecting plug mentioned here
Connecting plug with 5 m cable
Pressure connection 1/4 in. flare 7/16 - 20 UNF
Code no. 060G1036
1/4 - 18 NPT
060G1037
G 3/8 A ISO 228/1
060G1038 060G1034
IP 67
The pressure transmitter specifications are described in main catalogue RK.0Y.G.
Accessories Function Bracket for DIN-rail (10 pcs.)
Code no. 084B6160
Display type AKA 14 (with 3 m cable)
084B6040
Display type AKA 15
084B6130
3 m cable for AKA 15 (24 pcs.)
084B6145
AKA 14
AKA 15
AKC 114 - 116, AKC 121
Technical brochure
RC1HC802
©
Danfoss
03/2003
11
AKC 114-116
Function description (AKC 114 - 116, AKC 114D - 116D, AKC 114A - 116A) ................................. RC1HU Function description (AKC 114F - 116F) .................................................................................................... RC1MF Menu operation via AKA 21 (AKC 114 - 116) ............................................................................................. RC1HV Menu operation via AKM (AKC 114 - 116) .................................................................................................. RC1HX Menu operation via AKA 21 (AKC 114D - 116D) ...................................................................................... RC1HZ Menu operation via AKM (AKC 114D - 116D) ........................................................................................... RC1H10 Menu operation via AKA 21 (AKC 114A - 116A) ....................................................................................... RC1MB Menu operation via AKM (AKC 114A - 116A) ............................................................................................ RC1MC Menu operation via AKA 21 (AKC 114F - 116F) ........................................................................................ RC1ME Menu operation via AKM (AKC 114F - 116F) ............................................................................................. RC1MG
AKC 121
Function description ............................................................................................................................... RC1MD Menu operation via AKA 21 (AKC 121A) ..................................................................................................... RC1MA Menu operation via AKA 21 (AKC 121B) .................................................................................................... RC1MJ
Common
Installation guide for data communication cable................................................................................... RC0XA Technical brochure Electronic expansion valve type AKV 10 ...................................................... RD8AB Main catalogue Solenoid valves and pressure transmitters type AKS 32R ...................... RK0YG Main catalogue Temperature sensors type AKS ........................................................................ RK0YG
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respecitve companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
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Technical brochure
RC1HC802
©
Danfoss
03/2003
RC-ET
Literature
AKC 114 - 116, AKC 121
