Controller for controlling evaporators AKC 114 - 116, AKC 121 Technical brochure ADAP-KOOL

Controller for controlling evaporators AKC 114 - 116, AKC 121 Technical brochure ADAP-KOOL
Technical brochure
ADAP-KOOL®
Controller for controlling evaporators
AKC 114 - 116, AKC 121
RC.1H.C6.02
®
RC.1H.C7.02
11-1999
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.
2
Technical brochure
RC.1H.C7.02
©
Danfoss
11/1999
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
RC.1H.C7.02
©
Danfoss
11/1999
3
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. Change-over 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.
4
Technical brochure
RC.1H.C7.02
©
Danfoss
11/1999
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
RC.1H.C7.02
©
Danfoss
11/1999
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).
6
Technical brochure
RC.1H.C7.02
©
Danfoss
11/1999
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
RC.1H.C7.02
©
Danfoss
11/1999
7
Technical data
Type
Supply voltage
230 V +10/-15%, 50/60 Hz
Power consumption
Pt 1000 ohm /0°C
Temperature range
Sensor inputs
AKC 114_
AKC 115_
AKC 116_
AKC 121_
+
+
+
+
10 VA
11 VA
12 VA
5 VA
5
9
13
6
-100 - +150°C -100 - +150°C -100 - +150°C -100 - +150°C
Low current input for night setback signal
1
1
1
1
1
1
1
1
1
Signal input for pressure transmitter type AKS 32R
(serie "A" only)
External reference signal 0 to 10 V (serie "A" only)
Contact function
Star t/stop refrigeration
Defrost star t or Day-/night
switch
External alarm signal
2
1
ON/OFF inputs
1
1
1
1
1
1
Defrost star t
1
1
1
AKV valve
1
2
3
(serie "A" only)
Star t/stop refrigeration
*)
230 V a.c.
Semiconductor
Fan
I max = 3.6 A
Compressor
Relay:
ON-OFF outputs
(230 V)
AC-1: 6 A
(ohmic)
1
Alarm
1
1
Defrost
1
2
Rail heat
1
Gas defrost (114-116)
Condenser (serie "D")
AC-15: 3 A
(inductive)
1
Day-/night operation (serie "A")
Solenoid valve
2
Railheat / Day-/night oper tion /
Fan
1
Operation
Control panel type AKA 21 / PC
Hardware
RS 485
Software
DANBUSS
During operation
0 - +55°C
During transpor t
-50 - +70°C
Data communication
Ambient temperature
Material
Anodised aluminium (End covers of plastic)
Density
IP 30(32)
Enclosure
Weight
1.5 kg
Montage
2 kg
2 kg
1.5 kg
For mounting on wall/DIN-rail
*) In the "F-series" is the signal 24 V.
8
Technical brochure
RC.1H.C7.02
©
Danfoss
11/1999
AKC 114 - 116, AKC 121
Dimensions
AKC 114, 121:
359 mm
AKC 115 / 116: 539 mm
AKC 114 - 116, AKC 121
Technical brochure
RC.1H.C7.02
©
Danfoss
11/1999
9
AKC
115
AKC
116
AKC
114D
AKC
115D
AKC
116D
AKC
114A
AKC
115A
AKC
116A
AKC
114F
AKC
115F
AKC
116F
English, German, French
084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-6027
6042
6043
6029
6044
6045
6171
6173
6175
6178
6179
6180
English, Danish, Spanish
084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-- 084B-6028
6046
6047
6032
6048
6049
6172
6174
6176
Language /
Code no.
English, German, French, Danish,
Spanish, Swedish
Technical brochure
Injection
RC.1H.C7.02
Thermostat
AKC
121B
084B-- 084B-2051
2904
AKV valve
1
2
3
1
2
3
Evaporating temperature
measurement with S1
1
2
3
1
2
3
1
Evaporating pressure measurement
with AKS 32R
2
3
1
2
3
1
2
3
x
MOP function
x
x
TEV function
x
x
Glide adjustment
x
x
Number of thermostats
AKC
121A
1
2
3
1
2
Number of temperature selections
1
1
On/off thermostat or modulating
thermostat
x
x
External reference signal
x
x
x
Not required
3
x
1
2
3
1
2
3
1
x
2
3
2
2
1
2
2
x
x
x
2
2
x
x
1
©
Solenoid valve output
Danfoss
Electric defrost
x
Gas defrost
x
x
x
x
x
x
Defrost
Defrost based on requirement
x
11/1999
Sequential defrost of sections
Output for compressor relay
Condenser pressure control
x
x
x
x
x
x
x
External alarm signal
x
Light control
x
x
AKC 114 - 116, AKC 121
Sundry
Light control or defrost
x
Rail heat or fan or light control
x
On/off input
On/off input from door switch
2
x
2
2
Ordering
10
AKC
114
Type
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.)
Code no.
AKC 114A
084B6173
084B6973
084B6173
084B6906 (6 pcs.)
084B6174
084B6974
084B6174
084B6903 (6 pcs.)
084B6175
084B6975
084B6175
084B6907 (6 pcs.)
084B6176
084B6976
084B6176
084B6904 (6 pcs.)
084B6178
084B6978
084B6178
084B6908 (8 pcs.)
AKC 115A
AKC 116A
AKC 114F
AKC 115F
084B6179
084B6979
084B6179
084B6909 (6 pcs.)
AKC 116F
084B6180
084B6980
084B6180
084B6910 (6 pcs.)
Pressure transmitter type AKS 32R for AKC 114A - AKC 116A
Pressure
range
-1 to 12 bar
Output signal
Supply
For max 5
controllers
From
controller
Accuracy
1% FS
Enclosure
Supplied without plug.
IP67 can be obtained
with the connecting plug
mentioned here
Connecting plug with 5 m cable
Pressure connection
Code no.
1/4 in. flare 7/16 - 20 UNF
060G1036
1/4 - 18 NPT
060G1037
G 3/8 A ISO 228/1
IP 67
060G1038
060G1034
The pressure transmitter specifications are described in main catalogue RK.00.H.
Accessories
Function
Code no.
Bracket for DIN-rail (10 pcs.)
084B6160
Display type AKA 14 (with 3.5 m cable)
084B6040
AKC 114 - 116, AKC 121
Technical brochure
RC.1H.C7.02
©
Danfoss
11/1999
11
Literature
AKC 114-116
Function description (AKC 114 - 116, AKC 114D - 116D, AKC 114A - 116A) .......... RC.1H.U
Function description (AKC 114F - 116F) .................................................................... RC.1M.F
Menu operation via AKA 21 (AKC 114 - 116) ............................................................ RC.1H.V
Menu operation via AKM (AKC 114 - 116) ................................................................. RC.1H.X
Menu operation via AKA 21 (AKC 114D - 116D) ....................................................... RC.1H.Z
Menu operation via AKM (AKC 114D - 116D) ........................................................... RC.1H.10
Menu operation via AKA 21 (AKC 114A - 116A) ....................................................... RC.1M.B
Menu operation via AKM (AKC 114A - 116A) ............................................................ RC.1M.C
Menu operation via AKA 21 (AKC 114F - 116F) ........................................................ RC.1M.E
Menu operation via AKM (AKC 114F - 116F) ............................................................. RC.1M.G
AKC 121
Function description
............................................................................................. RC.1M.D
Menu operation via AKA 21 (AKC 121A) ................................................................... RC.1M.A
Menu operation via AKA 21 (AKC 121B) ................................................................... RC.1M.J
Common
Installation guide for data communication cable ....................................................... RC.0X.A
Technical brochure Electronic expansion valve type AKV 10 ................................. RC.1H.R
Main catalogue
Solenoid valves and pressure transmitters type AKS 32R ...... RK.00.H
Main catalogue
Temperature sensors type AKS ................................................ RK.00.H
AC-RDT
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.
12
Technical brochure
RC.1H.C7.02
©
Danfoss
11/1999
AKC 114 - 116, AKC 121
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Related manuals

Download PDF

advertisement