Danfoss AKC 55 System
The Danfoss AKC 55 System is a powerful and versatile control system for HVAC applications. It offers a wide range of features and capabilities to help you optimize the performance of your HVAC system and improve occupant comfort.
Key features of the Danfoss AKC 55 System:
- Scalable architecture: The AKC 55 System can be scaled to meet the needs of any size HVAC system, from small single-zone systems to large multi-zone systems.
- Wide range of I/O modules: The AKC 55 System offers a wide range of I/O modules to support a variety of sensors and actuators. This allows you to customize the system to meet the specific needs of your application.
Danfoss AKC 55 System
The Danfoss AKC 55 System is a powerful and versatile control system for HVAC applications. It offers a wide range of features and capabilities to help you optimize the performance of your HVAC system and improve occupant comfort.
Key features of the Danfoss AKC 55 System:
- Scalable architecture: The AKC 55 System can be scaled to meet the needs of any size HVAC system, from small single-zone systems to large multi-zone systems.
- Wide range of I/O modules: The AKC 55 System offers a wide range of I/O modules to support a variety of sensors and actuators. This allows you to customize the system to meet the specific needs of your application.
AKCESS System Manual RC.IU.B1.22 4/99.1 3-25
Chapter 3 - 6 Installing VO2 Analog Output Boards
VO2 Description and
Identification The VO2 Variable Output board provides an AKC 55 system with 2 variable outputs for control of
loads like variable speed compressors and variable speed condenser fan motors. Each output can supply
0-10 VDC or 0-5 VDC. Both outputs can supply the same range or there can be one in each voltage
range.
Since they are nodes on the I/O network,
VO2 boards communicate with a host AKC
55 over TP-78K twisted pair shielded cable.
The board’s name and version number are
printed on the board as shown in the
following illustration.
Mounting The VO2 board is designed for 3" snaptrack mounting in either a Danfoss IO4R or IO12 enclosure, and
OEM control panel, or other enclosed spaces. Snaptrack for I/O boards can be mounted on any flat
surface where codes and good electrical practice permit. A Danfoss IOPS-series power supply must be
used to provide operating voltage for I/O boards not mounted in a Danfoss IO4R or IO12 enclosure.
Addressing a VO2 Each of the VO2 boards connected to an AKC 55 must have a unique address in the range 01-99. The
address is set by the two rotary switches located side-by-side beneath the board’s “status” and “service”
LED’s. Each switch has an arrow pointer which serves also as a screwdriver slot. Use a small screw-
driver to rotate the arrowhead on each switch until the left arrowhead points to the first digit, and the
right arrowhead to the second digit, of the correct address.
3-26 System Manual RC.IU.B1.22 4/99.1 AKCESS
Network Connections The VO2 board is connected to the I/O network at the terminal strip labeled “NETWORK”. When
connecting from board to board (point-to-point or “daisy-chain” wiring), use only twisted-pair cable
meeting the specifications given in the illustration below. There is no polarity to observe; connect the
two signal wires to the terminals labeled “A” and “B”, and the cable shield to the terminal labeled
“shield”.
Controlled
Load Connections Each load to be controlled is connected to a variable output by wiring to one of the two pairs of “Vout”
and “GND” terminals on terminal strip in the lower right corner of the board.
VO2 Power
Connections As with all I/O boards in the AKC 55 system, 12 VAC or 15 VDC from a Danfoss IOPS-series power
supply is connected to a terminal strip labeled “12 VAC” on the VO2 board. The power terminal strip is
shown in the upper left corner of the illustration.
I
f
it
s t
h
e
l
ast
board on a main
I/O cable run, for
Petes sake
terminate it!!
Keep the wiring distance
from the power supply to
the I/O board under the
limits given in the IOPS-
series instruction sheet.
There are
copies of the
instructions in Appendix B !
AKCESS System Manual RC.IU.B1.22 4/99.1 3-27
Inspection of the
Installed VO2 When a VO2 Variable Output Board is ready for operation, you should be able to observe the following,
proceeding clockwise around the board from the power terminal strip:
1. Power (12 VAC or 15 VDC) has been connected to the “12 VAC” terminal strip.
2. The status LED should be blinking. If the status LED is off, there is no power to the board
(check the fuses). If the status LED is constantly on (not blinking), the board is not communi-
cating with its AKC 55. Make sure the AKC 55 has been configured for this board; if
configured, there will be information in at least one of the Board and Points screens; you can
investigate, and supply configuration information, if necessary, by following the procedures
described in Section IV of this manual.
3. The service LED will normally blink briefly when the network is scanned, but if the service
LED remains steadily on, the VO2 board is defective and should be replaced.
4. The address switches have been set to a valid address.
5. Loads are connected to one or both of the pair of output terminals.
6. Connection has been made to the I/O network of an AKC 55 at the “NETWORK” terminal.
7. If this board is the last node on a run, make sure that it is terminated by using one of the
terminators supplied with the AKC 55.
3-28 System Manual RC.IU.B1.22 4/99.1 AKCESS
Chapter 3 - 7 Installing RTC Rooftop Controllers
RTC Description The RTC Rooftop Controller can operate in two modes: as a node in an AKCESS I/O Identification net-
work, connected to an AKC 55, or as a stand-alone rooftop controller. The RTC communicates over the
I/O network when it is a node in an AKCESS system. Like an AKCESS Smart Case Controller, the
RTC is an intelligent controller. If communications are interrupted or lost, the RTC will continue to
operate as a stand-alone controller with the same strategy and settings as selected during its configuration
as part of the AKCESS network.
Availability The RTC is available from Danfoss in a rainproof enclosure or without enclosure for installation by
original equipment manufacturers.
Capabilities and
Capacities There can be as many as 32 RTC rooftop controller nodes in an AKCESS system, as long as the total
number of HVAC systems does not exceed 32.
Capacity:
Sensor Inputs The RTC has one required and up to seven optional sensor inputs, which are pre-assigned for use as
follows:
These sensor inputs need not be wired directly to the RTC board; they can be set up during configura-
tion to be received from sensors connected to any SI board in the AKCESS system.
Required Sensor At least one zone temperature sensor or the return temperature sensor must be connected in order for the
RTC to function.
Capacity:
On/Off inputs There are up to four optional on/off inputs, pre-assigned for use as follwos:
Input
Number
Sensor
1Zone Humidit
y
1
2Zone Humidit
y
2
3Outside Humidit
y
4Zone Tem
p
erature 1
5Zone Tem
p
erature 2
6Outside Tem
p
erature
7 Supply Temperature
8 Return Temperature
Input
Number
On/Off Input
1Fan
2 Cooling 1
3 Heating 1 OR Cooling 2
4 Smoke Detector OR Differential Pressure
These on/off inputs can be wired directly to the RTC board or they can be received from any OI board
on the AKCESS network.
AKCESS System Manual RC.IU.B1.22 4/99.1 3-29
Capacity:
Relay Outputs Relay outputs are provided for control of HVAC devices, and are pre-assigned for control as follows:
Mounting Using the pre-drilled holes, mount the RTC securely to a solid surface. Operating temperature must be
in the range from 0
o
F to 130
o
F at 90% rh (non-condensing) or from 0
o
F to 122
o
F at 95% rh (non-
condensing).
Addressing The RTC is addressed by setting the two side-by-side rotary switches on the circuit board. Each RTC
must have a unique address in the range 01-99. Each switch has an arrow pointer which serves also as a
screwdriver slot. Use a small screwdriver to rotate the arrowhead on each switch until the left arrowhead
points to the first digit, and the right arrowhead to the second digit of the correct address.
Relay Output Number Controlled Device
1Fan
2Dam
p
er
3 Coolin
g
, Sta
g
e 1
4 Cooling, Stage 2
5 Coolin
g
, Sta
g
e 3
6Heatin
g
, Sta
g
e 1
7Heatin
g
, Sta
g
e 2
8Heatin
g
, Sta
g
e 3
3-30 System Manual RC.IU.B1.22 4/99.1 AKCESS
Network Connections The RTC is connected to the I/O network at the terminal strip labeled “NETWORK”. When connecting
from board to board (point-to-point or “daisy-chain” wiring), use only twisted- pair cable meeting the
specifications given in the illustration below. There is no polarity to observe; connect the two signal
wires to the terminals labeled “A” and “B”, and the cable shield to the terminal labeled “shield”.
Sensor Connections Up to 8 sensors can be connected to an RTC board. The board has three sets of terminals for humidity
sensors and five sets for temperature sensors. Each set of terminals is dedicated and labeled for a
particular sensor. Although sensor leads can be up to 1000' long, when leads are over 100', take care to
calibrate and offset sensor readings (see Chapter 5 section 2 and use the Sensor Adjustment screen
selected from the appropriate Service menu).
Connect temperature sensor to GND and SIG terminals as shown in the following illustration; there is no
polarity requirement:
If your RTC is at
the end of a main
cable run, it has to
be terminated !!.
AKCESS System Manual RC.IU.B1.22 4/99.1 3-31
Connectingg
On/Off Inputs The RTC has four sets of terminals for on/off inputs. Each set of terminals is labeled with the name of
the device for which the terminals are intended.
Connecting
Relay Outputs Controlled loads are connected to their RTC terminals by wiring to the common and either the normally
open (“NO”) or normally closed (“NC”) screw terminals labeled for the particular load.
RTC Power
Connections Power connections (24 VAC, +10% / -15%) are made to the terminals labeled “24 VAC.”
Inspection of the
Installed RTC When an RTC Rooftop Controller is ready for operation, you should be able to observe the following,
proceeding clockwise around the board from the power terminal strip:
1. Power connections (24 VAC) have been made to the “24 VAC” terminal.
2. Controlled loads are connected to the relay output terminal strips (labeled C, NO, and NC for
Common, Normally Open, and Normally Closed) for Fan, Damper, Cool 1, etc.
3. Loads to be monitored are connected to the on/off input terminals (labeled N and L for Neutral
and Line) for appropriate devices.
4. Connection has been made to the I/O network of an AKC 55 at the “NETWORK” terminals.
5. Sensor connections have been made to the terminal strips labeled for Zone Humidity, Outside
Humidity, Zone Temperature, etc. For temperature sensors, only SIG and GND connections
have been made, and for humidity sensors, 12V, SIG, and GND have been connected.
6. The Service LED will normally blink briefly when the network is scanned, but if the service
LED remains steadily on, or blinks constantly, the RTC board is defective and should be
replaced.
7. If this board is the last node on a run, make sure that it is terminated by using one of the
terminators supplied with the AKC 55.
-
1
-
2
-
3
-
4
-
5
-
6
-
7
Danfoss AKC 55 System
The Danfoss AKC 55 System is a powerful and versatile control system for HVAC applications. It offers a wide range of features and capabilities to help you optimize the performance of your HVAC system and improve occupant comfort.
Key features of the Danfoss AKC 55 System:
- Scalable architecture: The AKC 55 System can be scaled to meet the needs of any size HVAC system, from small single-zone systems to large multi-zone systems.
- Wide range of I/O modules: The AKC 55 System offers a wide range of I/O modules to support a variety of sensors and actuators. This allows you to customize the system to meet the specific needs of your application.
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