AKC 25H1
Function description
RC.1J.Z4.02
©
Danfoss
09/1999
15
The controller must be supplied with 230 V a.c., with live connected to terminal No. 2. It is a
requirement that the controller has earth connection. It is installed at the terminal next to the
mains connection.
A 1 A slow-blowing Ø5 x 20 mm fuse should be mounted in series with the live.
The controller has been factory-set at a network frequency of 50 Hz. If the supply is 60 Hz, the
setting must be changed to this value.
Main function
Main switch
Mains freq
____
The controller has two functions that can start and stop the regulation. A function switch inside
the unit that can be set via the control function and an external input that can be connected to
a switch.
Internal
The switch has three positions:
- Normal regulation
(setting = +1)
- Regulation stopped
(setting = 0)
- Service function.
(setting = -1)
Main function
Main switch
Main switch
+1/0/-1
If the switch is set in pos. 0 or -1, all the controller’s functions are inactive. An alarm with the
text “Standby mode” is generated to indicate that regulation has stopped. If the switch is in
pos. +1, regulation has begun for the functions selected with “ON”.
External
If the external function switch is used, a switch for the “Main Switch” input must be connected.
If it is not used, the input must be shortcircuited. There are two menu groups that only can
be set when the MAIN SWITCH input is interrupted. The two groups are the following:
“Input Configuration” and “Output Configuration”.
The combination of internal and external switch is, as follows:
- Regulation is only carried out when both switches are in pos. ON (internal = +1 and external
= shortcircuited).
- Service settings can be made when the internal switch is put in pos. “Service Function”
(setting = -1) External = shortcircuited.
- All other combinations will stop the regulation.
The controller contains a clock function. Setting of days, hours and minutes can be performed
here.
AKC 25H1 Adr: --
Clock: day:
1-7 (1=Monday, 7=Sunday)
AKC 25H1 Adr: --
Clock: hour:
0-23
AKC 25H1 Adr: --
Clock: min:
0-59
Note:
If the controller is connected to an installation with gateway, type AKA 243/244, the gateway
will reset the clock function after a power failure.
Supply voltage
Function switch
(Main Switch)
Sensor failure
If a missing signal from one of the connected temperature sensors or pressure transmitters is
registered, an alarm will be given. If it is PO (the pressure transmitter for the suction pressure)
that fails, the refrigeration will immediately be stopped. If it is the Pc unit (the pressure
transmitter for the condensing pressure) that fails, the whole condenser capacity will be cut in.
Clock function
