16
Manual RS8EL402 © Danfoss 03-2010
AK-PC
420
Terminals:
1-2
Supply voltage 24 V a.c.
4- 15 Relay outputs for fan motors
16-19 Relay output to pump 1 and pump 2
20-21 Relay output to heat recovery
22-24 Alarm relay
There is connection between 22 and 24 in alarm situa tions
and when the controller is dead
27-28 24 V signal to start / stop of regulation
27-29 24 V signal from the safety circuit fan 1
27-30 24 V signal from the safety circuit fan 2
27-31 24 V signal from the safety circuit fan 3
27-32 24 V signal from the safety circuit fan 4
27-33 24 V signal from the safety circuit fan 5
27-34 24 V signal from the safety circuit fan 6
27-35 (not used)
27-36 24 V signal from flow switch
37-38 Output signal 0-10 V d.c. to either 3-way valve or frequen-
cy transformer for fans
39-41 Possibility of connecting an external display type EKA 163
for display of Pc
42-44 Possibility of connecting an external display type EKA 164
for operation and temperature display
45-46 DI1 - Contact function for alarm signal
45-47 DI2 - Contact function for alarm signal
48-49 DI3 - Contact function for alarm signal
48-50 HP safety - contact function for receiving of high pressure-
safety signal
51-52 Heat recovery - Contact function for receive of signal to
start of heat recovery
51-53 S7 sensor. Sensor signal from AKS 11, AKS 12 or EKS 111
54-55 Sc3 sensor. Sensor signal from AKS 11, AKS 12 or EKS 111
54-56 S8 sensor. Sensor signal from AKS 11, AKS 12 or EKS 111
57-58 Signal for displacement of reference. 0-10 V d.c.
60-62 Condenser pressure. Voltage signal from AKS 32R.
Connections
Data communication
25-26 Mount only, if a data communication module has been
mounted.
For Ethernet communication the plug connection RJ45
must be used. (LON FTT10 can also be connected in this
way.
It is important that the installation of the data communi-
cation cable be done correctly. Cf. separate literature No.
RC8AC.
Common Pc signal
If AK-PC 420 is used together with another control for compres-
sors, e.g.:
AK-PC 530
AK-PC 730
AK-PC 840
AK-CH 650
the same AKS 32R can emit a signal to both controls. But in this
case separate 24 V power supplies must be used for the two con-
trollers. In addition to this, the safety limit for “high condensation
pressure” is set at the same value in the two controllers.
All inputs are low-voltage. All
relay outputs may be high-
voltage.
Pc: AKS 32R:
1 = Black = +
2 = Blue = -
3 = Brown = s
