10
User
Guide RS8FZ402 © Danfoss 2015-07
EKC
313
Necessary connections
Terminals:
25-26
Supply voltage 24 V a.c.
18-19
Pt 1000 sensor at the heat exchanger discharge on
the cool side (S2)
18-20
Pt 1000 sensor at the heat exchanger input on
the warm side (S3)
14,15,16 Type AKS 2050* pressure transmitter, -1 to 59 bar.
Mounted at the heat exchanger's inlet on
the warm side (Pc)
14,16,17 Type AKS 32R* pressure transmitter, -1 to 12 bar.
Mounted at the heat exchanger discharge on
the cold side (P0)
Connections
Application dependent connections
Terminals:
1-2
DI input for external main switch (also see r12). If no
switch is mounted, the terminals should be short circuited.
12-13 Relay for controlling solenoid valve in liquid line or the
relay can be used as alarm relay (see o36).
Valve control: 12 and 13 are connected under normal
operating conditions and interrupted supply voltage.
Disconnects when regulation requires a low valve open-
ing degree.
Alarm relay: 12 and 13 are connected in case of alarm.
21,22,23,24 Connecting an ETS valve. (Terminals 21 through 24
should not be used when using an ICMTS valve instead
of an ETS valve. ICMTS valves should be controlled via the
0-10 V signal on terminals 5 and 6.)
5-6
Voltage output 0-10 V. Can be used for the valve's opening
degree signal or to control an ICMTS valve.
(For a special use with a solid state relay and AKV, the
output will pulse with 10 V on/off)
3-4
Data communication
Mount only, if a data communication module has been
mounted.
It is important that the installation of the data communi-
cation cable be done correctly. Cf. separate literature No.
RC8AC...
At opening degree: 10 V = 100% open valve
At signal to ICAD/ICMTS: 10 V = Open valve
8 VA
Cable connection
060G1034
14 = black
15 = brown
16 = blue
AKS 11: Max. 100°C
AKS 21: Max. 180°C
L > 5 m, see page 12
5,6 25,26
l
Earthing will damage the
controller
*) For explosive applications an intrinsically safe pressure transmitter can
be used. Connection is shown on page 12.
