6 Operation
Rittal air/water heat exchanger assembly instructions
19
EN
6.2.6 Bus connection
(only when interconnecting several units
with an e-Comfort controller)
When using several air/water heat exchangers,
the serial unit interface can be used to connect up
to ten air/water heat exchangers with the bus cable
(Model No. 3124.100).
When interconnecting, please note the following:
– De-energise the air/water heat exchangers to
be connected.
– Ensure proper electrical insulation.
– Make sure the cables are not laid in parallel to
power lines.
– Make sure that the lines are short.
Fig. 23:
Connection example: Master-slave operation
Key
1
Serial interface
2
Serial interface cable
3
Master-slave bus cable (Model No. 3124.100)
RTT Rittal TopTherm air/water heat exchanger
X1
Supply connection/Door limit switch/Alarms
X2
Master-slave connection Sub-D, 9-pole
X3
Serial interface Sub-D, 9-pole
St.
Sub-D connector, 9-pole
Bu.
Sub-D jack, 9-pole
Adr. Address
Fig. 24:
Connection example: Door limit switch and master-slave operation
Key
1
Master air/water heat exchanger
2
Slave air/water heat exchanger
3
2-door enclosure with two door limit switches
4
Enclosure with door limit switch
Note:
The electrical signals at the X2 interface are
of an extra-low voltage (not extra-low safety
voltages in accordance with EN 60 335-1).
X2
CMC
RTT
Master
Adr.: 09
X1
X2
X3
X1
X2
X3
X1
X2
X3
X1
X2
X3
X2
X3
X2
X2
X2 X2
X2
X2
St.
St.
St.
Bu.
St.
Bu.
X2
Adr.: 11
Adr.: 12
RTT
Slave
RTT
Slave
Adr.: 19
RTT
Slave
St.
Bu.
St.
Bu.
3
2
1
X10
L
1
L
2
N
PE
1 2 3
4 5
1
X10
X10
X10
X10
X10
X2
X2
X2
X2
X2
X2
X2
L
1
PE
1 2 3
4 5
L
1
L
2
N
PE
1 2 3
4 5
L
2
L
3
L
1
PE
1 2 3
4 5
L
2
L
3
L
1
PE
1 2 3
4 5
L
2
L
3
L
1
PE
1 2 3
4 5
L
2
L
3
L
1
L
2
N
PE
1
23
4
5
X10
2
3
4
5 6
1
Adr.: 06
Adr.: 11
Adr.: 12
Adr.: 13
Adr.: 14
Adr.: 15
2
2
2
2
2
3
4
4
3
2
Adr.: 16
