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Bus com
4
PE
5
Figure 4
- Bus communication connection
S1
ON
1
0
1 2 3 4 5 6 7 8
Figure 5
- Positions of the S1 and J14 switches
Figure 6
- Location of the S1 and J14 switches
4.5.3. Installation of multiple heaters on one control unit
An MTC or MTS room thermostat, or interface module can
control up to 8 air heaters. To connect the air heaters, do
the following (figure 7):
NOTICE
This functionality does not apply to an ON/OFF
thermostat.
1. Connect the two wires of the thermostat to termi-
nals 4 and 5 of the first air heater.
2. Connect the first air heater to the second air heater.
3. Repeat for each subsequent air heater.
10
RT
7
6
J14
2
1
N
L
N
L
PE
N
L
4
5
PE
N
L
4
5
22°C
4
5
4
5
4
5
22°C
Figure 7
- Connection of multiple air heaters to a
modulating room thermostat
Each air heater needs an unique number to be recognised
by the room thermostat. This number can be set with the
J14 switch on the control unit of each air heater:
1. Set the S1 and J14 switches on the control unit as
follows (figure 8):
a. Set the S1 switch of the first air heater to 1.
b. Set the S1 switch of the other air heaters to 0.
c. Set the J14 switch of the first air heater to 1.
d. Set the J14 switch of the second air heater to
2, etc.
S1
ON
1
0
1 2 3 4 5 6 7 8
ON
1
0
1 2 3 4 5 6 7 8
ON
1
0
1 2 3 4 5 6 7 8
Figure 8
- Positions of the S1 and J14 switches for the
first three air heaters in a system
NOTICE
If the J14 switch of more than one air heater is
set to the same number, the system will not work.
NOTICE
The air heater must be switched off when setting
the switches. Otherwise the settings will have no effect.
3
...8
N
L
N
L
PE
N
L
4
5
4
5
PE
N
L
S1
J14
1
ON
1
0
1 2 3 4 5 6 7 8
2
ON
1
0
1 2 3 4 5 6 7 8
3
ON
1
0
1 2 3 4 5 6 7 8
J14
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Troubleshooting
