13
INSTRUCTION MANUAL
AIR HEATER TYPE TR
CAUTION!
Connect the cable’s earth shield only to the
earth terminal inside the air heater. Do not connect the
other end of the cable’s earth shield.
NOTICE
A cable with a thickness of less than 0.8 mm will
result in a poor signal.
NOTICE
A cable that is not shielded and twisted may
result in a disturbed communication in an EMC-unfriendly
environment.
4.5.2 Modulating room thermostat installation
To connect the air heater to an MTS or MTC thermostat, do
the following:
1. Connect the two control wires to terminals 4 and 5
(see figure 8 or the electrical wiring diagram in §11).
a. Set the S1 and J14 switches on the control
unit as follows (figure 9/10):
b. Set S1 to 1.
c. Set J14 to 1.
NOTICE
The air heater must be switched off when setting
the switches. Otherwise the settings will have no effect.
Figure 8 - Modulating thermostat connection
1 2 3 4 5 6 7 8
ON
1
0
S1
J14
Figure 9 - Positions of the S1 and J14 switches
Figure 10 - 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 11):
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.
PE
L
5
4
N
5
4
5
4
5
4
22°C
L
N
PE
L
N
L
N
PE
L
N
L
N
PE
L
N
L
N
1
2
3
...8
22°C
L
Ne
ut
al
4 5
L
Ne
ut
al
4 5
L
Ne
ut
al
4 5
1 2 3 4 5 6 7 8
ON
1
0
1 2 3 4 5 6 7 8
ON
1
0
S1
J14
1 2 3 4 5 6 7 8
ON
1
0
1
2
3
Figure 11 - 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 12):
a. Set the S1 switch of the first air heater to 1.
b. Set the S1 switch of the other air heaters to 2.
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.
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