Instructions condensing Air heaters type HR
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12
Examples electrical installation
12.1 Thermostat cable
In all cases the communication between the heater and the
thermostat is based on a two wire, low-voltage connection. In
the appliance the wire for the thermostat has to be connected to
connection 4 and 5 (see also electrical wiring diagram).
Cable specification: signal cable, 1x2x0,8 (shielded
and twisted)
Maximum length 200m.
If the cable is chosen too thin, the signal will become too poor. If
the cable is not shielded and twisted the signal me become disturbed in an EMC unfriendly
environment.
Keep the thermostat cable separated from mains cables. Connect the earth shield of the cable
only to the earth terminal in the heater.
If these guidelines are not followed it may result in malfunction of the installation or worse, it
could damage the thermostat or the electronics in the heater.
Never mount the thermostat near aerials of internal communication networks.
These emit radiation that could lead to disturbance of the thermostat. Always keep
some meters distance.
12.2 Installation with modulating room thermostat
•
Connect the heater to 230Vac
•
Connect the thermostat to the terminals according to the
diagram. (terminal 4 and 5)
•
On the print the switches S2 and
S3 need to be set as follows: S2
switch 1 at the ON position, and S3
at 1.
The change of these switches need to be performed without
power on the Heater, otherwise these settings take no effect.
12.3 Installation of more heaters on one
thermostat
One room thermostat can control 8 heaters. To connect
the heaters is very simple. The two wires for the
thermostat can be connected to heater one, from heater
one to heater two , from heater two to heater three etc.
etc. Connect always on terminal 4 and 5. See also the
diagram.
Standard factory setting: switch 1 “on”.
Each heater needs his own unique number to recognise
the heater by the room thermostat. The number of the heater can be set by the micro switch on
the heater control HC in the heater. The number at the upper position of the switch is the given
number for that heater. Make sure that each heater has is own unique number. If more than one
heater have the same number the system does not work.
The change of these switches need to be performed without power on the Heater, otherwise
these settings take no effect.
1 2
5
4
3
N
e
u
ta
l
L
(2
3
0
V
A
C
)
22°C
Thermostat (bus)
Installer
1 2
5
4
3
N
e
u
ta
l
L
(2
3
0
V
A
C
)
22°C
Thermostat (bus)
Installer
1 2 3 4 5 6 7 8
ON
1
0
S3
S2
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
Heater 1
Heater 2
Heater 3
0
1
S2
S3
0
1
0
1
