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• 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 250m.
If the cable is chosen too thin, the signal will become too poor. If the cable is not shielded and
twisted the signal might 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.
4.3.4 Fuse
On the heater control board there is 1 fuse. See electrical wiring diagram.
F1 and in the power supply of the heater. Replace the fuse only by a fuse of the same type, 5AT
4.4 Air intake / combustion products discharge
Check for compliance with local / national regulations.
Only the described flue material may be used. This goes for the roof or wall terminal and also
for the piping between the heater and the terminal. Only so the installation is approved.
Do not use terminals for condensing appliances. This can lead to water inside the flue system.
In some cases the roof terminal has to be at least 0,5m above roof level (depending on local
regulations).
Pay attention on fresh air ventilation openings on the building. There are local distance
restrictions on placing a flue terminal near the ventilation openings.
4.4.1 Flue material
It is only allowed to use CE marked flue material from the manufacturer Muelink & Grol (M&G)
and Burgerhout, type Alu-fix temperature class minimum T250. These Flue systems can be
bought at your supplier.
Only use one flue pipes from the same diameter as the flue spigots on the heater.
Different manufacturers have different connections systems from the flue pipes. It is not allowed
to combine systems from different manufacturers.
4.4.2 Maximum flue length
The maximum pressure drop in either the air supply pipe, or the flue pipe ,must not exceed 9
metres straight pipe , excluding the terminal. Whenever bends are used the pressure drop is
greater and therefore a 90° bend will count as 2 metres and a 45° bend as 1 metre. All flue
pipes must be of the same diameter as the flue spigots on the heater, and all flue joints must be
sealed. For further information regarding the flue system please contact your reseller.
Instructions condensing Air heaters type XR version XR-GB-4001-a
Page 10/25
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