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because of the high resistance too little air is moved and therefore also too little gas.
The pressure in the outlet flue for example, will normally never be above 30 Pascal.
Non modulating system fan
• System fan (M1) does not start or does not vary in speed; Check first the functioning of
this fan by connecting it to 230 Volts. Check with a multi-meter if the different lower
tensions are secondary present on the transformer as well. The fuse could have failed.
If the motor and transformer are OK, the cause of the problem must be in the heater
control, as the heater control dictates the different voltages from the transformer to the
fan-motor. In that case, replace the heater control.
8
Maintenance / spare parts
The heater must be inspected and cleaned regularly (once a year) by a qualified installer who
understands this appliance.
This is all the more important as the circumstances are heavier, especially in case of dust,
humidity, high frequency of switching on/off etc.
Activities:
8.1 General inspection
Check the overall condition of the installation. Check the heater, the thermostat, the wires
•
and the gas line.
Clean and inspect the condensate pipes and the siphon every year. Always fill the siphon
•
after cleaning with water to prevent flue gas escaping in the room.
8.2 Inspection of the heater
Before starting the inspection, switch off the electric power to the heater with the maintenance-
switch and close the manual gas valve.
Take out the burner, complete with flange and pre-mix fan, by unscrewing the 6 off M6
•
socket screws and you have taken off the ignition and fan wires
Check the heat exchanger from the inside for dirt and/or damage.
•
Check the burner on damage and clean the ignition electrode if necessary . CAUTION: do
•
not twist the electrode out of shape!
Check the air supply and the flue discharge.
•
Clean eventual the inside of the heater with a vacuum cleaner.
•
In case the heat exchanger is dirty on the outside, clean it with a soft brush. Never use a
•
steel wire brush!
Clean the fan-grid with a vacuum cleaner and a brush.
•
Put the burner back in (renew the gasket)
•
After this, check the heater on efficiency of combustion and adjust these if necessary
Check the heater operates correctly.
8.3 Ignition electrode
For the correct ignition of the burner it is important that the ignition
electrode is adjusted right.
The distance between the electrode and the burner should be
•
5.0 ±0.5 mm.
The distance between the two electrodes should be 3.6 ±0.4
•
mm.
Check the setting of the ignition electrode, the spark has to be
•
formed between the electrodes and not between the electrode and the burner.
9 Examples electrical installation:
9.1 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).
Instructions condensing Air heaters type XR version XR-GB-4001-a
Page 20/25
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