22
Case 16:
Flame detected before opening the gas valve.
• Check if there really is a flame before ignition. If so:
–
Replace the gas valve.
• Check if the ionisation electrode is wet. If so:
–
Dry, clean or replace the electrode.
Case 19:
Heater configuration error
• The heater does not know which program to run,
due to a mismatch between the burner control unit
and the display. If so:
–
Contact your supplier.
9.5 Further troubleshooting
When the air heater does start but shows a different
problem than described above, check if the following
problems apply.
9.5.1
Explosive ignition and/or frequent flame failures
• Check if the gas control settings are correct (see
§8.1). A correct CO
2
value is important for a proper
ignition.
• Check the ignition cable. It should have a
resistance of 1 kΩ.
• Check the position of the ignition electrode.
The spark has to be formed between the two
electrodes, not between the electrode and the
burner.
10 Maintenance
CAUTION!
The air heater must be inspected and
cleaned once a year by a qualified installer with sufficient
knowledge about the device.
CAUTION!
Sufficient maintenance is critical in
circumstances such as high humidity, dust, high switching
on/off frequency, etc.
10.1 Preparation
Before performing maintenance on an air heater that is
already installed, do the following:
1. Set the thermostat to the lowest setting.
2. Close the manual gas valve.
3. Turn off the power supply to the air heater using the
maintenance switch.
CAUTION!
Always check for gas leaks after working on
the air heater.
CAUTION!
Do not use water when cleaning the air heater.
CAUTION!
The heater must be electrically isolated during
servicing.
Water can be used to clean the air heater.
CAUTION!
Only the heat exchanger can be cleaned with
a pressure washer. Do not use a pressure washer on the
following parts:
• The big fan motor on top of the air heater.
• The electronics housing.
• The temperature sensor in the front part of the air
heater.
10.2 Basic maintenance
To perform basic maintenance on the air heater, do the
following:
CAUTION!
When cleaning parts of the air heater, use
a dry cloth, brush, compressed air or a vacuum cleaner.
Never use a steel brush.
1. Inspect the outside of the heat exchanger.
2. Clean the fan guard on the outside of the heater.
Clean the fan blades if required.
3. Open the access panel.
4. Clean the inside of the air heater. Focus on the fol-
lowing parts:
–
Body
–
Fan blades and motor
–
Heat exchanger
–
Temperature sensor
–
Vane switch (if present)
5. Check if the wiring, nuts and bolts are properly
secured and tightened.
6. Grease any parts and bolts that are regularly loos-
ened for maintenance.
7. Open the manual gas valve in the supply line and
check if the supply lines are air tight, do not leak
and do not contain air.
