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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.
INSTALLATION MANUAL AIR HEATER TYPE DXE
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.
Some checks can only be performed when the heater is
running. Do the following:
1. Reconnect the air heater to the power supply.
2. Switch on the air heater.
3. Check if the heater operates without problems. See
§9. if any errors occur.
4. Check the air heater's combustion efficiency. If
necessary:
– Adjust the burner settings (see §8.1.).
10.3. Maintenance of the burner unit
The burner unit is an important part of the air heater and
requires special maintenance.
To perform maintenance on the burner unit, do the
following:
1. Disconnect the ignition and ionisation cables from
the burner unit.
2. Disconnect the burner manifold from the gas valve.
This is a clamp coupling.
3. Remove the burner assembly from the air heater,
4. Check the burner for damage, corrosion and align-
ment of the separate burners.
a. Clean with a brush.
5. If necessary, clean the electrodes.
CAUTION!
Do not twist the electrode out of shape.
6. Check the inside of the heat exchanger for dirt and/
or damage. If necessary:
– Clean the heat exchanger.
7. Disassemble the motor part from the flue fan. The
housing can remain on the heater.
8. Clean the inside of the flue fan.
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