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6.3. Delta-T-regulation
The air heater can function as a de-stratification fan. This
is called delta-T regulation and it is done via the room
thermostat, with a temperate measurement sensor that is
located on the air heater.
The system fan is activated when the temperature-
difference between the sensor on the heater (the delta-T
NTC sensor) and the sensor in the thermostat is bigger
than 12
C (standard factory setting). This procedure
o
ensures an even distribution of temperature throughout
the building, thus acting as a fully automatic de-
stratification fan.
6.3.1.
Switch off delta-T-regulation
Delta-T regulation can be switched off when it is not
desired (e.g. when it causes discomfort). This can be
done in the Settings menu on the room thermostat. See
the user manual of the special Room thermostat for more
information.
NOTICE
Delta-T regulation is automatically switched
off when the delta-T sensor (sensor terminal J6) is
disconnected.
6.4. Summer ventilation
The fan can be set to run in the summer. Follow the
instructions in the user manual of the special Room
thermostat.
6.5. Overheating protection
The air heater's heat exchanger and flue system are both
protected from excessive temperatures.
7. Commissioning the air heater
7.1. Adjusting the settings
Prior to packaging, the safety and functioning of each
air heater is checked in detail. It is also set to the right
combustion efficiency.
18
6.5.1.
Heat exchanger
An NTC sensor is located near (or on) the heat exchanger.
This sensor monitors the heat exchanger temperature.
If the heat exchanger becomes too hot, this sensor will
cause the heating process to stop. Depending on the
temperature, the air heater performs the following actions:
•
Step 1: Power reduction (when possible).
•
Step 2: Burner stop, followed by an automatic
restart when cooled down (display: E05 / E36).
•
Step 3: Burner stop, followed by a Lock Out. A
manual reset is required. (display L15).
NOTICE
A manual reset can be done on the electronic
circuit board or remotely with the special room thermostat.
6.5.2. Flue system
A flue sensor (NTC) is located in the flue system of the air
heater. This sensor monitors the flue temperature.
If the flue system becomes too hot, this sensor will
cause the heating process to stop. Depending on the
temperature, the heater performs the following actions:
•
Step 1: Power reduction (when possible).
•
Step 2: Burner stop, followed by an automatic
restart when cooled down.
•
Step 3: Burner stop, followed by a Lock Out. A
manual reset is required. (display L16).
6.6. Flue passage check
The air heater is equipped with a pressure switch that
checks the passage of combustion air through the heat
exchanger. The pressure switch checks if there is sufficient
movement of combustion air through the heat exchanger
(only during the pre-purge phase). If the pressure
difference is too low, the air heater will not start. Error L-14
will be shown on the display.
In general, the heater does not need to be adjusted after
installation. It is only necessary to perform a functional
check and to obtain a flue gas analysis and record it for
later reference.
CAUTION!
Use only calibrated instruments to adjust the
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Troubleshooting
