
To connect the air heater
• Connect the two thermostat wires to terminal 6 &
7 (see gure 14 or the electrical wiring diagram).
This is a 24 V connecon for the thermostat
signal.
NOTICE Never combine these connecons with the
terminals 6 and 7 of other air heaters.
NOTICE Always use separate relays for each air heater.
NOTICE Do not connect an external power source to
these terminals. These terminals need a dry contact.
The heater will always run for a minimum of 30 seconds,
even if the heat demand stops. This is to avoid large
amount of starts and stops.
Aer this, the fan will run for 2 - 3 minutes to cool down,
depending on the temperature.
When the cooling me has passed, a new heat request
will be granted.
The air heater can funcon as a de-stracaon fan. This
is called delta-T regulaon and it is done via the room
thermostat, with a temperate measurement sensor that
is located on the air heater.
The system fan is acvated when the temperaturedier-
ence between the sensor on the heater (the delta-T
NTC sensor) and the sensor in the thermostat is bigger
than 8OC (standard factory seng). This procedure en-
sures an even distribuon of temperature throughout the
building, thus acng as a fully automac de-stracaon
fan.
Delta-T regulaon can be switched o when it is not de-
sired (e.g. when it causes discomfort). This can be done in
the Sengs menu on the room thermostat. See the user
manual of the special Room thermostat for more informa-
on.
NOTICE Delta-T regulaon is automacally switched
o when the delta-T sensor (sensor terminal J6) is
disconnected.
The fan can be set to run in the summer. Follow the in-
strucons in the user manual of the special Room ther-
mostat.
The air heater’s heat exchanger and ue system are both
protected from excessive temperatures.
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 heang process to stop. Depending on the
temperature, the air heater performs the following
acons:
• Step 1: Power reducon (when possible).
• Step 2: Burner stop, followed by an automac
restart when cooled down (thermostat display).
• Step 3: Burner stop, followed by a Lock Out. A
manual reset is required. (thermostat display).
NOTICE A manual reset can be done on the electronic
circuit board or remotely with the special room thermo-
stat.
Prior to packaging, the safety and funconing of each
air heater is checked in detail. It is also set to the right
combuson eciency.
In general, the heater does not need to be adjusted aer
installaon. It is only necessary to perform a funconal
check and to obtain a ue gas analysis and record it for
later reference.
Once the unit is installed according to this manual,
the unit can be commissioned. To do so, follow these
instrucons:
1. Switch on the electric supply with the
maintenance switch.
You are now able to observe the rst start-up and become
familiar with the funconing of the heater.
1. Instruct the end user about safe use of the air
heater:
Fig. 13
NOTICE
NOTICE
NOTICE
NOTICE
NOTICE