17
INSTALLATION MANUAL
AIR HEATER TYPE DXC
6.2 Minimum firing time
The heater will always fire for a minimum of 1 minute, even
if the heat demand stops. This is to avoid a large amount of
start and stops.
NOTICE
The heater will try to ignite 2 times before it stops
and gives an error.
6.3 Summer ventilation
The fan can be set to run in the summer. Follow the
instructions in the user manual of the special Room
thermostat.
6.4 Overheating protection
The air heater's heat exchanger and flue system are both
protected from excessive temperatures.
6.4.1
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 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.
If the pressure difference is too low, the air heater will stop.
Error L-14 will be shown on the display.
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.
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
air heater.
CAUTION!
Never carelessly turn the adjuster screws.
NOTICE
Adjusting the control without a supporting flue
gas analysis voids the warranty.
Only adjust the burner pressures if they differ more than
0,5 mbar from its setting.
7.2 Commissioning the air heater
Once the unit is installed according to this manual, the unit
can be commissioned. To do so, follow these instructions:
1. Make sure the gas supply pipe is clean, gas tight
and free from air.
2. Switch on the electric supply with the maintenance
switch.
You are now able to observe the first start-up and become
familiar with the functioning of the heater.
NOTICE
If the gas line is not purged correctly, the heater
will attempt to start twice before going into a lock-out
condition. In this case, manual reset is necessary.
1. Instruct the end user of the about a safe use of the
air heater:
a. The presence of gas
b. The location of the manual gas valve
