Winterwarm DXE80 User manual

EN - v2.8 / 01-2023
Installation manual
Air heater
Type DXE

Contents
1. Introduction 3
1.1. Symbols used in this manual 3
1.2. Warranty 3
2. Safety instructions 4
2.1. Installation 4
2.2. Use 4
2.3. Maintenance & Cleaning 4
2.4. Children and vulnerable users 4
3. Technical specifications 5
3.1. Performance 5
3.2. Gas types 6
3.3. Dimensions 7
4. Installation 8
4.1. Preparation 8
4.2. Positioning the air heater 8
4.3. Gas type & connection 8
4.4. Electrical connection 9
4.5. Room thermostat 9
5. Flue systems 11
6. Operating the air heater 12
6.1. Burner cycle 12
6.2. Manual operation 12
6.3. Minimum firing time 12
6.4. Summer ventilation 12
6.5. Overheating protection 12
6.6. Flue passage check 13
7. Commissioning the air heater 14
7.1. Adjusting the settings 14
7.2. Commissioning the air heater 14
8. Combustion settings 15
8.1. Adjusting the burner settings 15
8.2. Converting to another gas type 15
9. Troubleshooting 16
9.1. Volatile lock outs 16
9.2. Temporary errors 16
9.3. Warnings 17
9.4. Instructions 17
9.5. Further troubleshooting 18
10. Maintenance 19
10.1.Preparation 19
10.2.Basic maintenance 19
10.3.Maintenance of the burner unit 19
10.4.Extensive maintenance in poultry sheds 20
11. Electrical wiring diagram 21
12. Exploded view and spare parts 22
13. Disposal and recycling 23
14. Declaration of conformity 23

3INSTALLATION MANUAL AIR HEATER TYPE DXE
1. Introduction
This manual is intended for the gas, electrical and
mechanical installer.
This document gives instructions on how to use and
maintain the air heater. It is most important to follow the
instructions in this document for safe operation of this air
heater.
It is important to read this document before starting the
installation process. Store this document close to the air
heater for quick reference.
1.1. Symbols used in this manual
WARNING! Indicates a potentially dangerous situation
that could lead to death, severe injury or serious product
damage.
DANGER! Indicates a dangerous situation that would lead
to death or severe injury.
CAUTION! Indicates a potentially dangerous situation
that could lead to injury or product damage.
NOTICE Indicates important information that is not
directly related to safety.
1.2. Warranty
NOTICE Using, installing or maintaining this air heater in
any other way than described in this manual may cause
damage that voids the warranty.
NOTICE Failing to follow the safety instructions in this
manual can lead to damage to the air heater or the
installation and void the warranty.

4
2. Safety instructions
Always follow the safety instructions in this chapter when
installing, using or performing maintenance on this air
heater:
2.1. Installation
CAUTION! This air heater must be installed and
maintained by an authorized, qualified and competent
installer, using calibrated equipment.
NOTICE This air heater must be installed and maintained
in accordance with this manual, national and local building
regulations and local health and safety regulations.
2.1.1. Protection against dust
CAUTION! Cover the air heater while spreading sawdust
on the floor. This prevents large amounts of dust from
accumulating on the heater.
CAUTION! The air heater can be used in a dusty
environment (e.g. a poultry shed) if they are cleaned and
maintained more frequently.
2.1.2. Temperature
CAUTION! Do not install the heater in places where the
temperature can rise above 40°C. Higher temperatures
cause the internal components to degrade much faster.
2.1.3. Corrosive vapours
WARNING! Do not install the air heater in areas that
contain any corrosive or explosive vapours. Corrosive
vapours (e.g. containing Chlorine) that are sucked into the
air intake will cause corrosion of the heat exchanger and a
leakage of condensate and flue gas. This is also the case
for the room thermostat.
2.2. Use
CAUTION! Make sure the area around the air heater is
dry when performing maintenance on the air heater.
CAUTION! Always close the doors and inspection hatches
of the air heater, except when adjusting and checking the
appliance.
2.3. Maintenance & Cleaning
Frequent maintenance and cleaning of the air heater is
necessary to ensure safe and proper operation. Failure
to do so could lead to damage to the heater or its
surroundings and void the warranty.
CAUTION! Air heaters installed in a dusty and/or wet
environment must be maintained and cleaned more
frequently.
CAUTION! Air heaters installed in poultry sheds must be
maintained and cleaned after every breeding cycle.
2.3.1. Protection from water (IP class)
WARNING! Never use water when cleaning electrical
parts.
This air heater is protected against splash water and has
an IPX4D classification.
WARNING! Do not use a pressure washer to clean parts
that contain electronics, such as the electric motor or the
machine cover.
2.3.2. Disinfecting fluids
CAUTION! Some aggressive disinfection fluids can
damage the heater. When using such fluids, cover the
heater while disinfecting the shed.
2.4. Children and vulnerable users
WARNING! This air heater can be used by children aged
8 years and above and by persons with reduced physical,
sensory or mental capabilities or lack of experience and
knowledge, if they are supervised or instructed concerning
use of the appliance in a safe way and understand the
hazards involved.
WARNING! Children shall not play with the air heater.
WARNING! Children shall not clean and maintain this air
heater without supervision.

5INSTALLATION MANUAL AIR HEATER TYPE DXE
3. Technical specifications
3.1. Performance
Technical specification Unit Type DXE v4.1
DXE80 DXE100
Net nominal heat input (max.) kW 83.0 108
Net nominal heat input (min.) kW 53.5 73.5
Heat output (max.) kW 75.9 99.1
Heat output (min.) kW 47.9 65.8
Eciency at max. power % 91.5 91.8
Eciency at min. power % 89.5 89.5
Air output (max.) m3/h 8000 10,000
Throw horizontal (max.) m 45 50
Gas connection G” 3/4" 3/4"
Electrical connection (50 Hz) V 230 230
Electrical power consumption kW 0.9 1.4
Stand-by electrical power
consumption
kW 0.004 0.004
Electrical current (max.) A 3.9 6.1
Protection class - IPX4D
NOx emission (GCV) mg/kWh 126 135
NOx class - 3 3
Flue gas amount (max.) kg/h 150 199
Chimney flue pressure (max.) Pa 40 60
Pressure switch point Pa 160 180
Thermostat connection - 2-wire low voltage communication bus or ON/OFF
Flue length (max.) m 9 9
Weight kg 150 175

6
3.2. Gas types
3.2.1. Natural gas G20
Specification Unit Natural gas G20
Nominal supply pressure mbar 20
Supply pressure (min. - max.) mbar 17-25
Gas category - II2H3P B/P
NL: II2EK3B/P
DE: II2ELL3B/P
BE: I2E(s), I2Er
FR: II2Er3B/P
PL: II2ELwLs3B/P
Class - B22, C12, C32
Specification Unit DXE80 DXE100
Gas consumption (max.) m3/h 8.8 11.4
Burner injectors n x Ømm 6x 3.7 8x 3.7
Burner pressure high mbar 7.4 7.7
Burner pressure low mbar 3.2 3.5
CO2High (indication) % 8.3 8.3
3.2.2. Propane
Specification Unit Propane G31 (P)
Nominal supply pressure mbar 30-50
Supply pressure (min. - max.) mbar 25-50
Gas category - II2H3P B/P
NL: II2EK3B/P
DE: II2ELL3B/P
BE: I3P
FR: II2Er3P
PL: II2ELwLs3B/P
Class - B22, C12, C32
Specification Unit DXE80 DXE100
Gas consumption (max.) m3/h 6.6 8.6
Burner injectors n x Ømm 6x 2.3 8x 2.3
Burner pressure high mbar 19.5 18.5
Burner pressure low mbar 8.1 8.5
CO2High (indication) % 9.2 9.5

7INSTALLATION MANUAL AIR HEATER TYPE DXE
3.2.3. Butane / LPG
Specification Unit Butane / LPG G30 (B/P)
Nominal supply pressure mbar 30-50
Supply pressure (min. - max.) mbar 25-50
Gas category - II2H3P B/P
NL: II2EK3B/P
DE: II2ELL3B/P
BE: I3B/P
FR: II2Er3B/P
PL: II2ELwLs3B/P
Class - B22, C12, C32
Specification Unit DXE80 DXE100
Gas consumption (max.) m3/h 5.0 6.5
Burner injectors n x Ømm 6x 2.3 8x 2.3
Burner pressure high mbar 15.0 14.5
Burner pressure low mbar 6.0 6.5
CO2High (indication) % 9.2 9.2
3.3. Dimensions
The dimensions of this air heater can be found in figure 1.
1030
2270
1030
DXE80 : 760
DXE100: 925
180
max. wall
300
190O
O130
205
310
Figure 1 - Dimensions of the DXE

8
4. Installation
4.1. Preparation
Before installation, please use the data badge to check:
• if the heater is in accordance with the order;
• if the heater is suitable for the local present
provisions (gas type, gas pressure, electrical supply
etc.)
Before leaving the factory, the air heater has been tested
for safety and has been set to the operating settings. It has
been configured for the type of gas that is stated on the
data badge. Should there be any doubt about the settings
that apply to your situation, please contact your supplier.
4.1.1. Standards
NOTICE The installation must comply with all applicable
local and national standards.
NOTICE The air heater must be installed in accordance
with the relevant requirements of the Gas Safety
regulations, Electrical installation regulations and or other
local regulations that may apply.
For United Kingdom only:
NOTICE The air heater must be installed in accordance
with the relevant requirements of the Gas Safety
regulations, Electrical installation regulations and or other
local regulations that may apply (e.g. The Institute of Gas
Engineers IGE UP-1 and 2, BS6230, BS5440 building
regulations and the IIE regulations that incorporate the gas
safety regulations).
4.2. Positioning the air heater
Keep the following requirements in mind when choosing a
location to install your air heater:
WARNING! Never install an air heater close to flammable
materials.
• Keep sucient distance between the heater and
any obstructions. This is both for safety reasons
and to allow access for service and maintenance
(figure ).
• Make sure the air flow to and from the heater is
free from obstacles at least 5 metres in front of the
heater. Also make sure the air intake is free from
obstacles.
• Make sure enough space remains to open the door
of the air heater.
• Make sure the wall can support the air heater.
• Ensure sucient clearance distance for the flue
system.
4.2.1. Orientation
• Install the heater horizontally without an inclination
(figure 2).
Figure 2 - A correct and incorrect horizontal
orientation
4.2.2. Suspension
4.3. Gas type & connection
The unit is suited for natural gas, propane or butane (LPG).
The specific gas type that a heater is set up for can be
found on the packaging labels and on the heater badge.
The heater can be converted to another gas type. Contact
your supplier for more information.
The working and standing supply pressure must be
a minimum of 17 mbar, and a maximum of 50 mbar,
measured at the inlet pressure nipple of the gas control in
the heater.
NOTICE The supply line’s manual isolation valve must be
placed within reach of the heater.
NOTICE All gas supply lines must be mounted without any
mechanical tension.
NOTICE Always clean the inside of a gas supply line
before connecting it to the air heater. Place a gas filter in
the supply line when needed.
CAUTION! When using pressures above 60 mbar to test
the supply lines, always close the manual isolation valve of
the air heater.

9INSTALLATION MANUAL AIR HEATER TYPE DXE
For United Kingdom only:
The supply line for gas must comply with the Gas
Engineers publications UP-1 and UP-2, as well as with BS
6891.
4.4. Electrical connection
The electrical installation must comply with local and
national requirements as well as IEE regulations.
4.4.1. Power supply
The air heater requires an earthed power supply of 230 V/
AC. A supply of 400 V/AC + Neutral is optional. The control
circuit is a two wire low voltage bus communication.
Figure 3 - The air heater's connection clamps
• The heater must be electrically isolated during
servicing. Use an isolation switch (min. 3 mm
contact opening gap), a power plug or a non-
switched fuse spur. See the electrical wiring
diagram in §11..
4.4.2. Fuse
One fuse is present on the air heater’s control board (see
the electrical wiring diagram in §11.).
• When replacing this fuse, always use one of the
same type (5AT).
4.5. Room thermostat
• by an ON/OFF signal;
• through a bus communication system with an
external interface.
4.5.1. Installation requirements
Following these requirements when placing the thermostat
to ensure the heater functions correctly:
• Make sure that air can circulate around the
thermostat.
• Make sure the sun does not shine directly upon the
thermostat.
• Do not place the thermostat on a cold wall.
• Place the thermostat on an inner wall free from
draught.
• Never place the thermostat within the throw of the
heater.
• Never mount the thermostat near the aerials of
internal communication networks. These emit
radiation that can disturb the thermostat. Keep
several meters distance.
In all cases, the communication between the heater
and the thermostat is based on a two wire, low-voltage
connection. (see the electrical wiring diagram in §11.).
Follow these instructions to prevent malfunction of the
installation and damage to the thermostat or air heater:
• Use a cable with the following specifications:
–Signal cable.
–Shielded and twisted.
–Minimum dimensions: 1 x 2 x Ø0,8 mm2.
–Maximum length: 200 m.
CAUTION! Keep the thermostat cable separated from the
mains cables.
CAUTION! Connect the cable’s earth shield only to the
earth terminal inside the air heater. Do not connect the
other end of the cable’s earth shield.
NOTICE A cable with a thickness of less than 0.8 mm will
result in a poor signal.
NOTICE A cable that is not shielded and twisted may
result in a disturbed communication in an EMC-unfriendly
environment.
4.5.2. Bus communication system installation
To connect the air heater to a bus communication system,
do the following:
1. Connect the two control wires to terminals 4 and
5 (see figure 4 or the electrical wiring diagram in
§11.).
2. Set the S1 and J14 switches on the control unit as
follows (figure 5 / 6):
a. Set S1 to 1.
b. Set J14 to 1.
NOTICE The air heater must be switched o when setting
the switches. Otherwise the settings will have no eect.

10
4567
PE
RT
Bus com
Figure 4 - Bus communication connection
1 2 3 4 5 6 7 8
ON
1 0
S1 J14
Figure 5 - Positions of the S1 and J14 switches
Figure 6 - Location of the S1 and J14 switches
4.5.3. Installation of multiple heaters on one control unit
An MTC or MTS room thermostat, or interface module can
control up to 8 air heaters. To connect the air heaters, do
the following (figure 7):
NOTICE This functionality does not apply to an ON/OFF
thermostat.
1. Connect the two wires of the thermostat to termi-
nals 4 and 5 of the first air heater.
2. Connect the first air heater to the second air heater.
3. Repeat for each subsequent air heater.
PE L5
4
N 5
45 45 4
22°C
L
N
PE L N
L
N
PE L N
L
N
PE L
N
L
N
123...8
22°C
L Neutal
4 5
L Neutal
4 5
L Neutal
4 5
1 2 3 4 5 6 7 8
ON
1 0
1 2 3 4 5 6 7 8
ON
1 0
S1 J14
1 2 3 4 5 6 7 8
ON
1 0
1
2
3
Figure 7 - Connection of multiple air heaters to a
modulating room thermostat
Each air heater needs an unique number to be recognised
by the room thermostat. This number can be set with the
J14 switch on the control unit of each air heater:
1. Set the S1 and J14 switches on the control unit as
follows (figure 8):
a. Set the S1 switch of the first air heater to 1.
b. Set the S1 switch of the other air heaters to 0.
c. Set the J14 switch of the first air heater to 1.
d. Set the J14 switch of the second air heater to
2, etc.
1 2 3 4 5 6 7 8
ON
10
1 2 3 4 5 6 7 8
ON
1 0
S1
J14
1 2 3 4 5 6 7 8
ON
10
Figure 8 - Positions of the S1 and J14 switches for the
first three air heaters in a system
NOTICE If the J14 switch of more than one air heater is
set to the same number, the system will not work.
NOTICE The air heater must be switched o when setting
the switches. Otherwise the settings will have no eect.

11INSTALLATION MANUAL AIR HEATER TYPE DXE
4.5.4. ON/OFF thermostat installation
To connect the air heater to an ON/OFF room thermostat,
do the following:
• Connect the two thermostat wires to terminal 6 and
7 (see figure 9 or the electrical wiring diagram in
§11.). This is a 24 V connection for the thermostat
signal.
Figure 9 - ON/OFF thermostat connection
NOTICE Never combine these connections 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.
5. Flue systems
The air heater is equipped with an internal combined
combustion air supply and a combustion gas outlet device
(wall terminal). Only in this configuration is the installation
is CE approved. Do not change this configuration. See the
installation drawings for more information.
CAUTION! Never connect another terminal to the
air heater. Always consult the manufacturer or its
representative.

12
6. Operating the air heater
6.1. Burner cycle
The air heater’s display shows the current status of the
burner cycle (figure 10).
Figure 10 - Display of the air heater
Display Status Description Time
(seconds)
0 Stand-by Waiting for heat demand. -
1 Reset Software reset. -
3 Pre-check Zero position check pressure
switch.
-
4 Pre-purge 30 seconds of pre ventilation
by the combustion fan. The
pressure switch is checked.
30
5 Pre-ignition Ignition without opening the
gas valve.
-
6 Ignition 5 seconds of ignition. The gas
valve opens.
5
7 Flame check The air heater checks if the
flame is present.
-
8 Burn > 60
9 Minimum Before the flame stops,
the burner will modulate to
minimum power.
-
10 Burner o -
11 Post purge Burner fan purges with fresh
air.
System fan cools the heat
exchanger.
60 - 120
P Anti-shuttle The heater can not generate
a heat demand during this
period.
-
F Ventilation Request to start (summer)
ventilation mode.
-
6.2. Manual operation
1. Press and hold the (+) and (-) buttons for 1 second
to enter the manual mode.
2. Press the (+) or (-) button to select the value of a
system test mode.
3. Press the OK/RESET button to save the system test
mode or press the RETURN button to cancel the
mode selection.
Display System test
mode
Description
0 Requests on The system is inactive, but accepts RT or
0-10 V input requests.
6 Requests o The system is inactive and does not accept
RT or 0-10 V input requests.
7 12-hour heat The heater burns for 12 hours at a high
power.
8 Interruptible
ventilation
Sumer ventilation is activated. It can be
interrupted by RT or 0-10 V input requests.
6.3. 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.
6.4. 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.
6.5.1. Heat exchanger
An NTC sensor is located near (or on) the heat exchanger.
This sensor monitors the heat exchanger temperature.

13INSTALLATION MANUAL AIR HEATER TYPE DXE
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.
6.6. 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 sucient
movement of combustion air through the heat exchanger.
If the pressure dierence is too low, the air heater will stop.
Error L-14 will be shown on the display.

14
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 eciency.
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 dier 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:
–The presence of gas
–The location of the manual gas valve
2. Instruct the end user about the operation of the
heater:
–Lock-out indication
–Reset
3. Instruct end user about the necessary
maintenance.
4. Leave this manual with the end user.
7.2.1. First use – thermostat
To commission the air heater via the room thermostat, do
the following:
• Put the thermostat in the highest position. The start
sequence is always the same.
The air heater will burn for the minimal firing time (see
§6.3. for more information).
7.2.2. First use - display
To commission the air heater via the display’s manual test
mode, do the following:
NOTICE The display’s manual test mode will only work for
maximum 10 minutes.
1. Press and hold the Return and (–) button for a
few seconds (figure 11). The display will alternate
between Lo and St. This means the heater will start
up in Low fire.
2. Press the (+) and (–) buttons to toggle between
Low and High fire (figure 11).
3. Press the (–) button until 0 is displayed to exit the
service. The air heater will always cool down the
heat exchanger for several minutes.
The test mode will automatically end after 10 minutes.
+
Figure 11 - Using the display

15INSTALLATION MANUAL AIR HEATER TYPE DXE
8. Combustion settings
In principle, it is not necessary to adjust the control shortly
after commissioning the air heater. When the control does
have to be adjusted after a period of use or after installing
a new heater, this must be done by a qualified person
using calibrated equipment.
DANGER! A poor adjustment can lead to overheating of
the air heater and/or production of toxic carbon monoxide.
8.1. Adjusting the burner settings
The flow of gas to the burner is controlled with a gas valve.
The valve must be set to a high and a low burner pressure.
To adjust the burner pressures, do the following:
1. Look up the correct burner pressures (see §3.2.).
2. Remove the cover from the gas valve. Use a (small)
screwdriver.
3. Switch on the air heater on high fire (see §6.1.).
4. Set the high burner pressure by turning the outside
of the adjuster screw. Use a 10 mm wrench.
5. Set the air heater to low fire.
6. Set the low burner pressure by turning the inside of
the adjuster screw. Use a screwdriver.
NOTICE Do not set the burner pressure lower than 3
mbar. This avoids problems with cross-lightning of the
burner.
NOTICE Because the high and low burner pressures
influence each other, always check both burner pressures
at least twice after any adjustment.
Inlet
Low setting High setting
High/Low
Burner
Figure 12 - Main parts of the gas valve
DANGER! Always measure the air heater’s CO
production. Too much CO usually means the gas mixture
is too rich. Adjust this if necessary with the two adjusters
(figure 12).
8.2. Converting to another gas type
CAUTION! For safety reasons, the manufacturer
recommends that the air heater is converted to another
gas type only by the manufacturer, its representative or
a qualified service technician. Contact your supplier for
more information.
To convert the air heater to another gas type, the gas
injectors on the burner unit have to be changed. A
conversion kit is available for this:
1. Switch o the air heater.
2. Shut o the gas and electricity.
3. Disconnect the ignition and ionisation cables from
the burner unit.
4. Disconnect the burner manifold from the gas valve.
This is a clamp coupling.
5. Unscrew the screws that attach the burner mani-
fold to both ends of the endplates of the burner
unit.
6. Remove the burner manifold.
7. Remove the gas injectors from the burner tube.
8. Select the correct injectors (see §12.).

16
NOTICE The injectors have a stamp that corresponds
to the diameter of the injector. For example, 130 means
1.30mm and 210 means 2.10mm.
9. Apply the sealing paste from the conversion kit on
the threads of the injectors.
CAUTION! Avoid paste from getting into the injectors.
10. Insert the new gas injectors.
11. Reattach the burner tube to the burner unit.
12. Mount the burner unit back into the air heater and
reconnect all cables.
13. Expel air from the piping and check the gas valve
and supply line for leaks.
14. Change the labels on the air heater with ones that
have the correct values for the new gas type.
15. Attach an Attention sticker that notifies users that
the air heater has been converted to another gas
type.
16. Set the burner pressures (see §8.1.).
9. Troubleshooting
If the air heater malfunctions, first check if the problem is
caused by external circumstances (e.g. no supply power).
If the problem is not caused by external circumstances,
use the tables and instructions in this chapter to fix the air
heater.
NOTICE Please remember the built in waiting times of
the air heater; the signals of the LED’s and the code on the
display. Do not react too soon.
9.1. Volatile lock outs
The table below describes the volatile lock outs that can
occur. These can only be reset by hand.
Display Error type Description Case #
L-0 Internal error Internal error 13
L-1 Ignition error Flame lasts only 5
seconds after ignition
1
No flame after ignition 2
L-2 and 3 Internal error Internal error 13
L-4 E-error E-error for more than 24
hours
12
L-8 to 12 Internal error Internal error 13
L-13 Pressure switch error Pressure switch is closed
in stand-by mode
14
L-14 Pressure switch error Pressure switch does not
close during pre-purge
11
L-15 Overheating Heat exchange sensor is
overheated
3
L-17 to 19 Internal error Internal error 13
L-20 Flame error Flame detected after
closing the gas valve
15
L-21 Flame error Flame detected before
opening the gas valve.
16
L-22 Flame error Flame failure during
burning
5
Display Error type Description Case #
L-25 Sensor error Heat exchange sensor
failure
4
L-27 to 31 Internal error Internal error 13
L-32 Sensor error Heat exchange sensor
failure
4
L-33 to 38 Internal error Internal error 13
L-43 Overheating Heat exchange sensor is
overheated too often
3
9.2. Temporary errors
The table below describes the temporary errors that can
occur. These will disappear automatically after the cause
has been resolved.
Display Error type Description Case #
E-00 to 04 Internal error Internal error 13
E-05 Overheating Heat exchange sensor is
overheated
3
E-06 to 13 Internal error Internal error 13
E-14 Flame error Flame detected when
there shouldn’t be one
16
E-15 to 20 Internal error Internal error 13
E-21 and 22 Heat exchanger
sensor error
Heat exchanger sensor
not detected
4
E-27 and 28 Heat exchanger
sensor error
Heat exchanger sensor
short-circuit
4
E-34 Reset button
error
Too many reset actions in
a short timespan
9
E-36 Overheating Heat exchange sensor is
overheated
3
E-38 and 39 Heat exchanger
sensor error
Heat exchanger sensor
not detected
4
E-47 and 48 Heat exchanger
sensor error
Heat exchange sensor
short-circuit
4
E-49 to 64 Internal error Internal error 13

17INSTALLATION MANUAL AIR HEATER TYPE DXE
Display Error type Description Case #
E-65 Voltage too low Supply voltage is too low
for over 1 minute
E-66 Voltage too high Supply voltage is too high
for over 1 minute
E-67 Pressure switch
error
Too many pressure switch
errors
11
E-69 Configuration
error
Heater configuration error 19
9.3. Warnings
The table below describes the temporary warnings that
can occur. The heater may still be working, or stops until
the cause has been resolved.
Display Error type Description Case #
A-02 Configuration
error
Heater configuration error 19
A-07 Overheating Heat exchange sensor is
almost overheated
3
9.4. Instructions
After identifying the problem, use the Case number to find
the possible cause in this paragraph.
Case 1: Flame lasts only 5 seconds after ignition.
• The flame is not detected:
–Check the ignition/ionisation cable and the
electrode. The cable should have a resistance
of 1 kΩ.
• The air heater is not earthed properly.
• The circuit board is defective.
Case 2: No flame after ignition.
• There is not enough gas pressure.
• The gas mixture is too poor:
–Adjust the gas valve (see §8.1.).
• The gas valve does not open:
–During ignition, check for a 230 V voltage on
the valve.
• Check if the ignition electrode sparks. If not:
–Check the cable and electrode and replace
them when damaged.
–Check the burner control unit and replace it
when it does not give a spark output.
Case 3: Heat exchange sensor or flue sensor is overheated.
• Check if the connectors J12 and J6 are plugged in
correctly and if the connection J12[1-4] (optional
overheating protection) is closed.
• Check if the system fan supplies enough air.
• Check the settings of the gas valve. The heater may
be overfired. If so:
–Adjust the burner pressure.
Case 4: Heat exchange sensor or flue sensor not detected,
or short circuit.
NOTICE L-25 refers to the heat exchange sensor. L-26
refers to the flue sensor, if applicable.
• The heat exchange sensor consists of two internal
sensors. The readings of these sensors may dier
too much:
–Measure the resistance of each sensor. The
resistance should be 20 KΩ at 25 °C and 25
KΩ at 20 °C.
–If the measured values dier too much,
replace the sensor.
Case 5: Too many flame failures while burning.
• The gas supply is not constant. This results in a
drop in gas supply pressure while burning and
causes the flame to extinguish.
–Check the gas supply pressure while the
heater is burning.
• The burner pressure for Low fire is too low. This
causes the flame to extinguish because it is too
small to be detected.
–Check the burner pressure at Low fire and
adjust if necessary (see §8.1).
• Recirculation of flue gas. Due to a problem with the
flue terminal the flue gas is sucked back into the air
inlet. This results into a lack of oxygen and causes
the flame to stop.
–Check the flue system and fresh air supply.
Only certified, original parts should be used.
Case 9: Too many reset actions in a short timespan.
• This error will disappear after some time or if the
main power is disconnected for a while.

18
Case 11: Insucient air passage through the heat
exchanger. Pressure switch does not close.
• Check if the combustion fan is running.
• Check if the flue system is blocked or restricted.
• Check the pressure switch and the connections.
• Check the heat exchanger for flue leakage.
Case 12: E-error for more than 24 hours.
• Switch the air heater o and on and check the error
code.
Case 13: Internal error.
• Isolate the electrical supply and reenergise. If this
does not help:
–Replace the burner control unit.
Case 14: Pressure switch is closed in stand-by mode.
• Check if the contact is stuck. If so:
–Replace the pressure switch.
• Check if there is water in the hose. If so:
–Dry the hose.
Case 15: Flame detected after closing the gas valve.
• Check if the gas valve closes too slow. If so:
–Replace the gas valve.
• Check if the ionisation electrode is wet. If so:
–Dry, clean or replace the electrode.
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 dierent
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 CO2value 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.

19INSTALLATION MANUAL AIR HEATER TYPE DXE
10.Maintenance
CAUTION! The air heater must be inspected and
cleaned once a year by a qualified installer with sucient
knowledge about the device.
CAUTION! Sucient maintenance is critical in
circumstances such as high humidity, dust, high switching
on/o 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 o 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.
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 eciency. 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.

20
9. Check the air supply and the flue discharge for dirt
and clean it.
10. Reassemble the burner unit. If necessary:
–Use new gaskets.
10.4. Extensive maintenance in
poultry sheds
WARNING! Air heaters that are used in poultry sheds
must be cleaned and inspected after every clean-out,
before disinfection and the spreading of sawdust on the
floor.
CAUTION! The heat exchanger can be cleaned with a
pressure washer. Do not use a pressure washer to clean
parts that contain electronics, such as the electric motor
or the machine cover.
1. Use compressed air or a soft brush to clean the
remaining parts from the air heater. Focus on the
following parts:
a. The inside and outside of the body.
b. The fan blades and motor.
c. The temperature sensor.
2. Remove all dust from the motor. Accumulated
dust acts as insulation and can cause the motor to
overheat.
3. Use a brush to remove any baked on dust.
4. Clean the burner unit (see §10.2.).
5. Switch on the air heater and let it heat for a while.
This burns o any remaining dust particles.
6. Stop the heating process.
7. Cover the air heater when it is fully cooled o. This
protects it from dirt or dust.
8. Make sure the air heater is electrically isolated.
9. Disinfect the poultry shed and spread the sawdust.
10. Remove the cover from the air heater. The heater is
ready to be used.
Figure 13 - Cleaning the DXE