Winterwarm XR User manual

XR - en - v2.0 - 12 / 2019
INSTALLATION MANUAL
AIR HEATER
TYPE XR

Content
1 Introduction 3
1.1 Symbols used in this manual 3
1.2 Warranty 3
2 Safety instructions 3
2.1 Installation 3
2.2 Use 4
2.3 Maintenance & Cleaning 4
2.4 Children and vulnerable users 4
3 Technical specifications 4
3.1 Performance 4
3.2 Gas types 5
3.3 Dimensions 6
4 Installation 7
4.1 Preparation 7
4.2 Positioning the air heater 7
4.3 Gas type & connection 9
4.4 Electrical connection 9
4.5 Room thermostat 9
5 Flue systems 12
5.1 Flue terminals 12
5.2 Flue length (max.) 13
5.3 Condensate in the flue system 13
5.4 Installation of the flue terminal 14
6 Operating the air heater 16
6.1 Burner cycle 16
6.2 Minimum firing time 16
6.3 Delta-T-regulation 16
6.4 Summer ventilation 17
6.5 Overheating protection 17
6.6 Flue passage check 17
7 Commissioning the air heater 17
7.1 Adjusting the settings 17
7.2 Commissioning the air heater 17
8 Combustion settings 18
8.1 Adjusting the burner settings 18
8.2 Converting to another gas type 19
9 Troubleshooting 19
9.1 Volatile lock outs 19
9.2 Temporary errors 20
9.3 Warnings 20
9.4 Instructions 20
9.5 Further troubleshooting 21
10 Maintenance 22
10.1 Preparation 22
10.2 Basic maintenance 22
10.3 Maintenance of the burner unit 22
11 Electrical wiring diagram 24
12 Exploded view and spare parts 25
13 Declaration of conformity 26

3
INSTRUCTION MANUAL AIR HEATER TYPE XR
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
DANGER! Indicates a dangerous situation that would lead
to death or severe injury.
WARNING! Indicates a potentially dangerous situation
that could lead to death, severe injury or serious product
damage.
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.
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! Do not use the air heater in a very dusty
environment. Dust may accumulate and cause a defect of
the heater. This is also the case for the room thermostat.
2.1.2 Temperature
CAUTION! Do not install the heater in places where the
temperature can rise above 35°C. Higher temperatures
cause the internal components to degrade much faster.
NOTICE Air heaters installed in very cold environments
may form condensate in the flue system. Make sure a
condensate discharge is installed.
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.

4
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.
2.3.1 Protection from water (IP class)
WARNING! Never use water when cleaning electrical
parts.
This air heater is not waterproof and has an IP00B
classification.
WARNING! Do not expose the air heater to rain, spray or
dripping water.
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.
3 Technical specifications
3.1 Performance
Technical specification Unit Type XR-4.1 (ERP2018)
XR10 XR20 XR30 XR40 XR50 XR60
Net nominal heat input (max.) kW 14.0 22.8 32.0 44.0 55.0 66.0
Net nominal heat input (min.) kW 9.0 14.8 20.5 26.4 33.0 39.6
Heat output (max.) kW 12.8 20.8 29.2 40.2 49.9 60.5
Heat output (min.) kW 8.3 13.8 19.1 24.4 30.8 37.0
Eciency at max. power % 91.4 91.3 91.1 91.4 90.7 91.7
Eciency at min. power % 91.7 93.0 93.1 92.4 93.3 93.4
Air output (max.) m3/h 1150 2070 2600 4370 5150 6300
Throw horizontal (max.) m 12 16 23 26 28 30
Throw vertical (max. warm) m 5 5 6 7 7 8
Gas connection G” 1/2" 1/2" 1/2" 3/4" 3/4" 3/4"
Electrical connection (50 Hz) V 230 230 230 230 230 230
Electrical power consumption
(max.)
kW 0.250 0.250 0.250 0.450 0.450 0.600
Electrical power consumption
(min.)
kW 0.250 0.250 0.250 0.450 0.450 0.600
Stand-by electrical power
consumption
kW 0.004 0.004 0.004 0.004 0.004 0.004
Electrical current A 1.1 1.1 1.1 2.0 2.0 2.6
Protection class - IP00B

5
INSTRUCTION MANUAL AIR HEATER TYPE XR
Technical specification Unit Type XR-4.1 (ERP2018)
XR10 XR20 XR30 XR40 XR50 XR60
Emission eciency (ηs, flow) % 96.1 93.3 90.6 91.7 91.2 90.8
Seasonal space heating
eciency
% 76.3 74.8 72.8 73.8 74.1 73.7
NOx emission (GCV) mg/kWh 37 36 35 43 41 42
NOx class - 5 5 5 5 5 5
Flue gas amount (max.) kg/h 21.7 35.5 51.3 70.6 88.2 105.8
Thermostat communication bus
system (low voltage)
- 2-wire low voltage communication bus
Chimney flue pressure (max.) Pa 90 90 90 120 120 120
Sound level (at 8 m) dBA 42 45 45 46 47 49
Min. suspension height
(horizontal throw)
m 1.7 1.7 1.7 1.7 1.7 1.7
Flue length m 9 9 9 9 9 9
Weight kg 36 37 38 78 80 82
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 - I2H
BE: I2E(s)
FR: I2ESI
NL: I2EK
DE: I2ELL
Class - B23, C13, C33
Specification Unit XR10 XR20 XR30 XR40 XR50 XR60
Gas consumption (max.) m3/h 1.5 2.4 3.4 4.7 5.8 7.0
CO2High % 9.0 9.0 9.0 9.1 9.1 9.0
CO2Low % 8.5 8.6 8.5 8.6 8.5 8.8
O2High % 4.9 4.9 4.9 4.9 4.9 5.1
O2Low % 5.8 5.8 5.8 5.8 5.8 5.8
3.2.2 Propane G31
Specification Unit Propane
Nominal supply pressure mbar 30-50
Supply pressure (min. - max.) mbar 25-50
Gas category - I3P
Class - B23, C13, C33
Specification Unit XR10 XR20 XR30 XR40 XR50 XR60
Gas consumption (max.) m3/h 1.1 1.8 2.5 3.5 4.4 5.3
CO2High % 11.1 10.8 10.6 10.8 10.8 10.3
CO2Low % 10.7 10.3 10.0 10.2 10.3 9.9
O2High % 4.7 4.7 4.7 4.7 4.7 5.0
O2Low % 5.7 5.7 5.7 5.7 5.7 5.7

6
3.3 Dimensions
The dimensions of this air heater can be found in figures 1 and 2.
60
490
245
285
495
575
85106
60
90
680
M10
110
Figure 1 - Dimensions of the XR10-XR30
150
650
20
70546
400
670
495
140150
106
M10
M10
105
120
Figure 2 - Dimensions of the XR40-XR60

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INSTRUCTION MANUAL AIR HEATER TYPE XR
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 3).
• 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.
Figure 3 - Minimum clearances around the air heater
4.2.1 Orientation
• When the heater is not installed horizontally, re-
adjust the CO2setting from the gas valve.
• If the air heater is installed with the air stream
vertically downwards, maintain a maximum
suspension height of 8 meters to ensure that warm
air will reach the floor.
Depending on the model of your air heater, five types of
wall support can be used:
Model(s) Wall support Art. Nr.
XR10 - 30 Standard GA8610
XR40 - 60 Standard GA8620
XR10 - 30 Turnable* GA8630
*can be rotated horizontally or forward.
Model(s) Wall support Art. Nr.
XR10 - 60 Vertical suspension kit GA845
XR10 - 30 Suspension adapter GA8690

8
Figure 4 - Wall support (standard)
Figure 5 - Wall support (turnable)
Figure 6 - Vertical suspension kit
Figure 7 - Suspension adapter
The air heater is equipped with threaded sockets to
suspend the unit (see §11).
• Use the suspension kit that is compatible with your
air heater. The suspension kit is not delivered with
the air heater. Contact your supplier.

9
INSTRUCTION MANUAL AIR HEATER TYPE XR
4.3 Gas type & connection
The unit is suited for the use of natural gas or propane gas.
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.
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 8 - The air heater's connection clamps
• Connect the wires of the mains cable to the clamps
in the connection box (figure 8).
• Completely isolate the air heater for maintenance
purposes. 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
The heater can only be controlled with one of the following
Winterwarm modulating room thermostats:
• The MTS: a modulating digital thermostat.
• The MTC: a modulating digital clock thermostat
with optimiser.
• Interface module; a specially designed interface
module for BMS systems. Contact your supplier for
more information.
• ON/OFF thermostat: a simple on/o thermostat.
WARNING! Never use a room thermostat to interrupt the
electric power supply to the heater.
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.

10
• 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 Modulating room thermostat installation
To connect the air heater to an MTS or MTC thermostat, do
the following:
1. Connect the two control wires to terminals 4 and
5 (see figure 9 or the electrical wiring diagram in
§11).
a. Set the S1 and J14 switches on the control
unit as follows (figure 10/11):
b. Set S1 to 1.
c. Set J14 to 1.
NOTICE The air heater must be switched o when setting
the switches. Otherwise the settings will have no eect.
Figure 9 - Modulating thermostat connection
1 2 3 4 5 6 7 8
ON
1 0
S1 J14
Figure 10 - Positions of the S1 and J14 switches
Figure 11 - 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 12):
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.

11
INSTRUCTION MANUAL AIR HEATER TYPE XR
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 12 - 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 13):
a. Set the S1 switch of the first air heater to 1.
b. Set the S1 switch of the other air heaters to 2.
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 13 - 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.
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 14 or the electrical wiring diagram in
§11). This is a 24 V connection for the thermostat
signal.
Figure 14 - 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.

12
5 Flue systems
To ensure safe and proper use, this air heater must be
connected to a flue system. This flue system must be
installed according to this manual as well as national and
local regulations. A flue system consists of a flue terminal,
piping and an optional condensate discharge system.
CAUTION! Do not use flue terminals for condensing
appliances on non-condensing heaters. This can lead to
water inside the flue system.
NOTICE Only use the prescribed flue material for the
roof terminal, wall terminal and for the piping between
the heater and the terminal. This is the only way the
installation will be approved.
NOTICE Local regulations can require the flue terminal to
be placed at least 0,6 m above roof level.
NOTICE Local regulations can require a minimum
distance between the flue terminal and air ventilation
openings on the building.
5.1 Flue terminals
The following flue terminals are compatible with this air
heater:
Model(s) Vertical discharge
Flue terminal Art. Nr.
XR10 until XR30 DDV 80/125 IA8202*
XR10 until XR30 - -
XR40 until XR60 DDV100/150 IA8101**
* For h > 0,5m above the roof, use art.nr. IA8218
** For h > 0,5m above the roof, use art.nr. IA8107
Model(s) Horizontal discharge
Flue terminal Art. Nr.
XR10 until XR30 CT 80/125 IA8113
XR10 until XR30 2-pipe terminal GA8202
XR40 until XR60 CT100/150 IA8112
Figure 15 - Vertical flue terminal XR
Figure 16 - Horizontal flue terminal XR

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INSTRUCTION MANUAL AIR HEATER TYPE XR
5.1.1 Flue material
Only use CE marked flue material from the manufacturers
Muelink & Grol (M&G) and Burgerhout.
Use type Alu-fix with a minimum temperature class of
T250 P1.
Use flue pipes with the same diameter as the flue spigots
on the heater.
Contact your supplier to purchase these flue materials.
NOTICE Dierent manufacturers use dierent
connections systems for flue pipes. Do not combine
systems from dierent manufacturers.
5.2 Flue length (max.)
The maximum straight length between the air heater and
its flue terminal for both orientations is:
• Horizontal & vertical: 9 meters.
Bends that are used in the connection between an air
heater and the flue terminal cause a decrease in pressure:
• Using a 90° bend decreases the maximum length
of the connection by 2 meters.
• Using a 45° bend decreases the maximum length
of the connection by 1 meter.
For further information regarding the flue system, please
contact your supplier.
5.3 Condensate in the flue system
Condensate can form in the flue system when the air
heater is heating up. This condensate will evaporate if the
heater is operating for a longer period of time. The forming
of condensate depends on the following factors:
5.3.1 Air heater type
Condensate is especially likely to form in the smaller
heaters (< 25 kW).
Condensate will most likely not form in the larger heaters
(> 25 kW).
5.3.2 Air heater location
When an air heater burns frequently and is placed in
a normally heated room (temperature above 15 °C),
condensate is unlikely to form.
Air heaters placed in a room that needs to be just above 5
degrees will only burn for short periods at the time. Formed
condensate will not evaporate in these short burning
periods. The condensate will accumulate and eventually
result in pressure switch errors. To prevent this:
• Add a T-piece (figure 17).
or
• Add a condensate drain (figure 17).
5.3.3 Flue pipe length
When the flue pipe is long and runs through a cold space,
condensate can form. If the straight length of the flue pipe
is longer than 4 meters, the condensate will not evaporate
and accumulate in the heater. In this case. To prevent this:
• Insulate the flue pipes.
or
• Place a condensate trap (figure 18).
T-piece (6) Condensate
trap (7)
Condensate
drain
Ø80 art. IA8223 IA8225 IA8286
Ø100 art. IA8176 IA8188 IA8288
6
7
Figure 17- A T-piece (6) and condensate trap (7)

14
Figure 18 - Condensate drain
5.4 Installation of the flue terminal
There are flue terminals available for installation through a
roof or through a wall.
NOTICE The flue terminal must be installed according to
local and national regulations.
NOTICE Do not combine components or materials from
dierent manufacturers.
5.4.1 Installation - Roof terminal
To install the flue terminal in the roof, do the following:
5.4.1.1 Preparation
1. Check all components for possible damage.
2. Determine the roofing type:
Flat roof flashing Synthetic tile
Universal
pitched roof
flashing.
3. Determine where the flue terminal will be
positioned.
5.4.1.2 Installation
1. Create a hole from the outside of the roof.
CAUTION! Make sure no debris or dust gets into the air
heater.
2. Install the weather collar.
3. Carefully insert the flue terminal from the outside.
CAUTION! Do not rotate the cap.
4. Put the flue terminal into a vertical position. Use a
level.
5. OPTIONAL - If desired, fit cover plates. These are
supplied separately.
6. Place the supplied wall clamp around the flue
terminal and fit it to the roof construction. Do not
tighten the clamp yet.
7. Connect the gasket and the twin-tube connection.
Make sure that the gasket is not damaged.
NOTICE Make sure the flue tube and the air inlet tube are
not mixed up. The flue tube should be in the centre of the
flue terminal.
8. Tighten the roof wall clamp.
9. Check if all steps have been carried out correctly.
5.4.2 Installation - Wall terminal
To install the flue terminal in a wall, do the following:
5.4.2.1 Preparation
1. Check all components for possible damage.
2. Determine where the flue terminal will be
positioned.

15
INSTRUCTION MANUAL AIR HEATER TYPE XR
5.4.2.2 Installation
1. Create a hole through the wall.
CAUTION! Make sure no debris or dust gets into the air
heater.
2. Carefully insert the flue terminal from the outside.
CAUTION! Do not rotate the cap.
3. Put the flue terminal in a horizontal position. Use a
level.
4. Mark the holes on the wall.
5. Drill the holes.
6. Insert screws to fix the terminal in place.
7. Seal the edges of the flue terminal with kit.
8. Fix the shield on the inside of the wall.
CAUTION! Make sure that the gasket is not damaged.
9. Connect the gasket and the twin-tube connection.
NOTICE Make sure the flue tube and the air inlet tube are
not mixed up. The flue tube should be in the centre of the
flue terminal.
10. Check if all steps have been carried out correctly.
5.4.3 Installation of the flue system parts
This chapter gives the instructions for installing an ALU
FIX flue system.
5.4.3.1 Requirements
The installation must follow these requirements:
• Minimum distance between the flue system and
combustible materials of 40 mm.
• Minimum depth of female sockets of 40 mm.
• Minimum slope of horizontal piping of 50 mm/m
(3°). This allows condensate to flow to the heater.
NOTICE Use brackets that match the flue system.
Dierent manufacturers use dierent connection systems
for flue pipes. It is not allowed to combine systems from
dierent manufacturers.
5.4.3.2 Elements system ALU FIX thick wall
An ALU FIX flue system is created with four elements
(figure 19).
Figure 19 - The elements of a flue system
5.4.3.3 Seals
The connection between the dierent flue elements must
be made airtight and waterproof with silicon seals.
CAUTION! If the flue elements have been cut, make sure
to clean and chamfer the edges. Sharp edges will damage
the seals.
CAUTION! Do not drill or screw in the flue elements.
CAUTION! Do not try to seal the connections with kit,
foam or tape.
CAUTION! Do not use grease, vaseline or oil to lubricate
the installation.
CAUTION! Only use the lubricant allowed by the
manufacturer to lubricate the connections. A maximum
soap concentration of 1% is allowed.
NOTICE Follow the instructions from the manufacturer if
the connections need to be fixed.
5.4.3.4 Installation
Take note of the following rules and requirements when
installing a flue system:
CAUTION! Do not apply mechanical force on the parts
during installation.
Requirements for horizontal and non-vertical piping:
• Maximum distance between brackets of 1 m.
• On tensile joints; maximum distance between
brackets of 2 m.
Follow the manufacturer’s instructions.
• Spread the brackets evenly along the piping.
Requirements for vertical piping:
• Maximum distance between brackets of 2 m.
• Spread the brackets evenly along the piping.

16
Always place a bracket on or near a bend or elbow piece,
except if the flue pipes before and after the elbow piece
are shorter than 0,25 m. In this case, fix the second
element after the elbow with a bracket.
Every flue discharge system needs to be secured with at
least one bracket. The first bracket needs to be within the
first 0,5 m of the air heater.
When installing a flue system inside a shaft, do the
following:
1. Check the components for possible damage or
blockage.
2. Check that the pipe is at the right slope (see
Requirements).
3. Mark the flue pipes and fresh air pipes to avoid
mixing them up.
4. Make sure that the pipes extend for at least 50 mm
when passing through a wall or other obstacle.
5. Fix the last element before entering the shaft in
place. If the last element is an elbow piece, the
next element must also be fixed in place.
6. Check if ventilation openings and inspection
hatches comply with national and local regulations.
6 Operating the air heater
6.1 Burner cycle
The air heater’s display shows the current status of the
burner cycle (figure 20).
Figure 20 - Display of the air heater
Display Status Description
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.
5 Pre-ignition Ignition without opening the gas valve.
6 Ignition 5 seconds of ignition. The gas valve opens.
7 Flame check The air heater checks if the flame is present.
8 Burn The heater fires up and starts to modulate.
9 Minimum Before the flame stops, the burner will
modulate to minimum power.
10 Burner o The gas valve closes. The flame stops.
11 Post purge Burner fan purges with fresh air.
System fan cools the heat exchanger.
6.2 Minimum firing time
The heater will always fire for a minimum of 4 minutes,
even if the heat demand stops. This is to avoid a large
amount of start and stops and to prevent condensate from
accumulating in the flue system.
NOTICE The heater will try to ignite 2 times before it stops
and gives an error.
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-
dierence between the sensor on the heater (the delta-T
NTC sensor) and the sensor in the thermostat is bigger
than 8oC (standard factory setting). This procedure
ensures an even distribution of temperature throughout
the building, thus acting as a fully automatic de-
stratification fan.
6.3.1 Switch o delta-T-regulation
Delta-T regulation can be switched o 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
o when the delta-T sensor (sensor terminal J6) is
disconnected.

17
INSTRUCTION MANUAL AIR HEATER TYPE XR
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.
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
The flue sensor (NTC) is an optional component that 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).
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
(only during the pre-purge phase). If the pressure
dierence is too low, the air heater will not start. 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 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 CO2value if the CO2reading diers more
than 0,3% 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.

18
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
2. Instruct the end user about the operation of the
heater:
a. Lock-out indication
b. 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
§6.2 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 21). 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 21).
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 21 - Using the display
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.
This valve must be set to the high and a low power settings
of the heater. When adjusting, the CO2or O2in flue gas has
to be monitored with a calibrated analyser.
The gas valve is adjusted with two screws (figure 22):
–The Oset adjuster screw for Low fire.
–The Ratio adjuster screw for High fire.

19INSTRUCTION MANUAL AIR HEATER TYPE XR
Figure 22 - Main parts of the gas valve
The air heater must first be commissioned at High fire.
NOTICE If the air heater does not ignite while sparking,
close the air-openings of the gas-air mixer during ignition.
Use your forefinger. The gas mixture will become richer
and will ignite more easily.
Look for the correct CO2value for the air heater in §3.2.
Adjust the CO2 value if the dierence is more then 0,3%:
1. Check the CO2value in High fire (mode 4).
2. Turn the Ratio adjuster screw to the right to de-
crease the CO2 value.
3. Turn the Ratio adjuster screw to the left to increase
the CO2value.
4. Check the CO2value in Low fire (mode 2). The CO2
value in Low fire should be lower than in High fire.
5. Turn the Oset adjuster screw to the left to de-
crease the CO2value.
6. Turn the Oset adjust screw to the right to increase
the CO2value.
7. Return to High fire (mode 4) and readjust the CO2
value with the Ratio adjust screw.
8. Return to Low fire (mode 2) and readjust the CO2
value with the Oset adjuster screw.
9. Repeat the steps above until both CO2values are
ok.
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 22). The concentration of CO should always be
below 100 ppm.
8.2 Converting to another gas type
CAUTION! The air heater’s gas type may only be
converted by the manufacturer or its representative.
Contact your supplier for more information.
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-5 Burner fan error Burner fan does not work 6
L-6 and 7 Burner fan error Burner fan rotates at the
wrong speed
7
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-16 Flue temperature
error
Flue sensor is overheated 3
L-17 to 19 Internal error Internal error 13

20
Display Error type Description Case #
L-20 Flame error Flame detected after
closing the gas valve
15
L-21 Flame error Flame detected after
closing the gas valve
16
L-22 Flame error Flame failure during
burning
5
L-25 Sensor error Heat exchange sensor
failure
4
L-26 Sensor error Flue 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-42 Flue temperature
error
Too many flue temperature
errors
3
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
Flame detected when there
shouldn’t be one
13
E-14 Flame error 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-23 and 24 Flue sensor error Flue sensor not detected 4
E-27 and 28 Heat exchanger
sensor error
Heat exchanger sensor
short-circuit
4
E-30 and 31 Flue sensor error Flue 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
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-68 Flue temperature
error
Flue sensor is overheated 3
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
A-08 Overheating Flue 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.