Winterwarm Qwikshift QSG User manual

EN - v2.11 / 01-2023
Installation manual
Air heater
Type QSG

Contents
1. Introduction 4
1.1. Symbols used in this manual 4
1.2. Warranty 4
2. Safety instructions 5
2.1. Installation 5
2.2. Use 5
2.3. Maintenance & Cleaning 5
2.4. Children and vulnerable users 5
3. Technical specifications 6
3.1. Performance 6
3.2. Gas types 7
3.3. Dimensions 7
4.1. Preparation 8
4.2. Positioning the air heater 8
4.3. Gas type & connection 9
4.4. Electrical connection 9
4.5. Room thermostat 9
4.6 Heat pump 10
4.7 Condensate drain rear side hybrid heater 10
4.8 Water connections hybrid heater 11
5. Flue systems 13
5.1. Flue terminals 13
5.2. Flue length (max.) 14
5.3. Condensate discharge system 14
5.4. Installation of the flue terminal 15
6. Operating the air heater 17
6.1. Burner cycle 17
6.2. Minimum firing time 17
6.3. Delta-T-regulation 18
6.4. Summer ventilation 18
6.5. Overheating protection 18
6.6. Flue passage check 18
7. Commissioning the air heater 18
7.1. Adjusting the settings 18
7.2. Commissioning the air heater 19
8. Combustion settings 20
8.1. Adjusting the burner settings 20
8.2. Converting to another gas type 20
9. Troubleshooting 21
9.1. Volatile lock outs 21
9.2. Temporary errors 21
9.3. Warnings 22
9.4. Instructions 22
9.5. Further troubleshooting 23
10. Maintenance 24
10.1.Preparation 24
10.2.Basic maintenance 24
10.3.Maintenance of the burner unit 24
10.4.Maintenance in dusty environments 25
11. Electrical wiring diagram 26
13. Disposal and recycling 29
14. Declaration of conformity 30

4
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.

5INSTALLATION MANUAL AIR HEATER TYPE QSG
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.
Restrictions in use:
Operating pressure : max. 5 bar.
Water temperature : max. 100°C; min 4°C.
(risk of freezing!)
Environmenral temperature : max. 40°C; min 4°C.
(risk of freezing!)
WARNING! In case of freezing, the copper tubes of the
heat exchanger might get damaged, causing the heat
exchanger to leak. This is not covered by the warranty!
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.
2.2.1. Condensate discharge
CAUTION! This air heater is a condensing heater. A
condensate water discharge system must be installed
according to local regulations. Never block this discharge
system. In winter conditions, make sure the condensate
discharge does not freeze.
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 IP20B
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.

6
3. Technical specifications
3.1. Performance
Technical specification Unit QSG12 + 30
Total power kW 42,0
Maximum power heat pump kW 12,0
Maximum power booster kW 30,0
Cooling power (**) kW 8,8
Air output (max.) m3/h 3800
Type heat pumop % HPX12A
Throw m 25
Electrical connection (50 Hz) V 230
Max. electrical current inner unit per phase A 2,3
Max. electrical current inner unit one phase A 2,3
Dimensions (W x H x D) mm 795x670x922
Weight kg 110
Gas consumption G25.3 m3/h 3,6
Gas consumption G20 m3/h 3,2
Gas consumption G31 kg/h 2,4
Gas connection G” 3/4
Water connection G” 1
Water contents L 3,9
Sound pressure @ 4m dBA 35-63
Modulating EC fan Yes
Emission eciency (ηs, flow) - 94,6
Seasonal space heating eciency % 88,7
NOx emission (GCV) % 33
NOx class mg/kWh 5
Flue gas amount (max.) kg/h 48,3
Thermostat connection Modbus
Chimney flue pressure (max.) Pa 90
Flue length (max.) Pa 9

7INSTALLATION MANUAL AIR HEATER TYPE QSG
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; DE:
I2ELL; NL: I2EK
Class - B23, C13, C33
Specification Unit QSG12 + 30
Gas consumption (max.) m3/h 3.2
CO2High % 9.0
CO2Low % 8.5
O2High % 4.9
O2Low % 5.7
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 QSG12 + 30
Gas consumption (max.) kg/h 2.4
CO2High % 10.5
CO2Low % 9.7
O2High % 4.9
O2Low % 6.1
3.3. Dimensions
The dimensions of this air heater can be found in figure 1.
Figure 1 - Dimensions of the QSG 12 + 30

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 6).
• 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 6 - 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.
4.2.2. Suspension
Depending on the model of your air heater, two types of
wall support can be used:
Model(s) Wall support Art. Nr.
QSG12 + 30 Suspension adapter GA8580
All air heaters have the option to be suspended with four
threaded rods (M10). The rods can be screwed into the
threaded holes on the top of the heater (see §12.). The
threaded rods are not supplied with the air heater.

9INSTALLATION MANUAL AIR HEATER TYPE QSG
D E
QSG12 + 30 1200 12000
Figure 9 - Wall support (standard)
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 50 Hz. The control circuit is a four wire low voltage bus
communication.
Figure 10 - The air heater's connection clamps
• Connect the wires of the mains cable to the clamps
in the connection box (figure 10).
• 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
The heater can only be controlled with one of the following
thermostats:
• Smart Controller: a modbus thermostat with touch
control, suitable for hybrid air heaters.
• A building management system (BMS) with
Modbus communication.
WARNING! Never use a room thermostat to interrupt the
electric power supply to the heater.
NOTICE This air heater cannot be controlled with a simple
ON/OFF thermostat.

10
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 four 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 ..
–Minimum dimensions: 4 x Ø0.34 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 0.34 mm2
will result in a poor signal.
NOTICE A cable that is not shielded and may result
in a disturbed communication in an EMC-unfriendly
environment.
Figure 11 - Modbus connection
4.5.2 Installation of multiple appliances on one single
Smart Controller of Building Management System
One single Smart Controller of Building management
System (BMS) can conytrol multiple hybrid heaters.
Consult the user manual of the Smart Controller for further
information.
4.6 Heat pump
NOTICE Make sure that a heat pump is connected with
the right power output corresponding to the hybrid heater.
Use the same cable as specified in clause 4.4. for the
connection between the heat pump and hybrid heater.
CAUTION! Do not mix the connection to the heat pump
with the thermostat connection mentioned above. This will
damage the heat pump.
Figure 12 - Connection for heat pump in hybrid heater
The heat pump has a similar connection inside. The
connections of the wires have to correspond for a proper
communication.
Connection for hybrid heater in heat pump
4.7 Condensate drain rear side
hybrid heater
The hybrid heater has two condensate drains. The drain
at the rear side is connected to a condensate collecter
below the heat exchanger. If the lower outlet temperatures
of the heat exchanger are not set lower than 15°C, no
condensate will be formed. With lower temperatures the
change of condensate increase and a drainage hose may
be imstalled in these cases.

11INSTALLATION MANUAL AIR HEATER TYPE QSG
4.8 Water connections hybrid
heater
The water connections for supply and return (both 1“) are
marked with a blue and red label. If return and supply are
exchanged, the heat output will be decreased.
The hybrid heater has no venting for the water circuit
incorporated. These have to be installed in the water
supply and return
CAUTION! Avoid mechanical stress on the supply and
return connection. The heat exchanger may be damaged
and will start leaking because of mechanical stress.
Use a wrench to support the connections while installing
the fittings to avoid damage. Internal welds may become
loose if too much force is applied!

12
Water piping instalation diagram. For details, consult the manual of the heat pump.
A) Anti freeze valve (2x near heat pump, not included)
B) Automatic venting valve (2x on supply AND return, not included)
C) Pressure gauge (not included)
D) Expansion valve (not included)
E) Expansion vessel (not included)
F) Filter (included)

13INSTALLATION MANUAL AIR HEATER TYPE QSG
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.
QSG12 + 30 DDV 80/125 HR IA8214*
* For h > 0,5m above the roof, use art.nr. IA8217
Figure 16 - Vertical flue terminal QSG12 + 30
Model(s) Horizontal discharge
Flue terminal Art. Nr.
QSG12 + 30 CT 80/125 IA8216
Dimensions QSG12 + 30
A (mm) 1370
B (mm) 575
d Ø (mm) 80
D Ø (mm) 125
HOH (mm) 110
E (mm) 610
F (mm) 635
Figure 17 - Horizontal flue terminal QSG12 + 30

14
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
T120 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 discharge system
Condensate is discharged from the air heater/flue terminal
through a discharge pipe. The discharge pipe (Ø40 mm) is
located on the bottom of the heater (figure 18).
!
Figure 18 - The condensate discharge pipe
To install the condensate discharge system, do the
following:
• Connect the discharge pipe to the siphon that is
delivered with the air heater.
• Connect the other end of the siphon to a discharge
system with the following requirements:
–Min. Ø25 mm pipes.
–Min. downward inclination of 50 mm/m.
–Max. horizontal length of 5 m.
• Install a second siphon with an open inlet. This
ensures that the condensate can always exit the
heater.
• Fill both siphons with water. This prevents flue
gases from flowing into the room or pipework.
• Connect the discharge system to the sewer.
WARNING! Do not let the condensate drip on the roof or
roof edge of the building. This can cause dangerous ice to
form in the winter. Condensate must always be discharged
to the sewer.
CAUTION! Never close the air heater’s condensate
discharge pipe. This will cause the heater to stop working.
CAUTION! In the winter, ice can form and block the
condensate discharge pipe. Protect the condensate drain
from freezing to prevent this.
NOTICE The condensate discharge system must be

15INSTALLATION MANUAL AIR HEATER TYPE QSG
connected according to local and national regulations.
The following table describes the maximum amount of
condensate that can form per hour for each model:
Model Max. condensate rate (L/h)
HR10 - HR20 2
HR30 - HR40 3
HR50 - HR60 4
HR80 6
HR100 - HR120 8
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.
Ø80
- 130 IA8121 Ø130 - 200 GA8334 Ø80 - 130
IA8324
(5° - 25°)
IA8124
(25°
- 45°)
Ø100
- 150 IA8321 Ø100 - 150
IA8143
(25°
- 45°)
Ø130
- 200 IA8322 Ø130 - 200
GA8342
(22°
- 45°)
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.

16
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.
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.

17INSTALLATION MANUAL AIR HEATER TYPE QSG
Requirements for vertical piping:
• Maximum distance between brackets of 2 m.
• Spread the brackets evenly along the piping.
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 of the gas booster shows the
current status of the burner cycle (figure 20).
Figure 20 - 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.
-
7 Flame check The air heater checks if the
flame is present.
-
Display Status Description Time
(seconds)
8 Burn The heater fires up and starts
to modulate.
240
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.
30
P Anti-shuttle The heater can not generate
a heat demand during this
period.
18
F Ventilation Request to start (summer)
ventilation mode.
-
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.

18
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 12 oC (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.
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
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 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

19INSTALLATION MANUAL AIR HEATER TYPE QSG
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.
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 Smart Controller or
the Building Management System, do the following:
• Create a heat-request. The hybrid air heater will
activate the heat pump first. After the heat pump
has started, the water will start to circulate and the
fan of the hybrid heater will start.
• When the heat request remains active, and the
dierence between the set temperature and the
actual temperature is large enough, the gas booster
will start after a while too. The air heater will burn
for the minimal firing time (see §5.1. for more
information).The air heater will burn for the minimal
firing time (see §6.2. for more information).
7.2.2. First use gas booster - display
To commission the gas booster 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

20
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 23):
–The Oset adjuster screw for Low fire.
–The Ratio adjuster screw for High fire.
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 CO2value if the dierence is more then 0,3%:
1. Check the CO2value in High fire (Hi).
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 (Lo). The CO2value
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 (Hi) and readjust the CO2value
with the Ratio adjust screw.
8. Return to Low fire (Lo) and readjust the CO2value
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 23). 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.