Schwank 20S L User manual

novoSchwank
Radiant Tube Heater
20S L / 25S L / 35S L / 45S L / 55S L
Technical Manual
Technical Instructions
Operating Instructions
Legal Requirements
Assembly Instructions
Installation Instructions
Commissioning
Service Guide
0085BO0037
Version 007 novo shape L international 18/15 Technical s
p
ecification sub
j
ect to chan
g
e

Content
Version 006 novo shape L international 28/14 Technical specification subject to change
1 Introduction .............................................................................................................................3
2 Your Safety .............................................................................................................................3
Notes for your safety..................................................................................................................... 3
3 Scope of Delivery ....................................................................................................................4
4 Planning ..................................................................................................................................6
Position of suspension.................................................................................................................. 6
Positioning .................................................................................................................................... 7
Air supply / Exhaust requirements................................................................................................ 8
5Legal Requirements...........................................................................................................13
6 Operating ...........................................................................................................................14
Switching on the heater .............................................................................................................. 14
Switching off the heater .............................................................................................................. 14
Fault............................................................................................................................................ 14
Maintenance ............................................................................................................................... 14
7Technical specification.......................................................................................................15
Technical data ............................................................................................................................ 17
8Operating description.........................................................................................................18
9Assembly instructions ........................................................................................................19
10Installation instructions.......................................................................................................23
Gas-pipe system and mounting of heaters................................................................................. 23
Flue installation........................................................................................................................... 25
Electrical installation (wiring diagram) ....................................................................................... 25
11Commissioning instructions ...............................................................................................27
Adjusting nominal thermal load................................................................................................... 27
Determination of nozzle pressure............................................................................................... 29
12Service guide / Trouble shooting........................................................................................30
13Change of gas family .........................................................................................................31
Ball guards.................................................................................................................................. 32
Reflector elongation.................................................................................................................... 35
Set angled mounting tubes......................................................................................................... 35
Water protection cover................................................................................................................ 36
Gas filter - groups ....................................................................................................................... 37
15Spare parts ........................................................................................................................38
Spare parts novoSchwank 20S L – 55S L.................................................................................. 38
Spare parts burner unit novoSchwank 20S L – 55S L................................................................ 39
16EC type examination certificate.........................................................................................40
17EC declaraction of conformity ............................................................................................42
SCHWANK GmbH
Bremerhavener Str. 43 • 50735 Cologne • Germany
Postfach 62 02 49 • 50695 Cologne • Germany
Tel.: + 49 (0) 221 / 7176 0
Fax: + 49 (0) 221 / 7176 288
Internet: www.schwank.de
Schwank companies in: Austria ▪Belgium ▪Canada ▪China ▪Czech Republic ▪France ▪Germany ▪Great Britain ▪
Hungary ▪Netherlands ▪Poland ▪Romania ▪Russia ▪Slovakia ▪Ukraine ▪USA ▪Distribution in more than 40
countries worldwide

novoSchwank L
3
Version 00
7
novo shape L
international
18/15
Technical specification subject to change
1 Introduction
Thank you for choosing a SCHWANK radiant tube for
your heating-system.
Your novoSchwank L is a modern radiant tube for an
economic and comfortable heating in large rooms and
industrial buildings.
Structure and operation of the heater are according to
the requirements of the existing standards.
Please read this manual carefully before using the
heater. Pay attention to notes and warnings. The
manufacturer will not be held responsible for
damages resulting from installation errors or failure to
comply with the manufacturer’s instructions.
Please pay attention to the warnings in chapter 2
“Your Safety”.
The radiant tube novoSchwank L must be exclusively
used for the purpose it was intended. Any other use is
to be considered improper and therefore dangerous.
Its observance is imperative for the proper operation
of our devices, and is thus the condition for our
warranty.
2 Your Safety
You will find the following symbols in this manual:
Danger!
Note that you and others can be hurt.
Attention!
Note that the appliance can be damaged.
Danger!
Note that electrical shocks can be highly
dangerous. Pay attention while working at
electrical equipment.
Notes for your safety
This appliance is constructed according to the
requirements of the existing standards. Nevertheless
it’s possible that dangers for you and others result
from installation and operation errors.
To avoid this please read the following notes carefully.
General Notes
Only use the radiant tube if it’s in technical faultless
condition.
This manual is an integral and essential part of the
product and must be given to the user. Keep the
manual near the heater.
Pay attention that any person who do the following
works have red this manual:
operation
mounting
installation
putting into operation
maintenance / trouble shooting
You need an explicit permission from the
manufacturer for any kind of changes and
reconstructions.
Use original spare parts only.
Safety for the electrical equipment
Danger of electrical shocks!
Electrical shocks can be highly dangerous!
The electrical installation must be carried out by a
qualified service engineer following the existing
national and international standards.
Check the electrical equipment regularly.
Defect wires etc. must be replaced immediately.
The appliance must be cut off from power supply
while working with the electrical equipment. Make
sure that nobody can connect the appliance to the
power supply while you are working.
After-sale service
For all installation operations, start-up, gas changes,
etc. always consult a qualified service engineer.
If doubt, contact SCHWANK GmbH, phone
+49 (0) 221 / 7176 213.

novoSchwank L
4
Version 007 novo shape L international 18/15 Technical specification subject to change
Burner unit
Reflector
Tube bar
Suspension brackets Tubes
Flange packing
Reflector end plate
3 Scope of Delivery
Fig. 1: Radiant tube novoSchwank 35S L
Scope of Delivery
The radiant tube novoSchwank L consists of:
Burner-unit with gas-burner, pre mixing chamber,
ignition and control unit, firing device, gas
combination valve, air differential pressure switch,
electrical connection board, fan
Radiant tubes, flange packing
Corrosion resistant reflector with end cap and
brackets for hanging
Flue gas diverter (type A)
Accessories
Control box with on/off switch and indicator lamp
Control with temperature and time programs
Gas cock (gas connection)
Gas hose connection
Gas filter
Supply air/exhaust-flue-system
(version stainless steel)
Flue gas adapter
Support brackets for angled position (15-30°) for
novoSchwank L
Quick-hanger kits (System Gripple)
Ball protection grids (for sport halls)
Reflector elongations
Set for angled mounting
Water protection cover (stainless steel)

novoSchwank L
5
V
ersion 007
novo shape L international
18/15
Technical specification subject to chang
e
Structure of the burner unit
Fig. 2: burner unit
1. Controller
2. Air differential pressure switch
3. Fan air restrictor plate
4. Fan
5. Air baffle plate
(only 20S L / 25S L / 35S L / 45S L / 55S L)
6. Gas combination valve
7. Test nipple (connection pressure)
8. Test nipple (nozzle pressure)
9. Adjustment screw nozzle pressure
10. Adjustment screw start step valve
11. Inspection glass
12. Burner head
13. Burner nozzle
14. Ignition and ionisation electrode
15. Ignition cable
16. Ionisation cable
17. 3-pin power supply plug
18. Locking screw
19. Venturi
20. Burner baffle (only 20S L / 25S L / 35S L)
21. Gasket

novoSchwank L
6
Version 007 novo shape L international 18/15 Technical specification subject to change
4 Planning
Controlling of the room temperature
Radiant tube heating-systems must be equipped with
a temperature control.
Section heating is allowed without temperature
control.
Position of suspension
Hanging heights
Radiant tubes must be positioned so that persons in
the radiation area are not subjected to an
unreasonably high heat level. This is ensured when
the minimum hanging heights shown in the following
table are adhered to:
Tab. 1: Minimum suspension heights
Key:
A = Minimum height when hanging horizontally
B = Minimum height when hanging angled
Type a
[cm] b [cm] c [cm] d [cm]
20S L 110 20 50 15
25S L 110 20 50 15
35S L 130 20 50 15
45S L 170 25 50 25
55S L 230 35 70 35
Tab 2: Safe distances
Key:
a = Minimum radial safety distance (inside radiation area)
b = Minimum upper safety distance when hanging horizontally
c = Minimum upper safety distance when hanging angled
d = Minimum lateral distance to supply pipes outside radiation area
Distances to flammable materials in the
radiant area
Radiant tubes must be positioned so that the surface
temperature of
components with flammable materials,
flammable equipment, stored flammable materials
never rises above 85° C.
Fig. 3: Suspension heights and distances for horizontal
application
Fig. 4: Suspension heights and distances for angled
application
Direction of radiation
Radiant tubes novoSchwank L can be positioned
horizontal or at an angle (max. 30° from vertical). For
this purpose suspension steel chains and cables are
installed at the suspension brackets.
Nominal
thermal load in
kW - gross
(net)
Suspension height in m
(max. radiation 200 W/m2)
A = horizontal B = angled (30°)
16.7 (15) 3.5m 3.1m
21.1 (19) 4.0m 3.6m
32.2 (29) 4.8m 4.3m
43.3 (39) 5.5m 4.9m
54.4 (49) 6.8m 6.2m

novoSchwank L
7
V
ersion 007
novo shape L international
18/15
Technical specification subject to chang
e
Positioning
The radiant tube can be mounted with
chains (links min. 4 mm)
adjustable steel cable (Schwank accessories)
If you chose chains please use bolts with lock nuts for
fixing the chain to the suspension bracket.
The radiant tube has to be fixed by
vertical chains etc. to the roof or to
supporting devices.
Chains and steel cables have to be
fixed in vertical direction or slightly
diagonally outwards above the fixing
points of the suspension brackets to
the roof or to supporting devices.
Fixing of the suspension cables or
chains diagonally inwards to the centre
of the heater is not permitted
(see Fig 5).
Please note that the radiant tube being
in operation expands several
centimetres because of thermal
expansion. Avoid therefore inflexible
suspension.
Do not use fixing elements like open
hooks etc.
Hang the heater in balance. We recommend the use
of turnbuckles or adjustable steel cable grips for ease
of adjustment and balance.
Fixing points for chains or steel cables on the heater
are shown in Fig 10 and 11 on pages 14 and 15.
Attention!
If you do not align the burner unit
correctly the device can be damaged.
Fig. 5: Chains and steel cable mounting
Fig. 6: Slope of radiant tube heater
SCHWANK GmbH will not accept
liability for damages caused by
incorrect mounting of the burner box.
Correct mounting is the responsibility
of the installer.
wrong
wrong
correct
Correct = vertical or slightly
diagonally outwards
20S L / 25S L /35S L: x=20mm
45S L: x=30mm
55S L: x=50mm
wrong = diagonally inwards

novoSchwank L
8
Version 007 novo shape L international 18/15 Technical specification subject to change
Air supply / Exhaust requirements
Please note the max. length for combustion air supply
and exhaust flue on page 9 (Point 3, Tab. 3).
Place of Installation
Note that the room in which the heater is installed
must have an air volume of 10 m³ for each kW of heat
input / nominal thermal load.
Air supply (combustion air from inside
the room, types A3 and B23)
Installation systems with combustion air from inside
the room are only allowed in rooms without strong
pollution of the combustion air. Otherwise use system
with combustion air from outside (type C).
In halls and buildings with a normal air change by
means of joints and spaces it is not necessary to
install additional equipment to guarantee the
combustion air supply.
Air/exhaust-systems
For the radiant tube novoSchwank the following 4
air/exhaust-systems are possible:
1. Indirect flue into the room
(Type A3 without exhaust system,
combustion air from inside the room)
2. Flued with individual exhaust system,
combustion air from inside the room
(Type B23)
3. Flued with individual exhaust system,
combustion air from outside the room
(Type C)
4. Flued with flue collecting system and
central flue fan (according to EN 777, Type D)
1. Indirect flue into the room
(Type A3 without exhaust system, combustion
air from inside the room)
Exhaust air of the heaters has to be conducted from
inside the room to outside the area. Exhaust air
leaves the heater, mixes with the air inside the room
and leaves the building.
Conduction of the exhaust air may be carried out with
one of the following 3 methods:
a) Thermal ventilation: Combustion air and
exhaust air are diverted through
fixed outlets positioned on the roof or on the
walls of the building.
b) Mechanical ventilation: Combustion air
and exhaust air are diverted through
one or more fans positioned on the roof or
on the walls of the building.
c) Natural ventilation: Combustion air and
exhaust air are diverted through
outlets as a result of differences in pressure
and in temperature between the internal
and external side of a building.
For exact dimensioning and positioning
of supply air and exhaust air outlet of
the building according to EN 13410 or
G638/II please contact Schwank GmbH
Tel. +49 (0) 221 / 7176 213.


novoSchwank L
9
V
ersion 007
novo shape L international
18/15
Technical specification subject to chang
e
2. Exhaust flue with individual exhaust system
combustion air from inside the room
(Type B23)
Only use this kind of installation in rooms without
pollution of the combustion air and without relevant
pressure differences to the outside. Otherwise use
type C.
3. Exhaust flue with individual exhaust system
combustion air from outside the room
(Type C)
Combustion air and exhaust air are diverted through a
temperature stable, concentric tube with a roof or wall
outlet.
Max. length of air and exhaust flue until the concentric
tube with a roof or wall outlet is 6 m each plus two 90°
elbow.
The tube which leads the combustion air to the burner
box must be flexible and easy to remove for
maintenance. Don’t use valves and dampers in the
exhaust flue.
Tab. 3: Air/exhaust routing
Fig. 7: Air/exhaust--system, version stainless steel
4. Exhaust flue with flue collecting system and
central flue fan
(according to EN 777, Type D)
The whole system consists of max.10 radiant tubes. A
central flue fan collects the exhaust of the several
heaters in a central exhaust tube and diverts it to an
outlet.
If installing systems without individual flue fans of
several heaters it could be necessary to integrate
dampers into the connecting pipes to ensure the
operation and exhaust flue of all heaters.
See technical instruction novoSchwank
with flue collecting system

Max. length
between heater
and roof/wall
outlet
max. number
of elbows
(90°)
Ø of
air/exhaust flue
6 m 2 100 mm
novoSchwank L

novoSchwank L
10
Version 007 novo shape L international 18/15 Technical specification subject to change
Indirect flue into the room with flue gas diverter, type A3
For indirect flue into the room a
flue gas diverter must be installed
to prevent a possible blockage of
the flue gas outlet.
Fig. 8: Indirect flue into the room with flue gas diverter

novoSchwank L
11
V
ersion 007
novo shape L international
18/15
Technical specification subject to change


Flexible exhaust system novoSchwank 20S L - 55S L (wall terminal), type B23
- version stainless steel -
Stainless flexible pipe to avoid install
with sink.
Join parts of the wall terminal by
compression strong together!
All joints inside of the building tighten
securely with clamp fittings!
The wall terminal is mounted with a
small gradient to outside to prevent
intrusion of driving rain.
Please note the safety distance to
flammable materials:
- single-wall exhaust pipe: 80mm
- double-wall exhaust pipe +
wall terminal: 0mm
System certification tube heater
novoSchwank U with exhaust line system
Future ew CE 0432–CPD-219983 /
Future ew-flex CE 0432–CPD-219952 /
Future dw CE 0432-CPD-219996
(Schräder)
Fig. 9: Flexible exhaust system novoSchwank 20S L – 55S L (wall terminal), version stainless steel

novoSchwank L
12
V
ersion 007
novo shape L international
18/15
Technical specification subject to chang
e


Flexible exhaust system novoSchwank 20S L – 55S L (roof terminal), type B23
- version stainless steel -
Stainless flexible pipe to avoid install
with sink.
Join parts of the roof terminal by
compression strong together!
All joints inside of the building tighten
securely with clamp fittings!
Please note the safety distance to
flammable materials:
- single-wall exhaust pipe: 80mm
- double-wall exhaust pipe +
roof terminal: 0mm
System certification tube heater
novoSchwank U with exhaust line system
Future ew CE 0432–CPD-219983 /
Future ew-flex CE 0432–CPD-219952 /
Future dw CE 0432-CPD-219996
(Schräder)
Fig. 10: Flexible exhaust system novoSchwank 20S L – 55S L (roof terminal), version stainless steel

novoSchwank L
13
V
ersion 007
novo shape L international
18/15
Technical specification subject to change
5 Legal Requirements
We recommend that these installation guidelines
should be observed with the relevant Building
Standards Regulations of the corresponding country.
Comply with any local bylaws and the current IEE
Wiring Regulations.
Notwithstanding their limited scope, the appliance
should be installed by a competent person in
accordance with the relevant provisions of the Gas
Safety (Installation and Use) Regulations. Due
account should also be taken of any obligations
arising from the Health and Safety at Work Act. Full
compliance with all relevant regulations, including
amendments, in force at the time of installation is a
pre-requisite of our warranty.
In Germany the following rules, standards and
regulations must be observed.
HeizAnlV Heizungsanlagenverordnung
HeizBetrV Heizungsbetriebsverordnung
DIN 4701 Regeln für die Berechnung des
Wärmebedarfs von Gebäuden
DIN 4751 Sicherheitstechnische
Ausrüstung von Heizanlagen
DIN 4756 Gasfeuerungen in
Heizungsanlagen
DIN 4705 Berechnung von Schornstein-
abmessungen
DIN EN 12831 Heizungsanlagen in Gebäuden -
Verfahren zur Berechnung der
Norm-Heizlast
DIN 18160 Hausschornsteine -
Anforderungen, Planung und
Ausführung
DIN V 18599 Energetische Bewertung
von Gebäuden
DVGW G 600 TRGI 2008
Technische Regeln der
Gasinstallation
DVGW G 638-2 Heizungsanlagen mit
Dunkelstrahlern
DVGW G 660 Technische Regeln für die
mechanische Abführung der
Abgase von Feuerstätten
VDE 0722 Elektrische Vorschriften
VDE 0100 Bestimmungen für das Errichten
von Starkstromanlagen
LBO Landesbauordnung
FeuVO Feuerungsverordnung der
Länder
TAB Technische Anschluß-
bedingungen der örtlichen
Energieversorgungs-
unternehmen

novoSchwank L
14
Version 007 novo shape L international 18/15 Technical specification subject to change
6 Operating
The installation must be carried out by
a qualified engineer following the
manufacturer’s instructions.
SCHWANK GmbH will not accept
liability damages caused by incorrect
putting into operation of the heater.
Correct putting into operation is the
responsibility of the installer.
Switching on the heater
Switch on the heater. The main switch is on
the control box. After a pre-purge period of
about 25 sec. the ignition starts.
Switching off the heater
Switch off the heater.
If the radiant tube is controlled by a thermostat the
heater switches on and off automatically.
Fault
If no flame is reported during the pre-purge period
and the safety time (ca. 30 sec.) the heater repeats
the ignition process. If there is no flame after the
second ignition process the radiant tube switches off
automatically and interlocks.
Investigation and repair must be carried out by
authorized people. After clearance of the fault the
interlock can be reset.
Interlock release (Reset)
Interrupt the electric power supply for 3 sec.
Maintenance
Servicing of the heater is essential for continued
efficient operation. Servicing should be carried out
not less than once a year by a qualified service
engineer. After any servicing the heater must be
recommissioned as detailed in Chapter 12.

novoSchwank L
15
V
e
r
s
i
o
n
00
7 n
o
v
o
s
h
ape
L in
te
rn
at
i
o
n
a
l 1
8/
1
5
T
ec
hni
ca
l
spec
ifi
cat
i
o
n
subject
to
c
h
a
n
ge
7 Technical
specification
Appliance Automatic heating device, heat
transfer mainly by mean of
infrared dark radiation.
Fuels Natural gas
Propane
Minimum connection pressure in front of valve
Electrical connection
Single phase A.C. 230 V, N, PE - 50Hz (cycles)
(approx. 80 VA)
Power supply for heater and flue fan are connected
to a socket at the casing of the burner unit. To set
burner unit free of voltage it is only necessary to
remove the plug of the power supply.
Exhaust gas Flue pipe connection Ø 100 at
connection exit of tube
Gas connection 20S L - 35S L R=1/2’’ male
45S L - 55S L R=3/4’’ male
Attention!
Max. connection pressure: 60 mbar
Fig. 11: Dimensions novoSchwank 20S L / 25S L / 35S L (view from below)
Type 20S L – 55S L
Natural gas H 15mbar
Natural gas L 20mbar
Propane 40mbar
novoSchwank 35S L
(all dimensions in mm)
novoSchwank 20S L / 25S L
(all dimensions in mm)
Detail A
see page 16
Detail B
see
p
a
g
e 16

novoSchwank L
16
Version 007 novo shape L international 18/15 Technical specification subject to change
Fig. 12: Dimensions novoSchwank 45S L / 55S L (view from below)
novoSchwank 45S L
(all dimensions in mm)
Detail A
Tube overhang to last suspension
bracket 45mm for 20S L – 55S L
Detail B
Cross dimensions burner unit
20S L – 55S L A=80mm
novoSchwank 55S L
(all dimensions in mm)

novoSchwank L
17
V
ersion 007
novo shape L international
18/15
Technical specification subject to change
Technical data
Gas 20S L 25S L 35S L 45S L 55S L
Natural gas H Gas input - gross [kW] 16.7 21.1 32.2 43.3 54.4
Gas input - net [kW] 15.0 19.0 29.0 39.0 49.0
G 20 1) Gas consumption [m3/h] 1.50 1.91 2.91 3.91 4.91
Natural gas L Gas input - gross [kW] 16.7 21.1 32.2 43.3 54.4
Gas input - net [kW] 15.0 19.0 29.0 39.0 49.0
G 25 2) Gas consumption [m3/h] 1.75 2.22 3.38 4.55 5.72
Propane Gas input - gross [kW] 16.4 20.4 31.6 42.5 53,4
Gas input - net [kW] 15.0 19.0 29.0 39.0 49.0
G 31 3) Gas consumption [kg/h] 1.17 1.48 2.25 3.03 3.81
Weight [kg] 51 51 72 92 114
of air/exhaust flue [mm]
Electrical consumption [W] 91
Electrical protection
Gas connection (male thread)
Electrical supply
Ignition / Control
CE-Identification
by automatic controller system
CE - 0085 BO 0037
R½“ R3/4“
novoSchwank
Ø 100
IP 20
104
230 V/ 50 Hz ~
Spark ignition and ionisation control
1) Hi,n = 9.97 kWh/m3/ 2) Hi,n = 8.57 kWh/m3 / 3) Hi,n = 12.87 kWh//kg
Tab. 4: Technical data novoSchwank L
1) Hi,n = 9.97 kWh/m3/ 2) Hi,n = 8.57 kWh/m3 / 3) Hi,n = 12.87 kWh//kg
Tab. 5: Function parts burner unit novoSchwank L
Gas 20S L 25S L 35S L 45S L 55S L
Natural gas H Burner nozzle [mm] Ø 3.50 Ø 3.85 Ø 5.00 Ø 5.85 Ø 6.90
G 20 1
)
Fan air restrictor plate N 20S N 25S N 35S N 45S N 55S
Air baffle plate N 20S N 25S N 35S+spin N 40S L spin N 55S
Burner baffle plate Ø 50 Ø 65 Ø 65 / /
Nozzle pressure [mbar] 10 10 10 10 10
Startsteppressure[mbar] 5554 4
Natural gas L Burner nozzle [mm] Ø 3.50 Ø 3.85 Ø 5.00 Ø 5.85 Ø 6.90
G 25 2
)
Fan air restrictor plate N 20S N 25S N 35S N 45S N 55S
Air baffle plate N 20S N 25S N 35S+spin N 40S L spin N 55S
Burner baffle plate Ø 50 Ø 65 Ø 65 / /
Nozzle pressure [mbar] 15.2 15.2 15.2 15.2 15.2
Startsteppressure[mbar] 7776 6
Propane Burner nozzle [mm] Ø 1.95 Ø 2.15 Ø 2.80 Ø 3.25 Ø 3.65
G 31 3
)
Fan air restrictor plate N 20S N 25S N 35S N 45S N 55S
Air baffle plate N 20S N 25S N 35S+spin N 40S L spin N 55S
Burner baffle plate Ø 50 Ø 65 Ø 65 / /
Nozzle pressure [mbar] 37 37 37 37 37
Start step pressure [mbar] 22 22 22 22 22
novoSchwank

novoSchwank L
18
Version 007 novo shape L international 18/15 Technical specification subject to change
8 Operating description
Start-up
If heat demand exists the fan will start up. A
differential pressure builds up in the burner casing,
which is reported to the ignition unit via the differential
pressure switch.
After a pre-purge period of about 25 seconds the
automatic ignition starts (max. ignition time 5 sec.).
The twin solenoid valve with pressure regulator opens
in 2 steps the gas supply to the burner. The burner
flame is controlled by an ionisation electrode. The
ignition is switched off, if the ionisation electrode
reports a flame to the ignition and control unit during
the safety time.
If the ignition process fails the ignition unit repeats the
start-up for one time.
Operation
A superbly long laminar flame is created in the first
tube by the special burner construction. The hot flue
heats the tube surface while being fed through the
tubes by the fan. The hot tubes emit long-waved
infrared radiation which is directed to the room by the
reflector construction.
The radiant tube novoSchwank L works with a closed
combustion system. The combustion air is taken from
the room or from outside. The flue is evacuated
indirectly into the room or directly by exhaust pipe or
by a special air/exhaust pipe system.
Fault
If no flame is reported during the pre-purge period
(including 1 repetition of ignition process) the ignition
unit will switch off the radiant tube and will interlock.
Investigation and repair must be carried out by
authorized people. After clearance of the fault the
interlock can be reset.
The interlock release is carried out by interruption of
the electric power supply for 3 sec. A new start-up
begins. If no flame signal is reported to the firing
device during operation the solenoid valve shuts and
stops the gas supply immediately. A new start-up
process is repeated.
Troubleshooting: page 30
Monitoring of the combustion air supply
The combustion air supply is permanently controlled
by the differential pressure switch during the
operation.
If the differential pressure switch is not in rest position
during the start-up the operation won’t start. If the
operating contact isn’t closed during the pre-purge the
system will set in interference release.
If combustion air supply failed during operation (lack
of air) the differential pressure switch will close the
gas combination valve and stop the gas supply. A new
start-up process is repeated.


novoSchwank L
19
V
e
r
s
i
o
n
00
7 n
o
v
o
s
h
ape
L in
te
rn
at
i
o
n
a
l 1
8/
1
5
T
ec
hni
ca
l
spec
ifi
cat
i
o
n
subject
to
c
h
a
n
ge
9 Assembly
instructions
novoSchwank 20S L / 25S L
Tools you need
• hexagonal wrench (width: 10, 13
• hexagonal spinner (width: 7 and 8)
Note before mounting
Start mounting with the last tube.
Note that by height mounting the last tube put on 2
suspension brackets in the meantime.
Flanges are mounted with flange packing, jointly
fixes by 4 screws/washers/nuts M8.
Turn welding line of the tubes to the side.
The tube bars have to be fixed by nuts/3D-washers
M8 on the suspension bracket. The black bar is
clamping the last tube on the suspension bracket.
Note that the distance measure between last
suspension bracket and tube end is 45mm, see
detail A page 15.
The reflector endings will be shoved under the clip
of the suspension brackets. Reflectors will be
jointly fixed by 3x M 5 screws and self-locking nuts.
Reflectors will be fixed on both front plates by
3x M 5 screws and self-locking nuts.
Mounting of the burner unit with valve on the top.
Fig. 13: Mounting novoSchwank 20S L / 25S L
(all dimensions in mm)
Indirect flue into the room (Type A3):
Flue gas diverter code no. 126 70180
Diverter is mounted at the end of the tube
Accessory:
Flue gas adapter code no. 126 7035 0
Adapter is mounted at the end of the tube with
gasket.
Flue gas connection (Type B23, C):
version stainless steel:
Note that the flue gas flexible pipe is mounted at
the end of the tube with gasket.

Black clamping bar!!
Flue gas diverter

novoSchwank L
20
Version 007 novo shape L international 18/15 Technical specification subject to change
Assembly
novoSchwank 35S L
Tools you need
• hexagonal wrench (width: 10, 13)
• hexagonal spinner (width: 7 and 8)
hand rivet tool, drill machine,
drill 4.9mm
Note before mounting
Start mounting with the last tube.
Note that by height mounting the last tube put on 2
suspension brackets in the meantime.
Flanges are mounted with flange packing, jointly
fixes by 4 screws/washers/nuts M8.
Turn welding line of the tubes to the side.
Supporting sleeve for first flange connection:
Insert half of the supporting sleeve into first heater
tube (slot on top). Drill Ø 4.9mm hole through the
tube and sleeve and fix it by rivet. Mount the
second tube and fix the sleeve by the rivet as well.
Fix the rivets always in the opposite position lateral
to the tube. Use only stainless rivets.
The tube bars have to be fixed by nuts/3D-washers
M8 on the suspension bracket. The black bar is
clamping the last tube on the suspension bracket.
Note that the distance measure between last
suspension bracket and tube end is 45mm, see
detail A page 15.
The reflector endings will be shoved under the clip
of the suspension brackets. Reflectors will be
jointly fixed by 3x M 5 screws and self-locking nuts.
The reflector endplate is mounted at the first
reflector. Note that the distance measure between
first suspension bracket and tube end is 120mm.
Reflectors will be fixed on both front plates by
3x M 5 screws and self-locking nuts.
Mounting of the burner unit with valve on the top.
Indirect flue into the room (Type A3):
Flue gas diverter code no. 126 70180
Diverter is mounted at the end of the tube
Accessory:
Flue gas adapter code no. 126 7035 0
Adapter is mounted at the end of the tube with
gasket.
Flue gas connection (Type B23, C):
version stainless steel:
Note that the flue gas flexible pipe is mounted at
the end of the tube with gasket
Fig. 14: Mounting novoSchwank 35S L
(all dimensions in mm)

Supporting sleeve
4 rivets (stainless) Ø 4.8 mm
hole size Ø 4.9mm
Black clamping bar!! Flue gas diverter