Schwank 20S L, 25S L, 45S L, 55S L, 35S L Technical 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

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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

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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.

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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)

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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

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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

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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

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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.



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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

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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

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



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

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



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

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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

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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.

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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 page 16

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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)

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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“

R

3

/4“

novoSchwank

Ø 100

IP 20

104

230 V/ 50 Hz ~

Spark ignition and ionisation control

1) H

i,n

= 9.97 kWh/m3 / 2) H

i,n

= 8.57 kWh/m3 / 3) H

i,n

= 12.87 kWh//kg

Tab. 4: Technical data novoSchwank L

1) H

i,n

= 9.97 kWh/m3 / 2) H

i,n

= 8.57 kWh/m3 / 3) H

i,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

Start step pressure [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

Start step pressure [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

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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.



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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

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Assembly

novoSchwank 45S 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 210mm.

 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. 15: Mounting novoSchwank 45S L

(all dimensions in mm)



Black clamping bar!!

Supporting sleeve
4 rivets (stainless) Ø 4.8 mm

hole size Ø 4.9mm

Flue gas diverter

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Version 007 novo shape L international 18/15 Technical specification subject to change

Assembly

novoSchwank 55S 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 4.9mm Ø 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 210mm.

 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. 16: Mounting novoSchwank 55S 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

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Technical specification subject to change

10 Installation
instructions

Danger of fire and explosion!
Unprofessional handling with gas
pipes, gas connections and supplied
devices can produce gas leaks. It is
highly dangerous if gas is ignited!
Working with gas pipes and supplied
appliances is only allowed by approved
installers.

Mount the flexible connection so that it
can compensate the longitudinal
expansion of the tube.

Only use flexible connections for the
radiant tube regarding:

• gas

• electricity and

• air (if necessary)

Fig. 17: Longitudinal expansion

Gas-pipe system and mounting of
heaters

Assembling of gas pipes to the appliance, supply and
the mounting of the appliance is only allowed by a
competent person who is registered, holding a current
certificate of competence and in accordance with the
relevant provisions of the gas safety (installation and
use) regulations.

Additional installation notices of national or local
institutions must be observed. The pipe must be
dimensioned in that way that the minimum connection
pressure in front of the gas combination valve of the

individual devices are available at the nominal thermal
load of the entire system, according to table 6.

Please consider the pressure drop of the upstream
mounted gas connection and gas filter. For the
detailed pressure drop value of the Schwank gas­pipe-systems see table 7.

Minimum connection pressures in front of valve

Type nozzle start step

pressure pressure

[mbar] [mbar] [mbar]

Natural

g

as H*

20S L - 55S L

15 10 4 - 5

Natural

g

as L*

20S L - 55S L

20 15.2 6 - 7

Propane

20S L - 55S L

40 37 22

* Natural gas H: Hi,n: 9.97 kWh/m3 Natural gas L: Hi,n: 8.57 kW h/m

3

novoSchwank shape L

min.

connection

pressure

Tab. 6: min. connection pressures in front of gas

combination valve

Pressure drop Schwank flexible gas-pipe-systems

novoSchwank shape L

Type Gas pipe

system

Pressure drop

[mbar]

Natural

gas H

20S L – 35S L

1/2" / L=800mm 2

45S L – 55S L

3/4" / L=800mm 2

Natural

gas L

20S L – 35S L

1/2" / L=800mm 2

45S L – 55S L

3/4" / L=800mm 2.5

Propane

20S L – 35S L

1/2" / L=800mm 1

45S L – 55S L

3/4" / L=800mm 1

Tab. 7: Pressure drop Schwank flexible gas-pipe-systems

The max. connection pressure is 60mbar!

In case of contaminated gas pipes
and generally at gas pipes of welded
black steel have to be mounted gas
filter-groups directly in front of the
heater (see page 37).

novoSchwank L

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Version 007 novo shape L international 18/15 Technical specification subject to change

Note the following points while installing the
gas-pipe-system:

 Use only gas lines as per national standards.

 Never hang heaters on the gas pipes.

 Mount a manual gas cock upstream of every

radiant tube.

 Close all gas cocks before carrying out the leak

test and disconnect the connection between the
gas cock and the burner to avoid damages to
the gas regulator and gas combination valve.

 Clean gas pipes before the installation of the

heater. Reconnection after pressure control and
expansion.

Please observe the national standards.

Connect the heater with an approve
flexible hose

 Use the following hose length:

 Mount only a flexible hose with 90° bend or with

2 x 90° elbow with 180° bend according to
Fig. 18, 19 and 20.

 Keep the specified installation dimensions.

 Wrong mounting of flexible hoses shown in

Fig. 21 (sketches

 to )

Fig. 18: Stand connection 90° bend

Fig. 19: lateral connection 90° bend

Fig. 20: Alternative flexible hose 180° -bend with 2 x 90° elbow

Fig. 21: Wrong mounting of flexible hoses

20S L – 35S L R ½“ length 800mm
45S L – 55S L R ¾“ length 800mm

430 mm
(+/- 10%)

430 mm

(+/- 10%)

430 mm

(+

/

- 10%)

430 mm
(+/- 10%)







a = 320 mm +/- 10%

h = 150 mm
h: allowable height

displacement for mounting

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Flue installation

The flue system is available as accessories to the
radiant tube novoSchwank. The flue system is
connected at the end of the radiant tube. Note to

information in Chapter 4 „Planning“.

Electrical installation
(wiring diagram)

Danger of electric shock!
Electric shocks are dangerous!
Working at the electrical equipment of
the appliance is only allowed by
competent persons observing the
current IEE regulations.

Isolate the electrical supply while
working at the electrical equipment of
the appliance.

The gas supply and electrical cable
must be situated on the outside of the
area of the heater radiation or it’s
combustion products. Only use heat­resistant cables near the tubes.

Electrical connection

 Route the connection cable (power supply) to the

four-pin plug and connect cables.

 Put the four-pin plug into the socket at the burner

casing.

 Connect the plug of the fan into the corresponding

socket at the burner casing.

Pay attention of correct polarity! If
polarity is incorrect the firing device will
not register ionisation signal!

You find the four-pin socket for the
electrical supply in the burner unit.







novoSchwank L

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Version 007 novo shape L international 18/15 Technical specification subject to change

Fig. 22: Connecting diagram novoSchwank L

Fig. 23: Wiring diagram burner unit novoSchwank L

Burner
unit

Control Box
Thermocontrol Plus M /
unoSchwank

L

N

PE

L

N

PE

Gas valve VK 4105C

Electrical supply 1~230Volt, 50Hz, N, PE

2

PE

single-stage operation

3

P

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11 Commissioning
instructions

Before putting into operation

A qualified and permitted service engineer must carry
out this operation. The correct operation and fixing of
the heater is prerequisite for our liability. Checking gas
lines and flue system is not included in the fixing.

Check function of the following equipment:

 Exhaust flue

 Combustion air supply

 Control unit

 Safety equipment

 Safety of electrical circuit

Pay attention after putting into
operation! Vaporization of remaining
grease of metal units may cause greasy
mist. This kind of mist disperses after
approx. 30 minutes. During this time the
room has to be ventilated.

Adjusting nominal thermal load

Attention!
The pressure control unit is pre­adjusted on natural gas. Do not put the
appliance into operation without
controlling.

Adjusting the nozzle pressure

1. Open first the gas cock which is at the end of the
flexible gas hose (Fig. 24, page 28).

2. Open the test nipple connection pressure.
Connect the pressure measuring instrument to the
test nipple and determine the connection pressure.

Close the test nipple after the measurement!

3. Open the test nipple nozzle pressure.
Connect the pressure measuring instrument to the
test nipple and determine the nozzle pressure.

4. Put the radiant tube into operation.

5. Turn the adjusting screw on the pressure regulator
slowly in the “+” or “-” -direction while continuously
watching the pressure measuring instrument. Stop
turning as soon as the required nozzle pressure is
reached. The required nozzle pressure for natural
gas H (Wo =14.85 kWh/m

3

) and natural gas L

(Wo =12.15 kWh/m

3

) is shown in table 5 page 17.
For natural gas with other Wo-Index (information
from local gas company) you have to determine the
required nozzle pressure from the diagram on
page 29.

6. Remove the protection cap A (see Fig. 25, page 28).

7. Put the radiant tube into operation.

8. Turn the adjusting screw B (see Fig. 25, page 28)

on the pressure regulator slowly in the “+” or “-” ­direction while continuously watching the pressure
measuring instrument. Stop turning as soon as the
required nozzle pressure is reached.

9. Put the protection cap A on the valve after the

adjusting.

10. Close the test nipple after the measurement
and check if the test nipple is gas-tight.



novoSchwank L

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Version 007 novo shape L international 18/15 Technical specification subject to change

Checking adjustment

1. Turn the adjustment screw slightly to “-“

-direction. Orifice pressure must drop immediately.
If this does not happen, you must readjust the
orifice pressure until the point is reached at which
a decrease or increase in the nozzle pressure is
noticeable on the measuring instrument when the
adjustment screw is turned slightly to “+” or “-“
direction.

2. Close test nipple after the measurement!

3. Remove the measuring instrument and check if the
test nipple is gastight.

Fig. 24:

Gas cock with integrated TSD

Fig. 25: Adjusting screw nozzle pressure gas combination valve

A

B

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Determination of nozzle pressure

Example of determination of nozzle pressure

The diagram shows an example of a determination of
nozzle pressure with a Wobbe-Index of 14.85kWh/m

3

.

 Mark the Wo value of the used gas at the x-axis.
 Draw a vertical line until you reach the curve in the

diagram.

 Draw a horizontal line until you reach the y-axis.

Now you can read the required nozzle pressure at the
y-axis (10.0mbar in this example).

novoSchwank L

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Version 007 novo shape L international 18/15 Technical specification subject to change

12 Service guide /

Trouble shooting

Maintenance and annual check

A regular maintenance is assumption for a faultless
operation of the appliance.

According to the national Standard Regulations heating­systems with radiant tubes must be checked minimum
once a year.

Maintenance and trouble shooting is only allowed by
persons who are competent and instructed in radiant
tubes.

Before the beginning on works on the
heater the gas cock is to be closed.

Maintenance must include the following checks:

 Check the surface of radiant tubes

 Check the pollution and sooting of tubes

 clean (if necessary)

 Check tightness of the tube system including

connection to the burner unit

 Check the air/flue-system  clean (if necessary)

 Check the gas connection  Leakage-test

 Check the connection pressure, nozzle pressure and

start step

 Check gas filter in case of reduced line pressure, in

case of pollution change filter set

 Check the safety functions of the ignition- and

ionisation-controls

 Check the valve functions

 Check the function of the pressure switch

 Check the electrical connections

 Check the slope of the tubes (3 mm/m in direction of

the turn around box connection)

 Check the flexible gas hose and electrical

connection to the burner unit

 Check the room temperature control

 Check the distances to any flammable materials

 Check the air/flue ventilation of the room

 Remove condensation water in the tube

 Check correct connection of the reflectors

 Check if the fan impeller runs correctly and is free of

any damages

 Check the tight fit of the fan venturi

 Check connection and tightness of the fan to the

burner unit

Works which are necessary must be done immediately.
Defect parts must be changed directly.

Pressure switches, pressure regulators, valves and
safety- and ignition devices can only be maintained by
the manufacturer or authorized people.

Trouble shooting

In case of doubt, please contact SCHWANK GmbH,
phone +49 (0) 221 / 7176 213.

fault reason

burner doesn't start

• no gas (check pre- and nozzle
pressure)

• fault in electrical supply

• thermostat "OFF"

• connection of ignition- and ionisation
electrode is wrong

• differential pressure switch is defect or
out of order (contact must be open)

• flame signal is pretended by electrical
defect of control

• underpressure is not sufficient

control goes in fault
position during the
safety time

• no flame (no ignition, valve doesn't
open, no gas)

• none or poor flame signal (flame
doesn't stick, bad insulation of the
flame detector, no contact between
burner and earth connection)

• wrong polarity

control goes in • flame is off

fault position during
the operation

• contact of differential pressure switch
doesn't open

• flame signal is to poor

control goes in fault
position during the
pressure time

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13 Change of gas family

Fig. 26: Change of gas family

 Burner baffle (only 20S L / 25S L / 35S L)
 Burner cup
 Burner nozzle
 Air baffle plate

(only 20S L / 25S L / 35S L / 45S L / 55S L)

 Fan air restrictor

Instruction to change the gas family

1. Change the burner nozzle

2. Change the burner ceramic tile or the whole burner
cup only for 55S L

3. Adjust the new nozzle pressure
(see tab. 5, page 17)

4. Adjust the new start step pressure
(see tab. 5, page 17)

5. Stick on the new rating label

novoSchwank L

32

Version 007 novo shape L international 18/15 Technical specification subject to change

14 Accessories

Ball guards

Ball protection grids acc.18032-3 for using heaters in
sport halls (grid 40x40mm).

Delivery scope

Mounting set complete for each type of heater:

Tab. 8: Overview delivery scope ball guards

Assembling

(Description for heater novoSchwank 25S L,
other types similar)

1. Mounting heater as usually acc. manual
(see chapter 9, page 19-22).

2. Fix end bracket at the inner holes of last
suspension bracket (flue gas outlet side),
(Fig. 28, page 34)

3. Fix two angled brackets at each suspension
bracket (screws M8 x 60, nuts) (Fig. 29, page 34)
Screw on angled brackets at the inner holes of
tube hangers.

4. Holding bracket put loose on the first reflector (view
from burner unit) and screw together with two
angled brackets (screws M8 x 60, nuts), holding
bracket remain axially movable (Fig. 30, page 34).

5. Assembling segments ball protection grids starts

on last tube hanger. Put first segment ball
protection grid L=2963 mm from below on end

bracket and angled brackets of the next
suspension bracket – Put clamps on stud bolts M8
and mount with self-locking nuts
Mount clamp loose on one stud bolt of angled
bracket for further assembling next protection grid
(Fig. 31, page 34).

6. Put next segment ball protection grid L= 1843mm

from below on angled brackets and mount clamp

with self-locking nuts M8, clamp and angled
bracket connect two segments ball protection grid
to each other.
Mount clamp loose on one stud bolt of angled
bracket for further assembling next protection grid.

7. Put next segment ball protection grid
L= 1843mm from below on angled brackets and

mount clamps with self-locking nuts M8
Last segment ball protection grid L= 1843mm

protects the burner unit at the bottom.

8. After finish assembling of all ball protection grids fix
holding bracket with 3x self-tapping screws on the
reflector.

9. Push on protection grid burner top from behind
over ball protection grid and burner up to the

suspension bracket. Note that the lower short
bending is on the left side in view from behind.
Fix burner protection grid burner top with supplied
cable straps or similar at bottom protection grid.

10. Protection grid burner top has to be cut holes
depends on installation on-site for flue system and
may be gas line. Connect flue system pipes and
gas line.

novoSchwank shape L 20S L 25S L 35S L 45S L 55S L

Ball protection grid L=1443mm 1x

Ball protection grid L=1843mm 2x 2x 2x 2x 2x

Ball protection grid L=2963mm 1x 1x 2x 3x 3x

Protection grid burner top 1x 1x 1x 1x 1x

Front protection cover burner 1x 1x 1x 1x 1x

Protection grid burner end side 1x 1x 1x 1x 1x

End bracket with stud bolts M8 1x 1x 1x 1x 1x

Holding bracket 1x 1x 1x 1x 1x

Angled bracket with stud bolt M8 6x 6x 8x 10x 12x

Clamp 8x 8x 10x 12x 14x

Set fixing material 1x 1x 1x 1x 1x

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NOTE: Select the cut outs large enough to
compensate the thermal length expansion of
the heater!

11. Insert front protection cover burner between front
cover plate reflector and burner unit and fix it with
supplied cable straps or similar on protection grid
burner top (Fig. 32, page 34).

12. Protection grid burner end side has to be cut hole
depends on installation on-site for gas line.
Fix with supplied cable straps or similar on
protection grid burner top.

Please note the required number and
length of segments ball protection grids
for each type of heater. Compare this to
the tabular and graphical overview.

Fig. 27: Overview of ball guard

novoSchwank L

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Technical specification subject to change

Fig. 28: Fixed end bracket on last suspension bracket

Fig. 29: Fixed angled bracket on suspension bracket

Fig. 30: Holding bracket novoSchwank L

Fig. 31: Loose mounted clamp

Fig. 32: Fixing front protection cover burner on protection

grid burner top

novoSchwank L

35

Version 007 novo shape L international 18/15 Technical specification subject to change

Reflector elongation

Vertical elongation of reflectors b=415mm for thermal
protection. The numbers reflector elongation (single
sheets) is depend on required protection (one side both
side, protection length) and the power of the radiant
heater.

Delivery scope

Reflector elongation consists of:

 numbers of sheet reflector elongation

 mounting material

Assembling

1. Assembling and mounting tubes with reflectors

complete acc. manual (see chapter 9, page 19-22).

2. Fix screws with distance sleeve and mounting

angles A at hangers as required.

3. Put reflector elongation sheet B on mounting angle

A. Screw both parts together with the added clip C

and screw/nut M8 and lock a nut to ensure the
reflector elongation sheets.

4. Fix reflector elongation sheets to another with

screw/nut M8.

At heaters with axial reflector elongation
the last suspension bracket on the
burner side must be mounted at the
junction point reflector/reflector end
plate.

Fig. 33: Assembling order reflector elongation

Set angled mounting tubes

Bracket to ensure form and position of reflectors when
the heater is mounted angled (>15°). Bracket to mount
at each junction point reflector/reflector, not at reflector
end caps.

Delivery scope

Mounting set consist of:

 numbers of brackets

 mounting material

Assembling

1. Assembling and mounting of tubes complete
(without reflectors) acc. manual
(see chapter 9, page 19-22).

2. Put reflector on two last suspension brackets.

3. Fix angled bracket D with screws and nuts M8 at

the suspension bracket before last, bracket grips
under reflector.

4. Brackets don’t mount at first and last suspension
bracket.

5. Put on next reflector, reflectors are fixed to another
by 3 screws/nuts M5, middle screw through angled
bracket.

6. Further assembling as usually acc. to manual
(see chapter 9, page 19-22).

Fig. 34, 35: Assembling order set angled mounting

D

B

A

C

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novoSchwank L

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ersion 007

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vo shape L international 18/15

Technical specification subject to change

Water protection cover

Protection cover of the burner unit 20S L - 55S L with
electrical protection class IP 55 against water or
aggressive mediums, cover complete in stainless steel.

In delivery scope a mounting set existing of:

 Protection cover with inlet air adapter

(premounted and sealed),
hinged cover plate and premounted surrounding
rubber seal

 Gas inlet connection with union fitting (premounted)
 Gasket

for mounting water protection cover and

radiant tube

Assembly instruction

1. Divide gas inlet connection at the union fitting

2. Install with sealant the half of the divided gas inlet
connection with coupling fitting to male thread gas
connection burner unit.

Note 45S L – 55S L: First replace reducing
nipple ¾“x ½“ from burner unit!

3. Mount complete burner including burner baffle
(only units 20S L / 25S L / 35S L / 45S L) into
protection box, front fixing bolt at burners flange
reaches through front of the protection box.

4. Pass other half gas inlet connection through PG
gland and connect with burner unit. Union fitting
first tighten by hand.

5. Stick gasket on protection box with silicon. Mount
complete protection box with burner unit inside at
radiant tube flange with gasket between tube
flange and protection box. Fix front fixing bolt of the
burner unit tight with flange radiant tube.

6. Tighten union fitting of the gas inlet connection
with tool.

7. Assemble electrical connection through PG grand
and connect with device plug, if necessary pass
cable for 2-stage or modulating regulation through
the second PG grand.

8. Fit tight the counter nuts of all PG glands.

9. Connect the heater with an approved flexible gas
hose.

Note 45S L – 55S L: Mount reducing nipple
¾“x ½“on outer thread gas inlet connection
with sealant!

10. Start tube heater, check gas pressures.

11. Close cover plate water protection box with two

wing screws.

Fig. 36: Mounted burner unit in protection cover with

gas inlet and electrical connections

Fig. 37: Complete mounted and closed water protection cover

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Gas filter - groups

To avoid technical problems with the gas combination
valves which are caused by pollution of dust or rust
coming out of the gas pipe have to be mounted a
gas filter-group ¾“ (gas filter + premounted double
nipple) for each tube heater 50L.

For tube heaters 15-30L a similar gas filter-group ½“
has to be ordered in case the gas pipe is made of black
steel (welded).

Assembly instruction

Direct installation between flexible gas pipe and valve
burner unit, with a slight radial slope for better cleaning
the filter bottom! In case of strong polluted filter pad use
the corresponding spare part set for gas filter.

Pay attention to the flow direction of the filter!

Fig. 38: Mounted gas filter-group at tube heater

gas filter-group Rp ½“
for 20S L – 35S L

code no: 192 0756 0

gas filter-group Rp 3/4“
for 45S L – 55S L

code no: 192 0757 9

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Technical specification subject to change

15 Spare parts

Fig. 39: Spare parts novoSchwank 35S L

Spare parts novoSchwank 20S L – 55S L

Pos. Part Art.-No.

1

Burner unit novoSchwank 20S Natural gas 126 9111 1

Burner unit novoSchwank 25S Natural gas 126 9121 1

Burner unit novoSchwank 35S Natural gas 126 9131 1

Burner unit novoSchwank 45S Natural gas 126 9171 1

Burner unit novoSchwank 55S Natural gas 126 9151 1

2 Radiant tube 3050mm novoSchwank 126 7020 0

3 Radiant tube 4540mm novoSchwank (not in Fig. 40) 126 4722 0
4 Radiant tube L 3050mm with burner flange (not in Fig. 40) [only for herringbone systems] 126 7069 0
5 Radiant tube L4540mm with burner flange (not in Fig. 40) [only for herringbone systems] 126 7070 0

6 Gasket between tubes and burner novoSchwank 126 7048 0

7 Reflector novoSchwank shape L (L 3000mm) 126 7277 0

8 Reflector short novoSchwank 55S L (L 1500mm) (not in Fig. 40) 126 7277 1

9 Reflector segment novoSchwank 35S L (L 115mm) 126 7071 0

10 Reflector segment novoschwank 45S L and 55S L (L 205mm) (not in Fig. 40) 126 7409 0

11 Hanger novoSchwank shape L 126 7044 0

12 Tube clamp 126 4529 5

13 Tube clamp (black painted) 126 4510 4

14 Mounting set novoSchwank 20S L / 25S L (not in Fig. 40) 126 7105 0
15 Mounting set novoSchwank 35S L (not in Fig. 40) 126 7106 0
16 Mounting set novoSchwank 45S L (not in Fig. 40) 126 7107 0
17 Mounting set novoSchwank 55S L (not in Fig. 40) 126 7113 0

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Fig. 41: Spare parts burner unit

Spare parts burner unit novoSchwank 20S L – 55S L

Pos. Part Art.-No.

1 Spark igniter with ionisation cable 127 0246 9

2 Ignition wiring with plug 126 7021 0

3 Control Microgas P25 126 7495 0

4 Pressure switch DL1E with damping nozzle 192 0217 8

5

Spare part gas valve cpl. premounted – replacement HONEYWELL for SIT
novoSchwank 20S L – 55S L / with cable valve – in cardboard

126 7532 1

6

Spare part gas valve HONEYWELL for HONEYWELL 1-stage VK 4105C

192 0765 0

7 Burner cup aluminum complete novoSchwank 20S L– 35S L 126 7239 0

8 Burner cup steel complete novoSchwank 45S L natural gas, 55S L propane 126 7219 0

9 Burner cup steel complete novoSchwank 55S L natural gas 126 7468 0

10 Fan complete with venturi novoSchwank 20S L – 55S L with transport lock 126 7684 0

11 Fan complete with venturi novoSchwank 55S L (valid only for heaters sold up to May 2015) 126 7053 0

12 Gas filter complete ½“ (for novoSchwank 20S L– 35S ) (not in Fig. 41) 192 0756 0
13 Gas filter complete ¾“ (for novoSchwank 45S L – 55S L) (not in Fig. 41) 192 0757 9
14 Spare part kit for gas filter ½“ (not in Fig. 41) 192 0758 0
15 Spare part kit for gas filter ¾“ (not in Fig. 41) 192 0759 0

novoSchwank L

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16 EC type examination certificate

novoSchwank L

41

Version 007novo shape L international

18/15

Technical specification subject to change

novoSchwank L

42

V

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no

vo shape L international 18/15

Technical specification subject to change

17 EC declaraction of conformity