AUTOTERM AIR-2D 12V/24V User manual

v06.2021
EN
User’s manual
with installation instructions
for AUTOTERM air heaters
AIR-2D 12V/24V
AIR-4D 12V/24V
AIR-8D 12V/24V
AIR-9D 12V/24V
Paleju 72, Marupe, Latvia, LV-2167
Warranty Department [email protected]
Technical Support [email protected]
www.autoterm.com
Manufacturer: AUTOTERM LLC

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Table of contents
Introduction .................................................................................................................................3
1General instructions and operating principle...............................................................................4
2Safety precautions .......................................................................................................................5
Retrofitting ..................................................................................................................................7
3Main requirements of installation of assemblies and units of the heater ....................................8
3.1 Installation of the heater.........................................................................................................9
3.2 Installation of the air intake pipe..........................................................................................12
3.3 Installation of the exhaust pipe. ............................................................................................14
3.4 Installation of the fuel system................................................................................................17
3.5 Installation of wiring of the heater. ......................................................................................21
3.6 Installation of the temperature sensor (optional). ................................................................22
3.7 Installation of the control panel............................................................................................22
4Testing of the heater after installation and first launch.............................................................23
4.1 Automatic Control Features..................................................................................................24
5Installation of air ducts..............................................................................................................24
6Recommendations. ....................................................................................................................27
7Malfunctions..............................................................................................................................29
8Warranty Terms.........................................................................................................................31
Annex 1: Basic parameters & specifications of heaters................................................................32
Annex 2: Connection diagrams of heaters.....................................................................................34
Annex 3: Size and dimensions of heaters.......................................................................................37
Annex 4: Electrical wiring diagrams of heaters............................................................................39

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Dear Customer!
Thank you for choosing AUTOTERM AIR heater! We are doing everything to make this
product meet your requirements, so its quality satisfies every customer.
Introduction
This manual is intended for organizations that specialize in installation and maintenance of
air heaters AUTOTERM AIR (2D 12V/24V; 4D 12V/24V; 8D 12V/24V; 9D 12V/24V)
(hereinafter referred to as heaters, or 2D, 4D, 8D and 9D for shorter)) and users of the product after
installation. The document covers main rules of installation of the product on different land
vehicles and small maritime transport (e.g. yacht, boat, cutter), function tests of the product after
installation and basic maintenance procedures to ensure reliable operation of the heater.
Please read this manual before installing and/or operating the AIR heaters. This manual
contains needful information in order to use this product correctly. Disregard of these instructions
can void the warranty of the product, lead to damage of product and/or property and be a risk to
health.

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1 General instructions and operating principle
The AUTOTERM AIR heaters are designed to be used:
•for heating of various confined spaces, of vehicles for example driver’s cabin or
cargo compartment of vans or trucks at ambient temperatures up to -45°C.;
•for heating cabins, cargo compartments and other various confined spaces of
maritime transport;
The heater operates independently of the vehicle engine.
Heaters built-in fan draws air through the air intake opening. The air heated by the heater is
channelled to cabins and desired spaces via outlet channels.
Fuel is supplied by a separate fuel pump from the fuel tank of the vehicle or vessel or from
an additional fuel tank.
The heater can be powered by a battery of the vehicle or a separate battery.
Temperature in rooms can be regulated by using a temperature sensor and a control panel,
which sets heating parameters.
When a temperature sensor is present (either built in to the control panel or additionally
installed), the heater is constantly comparing the actual temperature with the set temperature and
automatically adjusts the heating capacity according to the heat demand
Installation of the heater and its components must be carried out by specialized
organizations approved by AUTOTERM. Installation of the heater must be carried
out only by certified specialists in accordance with the installation instructions.
If the heater is handled and/or installed improperly, there is a possibility of a fire
hazard and damage of property because fuel and electrical components are being
used. That is why all safety precautions and installation instructions must be
observed.
Basic parameters and specifications of the heaters can be found at the end of this manual (see
Annex 1).

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2 Safety precautions
•Do not use or install the heater in places, where flammable vapors or gases
or large amounts of dust may form and accumulate.
•Disable the heater, when the vehicle or vessel is being fueled.
•Do not cover the heater with clothing, pieces of fabric and so on, and do not
place such objects in front of the air intake pipe or inlet and output of the
heated air.
•Do not install the fuel line inside the cabin of a vehicle.
•The installation arrangement must exclude the possibility of contact of
the exhaust pipe with the air intake, fuel pipe, or other flammable
objects.
•The vehicle where the heater is installed must be equipped with a fire
extinguisher.
•Do not install electric wiring (harnesses) of the heater near the fuel line and
the exhaust pipe.
•Disconnect the heater from its battery during repair works on the heater.
•Do not connect the heater to the power circuit of the vessel, when the engine
is operating and there is no battery.
•Do not connect or disconnect connectors of the heater, when the heater is
powered.
•When electric welding is carried out on the vehicle, or repair work is made
on the heater, the heater must be disconnected from the battery.
•Do not use fuses rated differently from indicated on the electric circuit
diagram.
•Do not use makeshift devices (wires etc.) instead of fuses.

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•Take the safety precautions, which must be observed when working with
an electrical and fuel systems, when installing and dismantling the heater.
•Do not disconnect the heater from power before the purge cycle ends.
•When the heater has been switched off, do not switch it on again for 5-10
seconds.
•Due to poisonous exhaust gases and risk of suffocation, DO NOT use
the heater in closed and/or unventilated places (e.g. garage, workshop,
etc.)
•Do not step on the heater or put any objects on it and in it.
•Electric wiring, the air intake, and the fuel pipe must be protected from
contact with sharp edges of vehicle structures.
•For safety reasons, contact the service shop to troubleshoot the heater if it
fails to launch two times in a row.
•In case of faults in the operation of the heater, contact specialized repair
organizations authorized by AUTOTERM.
If the consumer fails to follow the requirements above, the warranty of the heater becomes
null and void.

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Retrofitting
For replacing different brand of heater for an AUTOTERM AIR heater, following things
must to be checked first:
Diameter of exhaust pipe.
The AIR-2D and AIR-4D have an exhaust pipe with an internal diameter of 24mm and AIR-
8D and AIR-9D have an exhaust pipe with an internal diameter of 38mm.
Some brands use different diameter exhaust pipes, if so, it needs to be changed to necessary
diameter suitable for the heater in use. Larger diameters can be used, if needed. (see “Section 3.3”,
for more information on installing the exhaust pipe).
Disregard of this advice can lead to insufficient output of exhaust gases due to
backpressure, thus damaging the heater.
Fuel system.
When retrofitting a heater, all old fuel pipes and fuel pumps must be removed completely
and suitable fuel system for AUTOTERM AIR heater must be installed instead.
Different brands of fuel pumps can have different fuel output and fuel pipes can be in
different diameter. (see “Section 3.4”, for more information on installing the fuel system).
Disregard of this advice can cause fuel overflow in the heater or insufficient flow
of fuel, thus damaging the heater.
Electrical wiring.
All old wiring, electrical connections, control panels, etc. must be removed and installed with
new AUTOTERM AIR suitable components. (see “Section 3.5”, for more information on
installing the wiring of the heater).
Electrical related faults are common when using different and unsuitable
electrical components.
Diameter of air ducts.
At least 60mm air duct must be used for AIR-2D, at least 90mm air duct for AIR-4D, and at
least 100mm for AIR-9D. If the existing air duct is smaller in diameter, then everything must be
changed up to the first branch with the necessary diameter and as well as the first hot air outlet.
After that the size of air duct can be decreased using different adapters (see “Section 5”, for more
information on air ducting).
Disregard of this advice can cause the heater to overheat, thus damaging it.
DO NOT connect air ducts to AIR-8D.

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3 Main requirements of installation of assemblies and units of the heater
Heater can be installed both inside, and outside of the vehicle. Install the heater in a dry place
that is protected from ingress of water and condensate, dirt, excessive vibrations and heat
emissions, engine emissions or fuel or oil contamination.
Installing the heater on a maritime transport it must be protected from ingress of
overboard water.
Consider the maximum heel of the vessel. A heel must not bring overboard water
into the discharge channel for exhaust gases, and bilge or overboard water must not
get on the heater.
Installing the heater in a cargo hold of the vehicle, install the heater at a height and
location that prevents contact with cargo and in a way that the cargo would not
obstruct the intake/outlet of the heater.
The heater must be installed following safety requirements and taking into account the type
of vehicle or vessel. Consider everything related to peripheral equipment, for example, the
maximum permissible length of the exhaust gas channel and intake of air for combustion, the
location of the passage in the board (for maritime transport), the layout and length of electric wires,
distance from the fuel tank, layout of air ducts of warm air, intake of fresh air.
All precautions must be observed when installing the heater to reduce the risk of injuries to
personnel or damage to the equipment as much as possible.

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3.1 Installation of the heater
Install the heater, taking into consideration permissible operating position according to
Fig.1a/b. Take into account the possible heel of the vessel, if installing on a maritime transport.
When heater is positioned with exhaust pipe facing downwards and air inlet facing towards
you, it is considered 0° position. AIR-2D and AIR-4D can be tilted everything between 0 and 90°.
From the same point of view, wires on the 2D and 4D must remain on the right side or on the top
of the heater. The AIR-8D and AIR-9D should not be tilted (see Fig.1a).
WARNING!!! Reliable operation of the heater depends on correct installation
of the heater. The heater must be installed horizontally (according to Fig.1a).
AIR-2D; AIR-4D
AIR-8D
AIR-9D
* - view of the heater from the side of the air intake
Fig. 1a - Mounting positions of the heater

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Fig. 1b –Distance from walls
The distance from surrounding objects must be sufficient to ensure good ventilation. The
distance from walls and partitions to the start of the inlet opening of the heater must be no less than
50mm for AIR-2D/4D and 100mm for AIR-8D/9D (see Fig.1b). The distance from walls,
partitions to the start of the outlet opening of the heater must be no less than 150mm for AIR-
2D/4D and 250mm for AIR-8D/9D. Provide protection from penetration of foreign objects into
intake and output openings, when installing and operating the heater. Install the heater so that it is
convenient to do maintenance works.
For installing air ducts, these distances need to be considerably greater (see “Section 5”, for more
information on air ducting).
DO NOT install near flammable or heat-sensitive objects such as sails, fenders,
clothing, sheets, paper, gas pipelines, fuel tanks, etc.
When installing the heater, make sure that the mounting flange is the only place of contact
with the mounting surface of the vehicle or vessel. The casing of the heater should not contact
any surface (Fig.2b), to avoid deformation of the heater casing, jamming of the air blower fan
and potential overheating.
Install the heater on a flat surface, because installing on uneven surface, can bend
the casing of the heater, thus blocking the fan (common cause of error 27).
AIR-2D, AIR-4D
AIR-8D, AIR-9D

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It is recommended to use an appropriate
mounting bracket specific for desired mounting
location (variety of mounting brackets can be
purchased at your local dealer) and the rubber seal
(seen in Fig. 2) for the installation surface of the
heater, when installing the heater.
In case the heater is installed in a large
passenger van or a bus, it may be installed without
using mounting brackets.
In case the heater is installed onto a pedestal
or a mounting bracket, cover the air intake,
exhaust pipe, and the fuel pipe areas with a metal
cover.
Fig. 2b - Leave some free space
For heaters AUTOTERM AIR-2D and AIR-4D, holes in the body of the vehicle should be
made as shown in Fig.3. Heater can be installed using mounting plates shown on Fig. 2. In this
case studs provided with heater must be replaced with longer studs.
Fig. 3 –Mounting holes
AIR-2D; AIR-4D
AIR-8D AIR-9D
- DIRECTION OF AIR FLOW
отв –drill holes
Fig. 2a - Mounting plates
Rubber seal
Mounting plates
Stud
s

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Fig. 6a - Location of intake and exhaust pipes on land vehicles
Cut the opening inside the vehicle body (in case the side wall/floor is not thicker than 3 mm)
for AIR-8D heater installation as shown on Fig. 3. With the thickness of the vehicle body (floor)
of more than 3mm, installation of the heater requires the following:
1. Cut a rectangular hole in the vehicle body sized 180×95 mm
2. To attach the mounting bracket* to the heater (this bracket can be made of steel sheet at
least 2.5mm thick);
3. Install the exhaust pipe, air intake, and fuel line to the heater and fasten the whole
assembly to the body of the vehicle
*—optional part
3.2 Installation of the air intake pipe.
The air for combustion must not be taken from
the interior, living space, engine or luggage
compartment of the vehicle or vessel. Air should be
taken from well-ventilated areas or from outside of the
vehicle or vessel.
The maximum length of the air intake pipe is 2
meters. The air pipe must be as short as possible (cut to
the necessary length).
It is forbidden to use the heater without an
air intake pipe.
The air intake pipe is connected
directly to the pipe of the heater and
fastened with a clamp. (Fig.4).
When laying the air intake pipe, avoid
sharp bends and do not obstruct the
opening of the air intake pipe with foreign
objects. Make sure its opening is pointing
downwards (see Fig. 5). If that is not
possible Ø3mm hole needs to be drilled at the lowest point of the pipe.
The correct installation of the exhaust and air intake pipes is when they are on the same side
(Fig.6a/b). The distance between them should exclude re-suction of exhaust gases through the air
intake (at least 20 cm).
Fig. 4 –Connection of the air pipe to the
heater
Air intake pipe
Clamp 25x40
Heater
Fig. 5 –Position of air intake/exhaust pipe

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Fig. 6b - Location of intake and exhaust pipes on maritime transport
Disregard of this recommendation can lead to the opposite movement of the
flame towards the air pump fan, to melting of air pump fan and to burning of a
heater.
Air intake must not be installed in the movement direction of the vehicle/vessel.
In cases when intake of clean air cannot be ensured, such as off-road and special
purpose vehicles, please mount the dedicated AUTOTERM air filter (assy.2684)
3.2.1Installation of the air intake pipe on maritime transport
Air intake from well-ventilated areas
Ambient pressure and sufficient ventilation using outside air must be present in the air intake
zone. Increased or reduced pressure in the air intake zones is not allowed. It is recommended to
attach the air duct all along its length to the hull of the vessel using plastic clamps, when possible.
Put a cap on the end of the air duct to protect it from drawing in foreign objects.
Air intake from outside of the vessel.
An air intake pipe (Fig.7) should be used to take the air from outside Make an opening Ø26+1
mm in the board of the vessel to install it. Install a rubber gasket between the flange of the air
intake pipe and the hull of the vessel. Attach the air duct using three bolts as shown on Fig.7.
Attach the air duct to the air intake pipe using the clamp. It is recommended to attach the air duct
all along its length to elements of the hull of the vessel using plastic tie straps, when possible.
Make a 3mm opening in the bottom point of the air duct to drain condensate or any water, which
has penetrated the air intake pipe.
Do not place the intake opening of the air intake pipe in front of the
incoming air flow of the moving vessel

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Fig. 7 - Installation of the air intake pipe
1 –Air intake pipe;
4 –Gasket;
2 –Flange of the air intake pipe;
5 –Fastener assembly;
3 –Hull of the vessel;
6 –Clamp.
3.3 Installation of the exhaust pipe.
When installing the exhaust pipe, take into consideration
high temperature (up to 500°С) of the exhaust pipe when heater
is in operation. Cut the exhaust pipe (flexible crinkled metal
hose, maximum length –2 meters) to the necessary length. It is
advised to use two-layer exhaust pipe when installing the heater.
Attach the exhaust pipe (Fig.8) using clamps and install it so
that it is slightly inclined to the bottom in the direction of
exhaust. Install heat insulation on the exhaust pipe to protect
individual sections of the vessel (wiring or other heat-sensitive
objects).
Fig. 8 - Attachment of the metal pipe to
the heater
Install the exhaust pipe to avoid the possibility of repeated intake of exhaust gases by
the air intake pipe, and make sure that no exhaust gases enter the interior or are drawn
in by the fan through the cab heater radiator.
At the end of the exhaust pipe a shield is installed, which necessary for stable operation
at low heating modes (Fig.9).
Clamp
Heater
Metal exhaust pipe

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In absence of the shield, air will be blown back into the
exhaust pipe. This leads to increased heater shooting and
impairs heat capacity. Exhaust gases must be removed
outside of the vehicle.
Heater is provided with airtight exhaust silencer. This
mean it can be mounted in small vessels and confined spaces.
But for mounting exhaust silencer on the outside of the
vehicle, Ø5mm hole needs to be drilled at the bottom of the
silencer (see Fig. 10a).
If desired mounting situation requires the exhaust
silencer to be mounted vertically, condensate drain hole must
be drilled, like shown in Fig. 10b, to avoid condensate build
up in exhaust silencer. If that is not possible, it is
recommended to install it sideways (see Fig.10a).
Theoutlet of theexhaust pipe mustbe installed pointing
downwards (Fig. 5), but it should be in such a position that
would prevent clogging or entering of snow and dirt, and also
provide for free drain of any water that got into it.
Installing on maritime transport, silencer must be
mounted using the bolt and a nut provided, so it would be
in fixated position.
Make longitudinal cuts (about 15mm) (see Fig. 8,
Fig. 9 Fig.11) on ends of the metal hose to ensure better
sealing when connecting the heater pipe to the pipe for
discharge of exhaust gases through the board of the vessel, but
without going beyond the pipe to be covered.
Rubber bushing (sold seperatly) must be used if exhaust
pipe goes through plastic parts, for example, bumper of a
vehicle (see Fig. 11).
Cut 15 mm
Shield
Heat insulation
Fig. 9 –Exhaust pipe shield
Fig. 10a –Condensate drain hole for
horizontal mounting
5mm drill bit
Silencer
Condensate
drain hole
Silencer
Condensate
drain hole
5mm
drill bit
Fig. 10b –Condensate drain hole
for vertical mounting
Fig. 11 - Attachment of the exhaust pipe to the heater and usage of rubber bushing
Exhaust pipe
Bolt and nut
for fixation
Clamp
Clamp
Cut
Silencer
Exhaust pipe
Cut
Cut
Rubber bushing
Insulation
Plastic partition

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The exhaust pipe needs additional insulation at every connection of the metal
hose, for example, using a heat resistant tape or sealant, to prevent any leaks of
exhaust gases at connection points.
Additional heat insulation must be installed at places where the exhaust pipe
goes through the floor or the side wall of the vehicle (Fig. 12) to avoid
unnecessary fire hazard.
The end of the metal hose should not contact the rubber seal of the heater. It is advised to
install the discharge of exhaust gases in a way, that does not allow exhaust gases to flow inside the
spaces used by people, like drivers’ cabin or living quarters of maritime transport (e.g. away from
open windows, doors), to avoid the possibility of inhaling dangerous exhaust gases.
Do not place the output opening of the exhaust pipe in front of the incoming
airflow of the moving vehicle or vessel (see Fig. 5).
3.3.1. Installing exhaust adapter on maritime transport
Exhaust gases are discharged overboard the vessel. Install the discharge of exhaust gases in
a location inaccessible to water (at least 60 cm above the waterline) and to avoid the possibility of
repeated intake of exhaust gases by the air intake pipe.
To install the exhaust pipe adapter (hull fitting), drill a hole in the hull of the vessel at least 5
mm larger in diameter than actual outer diameter of the hull fitting. Install the exhaust pipe into it
as per Fig.13 with the pipe looking upwards (to avoid penetration of water). Install a rubber gasket
between the flange of the exhaust pipe and the hull of the vessel to seal the connection.
To prevent exhaust gas leaks or falling off of the
exhaust pipes, it is advised to use an exhaust cement or
different kind of sealant on every connection of the exhaust
pipe Sailboats should not install the exhaust adapter on the
side of the hull, only at the stern.
1 –Exhaust pipe adapter;
2 –Flange of the exhaust pipe;
3 –Gasket;
4 –Hull of the vessel;
5 –Fasteners;
6 –Clamp;
7 –Metal hose.
Insulation
Fig. 12 –Installation of additional heat insulation
Fig. 13 - Installation of the exhaust pipe

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Heater
3.4 Installation of the fuel system.
Do not operate the heater using biofuel.
Use only diesel fuel standard EN590, depending on the ambient temperature.
Act as instructed on Fig.14 and Fig.17 to install the fuel system. The fuel pump and the fuel
supply line must be protected from heating.
It is recommended to install a small inline fuel filter before the fuel pump. Make sure that the
filter is completely filled with fuel. Also make sure that you’re using fuel lines of the same diameter
as provided with the heater.
Do not take fuel from fuel filter or it’s casings, because doing so causes a leak of fuel.
Do not take fuel from the fuel line between the fuel filter and fuel pump of the
vehicle’s engine, the return line of the engine or after the high-pressure pump of the
vehicle. Heater is not designed to work with such high pressure.
Fuel line system should be as short as possible. Recommended maximum length of
the fuel line is 5m. Distance between fuel tank and fuel pump should not exceed 1m
and distance between fuel pump and the heater should not exceed 4m (see Fig.14 and
Fig.17)
3.4.1 Fuel suction using a fuel suction hose.
Before installing a fuel suction hose in a fuel tank of the vehicle or vessel, make sure
that the fuel level is high enough to ensure operation of the heater, and low enough to
easily remove the fuel tank, if needed.
1 –Fuel tank of the vehicle
4 –Fuel pump
2 –Fuel suction hose
5 - Coupling
3 –Fuel line
Fig. 14 - Example of fuel supply to the heater with fuel suction hose

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Fuel is taken directly from the fuel tank of the
vehicle or vessel or an additional tank. Drill a hole
Ø16mm in the fuel tank to install a fuel suction hose.
When drilling the hole in the fuel tank, follow safety
precautions that should be observed when working
with a transport, which is filled with fuel or explosive
substance.
If needed, cut the immersible tube of the fuel
suction hose shorter before installation. Its bottom end
must be located about 10-15 mm above the bottom of
Fig. 15a –Installation
of the fuel suction hose
Fig. 15b –Installation of
the washer.
the tank, or at the height to provide fuel for engine in the fuel tank at any time. The cut at the end
of the fuel suction hose must be made at a 45° angle to the axis of the tube. Remove all burrs from
the cut after the work is done.
Install the fuel suction hose in the fuel tank as per Fig.15a. Install the special washer of the fuel
suction hose in the tank hole as per Fig.15b. Apply a fuel-proof sealant on the threaded surface of
the fuel suction tank to properly seal the connection between the fuel suction hose and the fuel
tank.
Never install the suction hose on the side of the fuel tank. It must be installed on the
top side of the fuel tank.
3.4.2 Fuel suction from an additional fuel tank
Consider convenience of fuelling, when installing the fuel tank
(Fig.16). Install the fuel tank in such a way that the amount of fuel and
its potential leaks from the inlet, fuel suction nozzle or connections can
be visually controlled.
When filling the fuel tank, be careful not to spill any of
the fuel on the exhaust system, wiring or other objects,
which can be damaged due to their contact with fuel.
Fuel tank must be installed with its wide side
perpendicular to the direction of the movement of the
vehicle/vessel (see Fig. 16).
Fig. 16 Installation of the
fuel tank
Wall/hull of the
vehicle/vessel
Fuel tank
cap
Fuel tank
Bracket
Direction of movement
of the vehicle/vessel

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3.4.3 –Fuel suction from the fuel tank of the vehicle.
Fuel is taken from a fuel line of the vehicle using a T-piece (see Fig.17). This method can be
used if there is no pressure in the fuel line. If vehicle is equipped with a low-pressure fuel pump in
the fuel tank, then those fuel lines cannot be used, fuel suction hose must be installed instead. Mind
the installation position of the T-piece.
3.4.4 Installation of the fuel pump and the fuel supply line.
The fuel pump is connected to the heater through
its own harness and supplies fuel depending on the
required heat capacity to the combustion chamber of
the heater. The fuel pump is operated by electrical
impulses sent by the control unit. When running, the
fuel pump makes characteristic metallic clicking
noise.
It is recommended to install the fuel pump
close to the fuel tank (distance should not exceed
1 meter (see Fig.14 and Fig.17)) and below the low level of fuel in the fuel tank, but not lower than
70cm of the minimal fuel level (see Fig.19, point a)). But the distance between the fuel pump and
the heater cannot be greater than 1,5 meters (see Fig.19, point b)). Fuel pump should be positioned
with a slight angle pointing upwards (see Fig.18)
If for some reason sealing of the fuel pump is compromised, it is advised to install the fuel
pump lower than the heater in order to avoid leaks and overflooding the heater with fuel due to
gravity.
Remember to properly bleed the “silent” TH11 fuel pump. If it’s not properly bled
it will be as loud as standard fuel pump.
To bleed it start the heater and position the fuel pump with its outlet upwards till
there are no air bubbles in the fuel line and only then secure fuel pump in its
recommended position.
Fig. 17 –Fuel suction using a T-piece
Heater
1 –Fuel tank of the vehicle
4 –Fuel pump
2 –Fuel line of the vehicle
5 - Coupling
3 –Fuel line
6 –T-piece
Fig. 18 – Installation angle of TH-9; TH-10; TH-11
fuel pump (1) and Thomas Magnete (2) fuel pump.

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Attach the fuel pump to the flexible rubber clamp (supplied with the heater), which reduces
the transfer of noise to the frame of vehicle or hull of the vessel. (see Fig. 20)
Act as instructed on Fig.14 and Fig.17 to install the fuel supply lines. Use clamps to attach
fuel supply lines. Do not tighten the clamps too much trying to avoid leaks because clamps break
easily if tightened with too much force.
It is preferable to lay the fuel supply line on a straight line and with a small inclination
upwards in the direction of the heater. The fuel supply line should be fastened at equal distances
to prevent sagging, prevent effects of vibrations and avoid fractures. Do not allow contact of the
fuel pump and the fuel supply line with hot objects. Cut the fuel supply line only using a sharp
knife as per Fig.21. At the locations of cuts, there should be no narrowing of the flow cross-section
of the fuel line, dents or kinks.
Fig. 19 –Height position of the fuel pump in the fuel system
Heater
Recommended level for
installation of fuel pump
Minimal level of fuel
1 –Additional fuel tank;
4 –Coupler;
2 –Fuel tank of the vehicle;
5 –Fuel pump
3 –Fuel suction hose;
a=70 cm
b=1,5 m
Fuel line
Fig. 20 - Flexible rubber
clamp
Fig. 21 - Cutting of the line before installation.