AUTOTERM FLOW-5D User manual

v02.2021
EN
User’s manual
with installation instructions
for AUTOTERM Liquid heaters.
FLOW-5D 12V/24V
FLOW-5B 12V
FLOW-14D 12V/24V
Manufacturer: ADVERS LLC
Novo-Sadovaja str. 106, 443068, Samara, Russia
www.autoterm.ru
Representative office of manufacturer: AUTOTERM LLC
Paleju 72, Marupe, Latvia, LV-2167
Warranty Department [email protected]
Technical Support [email protected]
www.autoterm.com

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Table of contents
Introduction......................................................................................................................... 3
1General instructions and operating principle.............................................................. 4
2Safety precautions....................................................................................................... 5
Retrofitting.......................................................................................................................... 7
3Main heater unit and assembly installation requirements........................................... 8
3.1 Installation of the heater.......................................................................................... 9
3.2 The installation of the coolant system....................................................................10
3.3 Installation of the air intake pipe...........................................................................12
3.4 Installation of the exhaust pipe.............................................................................. 14
3.5 Installation of the fuel system. ............................................................................... 17
3.6 Installation of heater wiring. .................................................................................21
3.7 Installation of the control panel............................................................................. 23
4Testing the heater after installation and first launch................................................. 23
4.1 Automatic Control Features .................................................................................. 24
4.2 Vehicle alarm wire start......................................................................................... 24
5Recommendations..................................................................................................... 25
6Malfunctions..............................................................................................................26
7Warranty Terms......................................................................................................... 28
Annex 1: Basic parameters & specifications of heaters .................................................29
Annex 2: Connection diagrams of heaters...................................................................... 30
Annex 3: Size and dimensions of heaters ........................................................................ 32
Annex 4: Electrical wiring diagrams of heaters .............................................................33
Annex 5: Periodic maintenance table .............................................................................35
Annex 6: Maintenance check list..................................................................................... 36

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Dear Customer!
Thank you for choosing the AUTOTERM FLOW heater! We are doing everything to
make sure this product meets your requirements. It is essential to us that the quality of our
products satisfies every customer.
Introduction
This manual is intended for organizations that specialize in the installation and
maintenance of AUTOTERM FLOW liquid heaters (5D 12V/24V; 5B 12V; 14D 12V/24V)
(hereinafter referred to as heaters, or 5D, 5B, and 14D for short), as well as users of the
product after installation. The document covers instructions and guidelines for the
installation of the product on a variety of land vehicles, and small maritime vessels (e.g.
yacht, boat, cutter). It also covers function tests of the product after installation, and basic
maintenance procedures to ensure the heater operates reliably.
Please read this manual before installing and/or operating the FLOW heaters.
This manual contains important information to use this product safely and
correctly. Disregarding these instructions can void the warranty of the
product, lead to damage of product and/or property, and be a health risk.

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1General instructions and operating principle
AUTOTERM FLOW heaters are designed to be used for:
•pre-heating vehicle engines with liquid cooling systems at an ambient air
temperature of up to –45°С;
•defrosting windshields, heating cabins, cargo compartments, and other confined
spaces in vans, trucks, and maritime vessels with a central liquid heating system.
The heater operates independently of the vehicle engine.
The operating principle of the pre-heater consists of heating the fluid in the cooling
system, which is pumped through the heat exchanger system.
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 vehicle battery or a separate battery.
The operation of the heater is controlled by the control unit, which controls the
temperature of the coolant fluid depending on its set parameters.
If the coolant temperature exceeds the set temperature, the heater switches to the
cooling mode: combustion stops, but the pump continues to circulate the coolant
throughout the vehicle’s heating system. As soon as the coolant temperature drops to the
pre-set temperature, the heater switches on again.
The liquid heater continues working for between 20 to 120 minutes (determined in
its settings), or until it is shut down. The purging duration is around five minutes.
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
fire hazard and damage to property because of the use of fuel and
electrical components. This is why all safety precautions and installation
instructions must be carefully read and followed.
Basic parameters and specifications of the heaters can be found at the end of this
manual (see Annex 1).

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2Safety precautions
•Do not use or install the heater in places where flammable vapors,
gases, or large amounts of dust may accumulate.
•Disable the heater when the vehicle or vessel is being fuelled.
•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.
•Do not install the fuel line inside the cabin of a vehicle.
•The installation configuration 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 the heater electric wiring (harnesses) near the fuel line
and the exhaust pipe.
•Disconnect the heater from its battery during repair work 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 heater connectors, 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.
•Disconnect the heater from the power supply when jumpstarting the
vehicle.
•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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•The relevant safety precautions must be observed when working with
coolant liquids and electrical and fuel systems when installing and
dismantling the heater.
•Do not disconnect power from the heater 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 the 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, theair intake, and the fuel pipe must be protected
from contact with sharp edges of vehicle structures.
•If any work was done on a cooling system (repair or replacement of
coolant), it is necessary to bleed the system.
•For safety reasons, contact the service shop to troubleshoot the heater
if it fails to launch twice in a row.
•In case of faults in theoperation of the heater, contact only 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
When replacing a different brand of heater for an AUTOTERM FLOW heater, be sure
to first check the following things:
Diameter of the exhaust pipe.
The FLOW-5D and FLOW-5B have an exhaust pipe with an internal diameter of 24mm,
and the FLOW-14D has an exhaust pipe with an internal diameter of 38mm.
Some brands use exhaust pipes with different diameters. If so, it needs to be adjusted to
a diameter suitable for the heater in use. Larger diameters can be used if needed. (see
“Section 3.4”, for more information on installing the exhaust pipe).
Disregarding these instructions can lead to an 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 completely
removed, and a suitable fuel system for the AUTOTERM FLOW heater must be installed
in its place.
Different brands of fuel pumps may have different fuel outputs, and their fuel pipes may
have a different diameter. (see “Section 3.5”, for more information on installing the fuel
system).
Disregarding these instructions can cause fuel to overflow in the heater, or
lead to an 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 FLOW components. (see “Section 3.9”, for more information on
installing the wiring of the heater).
Electrical related faults are common when using different and unsuitable
electrical components.
Coolant system.
When retrofitting a heater, all old coolant pipes and water pumps must be completely
removed, and a suitable coolant system for the AUTOTERM FLOW heater must be
installed in its place.
Different brands of circulation pumps may have different liquid output and coolant pipes
may have a different diameter. (see “Section 3.2”, for more information on installing the
coolant system).
Disregarding these instructions can cause the heater to overheat, thus
damaging it.

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3Main heater unit and assembly installation requirements
The heater can be installed inside, and outside of the vehicle. Install the heater in a
dry place that is protected from water, condensation, dirt, excessive vibrations, heat
emissions, engine emissions, and fuel or oil contamination.
When 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 will not obstruct the air intake for the combustion and exhaust
systems.
When installing the heater in the engine compartment, under the front
bumper or under the vehicle, make sure that it is protected from road spray,
rocks, or other contaminants.
It should never be submerged in water or any other type of liquid.
The heater must be installed below the level of the coolant expansion
tank.
When installing the heater on a maritime vessel, it must be protected from
water.
Consider the maximum heel of the vessel. Maximum heel must not bring
water into the discharge channel for exhaust gases. Bilge and water must
also not get on the heater.
The heater cannot be installed in coolant systems where coolant system
pressure can exceed a pressure of 2.1 bar.
The heater must be installed following safety requirements and taking into account
the type of vehicle or vessel being used. Consider everything related to peripheral
equipment, for example, the maximum permissible length of the exhaust gas channel, the
intake of air for combustion, the location of the passage in the board (for maritime vessels),
the layout and length of electric wires, the distance from the fuel tank, and the layout of the
coolant pipes.
All precautions must be observed when installing the heater to reduce the risk of
injuries to personnel, or damage to the equipment.

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3.1 Installation of the heater
Install the heater, taking into consideration the permissible operating position
according to Fig.1. Take into account the possible heel of the vessel, if installing on
maritime transport.
When the heater is positioned with the exhaust pipe facing downwards, it is
considered the 0° position. FLOW-5D and FLOW-5B have only two mounting positions
–0° and 90° with the air pump pointing upwards. The FLOW-14D should not be tilted
(see Fig.1).
WARNING!!! The reliable operation of the heater depends on the
correct installation! The heater must be installed according to Fig.1.
The FLOW 5 must be fixed to the mounting bracket with at least three M5x12 bolts,
tightened with a force of 10 Nm. The mounting bracket may be installed vertically or
horizontally. The mounting bracket must be fixed to the body of the vehicle with four M6
bolts, tightened with a force of 11.8 Nm (see Fig. 2).
The FLOW 14D standard bracket is fixed to the body of the vehicle or vessel with four
M8 bolts, tightened with a force of 22 Nm. (see Fig. 3) It is recommended to install the
heater under the bonnet of the vehicle or in the engine room of the vessel.
Fig. 1 - Mounting positions of the heaters
Fig. 2 - Mounting of FLOW 5
Fig. 3 - Mounting of FLOW 14D
Admissible angle of slope

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When installing the FLOW series heater make sure that the heater is
protected from any road spray, dust, water, and moisture.
The heater must be fixed properly to bypass any vibrations. It must be
installed in a well-ventilated area.
DO NOT install near flammable or heat-sensitive objects such as sails,
fenders, clothing, sheets, paper, gas pipelines, fuel tanks, etc.
3.2 The installation of the coolant system
Connect the liquid heater to the cooling system of the vehicle so that it is aligned to
the direction of the coolant flow within the cooling system (Fig. 4a/b).
During installation, use the rubber hoses and shaped pipes included in the installation
kit of the heater. The hoses must be laid avoiding sharp bends or crimps and it must be
possible to maintain them in a raised position from the heater to ensure unrestricted air
bleeding.
When laying the hoses ensure that they are not installed beside the exhaust
system and engine parts, which are heated to a high temperature.
Before the first start of the liquid heater and after a change of coolant, ensure
that the device is properly bled. The presence of air in the system could result
in overheating of the liquid heater.
Make sure that all pipe joints are properly tightened and leak proof.
Fig. 4a –Coolant flow direction for FLOW 5
OUT
IN
Fig. 4b –Coolant flow direction for FLOW 14D

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3.2.1 Installation of the coolant pump
The coolant pump must be installed in the cooling circuit upstream of the liquid
heater. The coolant pump should be installed below the level of the expansion tank,
radiator, and heater.
The direction in which the coolant flows in the pump must be the same as in the
cooling system of the vehicle/vessel.
3.2.2 Angle pipes
To assist the installation process, the angle pipes can be turned by 180° for FLOW 5
or by 90° for FLOW 14D (see Fig. 6a/b).
To turn the pipes, loosen the screw in the fixation plates. Turn the pipes to the desired
position and retighten the screw in the fixation plate.
Do not rotate the pipes while the screw is being tightened. It will damage the
gaskets and cause a leak.
Angle pipes can be changed for straight pipes in the FLOW 5 (sold separately).
The installation position of the coolant pump must not cause an airlock inside
the pump. See the permissible installation positions in Fig.5.
Fig. 6a –Angle pipe fixation for FLOW 5
Fig. 6b –Angle pipe fixation for FLOW 14D
Fig. 5 –Position of the coolant pump

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3.3 Installation of the air intake pipe.
The air for combustion must not be taken from the interior, living space, engine
orluggage compartmentofthe 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 minimal length if required)
Make sure FLOW 14D air intake does not touch any rainwater or dirt blockage.
The air intake pipe is connecteddirectly to the pipe
of the heater and fastened with a clamp. (Fig.7a).
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 the opening is pointing
downwards (see Fig. 8).
If that is not possible, a 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.9a/b). The distance between them should exclude the re-suction of exhaust gases
through the air intake (at least 20 cm).
The heater must not be used without an air intake pipe.
Air intake
pipe
Clamp 25x40
Heater
Fig. 7a –Connection of the air pipe to the
FLOW 5
Fig. 8 –Position of air intake/exhaust pipe
Fig. 9a - Location of intake and exhaust pipes on land vehicles
Fig. 7b –Air intake of the FLOW 14D
Air intake

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Fig. 9b - Location of intake and exhaust pipes on maritime transport
Disregarding this recommendation can lead to the opposite movement of
the flametowards the air pump fan,resultingin themeltingofthe air pump
fan, and to the burning of the heater.
The air intake must not be installed in the movement direction of the
vehicle/vessel.
In cases when the intake of clean air cannot be ensured, such as off-road
and special purpose vehicles, please mount the dedicated AUTOTERM air
filter (assy.2684)
3.3.1 Installation of the air intake pipe on maritime vessels
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 permitted. It
is recommended that the air duct is attached along the entire length of the vessel's hull of
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.10) should be used to take in the air from outside. Make an
openingofØ26+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 in Fig.10. Attach the air duct to the air intake pipe using the clamp.
It is recommended to attach the air duct along its entire length to 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 condensation or any water that 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. 10 - 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.
3.4 Installation of the exhaust pipe.
When installing the exhaust pipe, take into
consideration the high temperature (up to 500°С) of the
exhaust pipe when the 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 a two-layer exhaust pipe when installing the heater.
Attach the exhaust pipe (Fig.11) using clamps and install
it so that it is slightly inclined to the bottom, in the
direction of the exhaust. Install heat insulation on the
exhaust pipe to protect individual sections of the vessel
(wiring or other heat-sensitive objects).
Fig. 11 - 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 is necessary for stable
operation at low heating modes (Fig.13).
In the absence of the shield, air will be blown back
into the exhaust pipe. This leads to increased heater
sooting and impairs heat capacity. Exhaust gases must be
expelled outside of the vehicle.
An airtight exhaust silencer is provided with the
heater. This means it can be mounted in small vessels
and confined spaces. When mounting the exhaust
silencer on the outside of the vehicle, a Ø5mm hole
needs to be drilled at the bottom of the silencer (see Fig.
14a).
Cut 15 mm
Shield
Heat insulation
Fig. 13 –Exhaust pipe shield
Clamp
Heater
Metal exhaust pipe

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Ifthedesiredmountingsituationrequirestheexhaust
silencer to be mounted vertically, the condensation drain
hole must be drilled, as shown in Fig. 14b, to avoid the
build-up of condensation in the exhaust silencer. If that is
not possible, it is recommended to install it sideways (see
Fig.14a).
The outlet of the exhaust pipe must be installed
pointing downwards (Fig. 8), and in such a position that
would prevent the clogging or invasion of snow and dirt,
and also provide a free drain for any water that gets into
it.
When installing on a maritime vessel, the silencer
must be mounted using the bolt and nut provided, so it
will be in a fixed position.
Make longitudinal cuts (about 15mm) (see Fig. 11,
Fig. 13, Fig.15) on the 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.
A rubber bushing (sold seperatly) must be used if
exhaust pipe goes through plastic parts. For example, the
bumper of a vehicle (see Fig. 15).
The exhaust pipe needs additional insulation at every connection of the
metal hose. For example, use a heat-resistant tape or sealant to prevent any
leaks of exhaust gases at connection points.
Additional heat insulation must be installed at all places where the exhaust
pipe goes through the floor or the sidewall of the vehicle (Fig.16) to avoid an
unnecessary fire hazard.
Fig. 15 - Attachment of the exhaust pipe to the heater and usage of rubber bushing
Fig. 14a –Condensate drain hole for
horizontal mounting
5mm drill bit
Silencer
Condensate
drain hole
Silencer
Condensate
drain hole
5mm
drill bit
Fig. 14b –Condensate drain hole for
vertical mounting
Exhaust pipe
Bolt and nut for
fixation
Clamp
Clamp
Cut
Silencer
Exhaust pipe
Cut
Cut
Rubber bushing
Insulation
Plastic partition

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If the exhaust pipes of the heater run through the living space or confined
space of the vehicle/vessel, solid stainless-steel pipes must be used. Flexible
exhaust pipes are only suitable for external use and use in engine rooms.
The end of the metal hose should not contact the rubber seal of the heater. It is highly
recommended to install the exhaust gas discharge system in such a way that does not
allow the exhaust gases to flow inside areas used by people; such as the driver's cabin or
the living quarters of a maritime vessel (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. 8).
3.4.1 Installing the exhaust adapter on maritime transport
Exhaust gases are discharged away from the vessel. Install the discharge of the
exhaust gases in a location inaccessible to water (at least 60 cm above the waterline) and
to avoid the possibility of re-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 the actual outer diameter of the hull fitting. Install
the exhaust pipe into it as shown in Fig.17 with the pipe looking upwards (to avoid water
infiltration). 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 the exhaust
pipes falling off, it is advised to use exhaust cement or
a 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. 16 –Installation of additional heat insulation
Fig. 17 - Installation of the exhaust pipe

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3.5 Installation of the fuel system.
Do not operate the heater using biofuel.
Use only diesel fuel standard EN590 andpetrol fuel standard EN228, depending
on the ambient temperature.
Use the instructions detailed in Fig.18 and Fig.21 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
the filter is filled with fuel, and that you are using fuel lines of the same diameter as the
heater.
Do not take fuel from the fuel filter or its casings, as doing so causes fuel leaks.
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.
The heater is not designed to work with such high pressure.
The fuel line system should be as short as possible. The recommended
maximum length of the fuel line is 5m. The distance between the fuel tank and
the fuel pump should not exceed 1m, and the distance between the fuel pump
and the heater should not exceed 4m (see Fig.18 and Fig.21).
3.5.1 Fuel suction using a fuel suction hose.
Before installing a fuel suction hose in the 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.
Fig. 18 - Example of fuel supply to the heater with fuel suction hose
Heater
1 –Fuel tank of the vehicle
3 –Fuel line
5 - Coupling
2 –Fuel suction hose
4 –Fuel pump

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Fuel is taken directly from the fuel tank
of the vehicle or vessel, or from an
additional tank. Drill a Ø16mm hole 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 any transport, filled
operating with fuel or explosive substances.
If needed, cut the immersible tube of the
fuel suction hose to make it shorter before
installation. The bottom end of the tube
must be located about 10-15 mm above the bottom of the tank, or at the height at which fuel
for engine can be provided to 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.19a. Install the special washer
of the fuel suction hose in the tank hole as per Fig.19b. 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.
3.5.2 Fuel suction from an additional fuel tank
Consider the convenience of fuelling, while installing the fuel
tank (Fig.20). 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.
The fuel tank must be installed with its wide
side perpendicular to the direction of the
movement of the vehicle/vessel (see Fig. 20).
Fig. 20 Installation of the
fuel tank
Fig. 19a –Installation of the
fuel suction hose
Fig. 19b –Installation of the
washer
Wall/hull of the
vehicle/vessel
Fuel tank
cap
Fuel tank
Bracket
Direction of movement of the
vehicle/vessel

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3.5.3 Fuel suction from the fuel tank of the vehicle.
Fuel is taken from the fuel line of a vehicle using a T-piece (see Fig.21). This method
can only be used if there is no pressure in the fuel line. If the 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. Keep in mind the installation position of the T-piece.
3.5.4 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 operating, the
fuel pump makes a characteristic, metallic clicking noise.
It is recommended to install the fuel pump
close to the fuel tank (the distance should not
exceed 1 meter (see Fig.18 and Fig.21)) and below
the low level of fuel in the fuel tank, but not lower
than 70cm of the minimal fuel level (see Fig.23,
point a)). But the distance between the fuel pump
and the heater cannot be greater than 1,5 meters
(see Fig.23, point b)). The fuel pump should be
positioned with a slight angle pointing upwards
(see Fig.22).
Fig. 21 –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. 22 –Installation angle of Advers fuel pump
(1) and Thomas Magnete (2) fuel pump.

20
If for some reason the fuel pump seal is compromised, it is advised to install the fuel
pump lower than the heater to avoid leaks and flooding 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 a standard fuel pump.
To bleed it start the heater and position the fuel pump with its outlet upwards
until there are no air bubbles in the fuel line and only then secure the fuel pump
to its recommended position.
Attach the fuel pump to the flexible rubber clamp (supplied with the heater), to reduce
the transfer of noise to the frame of vehicle or hull of the vessel (see Fig. 24).
Proceed as instructed on Fig.18 and Fig.21 to install the fuel supply lines. Use clamps
to attach the fuel supply lines. Do not tighten the clamps too much in trying to avoid leaks
as 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, mitigate the effects of vibration and to avoid fractures. Do not
allow the fuel pump and the fuel supply line to come in contact with hot objects. Cut the
fuel supply line using only a sharp knife as per Fig.25. At the locations of cuts, there should
be no narrowing of the flow cross-section of the fuel line, dents or kinks.
Fig. 23 –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. 24 - Flexible rubber
clamp
Fig. 25 - Cutting of the line before installation.