Standards and guidelines.......................... 17
Preface
This manual contains instructions for use of
the heaters as shown on the cover. The
information in this manual is important for the
correct and safe use of the heater.
Identification of the product (fig. 1)
The identification plate is attached to the side
of the heater. The identification plate contains
the following data:
AYear of manufacture
BSerial number
CProduction code
DVoltage data
ECapacity max (kW)
FCapacity max (MJ/h)
GType number
Environment
Note
The heater is made of various metals
and synthetic materials. The heater
also contains electronic parts, which
must be treated as electronic waste.
Please contact your dealer for further
information.
1SAFETY INSTRUCTIONS
1.1Pictograms in this manual
Caution
Indicates risk of damage to the
appliance.
Warning
Indicates a dangerous situation, that
can lead to death or serious injuries.
Warning
Always switch off power when
performing maintenance or repairs on
the hot air heater!
Hot
Some surfaces may be hot! Wait until
these parts have sufficiently cooled
down before performing
maintenance.
Service and technical support
Please contact your dealer or the
manufacturer for information about the
heater. Make sure you have the following
Suggestions and tips to simplify the
carrying out of the specified tasks or
actions.
data at hand: type and serial number of the
heater.
1.2Pictograms on the stationary used
oil fired heater(fig. 2)
Warranty and liability
For warranty and liability, see general
warranty regulations.
AInformation about the used oil.
BPositions of the burner: low and high.
CWarning for overheating and switch off.
DInstruction for use.
EInstruction for re-ignition.
AT 300-US series40.020.941 - rev. 04 - 20115
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1.3Use this product for its intended
use
The stationary used oil fired hot air heater
has been designed for heating of workshops
at mechanization companies, heating and
frost protection of halls, transit sheds and
warehouses and heating of garage
workshops.
Caution
If the heater will be installed indoors,
make sure that there is proper
ventilation in the room. Make sure the
flue gas can only flow to an outside
source separate from the room.
1.4General instructions
Warning
•Make sure that the heater is
properly installed, adjusted and
maintained.
•For all service and adjustments
contact qualified, competent and
authorized persons.
•Do not make any modifications to
the heater without the prior
written consent of the
manufacturer.
•Make sure to always follow the
local standards and guidelines as
well as the local requirements,
concerning environmental
quality, fuel, fire and electrical
safety.
•Read this manual carefully
before using the heater.
•Keep this document with the
heater.
•Follow the described procedures.
•Never lean against the heater.
Warning
•Do not create a fire hazard by
storing or using highly
inflammable materials near the
heater. Keep these materials at
adequate distance from the
heater:
-top side 6 inch (150 mm) for
the AT 307
-top side 48 inch (1200 mm)
for the AT 306
-front and sides 36 inch (900
mm)
-back and flue 18 inch (450
mm)
•Make sure there is enough air for
proper combustion.
•Make sure that the convector
heater has cooled down
sufficiently and that the plug has
been removed from the socket
before carrying out any repair or
maintenance work.
1.5Additional safety
Warning
•Connect the heater only to a
120 V / 60 Hz power supply.
•Replace fuses only with identical
spares.
•The heater must be grounded.
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Warning
•Use only the following types of
fuel:
•Automatic transmission oil
•Crankcase oil
•Diesel oil
•Hydraulic oil
•Domestic fuel oil
•Do not add the following
materials to the used oil:
•Anti-freeze
•Carburettor cleaner
•Paint thinner
•Parts washer solvents
•Gasoline
•Transformer oil
•Oil additives
•Any other inappropriate or
hazardous material
•Do not fill the tank while the
heater operates.
2INTRODUCTION
2.1Purpose
These stationary used oil heaters are direct
fired heaters with thermal protection and
connections for a flue with rain cap and
optional room thermostat.
The AT 307 is equipped with a hot air fan.
The hot air heaters have been tested at sea
level at a temperature of 68 °F.
2.2Working principle AT 306
The stationary used oil fired heater is
equipped with an electric motor for driving the
fuel pump.
Diesel oil is poured manually on a burner
dish, which is ignited with a burning paper
pellet. As soon as the burner dish is at the
right temperature, the pump thermostat
activates the fuel pump; the control light
flashes on. The fuel pump pumps the used oil
onto the burner dish. The used oil evaporates
due to the temperature of the burner dish.
The gas vapour burns.
The pump thermostat switches off the fuel
pump when a failure causes the heater to
overheat.
The fuel pump is switched off when the
heater is switched off.
The fuel supply has an overflow that ensures
that the used oil flows back into the fuel tank
when the fuel pipe is blocked.
The overflow protection switches off the fuel
pump when the burner dish overflows.
2.3Working principle AT 307
The stationary used oil fired heater is
equipped with three electric motors.
The first electric motor drives a fuel pump,
which pumps up the fuel from the fuel tank.
The second electric motor drives the
combustion air fan, which blows the
combustion air into the combustion chamber.
The third electric motor drives the hot air fan,
which extracts the hot air around the
combustion chamber. The hot air is blown
into the space to be heated.
Diesel oil is poured manually on a burner
dish, which is ignited with a burning paper
pellet. As soon as the burner dish is at the
right temperature, the pump thermostat
activates the fuel pump; the control light
flashes on. The fuel pump pumps the used oil
onto the burner dish. The used oil evaporates
due to the temperature of the burner dish.
The gas vapour burns.
The maximum thermostat switches off the
fuel pump when a failure causes the heater to
overheat.
The fuel pump is switched off when the
heater is switched off.
The fan thermostat switches on the motor of
the hot air fan, which causes the hot air to be
blown from the heater into the space to be
heated.
The hot air fan runs until the fan thermostat
switches off the fan: this allows the heater to
cool down.
The fuel supply has an overflow that ensures
that the used oil flows back into the fuel tank
when the fuel pipe is blocked.
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The overflow protection switches off the fuel
pump when the burner dish overflows.
2.4Main components of the stationary
used oil fired heater (fig. 3)
ACover
BFlue connection
CBurner
DConnection to hot air fan (optional for AT
306)
EIdentification plate
FFuel filter
GSwitch box
HFuel tank
IFuel pump
JDrain cock
KFill filter
LFuel pipe
M Return line
NInspection window
O Fuel supply pipe
PFor AT 307:
Heat distributor with fan
Q For AT 307:
Maximum thermostat
2.5Main components burner AT 306
(fig. 4)
ACover combustion chamber
BCombustion chamber
CCylinder afterburner
DUpper ring
ESupport ring
FBurner dish
G Overflow protection
HKlixon
IShovel
2.6Main components burner AT 307
(fig. 6)
AExplosion window
BCombustion chamber
CHeat shield
DVaporisation section
ECombustion air ventilator
FBurner dish
G Overflow protection
HFan thermostat
When the heater is switched to automatic
mode, the fuel pump starts up
automatically when the burner dish
reaches the right temperature.
•Maximum thermostat (for AT 307):
The thermostat stops the fuel pump when
the combustion temperature gets too
high.
•Fan thermostat (for AT 307):
The thermostat starts up the hot air fan
as soon as the heater reaches the right
temperature. After switching off the
heater, the fan thermostat ensures that
the hot air fan keeps running, which cools
the heater. As soon as the heater has
cooled down, the fan thermostat switches
off the hot air fan.
2.9Accessories
•Flue with rain cap
3PREPARATIONS
3.1Removing the packaging
1. Remove packaging from the heater.
2. Remove packaging from the loose parts
in the combustion chamber.
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3.2Installation
1. Ensure that the used oil fired heater is
positioned horizontally.
2. Correctly attach the parts of the
combustion chamber, see fig. 4 and 6.
3. Open the filling cover and fill the tank with
fuel.
Caution
Only the following oil types may be
used in the stationary used oil fired
heaters:
•Automatic transmission oil
•Diesel oil
•Hydraulic oil
•Oil for household use
Note
•Install the equipment in the US
according to the following
publications of the National Fire
Protection Association:
•NFPA #30: Flammable and
Combustible
•Liquids Code
•NFPA #31: Oil Burning
Equipment
•NFPA #88A: Parking
Structures
•NFPA #88B: Repair Garages
•NFPA #211: Chimneys,
Fireplaces and Vents
•Local codes may require that the
heater is mounted at a minimum
of 8 feet (2.4 m) off the ground.
This is especially the case when
there are possible combustible or
flamable fumes in the room.
Refer to NFPA #88B.
•Install the equipment in Canada
according to the following
standard: CSA B139, installation
Code for Oil Burning Equipment.
Place the heater on a location with
respect to the following:
•Possibility of unobstructed, even
heat distribution.
•Safe and easy access for
servicing.
•Unobstructed passage for shop
vehicles and equipment.
•Proper clearances for
combustibles. Refer to the safety
section.
•Adequate combustion air per
local codes. The room must be
ventilated to provide sufficient
combustion-air. The maximum air
consumption is 12 USG/h (46 m
h)
•Proper installation of the stack.
•The structure in which the heater
is located requires the following
minimum dimensions:
•height from the point of
location of the heater: 15 feet
(4.5 m).
•length and width: 20 feet
(6 m).
•floor area: 400 square feet
2
(36 m
)
•Possibility to place the heater on
a combustible flooring.
•If the heater is installed at an
elevation, a permanent platform,
including stairs and railings, must
be provided to facilitate regular
maintenance.
4. Drain condensate from the fuel tank, see
fig. 3 (J).
5. Make sure that the hot air can flow out
freely.
6. Ensure that inflammable materials are at
a sufficient distance from the heater, see
1.4.
7. Ensure there is sufficient ventilation: the
maximum air consumption is 1625 ft
3
/
hour.
8. Make sure there is enough height above
the heater: this needs to be at least 4 ft.
3
/
AT 300-US series40.020.941 - rev. 04 - 20119
English
9. Check the floor surface: this needs to be
2
at least 388 ft
.
10. Install the flue (18 ft and a rain cap).
1 1. Make sure the rocker switch is positioned
at 0.
12. Check the supply voltage: see
identification plate.
13. Place the plug in the socket.
3.3Preparation for starting up AT 306
1. Switch control of the fuel pump to "low",
see fig. 5 (D).
2. Remove the grate, see fig. 3 (A), the
cover of the combustion chamber,
cylinder afterburner and the upper ring,
see fig. 4 (A, C and D).
3. Check whether the burner dish is clean
and cold.
4. Clean the burner dish and the floor of the
combustion chamber if necessary.
5. Pour 0.2 litre of diesel oil onto the burner
dish, see fig. 4 (F).
Warning
Never pour diesel oil onto a hot
burner dish.
The burner dish must be cool!
6. Re-position the upper ring, the
afterburner and the cylinder.
7. Form a paper pellet and light it.
8. Drop the burning pellet on the burner
dish.
9. Reposition the cover of the combustion
chamber and the grate.
3.4Preparation for starting up AT 307
1. Switch the control of the fuel pump to
"low", see fig. 5 (D).
2. Push the tank bolt up, see fig. 3 (P).
3. Open the cover of the of the combustion
chamber (fig. 6 A) and open the cover of
the heat shield ( fig. 6 (C).
4. Check whether the burner dish is clean
and cold.
5. Clean the burner dish and the floor of the
combustion chamber if necessary.
6. Pour 0.2 litre of used oil onto the burner
dish, see fig. 6 (F).
Warning
Never pour diesel oil onto a hot
burner dish.
The burner dish must be cool!
7. Form a paper pellet and light it.
8. Drop the burning pellet on the burner
dish.
9. Close the heat shield.
10. Close the heat distributor.
3.5Starting up
Warning
•Never pour diesel oil onto a hot
burner dish. The burner dish
must be cool and clean!
•Do not start the heater if the fan
still runs. The heater is cooling
down.
•Do not start the heater if excess
oil has accumulated in or near
the heater.
Caution
Do not switch on the convector
heater if there is no fuel, or if the
connected fuel tank is empty.
Caution
Only the following oil types may be
used in the stationary used oil fired
heaters:
•Automatic transmission oil
•Crankcase oil
•Diesel oil
•Hydraulic oil
•Domestic fuel oil
Automatic operation:
1. Switch the rocker switch to "2", see fig. 5
(A).
The combustion air fan starts running
(only with AT 307).
When the burner dish has reached the
right temperature, the fuel pump starts
running and the control light is on.
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2. Switch the pump regulator to "low" for the
first 20 to 30 minutes, see fig. 7 (A).
3. Switch the pump regulator to "high" when
the maximum temperature is reached,
see fig. 7 (B).
Manual operation:
1. Wait 5 minutes for the combustion
chamber to reach the right temperature.
2. Switch the rocker switch to "1", see fig. 5
(A).
The fuel pump starts running and the
control light is on.
3. Switch the pump regulator to "low" for the
first 20 to 30 minutes, see fig. 7 (A).
4. Switch the rocker switch to "2" after 20 to
30 minutes.
The pump thermostat starts working.
5. Switch the pump regulator to "high" when
the maximum temperature is reached,
see fig. 7 (B).
4USE
4.1During operation
Caution
•Do not operate the heater in hot
weather to burn oil.
•Do not burn used oils other than
generated on the premiss of the
owner, unless written
authorization is obtained from the
regulatory authority.
Hot
Do not touch the flue stack or blower
outlet! The flue stack and blower
outlet get hot during operation!
4.2Switching off
Switch off heating:
5MAINTENANCE
5.1Maintenance table
Use the table in this booklet to record
performed maintenance after each winter
Warning
Always clean the combustion
chamber before starting the heater.
season.
Warning
For all service and adjustments
contact qualified, competent and
authorized persons.
/i
Hot
Do not touch the flue and air outlet!
Wait until the flue and the air outlet
have cooled down sufficiently before
carrying out any maintenance.
DescriptionPeriod
Every
12
hours
Clean the combustion chamber.X
Drain (water of) condensation from the fuel tank, when
X
the waste oil contains water.
Weekly MonthlyAnnu-
ally
Only for the AT 307: Clean the combustion chamber
and the vaporiser with a steel brush.
AT 300-US series40.020.941 - rev. 04 - 201111
X
English
DescriptionPeriod
Every
12
hours
Clean the oil overflow pipe in the floor of the combustion chamber, see fig. 4 (G) for AT 306 and see fig. 6
(G) for AT 307.
Clean the oil supply pipe.
Replace the oil supply pipe when this is burnt out or
damaged.
Check the oil pipes for leakage.X
Clean the fuel tank, the supply filter and the fuel filter.
The fuel tank can easily be removed.
Only for the AT 307: Check the hot air fan and clean if
necessary.
Clean the flue stack valve in the T-piece, see fig. 9 (A).
The recommended draught is 1.5 mmwk (0.06” water
column).
Clean the flue stack T-piece, see "cleaning the flue
stack valve".
Weekly MonthlyAnnu-
ally
X
X
X
X
Dealer
X
Check the heater's wiring.X
Hot
Do not touch the flue stack or
combustion chamber!
Do not perform maintenance until the
flue and combustion chamber have
cooled down.
3. Clean the heater.
4. Use an oily cloth to clean the combustion
chamber, to protect the combustion
chamber against corrosion.
Warning
Do not operate the heater in hot
weather to burn oil.
5.2General
Warning
Switch off the power supply before
carrying out any repairs!
5.3Cleaning the combustion chamber
AT 306(fig. 10)
1. Remove the afterburner (A), the cylinder
(C) and the upper ring (D).
When the heater is stored long-term:
1. Switch off the heater.
2. Disconnect the power plug.
2. Clean the parts with a steel brush.
3. Remove the burner dish (E) with the hook
of the shovel (F).
4. Scrape off residues from the burner dish
with a scraper.
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English
5. Clean the inner side of the combustion
chamber (B) with the front of the shovel.
Note
•Used oils can contain heavy
metallic compounds and foreign
materials. These materials stay
as a residu when burned.
Therefore it is necessary to take
care when using, cleaning and
maintaining the heater.
•Wear protective gear when
cleaning the inside of the heater:
•Respirator for fine particles
•Rubber gloves
•Safety goggles
•Protective clothing
•Ensure that the holes in the
combustion chamber wall remain
open for combustion air supply.
6. Remove any soot pieces from the floor of
the combustion chamber.
7. Clean the combustion supply pipe with a
small brush, see fig. 3 (O).
8. Install all parts in reversed order.
The hot air heater can be restarted or shut
down.
5.4Cleaning the combustion chamber
AT 307(fig. 10)
1. Remove the heat shield (C) and the
upper ring (D).
2. Clean the heat shield and the upper ring
with a steel brush.
3. Remove the burner dish (E) with the hook
of the shovel (F).
4. Clean the burner dish with a scraper.
5. Clean the inner side of the combustion
chamber (B) and the vaporisation
chamber (fig 6.D) with the front of the
shovel.
Note
•Used oils can contain heavy
metallic compounds and foreign
materials. These materials stay
as a residu when burned.
Therefore it is necessary to take
care when using, cleaning and
maintaining the heater.
•Wear protective gear when
cleaning the inside of the heater:
•Respirator for fine particles
•Rubber gloves
•Safety goggles
•Protective clothing
•Ensure that the holes in the
combustion chamber wall remain
open for combustion air supply.
6. Remove any soot pieces from the floor of
the combustion chamber.
7. Clean the fuel supply pipe (O) with a
brush (inner diameter 0.34 inch, see fig.
3.
8. Install all parts in reversed order.
9. Install all parts in reversed order.
5.5Cleaning the flue stack valve
1. Remove the bottom cover (B) of the Tpiece (A).
2. Clean the flue from top to bottom with a
flue brush.
3. Check the connections for leakage.
4. Check the flue parts for rust.
AT 300-US series40.020.941 - rev. 04 - 201113
Caution
Rust formation indicates that
chlorine containing materials have
been burnt.
Chlorine containing materials
seriously damage the heater. This
may void your warranty.
Contact your dealer for instructions
on how to test waste oil for chlorine.
Reposition the bottom cover.
English
5.6Remove the fuel tank(fig. 8)
6FAULTS
1. Remove the fuel supply (A).
2. Take off the connection plate (B).
3. Take plug (C) from the chassis part.
4. Pull up the tank lock (D).
5. Pull the fuel tank (E) from the heater with
Warning
For all service and adjustments
contact qualified, competent and
authorized persons.
care.
6. Install the fuel tank in reversed order.
Warning
Switch off the power supply before
carrying out any repairs!
Ensure that the power is switched on,
and the fuel tank is full, before you
start troubleshooting.
6.1Troubleshooting table
/i
FaultCauseSolutionAction
The flame goes out
directly after ignition.
1The heater has no volt-
age.
Check the electric connection.
User
2There is water or sedi-
ment in the fuel tank.
3The fuel pump is not
switched on.
4The waste oil is too vis-
cous or too cold.
5The fuel supply pipe is
blocked: The fuel flows
back into the fuel tank
through the return pipe.
6The pump thermostat
has not reached the
right temperature yet.
Clean the tank and the fuel
User
filter, see fig. 3 (F).
Position the switch to "1", see
User
fig. 5 (A).
Dilute the waste oil with die-
User
sel oil.
Check the pump thermostat
Dealer
and replace if necessary.
Check the pump motor.Dealer
Check the fuel pump for dirt. Dealer
Clean the fuel supply pipe,
User
see fig. 3 (O).
Let the heater cool down.
User
Restart the heater.
Let the heater burn longer
User
with the switch on "1", see
fig. 5 (A).
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English
FaultCauseSolutionAction
The flame goes out
directly after ignition.
6The pump thermostat
has not reached the
right temperature yet.
7Only for the AT 307:
The hot air thermostat is
defective.
8Only for the AT 307:
The combustion air fan
is not functioning.
9There is insufficient sup-
ply of combustion air
Replace the pump thermostat.
Replace the hot air thermostat.
Check the motor and replace
if necessary.
Only for the AT 306:
Clean the holes in the combustion chamber wall, see
fig. 4 (B).
Only for the AT 307:
Clean the holes in the vaporiser, see fig. 6 (D).
Only for the AT 307:
Check the functioning of the
combustion air fan.
Dealer
Dealer
Dealer
User
User
Dealer
10There is no proper flue
draught.
11The flue draught is too
high or irregular.
12The flue draught is too
low.
Check whether the flue is fit-
User
ted according to the description, see "flue".
Check the flue for leakage.User
Clean the flue if necessary.User
Position a flue stack valve,
Dealer
see "flue".
Adjust the flue to the right
draught (see maintenance
table 5.1) with the counterweight on the valve(fig.9).
Check all connections in the
User
flue.
Reduce the number of
User
bends.
Heighten the flue.User
Isolate the flue outside the
User
building.
AT 300-US series40.020.941 - rev. 04 - 201115
Check the flue, see "flue".User
English
FaultCauseSolutionAction
The flame goes out
directly after ignition.
The fuel pump does
not run and the control light is off, while
the heater is preheated and the
switch is switched to
"1" or "2".
13The maximum thermo-
stat is not installed properly or defective.
14The overflow protection
is filled with waste oil.
Reset the thermostat, see fig.
3(Q).
Replace the thermostat, see
fig. 3(Q).
For AT 306:
Clean the overflow protection
dish, the burner dish and the
floor of the combustion
chamber.
For AT 307:
Clean the overflow protection
dish, the burner dish and the
floor of the vaporiser.
See faults: 3, 6, and 14.
User
Dealer
User
User
The flame is extinguished while the
fuel pump is still running.
The heater makes a
humming sound.
15There is too much diesel
oil at start up.
There is soot formation in the combustion chamber and in
the flue.
There is unburnt fuel
on the burner dish.
16There is too much diesel
oil at start up.
Record the maintenance details in table A in
the appendix of this manual.
See faults: 2, 5, 7, 9, 10 and
12.
Reduce the amount of diesel
oil.
See faults: 10, 11, and 12.
See faults: 8, 9, 10, 11 and
12.
Reduce the amount of diesel
oil.
See faults: 8, 9, 10, 11 and
12.
User
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English
7SPARE PARTS
Before use we advise you to have spare parts
in store, see table B in the appendix of this
manual.
8TECHNICAL INFORMATION
•See for technical specifications table C in
the appendix of this manual.
9INSTALLING ACCESSORIES
9.1Flue (fig. 9)
The heater has a flue stack connection.
1. Push a T-piece (A) directly over the
connection (B).
2. Push the flue pipe (C) on the T-piece.
3. Use three screws to screw the flue pipe
to the T-piece.
Caution
The flue must meet the following
requirements.
•The flue must be pointed upwards.
•The flue (or any part of it) may not be
positioned horizontally. A 45° angle is
acceptable.
•It is not allowed to lenghten the flue
connection horizontally.
•When a pipe is used under 45°, pipe
pieces of at least 1 m must be fitted in
front of and at the back of the slanting
pipe.
•The flue must stick out at least 0,5 m
above the apex of the building.
•Keep the vertical part at the back of the
heater as long as possible before leading
it outside through the wall.
4. Fit the following pipe pieces.
5. Place a cap (D) at the end of the flue.
9.2Diameter flue
/i
AT 306AT 307
5.9 inch5.9 inch
10STANDARDS AND GUIDELINES
For the standards and guidelines, go to
www.thermobile.nl.
AT 300-US series40.020.941 - rev. 04 - 201117
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1840.020.941 - rev. 04 - 2011AT 300-US series
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