Getting Started; Troubleshooting; Technical Data; Questions And Answers - Conrad OWL-2 Bedienungsanleitung

Getting started

The pre-heater may only be operated on a Schuko socket with GFCI (earth leakage circuit
breaker) (30mA) connected upstream. For more information you may contact a certifi ed
electrician in your vicinity.
Normally, an earth leakage circuit breaker is integrated in the standard domestic installa-
tion.
Observe the safety instructions for the handling of cooling agents.
The fi rst two warm-up circles after the start-up must be performed under supervision.
The device must not be operated without water or with frozen cooling water.
Operating the motor pre-heater is prohibited if persons are inside the vehicle.
Prior to each use of the motor pre-heater, make sure there are no leakages and there is
no humidity in the electric connection plug.
If the motor pre-heater remains installed in the vehicle throughout the whole year and
is not used during summer, it is required to perform a warm-up phase three times per
month, in order to avoid deposits in the device.
Do not touch the appliance when in use. Remove the mains plug before working on the
device.
The operation of the motor pre-heater is only allowed with the original mains cable con-
tained in the delivery.
• Fill in the cooling agent and pay attention if there are potential leakages.
• Ventilation work might be required. In this regard, contact the manufacturer of the vehicle.
• Mix the coolant as described on the package or as stipulated by the manufacturer if it is to be replaced.
• Fill up the cooling agent compensation tank so much that the level of the cooling agent is between the
minimum and maximum marking. Wait a few minutes and screw down the lid of the compensation tank.
• Start the engine and set the indoor heater/air conditioning to maximum heat.
• Let the motor heat up to lukewarm temperature. Pay attention that everything is leak-proof and the cooling
water level does not go down below the minimum. If required, turn the engine off, refi ll the cooling agent
and repeat the previous steps.
☞
Caution, the compensation tank may be under pressure! Risk of scalding!
• If the cooling water level remains constant, let the motor run until it reaches the operating temperature. If
you notice any leakages turn the engine off immediately, let it cool down and seal the leakage.
• Once the motor has reached the operating temperature, turn it off and let it cool down.
• Check the pre-heater for leak tightness; no coolant must leak at any place.
• If everything is leak-proof, the pre-heater can be put into operation by connecting the connection cable to
a mains socket.
☞
The indoor heater must be set to maximum "Warm"!
If you hear any noises, except for a "low buzzing" during the operation of the pre-heater, there
is air in the cooling circuit. This may destroy the pump unit. In this case, remove the air from the
cooling system again.
• If all conditions are met, you can operate the pre-heater.
☞
Always make sure you set the indoor heater to "warm" before operating the pre-heater.
Function of and securing the motor pre-heater
The motor pre-heater heats up the motor or the coolant in intervals of approx. 15 minutes.
Once the preset temperature is reached, the device switches off automatically. If the temperature of the
cooling water then drops to a value of approx. 10-15°C below the pre-heating temperature, the device turns
on automatically and starts the cycle again.
If the pump is blocked, e.g. through soiling, the device turns off automatically. If the device fails to switch off or
the air is not functioning in the cooling water circuit, the device turns off automatically at 145°C by destroying
the integrated safety fuse. After that, the pre-heater must not be used any longer.
In the event of residual currents or humidity in the connection system the RCD-switch connected upstream
turns off automatically.

Questions and answers

Which vehicle engines is the motor pre-heater suitable for?
The motor pre-heater is suitable for all liquid-cooled combustion engines. For motors with a large volume
(e.g. trucks, construction machines or transporters) the heater is less suited due to its heating and pump
capacity. The same applies to systems where the motor and heat radiator are located from each other in a
distance of more than 80 cm. If the heater is to be used for such motors/systems, we recommend the use
of 2 heaters in parallel operation.
Can the pre-heater be used for LPG (liquefi ed petroleum gas) / vegetable oil fuel - vehicles?
Vehicles with bivalent fuel (LPG/fuel) are always started up with fuel in the cold-start. A swapping to LPG
is only possible after the motor has given off enough heat to the cooling agent. The reason is that the LPG
vaporiser requires heat in order not to freeze. During the operation in short distances the vehicle thus is
operated by fuel and not by gas. The pre-heater supplies the LPG vaporiser with warm coolant too, and
the vehicle therefore can be switched faster to operation by gas. A similar function is available for vehicles
operated by vegetable oil fuel.
Is it possible to use the pre-heater as indoor heater?
The primary goal is to preheat the motor and thus reduce wear, emissions and fuel consumption. Depending
on the assembly type (return fl ow of the heat radiator), the indoor heater is also supplied with warm coolant.
However, the heat emission in the interior is low since here only
convection heat is released. Only after the start of the engine and with switched-on ventilation system, useful
heat will be available. However, turning on the ventilation system is possible to heat up the vehicle's interior.
What is the difference to other pre-heaters?
Most pre-heaters work according to the convection principle. These heaters are directly inserted in the motor
or the freeze plugs (partly, several heaters are even inserted at the same time). Each motor type requires
specifi c heaters. A heating up of the motor is only possible individually and in intervals, and the heating-up
times are up to three hours. This motor pre-heater is a universal pump pre-heater with the smallest design,
which also fi ts into the most modern and narrow engine compartments. By means of the integrated pump the
coolant is continuously transported and circulated. Thus, the generated heat is distributed evenly and quickly.
Thereby, higher temperatures can be generated with the same capacity than with pre-heaters that are not
operated by pumps. The heating up times are reduced considerably.
Trouble-shooting
The heater does not start:
• Connection to the mains is interrupted.
• Internal safety fuse has been triggered as a consequence of over-heating by air in the system.
The heater does only start briefl y:
• Pump is overloaded, circulation is blocked, heater regulator is closed, pump height was exceeded. Coolant
is not or not suffi ciently circulated.
• Air in the heater, thermostat switch interrupts the power supply.
The pump does not start up, however, the device gets hot:
• Pump is blocked, polluted or outdated cooling agent, deposits on the pump rotor. In order to avoid depo-
sits, the heater should be turned on at least 2 to 3 times per month.
The RCD switch is activated:
• Internal safety fuse has been triggered.
• Humidity in the connection plug, hose connections/sealing might be leaky.
Maintenance and Care
Always separate the pre-heater from the power supply before cleaning it. Always let the
pre-heater dry well before you put it into operation again.
The outside of the pre-heater should only be cleaned with moist cloth or sponge.
Never use caustic cleaning agents or chemical solutions as the surface of the case could be damaged.
Disposal
Please dispose of the product, when it is no longer of use, according to the current statutory
requirements.

Technical Data

Operating voltage ........................220-240V~/50Hz
Power consumption .....................1240 W
Pump capacity .............................max. 5-7l/min
Pump height ................................max. 50cm
Hose connections ........................suitable for 16-20mm cooling water hoses
Switching-off temperature ............Model OWL-1: 75°C
Model OWL-2: 60°C
Safety fuse at ...............................145°C
Dimensions ..................................110 x 60 x 60mm
Weight .........................................380g
These operating instructions are a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1,
D-92240 Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfi lming,
or the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in
technology and equipment reserved.
© Copyright 2012 by Conrad Electronic SE.