Product Manual

3.16 Fuel quality for diesel heaters
The heater runs on standard commercial grade diesel fuel to EN 590
with max. 30 % biodiesel content (FAME). In case of storage periods
longer than 30 days it is advisable to use FAME-free products, as
ageing effects can have a negative effect on the fuel, especially
regarding its flow properties and filterability.
During the winter months the diesel fuel is adapted to the low
temperatures of 0°C to -20°C. This means that problems can only
arise if extreme drops in temperature occur – as is the case for
the vehicle engine too – please refer to the vehicle manufacturer's
instructions.
3.17 Heating oil operation with additional tank
In special cases and at outside temperatures above 0°C the heater
can also be run on EL heating oil according to DIN 51603 (from an
additional tank).
If the heater is run from a separate tank, please comply with the
following rules:

at outside temperatures above 0 °C: use diesel fuel to EN 590 or
EL heating oil to DIN 51603;

at outside temperatures of 0°C to -20°C:
use winter diesel fuel to EN 590;
 at outside temperatures of -20°C to -40°C: use Arctic diesel or
polar diesel.
Note
 It is not permitted to add used oil!
 Following operation with winter or cold diesel, the fuel lines and
the metering pump must be filled with the standard diesel fuel
after letting the heater run for 15 minutes!
 Heaters B 4 E and B 5 E are not approved for operation with
biodiesel to DIN 14214.
4 Operation and Function
4.1 Operating instructions
The heater is operated by a control unit. Detailed documentation / CD
for operation is enclosed with the control unit.
Note
The service company or installation company gives the
documentation / CD to the end user.
4.1.1 Initial commissioning of the heater
Note
Slight smoke and/or odours can develop during the initial
commissioning of the heater. This is completely normal during the
first minutes of operation and is not an indication of a malfunction.
The following points are to be checked by the company installing the
heater during initial commissioning.

Following installation of the heater, vent the cooling water circuit
and the entire fuel supply system carefully. Comply with the
instructions issued by the vehicle manufacturer.

Open the coolant circuit before the trial run (set the temperature
control to “WARM”).
 During trial running of the heater, check all water and fuel
connections for leaks and tight fit.
 If faults occur while the heater is running, use a diagnostic unit to
determine and correct the cause of the fault.
4.1.2 Safety test after the summer break
 After a lengthy stoppage (summer months), check all components
for secure fit (tighten screws where necessary).
 Carry out a visual check of the fuel system for leaks.
4.1.3 Before switching on
Before switching on or pre-programming heating mode, switch
the vehicle's heating controller to “HOT” (maximum setting) and
the fan to “slow level” (low electricity consumption). In vehicles
with automatic heating, before switching off the ignition, switch
the heating control to “MAX” and the required damper position to
“OPEN”.
4.1.4 Parking ventilation
Parking / cab ventilation means: possible activation of the vehicle
fan directly via the control unit or – even more useful – via the radio
remote control by bypassing heating mode, in order to ventilate the
often over-heated vehicle interior in the summer with fresh air just
before driving away.
25.2933.90.0001.0A EN | 06.2018 29
Technical Description | Hydronic S3 Economy