Operating instructions

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Pre-Start Procedures
The temperature can be lowered by connecting the positive
cable (+) to connector S2, terminal C3 of the heater (see circuit
diagrams).
With the switching off the heater starts the after-run of
180 sec. During the after-run the first glow plug is switched
on after 90 seconds for a period of 45 seconds,
then the second glow plug is switched on until the end
of the after-run.
The heater is equipped with the following control and safety
devices.
• If the heater does not ignite within 74 seconds after the fuel
starts to pump, the start is repeated.
If the heater still does not ignite after another 65 seconds of
fuel being pumped, the heater is automatically shut down.
After an unacceptable number of failed start attempts, the
control box is locked.*
• If the flame goes off by itself during operation, the heater is
restarted.
If the heater does not ignite within 74 seconds after the fuel
starts to pump again, the heater is automatically shut down.
The shutdown on faults can be cancelled by briefly switching
off and on again.
• In the case of overheating (e.g. water shortage, poorly venti-
lated cooling water circuit), the overheating sensor triggers,
the fuel feed is interrupted and the heater is automatically
shut down.
Once the cause of the overheating has been eliminated, the
heater can be re-started by switching it off and on again
(provided that the heater has cooled down sufficiently, cooling
water temperature < 70 °C).
After the heater has been shut down due to overheating an
unacceptable number of times, the control box is locked.*
* The ECU can be unlocked and the fault can be displayed
with:
• EasyStart.
• Diagnostics Unit.
• EDiTH diagnostics software.
For operation and fault list, please refer to the enclosed
operating instructions or these troubleshooting and repair
instructions.
• If the lower or upper voltage limit is reached, the heater
will shut down.
• The heater does not start up if the electric cable to the
metering pump is not connected.
• If one of the two glow plugs is defective, the start sequence
takes place with one glow plug only .
• The speed of the blower motor is continuously monitored.
If the blower motor does not start up, if it is blocked or if the
speed differs by > 12.5 % of the desired speed, the heater
will automatically shut down after 60 sec.
• The function of the water pump is continuously monitored.
Upon completion of installation prepare the heater as follows:
• Check all fuel, electrical and plumbing connections.
• Refill the engine coolant.
• Bleed air from the coolant system by running the engine and
refilling the antifreeze as needed. Resecure heater hose.
• Run engine to further bleed the system
• Top up engine coolant.
Once switched on, the following sequence occurs:
• Control unit does a systems check (flame sensor, tempera
ture, and various other control unit checks).
• Water pump starts circulating coolant fluid.
• Combustion air blower starts.
• Glow pin begins to preheat 20-30 secs.
• After about 20-30 seconds the Fuel Metering Pump starts deli-
vering fuel and the combustion air blower ramps up gradually.
• Once ignition takes place the flame sensor alerts the control
unit and the control unit shuts off the glow pin (ignition time:
1.5 - 2 minutes).
At the initial start the heater is operated with the “POWER” stage
until the water temperature exceeds the “POWER” / “HIGH”
changeover threshold.
HYDRONIC M8 / M10
Then, depending on the heat requirement, the heater switches to
the
“HIGH – MEDIUM – LOW – STAND BY” stages.
If the heating requirement in the “LOW” stage is so small that the
cooling water temperature reaches 85 °C, the heater switches
from “LOW” to “STAND BY”.
HYDRONC M12
Then, depending on the heat requirement, the heater switches to
the
“HIGH – MEDIUM 1 / MEDIUM 2 / MEDIUM 3 – LOW –
STAND BY” stages.
If the heating requirement in the “LOW” stage is so small that the
cooling water temperature reaches 85 °C, the heater switches
from “LOW” to “STAND BY”.
This is followed by the after-run with additional after glowing of the
glow plugs (like when heater is switched off).
After the cooling water has cooled to approx. 70 °C the
HYDRONIC M8 / M10 heater starts in the “MEDIUM” stage, the
HYDRONC M12 heater in the “MEDIUM 1” stage.
If the cooling water temperature reaches approx. 55 °C the
temperature sensor switches the vehicle fan on.
Temperature drop only becomes active while the vehicle is runing
and if the heater is switched on. The control stages are reached
earlier and the heater‘s control action is adjusted to the lower heat
requirement.
Start Up
Heating Mode
Temperature Drop
Safety Equipment
The heater must be switched off while any
fuel tank on the vehicle is being filled.
The heater must not be operated in
garages or enclosed areas.
Warning:
Switching Off
Note: If the heater fails to start the first time it will automa-
tically attempt a second start. If unsuccessful the heater
will shut down completely.
Note: On initial start up the heater may require several
star
t attempts to self prime the fuel system.