Eberspächer hydronic 16 Troubleshooting And Repair Manual - page 10
10
Options
• When the “Lower Temperature” option is selected, the
adjustable “ON / OFF” temperatures drop by approx. 8K.
For information regarding the “ON / OFF” switch for
reducing the temperature, see the wiring diagrams on
pages 48 to 50.
• The water pump can also be operated independently
of the HYDRONIC if controlled appropriately.
For information regarding the additional “ON / OFF” switch
for separate control of the water pump, see the wiring
diagrams on pages 48 to 50.
• The vehicle blower is controlled by being switched on and
off at the following temperatures.
- Water temperature >55°C --> vehicle blower “ON”
- Water temperature <50°C --> vehicle blower “OFF”
For further information on control of the vehicle blower, see
wiring diagrams on pages 48 to 50.
Switching off the HYDRONIC
Once the HYDRONIC has been switched off, the fuel solenoid
valve closes and at the same moment the 3-minute delayed
shutoff commences.
Following termination of the delayed shutoff, the HYDRONIC is
automatically switched off.
Please note!
• The fuel continues to circulate until the heater is switched
off, including during the delayed shutoff period.
Function description
Switching on the HYDRONIC
When the HYDRONIC is switched on, a component test
lasting 3 seconds is carried out, following which the water
pump is started up.
Note:
If the water temperature is <5°C, the nozzle holder heater
is switched on for 60 seconds, during which start-up of the
burner is deferred.
Burner start-up
The electric motor starts up and drives the combustion air
blower impeller and the fuel pump.
After approx. 10 seconds the ignition is switched on, following
which the fuel solenoid valve opens.
Within this 10 second period a rotary check of the electric
motor is performed.
In the combustion chamber the combination of fuel and com-
bustion air forms a combustible mixture.
The mixture is ignited by a high-voltage ignition spark.
The flame monitor detects the flicker frequency of the flame
and switches off the ignition spark generator.
The hot flammable gases flow through the heat exchanger and
conduct the heat to the heating medium.
Please note!
• The heater works as a function of the heat requirement.
Hence switching on and off times of the burner are of
different lengths.
• The water pump continues to operate the whole time that
the heater is on, as well as in the controlled intervals and
during the delayed shutoff.
Construction of the HYDRONIC
The HYDRONIC consists of a heat exchanger and a
removable burner.
The heat exchanger is a combustion chamber, consisting of a
flame pipe with integrated mixer.
If required, the flame pipe can be removed from the heat
exchanger.
The control unit and electric motor are attached under the
burner hood on the burner flange.
The fuel pump forms an integral part of the burner casing.
To operate the HYDRONIC, the following additional equipment
is required:
• water pump
• parts for connecting to the water circulation system
• additional equipment for the fuel supply
• additional equipment for the exhaust gas piping
• control element
For catalogue numbers of the additional equipment, see
pages 8 and 9.
For other additional equipment, see Additional Equipment
Catalogue.
2 / Product Information
Special features of the HYDRONIC
• If the water flow rate is insufficient, the water outlet
temperature is limited by early correction.
• The temperature rise of the heating medium is monitored
by time.
If the temperature rises too quickly (because the water flow
rate is insufficient), the heater will automatically switch itself
off and the delayed shutoff will commence, following which
the cycle starts up again.
• The values of the temperature sensor and the safety
thermal cutout sensor are continuously compared, resulting
in improved safety since, if the difference in the values is
too great (because the water flow rate is insufficient), a fault
shutdown will occur.
Visit www.butlertechnik.com for more technical information and downloads.
www.butlertechnik.com