Eberspächer Hydronic D4 Installation Manual - page 24
Commissioning the system
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Warranty information
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Filling the coolant system
Before filling the coolant system ensure that all pipe and
hose connections are secure.
Fill the system with an anti-freeze mixture of at least
40% to prevent corrosion and coolant freezing. The anti-
freeze mixture concentration will vary and is dependant
upon climatic conditions where the heater is to be
operated and must be altered to suit accordingly.
Before running the heating system, pressure test to 1 bar
/ 14.5 psi using an appropriate pressure tester, to check
for leaks.
In the event of coolant becoming frozen or lost, the
heater must not be operated.
Purging air from the system
Before operating the heater, as much air as possible
should be vented from the system. This is best achieved
by systematically venting each matrix/radiator in turn,
starting with the lowest level vent first.
Once this has been achieved the heater can be started
after checking the following.
• Ensure all water connections are secure and leak
free.
• Check that the batteries are fully charged.
• Check there is sufficient fuel in the fuel tank.
• Check the power supply for correct polarity.
• Now switch on your heater.
!
Danger!
Risk of injury and burns!
• Potential scalding or burns can result from venting
air from the system if the Hydronic is running and the
water is hot.
Please Note!
Combustion may not be established when the heater is
first operated. Several attempts may be required to start
the heater. This is due to air being present in the heater
fuel lines that needs to be purged by the fuel-metering
pump. Please also be aware that any air present in the
system when the heater is in operation may cause the
heater to shutdown prematurely. Always allow the system
to cool down before commencing further venting. In
some cases leaving the system to vent naturally through
the expansion tank overnight is the best option.
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