21 - EN
4.4 Connecting the brine loop (terrestrial
heat collector)
The ComfoFond-L Eco uses a terrestrial heat
collector which extracts heat from the ground
and transfers this to the air that flows through the
ComfoFond-L Eco. The terrestrial heat collector
is formed by a PE pipe. The length of the pipe is
subject to local conditions, such as the type of
ground and the ground water level. Solid ground
contains more energy than loose ground. If the
pipe is below ground water level, then substantial
quantities of energy can be extracted at the base.
The pipe must be horizontally positioned in the
ground (more or less) at an ideal depth of 1,2 to 1,6
metres.
When calculating the length of the pipe, the
actual length for the calculation is the length that is
physically in the ground. The length inside the house
has no further effect on the energy that the system
can extract. The required pipe length for sandy soil
is twice as long.
The correct length of pipe can be determined
using the ComfoFond-L Eco specifications.
Zehnder has special software available for
calculating the required pipe length.
The pipe can be laid in any random form. Insulate
indoors all fluid pipes of the fluid circuit. This
prevents the formation of condensation on the
outside of the brine loop.
The preferred situation is to lay the pipe in the
ground around the house and keep the length inside
the house to a minimum. In order to
increase the efficiency, a minimum distance of 60 cm
between any loops in the pipe is advised. In order
to protect the water pipes from freezing, the pipe
must be at least 1 meter away from the water pipes
present in the ground.
Fit the boiler safety group (C) to the fluid circuit
using a T-piece. Place the boiler safety group to
the highest point of the fluid circuit, adjacent to the
exhaust side of the ComfoFond-L Eco.
Use an adaptor to connect one end of the PE pipe
to the brine connection inlet (A) of the ComfoFond-L
Eco.
Use an adaptor to connect the other end of the
PE pipe to the brine connection outlet (B) of the
ComfoFond-L Eco.
The connection of the boiler safety group is
a 1“ inner thread and the connections of the
ComfoFond-L Eco are 3/4“ outer thread.
A
B
C
An installation report has been included at the
rear of this manual which can be used to note
the details of the brine loop laid.
4.5 Electrical connections
The ComfoFond-L Eco is controlled and fed by the
ventilation unit. To do so, the temperature sensor
and circulation pump of the ComfoFond-L Eco must
be connected to the connection printed circuit board
on the ventilation unit. This connection printed circuit
board is on the top of the ventilation unit.
The temperature sensor must be connected to the
clamps that are marked with the text Tge and GND.
This sensor is not sensitive to direction. Therefore, it
does not matter which wire is connected to the Tge
or GND clamp.
The circulation pump must be connected to the
supply block on the connection printed circuit board.
As the ComfoFond-L Eco pump is not constantly
operational, this is connected to a power supply that
is switched by the ventilation unit. This power supply
is on the clamp marked with the text C. The brown
wire of the pump is therefore connected to clamp C
and the blue wire to empty clamp N.
Summary of Contents for ComfoFond-L Eco 350 L
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