21 - EN
4.4 Connecting the brine loop (terrestrial heat
collector)
The ComfoFond-L Q uses a terrestrial heat collector
which extracts heat from the ground and transfers
this to the air that flows through the ComfoFond-L Q.
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
from the ground.
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 Q 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 on
the highest point of the fluid circuit, adjacent to the
exhaust side of the ComfoFond-L Q.
Use an adaptor to connect one end of the PE pipe to
the brine connection inlet (A) of the ComfoFond-L Q.
Use an adaptor to connect the other end of the
PE pipe to the brine connection outlet (B) of the
ComfoFond-L Q.
The connection of the boiler safety group is
a 1“ inner thread and the connections of the
ComfoFond-L Q are 3/4“ outer thread.
A
B
C
An installation report has been included at the
back of this manual which can be used to note
the details of the brine loop laid.
4.5 Electrical connections
The ComfoFond-L Q is controlled and fed by the
ventilation unit. To do so, the temperature sensor
and circulation pump of the ComfoFond-L Q must
be connected to the Option Box of the ventilation
unit. The Option Box is installed near the ventilation
system.
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 Q 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 230V
P/V CFL/EWT. The brown wire of the pump must be
connected to the clamp L. The blue wire of the pump
must be connected to the clamp N. The green/yellow
wire of the pump must be connected to the clamp PE.
Summary of Contents for ComfoFond-L Q ST
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