Atlantic 024122 - Hydraulic Connection; Connecting the Hydraulic Unit to the Heating Circuit

4.1 Connecting the hydraulic unit
to the heating circuit
4.1.1 Flushing the installation
Before connecting the hydraulic unit to the installation,
rinse out the heating system correctly to eliminate
any particles that may a󰀨ect the appliance's correct
operation.
Do not use solvents or aromatic hydrocarbons (petrol,
para󰀩n, etc.).
In the case of an old installation, provide a su󰀩ciently
large decanting pot with a drain on the return from the
boiler and at the lowest point in the system in order to
collect and remove any impurities.
Add an alkaline product and a dispersant to the water.
Flush the installation several times before proceeding
to the nal lling.
4.1.2 Connections
The heating circulation pump is built into the hydraulic
unit.
Connect the central heating pipes to the hydraulic unit
correctly according to the direction of circulation.
The pipe between the hydraulic unit and the heat collector
must be at least one inch in diameter (26x34 mm).
Calculate the diameter of the pipes based on ow rates
and lengths of the hydraulic systems.
Tightening torque: 15 to 35 Nm.
Use union connectors to make it easier to remove the
hydraulic unit.
Try to use connection hoses to avoid transmitting noise
and vibrations to the building.
Connect the drains from the drain valve and the safety
valve to the main sewer system.
Verify that the expansion system is correctly connected.
Check the expansion vessel pressure (pre-inated to
1 bar) and the safety valve is calibrated.
The ow rate of the installation must be at least equal to
the minimum value mentioned in the specications table
(section 1.4, page 7). The installation of a regulator
(other than those included in our congurations) which
reduces or stops the ow through the hydraulic unit is
prohibited.
4 Hydraulic connections
Installation and Operating Manual "1821- EN"
Alféa Extensa Duo A.I. Heat Pump
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