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Installation 

HydroLink™ units should be installed in 

accordance with the diagrams shown in 

this instruction manual, ensuring the correct 

connection of the flow and return pipework 

and the main and branch connections.  
HydroLink™ units can also be installed upside 

down, as long as the connection logic shown is 

followed.

The 1/2" NPT female connections must only be 

used for connecting an air vent valve and drain 

valve, and not for connecting branch circuits.

The air vent and drain valve are included in 
shipment but not connected to the Hydrolink™. 

Use a liquid anaerobic thread sealant to ensure 

water tight connections.

Installation and Insulation Assembly

Procedures – 

Models 2+2

and 3+1

HydroLink™
models
2+2 and 3+1
are supplied
with angle wall-
mounting brackets, which allow the front-to-
back positioning to be adjusted.

After bracket mounting and leak-testing, 
the pre-formed insulation shell should be 
attached as described in points 1 and 2 
below.

1.

 Remove the protection film from 

the surface adhesive and assemble.

 

2.

 If the HydroLink™ unit is to be used with

chilled water, spread a thin layer of sealant
around the outer edges of the pre-formed
insulation, wait until the solvent has
evaporated (about 10 minutes) and then
assemble. 

0,25

0,5

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CALEFFI

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0,25

0,5

0,75

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WATCH

CALEFFI

0,25

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1,5

1,75

2,0

2,25

20

3

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