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Hydro Unit
Installation Manual
Refrigerant Piping
WARNING
• THIS SYSTEM ADOPTS HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY THE OZONE LAYER.
• The characteristics of R410A refrigerant are: ease to absorb water, oxidizing membrane or oil, and its pressure is
approximately 1.6 times higher that of R22. Accompanied with the new refrigerant the oil has also been changed.
Therefore during installation work prevention of the invasion of water, dust, former refrigerant or oil is of a paramount
importance.
To prevent the charging of incorrect refrigerants into the system the service valve connection ports have also
increased in size.
• The use of R410A tools is required for correct installation of the system.
• The use of the correct pipe sizes and wall thicknesses of copper pipe work is required for the correct installation of
the system.
CAUTION
• Ensure all refrigerant pipes are protected from the invasion of dust and water.
• Ensure all pipe work connections are tightened to the required torque settings detailed in this section.
• Perform an air tight using Oxygen Free Nitrogen (OFN) only.
• Evacuate the air in the pipe work using a vacuum pump.
• Check for refrigerant gas leaks at all connections throughout the pipe work.
NOTE
The Air to Water Heat Pump system uses R410A refrigerant. It is important that copper pipes used for refrigerant
piping have the following wall thickness:
• 0.8 mm for Ø6.4 mm, Ø9.5 mm and Ø12.7 mm
• 1.0 mm for Ø15.9 mm
Refrigerant pipe sizes
Flaring
• Cut the refrigerant pipes to the correct length using a pipe cutter. Remove any burrs that may be on the pipes as
these may cause refrigerant leaks or component failure in the refrigeration cycle.
• Place the correct size flare nuts onto the pipes (use the flare nuts supplied with the Hydro Unit or use flare nuts
designed specifically for R410A refrigerant) and then flare the pipes using the correct flaring tool.
Hydro Unit Model
Gas Side (mm)
Liquid Side (mm)
8 kW Hydro Unit
Ø 15.88
Ø 9.52
11 & 14 kW Hydro Unit
Ø 15.88
Ø 9.52
13-EN
Summary of Contents for ESTIA HWS-1402XWHM3-E
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