Hydro Unit
Installation Manual
– 9 –
17-EN
18-EN
The back side of the Hydro Unit can be highly heated,
therefore, the installing surface must be heat-resistant.
Install the Hydro Unit so that its tilting angle falls within
the range below.
■ Refrigerant piping
WARNING
• THIS SYSTEM ADOPTS HFC REFRIGERANT (R32)
WHICH DOES NOT DESTROY THE OZONE LAYER.
• 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 R32 or 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 test 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 R32
refrigerant. It is important that copper pipes used for
refrigerant piping have the following wall thickness:
• 0.8 mm for Ø6.4 mm and Ø12.7 mm
• 1.0 mm for Ø15.9 mm
Secure the Hydro Unit with
plain washers and nuts.
▼Fig.7-02 ▼Fig.7-03
▼Fig.7-04 ▼Fig.7-05
± 1°
Refrigeration pipe
The length and height of the refrigeration pipe must be
within the following values.
▼Fig.7-06
Hydro Unit
Model
H:Max L:Max L:Min
HWT-60
HWT-110
±30 m
(above or below)
30 m 5 m
HWT-140
±25 m
(above or below)
25 m 5 m
Refrigerant pipe sizes
Hydro Unit Model Gas Side (mm)
Liquid Side
(mm)
HWT-60 Ø 12.7 Ø 6.35
HWT-110,140 Ø 15.88 Ø 6.35
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 R32 refrigerant)
and then flare the pipes using the correct flaring tool.
Outdoor Unit
H
L
Gas line
Liquid line
Tightening
• Connect the refrigerant pipes, from the Outdoor Unit,
to the Hydro Unit as shown below.
▼Fig.7-07
• Align the flare connection on each pipe with the
corresponding outlet connection on the Hydro Unit.
Tighten the flare nuts, using fingers, to secure the
pipes in place.
• Tighten the flare nuts, using a torque wrench, to the
tightening torques shown below:
Outer Ø of Copper Pipe
(mm)
Tightening Torque (N/m)
Ø 6.35 14 to 18
Ø 12.7 50 to 62
Ø 15.88 63 to 77
• To prevent damage, to the refrigerant pipes, use two
spanners to tighten the flare nut connections to the
required torque.
■ Water pipe
WARNING
• Install water pipes according to the regulations of
respective countries.
• Install water pipes in a freeze-free place.
• Make sure that water pipes have sufficient pressure
resistance.
The setting value of the overpressure preventive valve
is 0.43 MPa (4.3 bar).
CAUTION
• Do not use zinc plated water pipes. When steel pipes
are used, insulate both ends of the pipes.
• The water to be used must meet the water quality
standard specified in EN directive 98/83 EC.
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