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installer
HRC
70
35kW HIGH TEMPERATURE HEAT PUMP
manual
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8
9
3.2.3 - Pressure-relief valves
The Heat Pump and the Pilot are both equipped with pressure-
relief valves.
The pressure-relief valve on the Heat Pump sets the maximum
acceptable pressure in the installation (2.5 bars when hot). The
maximum service pressure on the Heat Pump must, consequently
be lower than 2.5 bars.
Example : If the Heat Pump is positioned 5m below the Pilot, the
pressure reading on the Pilot would be 0.5 bars less than
the real pressure of the water in the Heat Pump. In this case,
the maximum service pressure for the Pilot would be 2 bars.
Therefore it would be advisable to fill the heating circuit at
an intermediary pressure (between 1 and 1.5 bars).
In case of operating with a back-up boiler, these pressure-relief
valves
MUST
be installed in addition to the ones which the boiler
is already equipped with (set at 3 bars).
The connections and the evacuation conduits for the pressure-
relief valves must be made from materials which are resistant to
high temperatures and corrosion.
3.2.4.1 - Backflow prevention device
French law (articles 16.7 and 16.8 of the ‘‘Règlement Sanitaire
Départemental’’) stipulates that a type CB backflow prevention
device must be installed. This device must be at different, non-
regulated pressure zones, in accordance with the NF P 43-011
standard. This is also an obligatory requirement in other countries,
which makes it important to verify the current laws and standards
in effect in the country of installation and ensure that your
installation is in compliance with them. The backflow prevention
device is designed to prevent incoming heating water from
entering the drinking water circuit. It must be connected to the
mains drainage system.
3.2.4 - Heat Pump water inlet filter (supplied)
A 1’’ valve with a built-in 500µm filter must be installed on the water
inlet piping on the Heat Pump:
• Respect the direction of flow on the filter (arrow on the
valve)
• Install the 1’’ valve with a filter on the inside of the
building and ensure it is thermally insulated.
Before making any hydraulic connections to
the Heat Pump, it is necessary to desludge
and rinse the installation.
Clean the filter several times as soon as the Heat
Pump circulator pump has been activated (make
sure to switch off the Heat Pump circulator
pump before cleaning).
• Clean the filter at least once per year.
3.2.4.2 - Purging the heating circuit(s)
All necessary measures must be taken to ensure that the
installation can be continuously degassed. Automatic air purging
valves should be placed at each high point of the installation, and
manual air purging valves should be installed on each radiator.
3.2.4.3 - Insulating the piping
Insulants must conform to the DTU 67.1 standard, or the current
regulations in effect in the country of installation.
All visible piping and accessories (circulator pump, expansion
vessel, valves, etc...) must be either insulated or placed in
insulated sleeves.
Remember to insulate the distribution manifolds and the inlet
and outlet flow pipes to the underfloor heating circuit.
Remember to insulate the piping which connects the Heat Pump
to the Pilot.
3.2.4.4 - Expansion vessel
An expansion vessel needs to be installed onto the heating circuit.
See Appendix A4 for information on proper sizing of the
expansion vessel.
3.2.4.5 - Frost protection and water treatment
See the recommendation in Annexes A3 and A5.
Heat Pump model
35kW
Minimum nominal flow rate
3500 L/h
Maximum pressure
2.5 bars
Minimum Ø of piping
if distance* between HP and pilot < 15m
36 mm / 38 mm
If distance* between HP and pilot < 25m
42 mm / 44 mm
If distance* between HP and pilot < 50m
46 mm / 48 mm
* distance consists of both inlet and outlet
