Installation instructions S-HR series page 10
4.3 Underfloor heating systems
When connecting or using an underfloor heating system
fitted with plastic pipes one has to take into account that
the plastic pipes used meet the DIN 4726/4729
standard. It is stated in this standard that the pipes may
not have a higher oxygen transmittance than 0.1 g/m³.d
at 40°C. If the system does not meet this DIN standard,
then the underfloor heating section will have to be
separated from the central heating unit by means of a
plate heat exchanger.
In case of non-compliance with the
regulations concerning plastic underfloor
heating pipes, no claims can be made against
the guarantee conditions.
4.4 Gas pipe
The unit pipe is equipped with a female thread, into
which the tail piece of the gas valve can be screwed.
The Gas Safety (Installation and Use) Regulations
1994:
It is the law that all gas appliances are installed by
CORGI registered contractors in accordance with the
above regulations. Failure to install appliances correctly
could lead to prosecution. It is in your own interest, and
that of safety, to ensure that the law is complied with.
For good operation of the unit it is necessary that the
pre-pressure of the unit is higher than 20 mbar.
Make sure that the gas pipe work does not
contain dirt, particularly with new pipes.
4.5 Hot water supply (S-HR-T)
The unit pipes can be connected to the installation by
means of compression fittings. The unit is provided with
an inlet combination and safety valve set at 8 bar.
Together with the condensation discharge and the
discharge of the central heating safety valve (3 bar) this
is connected to one waste connection pipe.
A flow regulation valve is fitted in the cold water pipe.
The flow regulation valve provides that a quantity of
water is supplied which has a guaranteed outlet
temperature of 60°C (assuming a cold water
temperature of 10°C). The quantity of water is virtually
unaffected by the water pressure. With a water pressure
lower than 1.5 bar it is advisable to remove the inside
mechanism of the flow regulation valve. Connecting of
the drinking water installation should be done according
to the water BYE-laws.
4.6 Condensation discharge pipe
The collective condensation discharge pipe should be
connected to the waste by means of an open
connection. By this means the possibility of sewer
gases ending up in the unit is prevented. The waste
connection should have a minimum diameter of 25 mm.
The following components are connected to the
collective condensation discharge pipe:
- Condensation discharge;
- Safety valves;
- Inlet combination (S-HR-T)
Discharging of the condensation water to the
precipitation discharge is not permitted in
view of the danger of it freezing.
Before putting the unit into operation fill the
trap with 300 ml of water.
inlet combination and safety valve
figure 8
