gledhill THP180 sol, Инструкции по проектированию, установке и обслуживанию

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Page 9
SY
STEM DESIGN
DESIGN
Plastic Pipe Work
All the recommendations with regard to the heating systems in this manual are
generally based on BS/EN Standard copper pipework and fi ttings. However plastic
pipework system can be used in place of copper as long as:
• The chosen system is recommended for use in domestic heating systems
by the manufacturers and it is installed fully in accordance with their
recommendations.
• The design criterion of the plastic system is at least equivalent to the use of BS/EN
Standard copper pipework and fi ttings.
• The barrier pipework for these systems is recommended.
Use In Hard Water Areas - All Models
The patented design of the heat exchange module is such that the turbulence through
the coil slows down the formation of scale in even the hardest water conditions, at
normal operating pressures.
Scale Protection
The Building Regulations approved document L1A and L1B and the requirements
set out in the ‘Domestic Heating Compliance Guide’ specify that “where the mains
water hardness exceed 200ppm provision should be made to treat the feed water to
the water heaters and the hot water circuit of combination boilers to reduce rate of
accumulation of lime scale”.
To comply with this requirement, the hardness of the mains water should be checked
by the installer and if necessary a suitable in-line scale inhibitor device should be
specifi ed for hardness levels between 200 and 300ppm (mg/l).
It is important that where the supply to the Torrent is in 22mm the in-line scale inhibitor
is also 22mm. In practice servicing is not normally required but in hard water areas
requirements can be considered similar to those needed for instantaneous or ‘combi’
appliances.
The installation of the scale inhibitor should be in accordance with the manufacturers
instructions and with the Water Byelaws.
Where the water hardness level is 300ppm (mg/l) and above, the optional phosphate
type inhibitor should be specifi ed and fi tted at a suitable point in the cold water
supply to the appliance.
Water Treatment And Frost Protection
Although the Torrent HP has no special water treatment requirements, the radiators
and other parts of the circuit will require the application of a scale and corrosion
inhibitor. The heat pump and the external connecting pipework will also require
protection against freezing. For this reason, a combined antifreeze and inhibitor
product such as Fernox Alphi 11 must be used (see Fernox Alphi 11 datasheet in
Appendix B).
The volumes and concentration should be calculated in accordance with the
manufacturers instructions and when calculating the system volume i.e. the water
content, the volume of the Torrent HP should be taken into account (see table ).
In all Torrent HP models, treating the primary water will not contaminate the domestic
hot water.