Baxi Solarflo Installation Manual page 15

Fig. 12
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Solarflo - Solar Thermal Domestic Hot Water System
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9.0 Installation of hydraulic station
9.3
See Fig. 12
1 Solar cylinder
2 Collector temperature sensor lead
3 Solar primary flow (from collector)
4 Solar collector panel(s)
5 Solar primary return (to collector)
6 Solar primary flow (to cylinder)
7 Solar primary return (from cylinder)
8 Solar differential temperature controller
9 Cylinder temperature sensor lead
9.4 Pipework installation - general
The collectors, the hydraulic station and the solar cylinder
(Fig. 12, Item 1) must be connected with hard soldered
copper pipes, compression fittings or baxi multifit
accessory flexible steel tube and insulation 5122238.
N.B. Plastic pipes MUST NOT be used.
Connections supplied are suitable for pipe diameters of
22mm. However for short pipe runs (up to 10m) the use
of 15mm diameter pipe is acceptable.
In solar heating systems, use only pipes and fittings made
from copper, brass, bronze brass or stainless steel.
Compression fittings only must be used.
All connections and joints must be resistant to
temperatures of up to 150°C and resistant to glycol.
The height difference between the highest point in the
pipework (collector) and the hydraulic station may be a
maximum of 15m (this is called the 'static height'). If the
static height is greater than 15m a larger expansion vessel
may be required.
If any pipe sealants are used these should be resistant to
glycol and be able to withstand temperatures of up to
150°C.
9.4.1 Earthing pipework
All solar primary pipework between the solar collectors,
hydraulic station and solar cylinder must be earth bonded
to avoid electrical potential differences.This work must
be carried out by a qualified electrician.
Fit earthing clamps to the solar primary flow and return
pipes and connect the earth clamps to the earthing system
of the property using an earth bonding cable of min. 6mm
diameter.
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