6. Secondary circuit installation
6.1. Connections – Secondary circuit connections MUST be made to the cylinder in accordance with
Figs 1a and 1b. A drain cock (not supplied) should be fitted in the position shown in Figs 1a and 1b
to facilitate draining of the cylinder.
6.2. Cold water supply – Where possible, for best results, the cylinder should be fed by an uninterrupted
22mm supply pipe into the pressure reducing valve (PRV) with a supply pressure of between 3 and
12 bar maximum. In the UK, supply pressures this high are not always available. However the system
will still work satisfactorily with pressures below this. The cylinder should not be used on any system
with a supply pressure below 1 bar and a flow rate of less than 10 Litres per minute.
6.3. Temperature and pressure relief valve – The temperature and pressure relief valve (TPV) is supplied
factory fitted to the cylinder. The TPV must not be removed from the cylinder or tampered with in
any way. The valve is pre calibrated to lift at 7 bar or 90 degrees centigrade and any attempt to
adjust it will invalidate the warranty.
6.4. Expansion vessel – A suitable expansion vessel with a pre-charge pressure of 3 bar is supplied for
fitting to all cylinders. All Solar 3C Cylinders must be fitted with a potable water expansion vessel
(supplied) and the expansion vessel MUST be connected into the cold water supply after the
pressure reducing valve. If the expansion vessel is connected into the cold water supply, it MUST be
fitted between the expansion relief valve and the cylinder. The expansion vessel MUST be positioned
with the entry point at the bottom.
IMPORTANT: Regular checks must be carried out to ensure that the expansion vessel is correctly
pressurised to 1.5 bar at all times.
6.5. Pressure reducing valve – Taking due account of the directional arrow, fit the pressure reducing
valve (PRV) in accordance with Figs 1a and 1b. This can be connected to a supply pressure of
between 1 and 10 bar maximum. The included pressure gauge to check flow pressure is to be
removed after the pressure is set.
6.6. Expansion relief valve – Fit the expansion relief valve (ERV) in accordance with Figs 1a and 1b. This
valve has been pre-set to lift at 6 bar. No other valve should be fitted between the expansion relief
valve and the cylinder.
6.7. Check valve (28mm monoblock inlet kit) – Taking due account of the directional arrow, fit the check
valve (CV) in accordance with Figs 1a and 1b. The monoblock can be used for balance cold outlet.
6.8. Secondary circulation – The Solar 3C Cylinder provides a secondary return connection to which a
secondary circulation circuit, 15mm leg incorporating a check valve, could be connected (see Figs 1a
and 1b for position of secondary return).
IMPORTANT: If a secondary circulation circuit is installed then a larger expansion vessel may be
required to handle the increase in volume within secondary up to capacity of expansion vessel.
Please ensure all installation and design considerations are met and double checked prior to hand
over to the end user.
6.9. Tundish – The tundish must not be positioned above or in close proximity of any electrical current
carrying devices or wiring.
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Summary of Contents for 3C382B
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