16
Alpha SolarSmart 100 - Installation
4.6 FIT THE BOILER AND CONNECT THE PIPEWORK
1. An Alpha combination boiler should be used with the SolarSmart system. Install the boiler as described in the
instructions supplied with the boiler.
2. Connect the outlet from the solar cylinder directly to the boiler cold water inlet connection, as shown in Fig. 1.
If the boiler has a Seasonality valve fitted it must be fully opened (turn adjusting screw fully clockwise).
Notes:
a. If the solar system is being fitted to an existing boiler installation, the mains water inlet must be re-routed to
the inlet of the solar cylinder.
b. It is recommended that a thermostatic mixing valve is fitted in the hot water outlet before the taps.
3. Clip the boiler inlet sensor (supplied with the cylinder) to the boiler inlet pipe as close to the boiler as possible. This
should be connected to the boiler low voltage terminals 8 and 9 (DHW inlet sensor), the polarity of the connections is
not important. Refer to the boiler wiring
diagram.
4. A self adhesive label is supplied with
the cylinder. This label
must
be located
adjacent to the domestic hot water
thermostat knob which must be set
to max. as shown in Fig. 18. This will
ensure that the hot water temperature
from the boiler will be approximately
60°C.
Note:
The User must be informed of
the purpose of this label, which
must
not
be removed.
4.7 CONNECT THE PIPEWORK
Refer to Figs. 1 and 19 and the wall templates when connecting the pipework.
1. Thoroughly flush out all the water pipework.
Ensure that all the plastic caps are removed from all connections.
Note:
If soldering union bends, ensure that the bends are not connected to the valves etc., otherwise the internal seals
may be damaged, (soldered connections cannot be used between the solar collector and DBU, or direct to the cylinder
connections).
2. Connect the system pipework to the boiler and the pressure reducing and isolation valves, supplied, in the mains cold
water inlet to the cylinder. See Figs. 1 and 19.
Do not forget that all pressure relief valve
discharge pipes must be routed clear of
the boiler and cylinder to a drain in such a
manner that they may be seen, but cannot
cause injury to persons or property. Refer to
Section 3.3 and the boiler instructions. Refer
to Fig. 4 when connecting to the cylinder
tundish.
This pipework must be installed as
recommended in Unvented Hot Water
Storage System, see Section 3.3.
4. Check that the pressure in the cylinder
expansion vessel (see Fig. 20) is 2.5 bar. If
it is not, adjust the pressure to give 2.5 bar.
Check when the system is not pressurised
(drained).
5. Connect the mains water supply and
complete the pipework. Thoroughly flush
the water pipework. Refer to Domestic Hot
Water System, Sections 3.2 and 3.3.
6. Ensure that all the valves are closed
(spindle flats at right angles to valve) and do not turn on the water supply at this stage.
bar
0
4
3
2
2.5
3.5
1.5
0.5
1
CORRECT PRESSURE
WHEN COLD
RESET
INFO
RESET
BOOST
bar
°C
x100rpm
IMPORTANT
MUST
This Combi boiler is fitted to an
Alpha Solar system and the domestic
hot water thermostat
always be
set at maximum
Fig. 18
Fig. 19
Water outlet
to boiler
15 mm
Cold water
inlet
15 mm
Return from
DBU
15 mm
Flow to
DBU
15 mm
Compression fittings only
Cold water
inlet filter
Tundish outlet
