6
3.1
ELECTRICAL SUPPLY
The Solar system requires a 230/240 V ~ 50 Hz mains supply, fused at 3 A - The system must be earthed.
There must only be one common isolator, providing complete electrical isolation, for the Solar system.
This system has been fitted with a supply cable, however, if it is necessary to fit a cable use PVC insulated cable not less
than 0.75 mm² (24 x 0.2 mm) to BS 6500 Table 16. The system should be connected to a fused three pin plug and
unswitched shuttered socket outlet (both complying with BS 1363), or a fused double pole switch with a contact
separation of at least 3 mm in both poles.
Note: There is no electrical connections between the boiler and the Solar system. Therefore, it is recommended that the
Solar system electrical isolation is completely separate to the boiler and any external controls isolation.
All wiring must be in accordance with the current IEE Wiring Regulations (BS 7671).
3.2
DOMESTIC HOT WATER SYSTEM
The mains water supply must be first connected to the components detailed in Section 3.3 before the Solar cylinder. No
valves must be fitted between these components and the cylinder. The incoming mains water pressure to the cylinder is
regulated to 2.5 bar by the pressure reducing valve supplied in the unvented package. However, all taps and mixing
valves used with the hot water system must be suitable for operating at a pressure of up to 8 bar.
The Solar valve, supplied in the unvented package, must always be fitted directly to the cold water inlet of an Alpha
combination boiler.
Note: The hot water control thermostat on the combination boiler must always be turned to maximum.
To ensure economic use, the pipe runs to the Alpha combination boiler and taps should be in 15 mm copper pipe and
be as short as possible. Where possible the pipework should be insulated to reduce heat loss.
Before the mains water supply pipe is connected to the boiler, it should be thoroughly flushed out to avoid the danger of
dirt or foreign matter entering the boiler and the filter incorporated within the pressure reducing valve cleaned.
The stored water temperature is controlled to a maximum of 70°C.
To prevent high temperatures at the hot water taps, it is recommended that a thermostatically controlled mixing valve is fitted
after the boiler.
3.3
UNVENTED HOT WATER STORAGE SYSTEM
To comply with the Building Regulations for unvented hot water storage, it is required that the unvented kit components
detailed in Fig. 3 are fitted before the mains cold water inlet to the Solar cylinder. No isolating valves must be fitted
between these components and the cylinder.
All these components are supplied with the Solar system in a separate package and must be fitted by a competant
person in accordance with the instructions.
The installation is subject to Building Regulations approval and the Local Authority must be notified of the intention to install.
Discharge pipe - The discharge pipes from the temperature/pressure and expansion relief valves must be routed to the
tundish supplied and in 15 mm pipe. The discharge pipework from both relief valves may be joined together in the same
sized pipe, providing at least 22 mm pipework is connected downstream of the tundish.
Tundish - The tundish must be positioned within 500 mm of the appliance, so that it is visible to the User and away from electrical
devices. The minimum size of the discharge pipe downstream of the tundish is given in the following table.
The discharge pipework from the tundish:-
3
GENERAL INFORMATION
Alpha SolarSmart 150 - General Information
1. Shall fall continuously through its length.
2. Shall be of a heat resistant material, e.g. metal.
3. Shall not be fitted with any valves or taps.
4. Shall discharge to a safe visible position, e.g. into a gulley.
5. Shall have a minimum of 300 mm straight pipework directly from the tundish.
Note: Where children may play or otherwise come into contact with discharges, a wire cage or similar guard must be
positioned to prevent contact whilst maintaining visibility.
Resistance created
by each elbow
or bend
0.8 m
1.0 m
1.4 m
Maximum resistance allowed,
expressed as a length of straight
pipe (i.e. no elbows or bends)
up to 9 m
up to 18 m
up to 27 m
Minimum size of discharge
pipe 'D2' from tundish
22 mm
28 mm
35 mm
Minimum size of discharge
pipe 'D1' to tundish
15 mm
Valve
outlet size
G½
Sizing of copper discharge pipe 'D2' - refer also to Fig. 4A and 4B
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818
