Benchmark Alpha E-Tec Plus 28 Installation And Servicing Instruction page 5

2.1 ELECTRICAL SUPPLY
ATTENTION:
The power supply cable must be connected to a 230 V ±10% / 50 Hz mains supply respecting L - N
polarity and earth connection;
category (contact separation of at least 3 mm in both poles) or a fused 3 A 3-pin plug and unswitched shuttered socket outlet
(both complying with BS 1363) in compliance with installation regulations.
The boiler is supplied with a 'Special X' type electrical connection with a PVC <HAR> H05VV-F 3 x 0.75 cable without a plug.
If the power cable is damaged or replaced, it must be replaced with a cable supplied by Alpha or authorized After-Sale
Technical Service. Replacement is recommended using a qualified company in order to prevent any risk.
The boiler must be earthed.
There must only be one common isolator, providing complete electrical isolation, for the boiler and any external controls.
Wiring external to the boiler must be in accordance with the current IEE Wiring Regulations (BS 7671).
Note: If a room thermostat is fitted, it must be suitable for 230 V switching.
If the boiler is locked out and an error code is shown on the display, the RESET button can be pressed to try and clear the fault.
If the fault still occurs after pressing the RESET button, then contact an approved engineer or Alpha service support department.
2.2 DOMESTIC HOT WATER SYSTEM
The minimum flow rate needed for the flow switch and burner to operate is 1.5 litres/min.
The incoming mains water pressure should be between 0.2 bar (0.02 MPa) and 5 bar (0.5 MPa) to ensure
efficient operation. If the pressure is above 5 bar a pressure reducing valve must be fitted.
Following Part L Building Regulations, where the mains water hardness exceeds 200 parts per million, provision
should be made to treat the feed water to the hot water circuit of combination boilers to reduce the rate of accumulation
of limescale.
To ensure economic use, the pipe runs between the 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.
All taps and mixing valves used with the hot water system must be suitable for operating at a mains pressure of up to 8 bar.
Showers - A shower may be used with the boiler if required.
If a loose or flexible head type shower is used it may require the fitting of a double check valve, to comply with Water Bye Law 17.
Bidets - No anti-syphonage arrangements are necessary, provided the outlets are shrouded and it is not possible to attach
a temporary hand held spray. A supply of direct mains fed hot and cold water is permitted provided the appliance is of the
over-rim flushing type.
If the mains supply is fitted with a water meter, check valve or loose jumper stop cock, then a DHW expansion device MUST
be fitted.
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.
2.3 PHYSICAL DATA
Boiler flow and return connections
DHW inlet (cold) DHW outlet (hot) connections
Gas connection diameter
Boiler dimensions
Clearances for servicing
Recommended hole size for flue pipe
Recommended hole size for instalation from inside the building
Boiler dry lift weight
Boiler operating weight (full of water) approx.
Max. total flue length
Max. total flue length
Flue system diameter
, this must be connected to a fused 3 A double pole switch with class III overvoltage
Height
Width
Depth
Bottom
Bottom (with jig)
Top (horizontal flue)
Top (vertical flue)
Sides
Front
E-Tec Plus 28
E-Tec Plus 33
E-Tec Plus 38
E-Tec Plus 28
E-Tec Plus 33
E-Tec Plus 38
Horizontal
Vertical
Alpha E-Tec Plus 28, 33 and 38 - Safety Symbols and Information
mm 22
mm 15
mm 22
mm 712
mm 440
mm 268
mm 150
mm 250
mm 235
mm 150
mm 5
mm 450
mm 110
mm 130
kg 33.6
kg 35.5
kg 36.7
kg 35.8
kg
37.9
kg 40.5
m 12
m 14
mm 60/100
5