THERMAflow Ltd | THERMAFLOW® ELECTRIC COMBINATION BOILER |
Tel: 0870 850 5207
17
2.6.1 ELECTRICAL SUPPLY
IMPORTANT
If the boiler is wired to the Scottish Power Domestic & Economy 200 tariff, it requires two separate ~230-
240V power supplies. A (24HR) supply for controls and an interruptible supply for the boiler
. (Off Peak
power supply if it is
available
).
The off peak or interruptible mains supply is wired according to the following
diagram 2.6.1
, from the 63
amp double pole isolator by way of flexible 10mm² cable into the main terminals in enclosure marked
No.
16
on the boiler schematic on
page 9
of this instruction manual, see
diagram 2.6.1b
on
page 18.
If the boiler is wired to a 24 hour tariff or Economy 10 tariff for wet electric central heating then a separate
3 amp supply is not required for the controls as the controls are supplied via the 6 amp MCB in the
control box marked
No.16
on the boiler schematic on
page 9
of this instruction manual, see
diagram
2.6.1b
on
page 18.
A Local isolator may also be required at the boiler position.
diagram 2.6.1
CABLE SIZING
Boiler rating minimum Cable Size ~
230-240V-50Hz, TH6/ 5400-6000w
–25 amp –
10mm²
MCB MUST BE TYPE B.
2.6.2
The mains supply into the boiler shown in the diagram on page
9,
should be wired to the 24HR supply via
3 Amp fused isolating switch located at the boiler,
ref. diagram 2.6.2b
.
L
N
E
L
N
E
Supply
*
*
*
100A Double Pole
Isolating switch located in the
Thermaflow boiler control box
*
25mm
2
COLOUR CODED METER TAILS
CONNECT TO METER / TELE-SWITCH
100A Double Pole
Isolating switch
With
40A
or
63A
Type B
MCB located at meter or
consumer unit
100A Double Pole
local Isolating switch
located at the Thermaflow
boiler position
