THERMAFLOW LTD | THERMAFLOW® ELECTRIC COMBINATION BOILER |
Tel: 0870 850 5207
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 16mm² cable into the main terminals in enclosure marked
No.
17
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 Scottish & Southern Energy 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.17
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, 8,250-9,000w –
10mm²
, 11,000-12,000w –
16mm²
.
MCB MUST BE TYPE C.
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
.
17
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
50A
or
63A
Type C
MCB located at meter or
consumer unit
100A Double Pole
local Isolating switch
located at the Thermaflow
boiler position
