Boiler Connection; Programmable Room; Thermostat - Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual

6.3 Boiler Connection

The Electromax boiler has a rated maximum
output of 9kW or 6kW at 240V ~ . The supply
cable must therefore be separate and
dedicated to the boiler. The supply cable
should be a minimum of 10mm
area, (check the IEE Wiring Regulations for
correct cable sizing). It must be routed into
the Electromax via the 25mm cable gland
previously fitted (see section 3.3, page 10). The
Live (Brown) conductor should be connected
to the termination marked "L SUPPLY"; the
Neutral (Blue) conductor should be connected
to the termination marked "N SUPPLY"; the
Earth (Green/Yellow) conductor should be
connected to the termination marked
" SUPPLY ". Where "twin and earth" cable
is being used the bare earth conductor should
be sleeved with suitable Green / Yellow earth
cable sleeving. See section 6.1, page 20 for
MCB and isolation requirements.
BOOST
SWITCH
C.H. ON
D.H.W. ON
SWITCH
SWITCH
3 3 3
2
2
2
1
1
ALL EARTH POINTS MUST BE LINKED
BACK TO THE CONTROL ASSEMBLY
EARTH TERMINATIONS
Diagram 14 Schematic Wiring Diagram
22 Installation & Servicing Instructions
6.4
Connection
Refer to the instruction leaflet supplied with the
programmable room thermostat and diagram
14 (schematic wiring diagram). Connection to
cross sectional the Electromax should be with 2 core cable
2
of 0.5mm
suitable for a 240V supply, bell wire MUST
NOT be used. The cable must be routed into
the Electromax via one of the 20mm cable
glands previously fitted (see section 3.3, page
10). One conductor should be connected
to the termination marked "TO ROOM
THERMOSTAT L"; the other conductor should
be connected to the termination marked
"FROM ROOM THERMOSTAT RUN".
Please note that the terminations on the
programmable
"B COM" and "C N/O" should be used.
Connection to terminal "A N/C" will result in
incorrect operation of the Electromax boiler.
The clock function of the programmable
room thermostat is battery operated (2 x AA/
MN1500/LR alkaline batteries supplied).
BOOST (TOP)
IMMERSION HEATER WIRES
IMMERSION HEATER WIRES
3A FUSE
P1
P4
P22
P3
P15
P2
P20
P17
P18
P29 P26 P25 P24 P23 P19
P27
NEON
3A FUSE
OFF 24 OFF 24
PEAK HOUR SPARE PEAK HOUR SPARE
N N L L
OFF PEAK 24 HOUR
SUPPLY 16 AMP SUPPLY 16 AMP
Programmable
to 1.0mm
2
room
OFF PEAK (LOWER)
P9 P10 P11 P12
P8 P7 P6 P5
P16 P28 P13 P14
ROOM ROOM
L
STAT. STAT. N
L R
ELECTRIC BOILER
SUPPLY
A B C
N/C COM N/O
PROGRAMMABLE
ROOM THERMOSTAT (SUPPLIED)
Room

Thermostat

cross sectional area
2
thermostat marked
LIVE
EARTH
NEUTRAL
PUMP N
PUMP E
PUMP L
CONTROL N
CONTROL R
TO BOILER SUPPLY BLOCK (N)
TO BOILER SUPPLY BLOCK (E)
TO BOILER SUPPLY BLOCK (L)