16
ELECTRICAL CONNECTION
Warning. This boiler must be earthed
All system components must be of an approved type.
Connection of the whole electrical system and any heat-
ing system controls to the electrical supply must be through
a common isolator.
Isolation should preferably be by a double pole switched
fused spur box having a minimum contact separation of 3
mm on each pole. The fused spur box should be readily
accessible and preferably adjacent to the boiler. It should
be identified as to its use.
A fused three pin plug and shuttered socket outlet may be
used instead of a fused spur box provided that:
a) They are not used in a room containing a fixed bath or
shower.
b) Both the plug and socket comply with the current issue
of BS1363.
The mains electrical supply must be maintained at all times
in order to provide domestic hot water.
Do not interrupt mains supply with time switch/programmer.
WARNING: ON NO ACCOUNT MUST ANY EXTERNAL VOLT-
AGE BE APPLIED TO ANY OF THE TERMINALS ON THE HEATING
CONTROLS CONNECTION PLUG.
Warning: This appliance must be wired in accordance with
these instructions. Any fault arising from incorrect wiring
cannot be put right under the terms of the Saunier Duval
guarantee.
External controls
The ECOSY condensing boilers are designed to operate at
maximum efficiency at all times. The boiler will run at its’
maximum efficiency when connected to a programma-
ble electronic room thermostat. A programmable room
thermostat is available as an accessory, Saunier Duval
part number 40010. Please contact your supplier.
The boiler will work for heating without a room thermo-
stat and/or timeswitch being connected provided that
the wire link fitted between the upper two terminals of
the connector is left in place, see diagram 18 a.
A 230V room thermostat can be used but do not make
any connection to the compensating resistor, see dia-
gram 18a.
ON NO ACCOUNT must any electrical voltage be applied
to any of the terminals of the external controls plug.
For use with a timeswitch or timeswitch and room ther-
mostat, see diagram 18 a.
ECOSY SB 24 E/SB 28 E
The boiler will work for heating without a room thermo-
stat and/or timeswitch being connected provided that
the wire link fitted between the top two terminals of the
connector is left in place, see diagram 18 b.
A 230V room thermostat can be used but do not make
any connection to the compensating resistor, see dia-
gram 18b.
ON NO ACCOUNT must any electrical voltage be ap-
plied to any of the terminals of the external controls plug.
A voltage free storage cylinder thermostat, where fitted,
should be connected to the lower two terminals of the
external controls plug, see diag. 18 b.
ON NO ACCOUNT must any electrical voltage be ap-
plied to any of the terminals of this plug.
No external controls No external controls
Room thermostat only
Room thermostat only
Room thermostat and time clock
Factory
fitted link
Boiler
connector
Voltage free room
thermostat
Time clock
Do not
connect
External controls
plug
Voltage free room
thermostat
Do not
connect
Voltage free room
thermostat
Do not
connect
Voltage free
cylinder
thermostat
External controls
plug
Time clock
External
controls plug
Timeclock, room thermostat and cylinder thermostat
Voltage free
room thermostat
Do not
connect
External
controls
plug
Factory
fitted link
Sch 070UK
ECOSY 24 E, ECOSY 28 E
ECOSY SB 24 E, ECOSY SB 28 E
Warning:
- All external controls must be voltage free
- On no account must any external voltage be applied to any of the external controls plug terminals
Diagram 18a Diagram 18b
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