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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
heating 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 con-
tact separation of 3 mm on each pole. The fused
spur box should be readily accessible and prefer-
ably 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 cur-
rent issue of BS1363.
The mains electrical supply must be maintained at
all times in order to provide domestic hot water.
Do not interrupt the mains supply with a time switch
or programmer.
WARNING: ON NO ACCOUNT MUST ANY EXTERNAL
VOLTAGE BE APPLIED TO ANY OF THE TERMINALS ON
THE HEATING CONTROLS CONNECTION PLUG.
Warning: This appliance must be wired in accord-
ance with these instructions. Any fault arising from
incorrect wiring cannot be put right under the terms
of the Saunier Duval guarantee.
External controls
The ISOMAX boiler is designed to operate at maxi-
mum efficiency at all times, but will be most effi-
cient and economical when connected to a room
thermostat.
A suitable room thermostat is available as an ac-
cessory, Saunier Duval part number 40011. Please
contact your supplier.
Also available :
For extra control or if the boiler is to be sited in a
garage or utility room an optional remote control
unit with programmable roomstat can be obtained
part number 85915 (Isocom), diagram 2. This is a
dual function unit (a) boiler control (same as boiler
facia) (b) programmable room stat. Full fitting
instructions supplied with the unit.
F
14
Isocom only
The boiler will work for heating without a room ther-
mostat being connected provided that the wire
link fitted between the two terminals of the con-
nector (E) is left in place, see diagram 17.
Alternatively, a 230V room thermostat can be used
but do not make any connection to the compen-
sating resistor, see diagram 17.
ON NO ACCOUNT must any electrical voltage be
applied to any of the terminals of the external con-
trols plug.
Note: For further information, see the building
regulations 1991 - Conservation of Fuel and Power
- 1995 edition - appendix G, Table 4b.
The boiler is supplied with a mains lead at-
tached. Connect this to the electrical supply.
Diagram 16
Leave link in place for no external controls.
F
Diagram 17
IMPORTANT
With voltage free room
thermostat
Without room
thermostat
E
E
¡C
E
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