33
INSTALLATION
ESPRIT 2 - Installation and Servicing
39
EXTERNAL ELECTRICAL CONTROLS
Wiring External to the Boiler
The fuse rating should be 3A.
Wiring external to the boiler MUST be in accordance with the
current I.E.E. (BS.7671) Wiring Regulations and any local
regulations.
Room Thermostat
If the thermostat has a neutral connection, use it (it provides
for more energy efficient operation by reducing switching
temperature differentials).
Frost Protection
If parts of the pipework run outside the house or if the boiler
will be left off for more than a day or so then a frost thermostat
should be wired into the system.
The frost thermostat should be sited in a cold place but where
it can sense heat from the system.
Earths are not shown for clarity but must never be omitted.
Diagram B
Shows the fitting of a frost thermostat. An option kit must be
purchased to allow this.
Diagram A
Shows an application to boilers fitted with a room
thermostat only.
L3
L2
L1
N
Room 'stat
N
if required
nm8428
A
Mains in
System
controls
INSTALLATION
206091-1.pmd 26/05/2010, 16:0833
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