External Electrical Controls - IDEAL istor HE260 Installation And Servicing

INSTALLATION

44 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. For IE reference should be made to the current
ETCI rules for electrical installations.
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.
Note.
If the boiler is installed in a garage it may be necessary to fit
a pipe thermostat, preferably on the return pipework.
Wiring should be as shown, with minimal disturbance to
other wiring of the controls.
Designation of the terminals will vary but the programmer
and thermostat manufacturers' leaflets will give full details.
Diagram A shows an application to boilers fitted with a room
thermostat only.
Earths are not shown for clarity but must never be omitted.
External Programmer
The built in programmer may be remotely in order to give
more convenient access to the boiler user controls and
display.
istor system store - 37
Installation and Servicing