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42 EXTERNAL ELECTRICAL CONTROLS
External wiring must be in accordance with the current I.E.E.
(BS.7671) Wiring Regulations.
Ideal Programmer Kit
This is supplied with its own instructions.
External Programmers
These should be of the single channel type (as this boiler
does not incorporate a pre-heat facility for the instantaneous
hot water service).
Programmer only - see Diagram A.
Programmers with room thermostat - see Diagram C.
Room Thermostat
This should be wired as shown in diagrams B &C. If the
thermostat has a neutral connection, use it (it provides for
more energy efficient operation by reducing switching
temperature differentials).
Frost Protection
Central heating systems fitted wholly inside the house do not
normally require frost protection as the house acts as a
'storage heater' and can normally be left at least 24 hours
without frost damage.
However, 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. This is usually
done at the programmer, in which case the programmer
selector switches are set to OFF and all other controls MUST
be left in the running position.
The frost thermostat should be sited in a cold place but
where it can sense heat from the system.
Wiring should be as shown, with minimal disturbance to other
wiring of the programmer.
Diagram B shows an application to boilers fitted with the
Ideal Programmer Kit
Diagrams A & C show applications to boilers fitted with
alternative time controls.
Designation of the terminals will vary but the programmer
and thermostat manufacturers' leaflets will give full details.
Note.
If the boiler is installed in a garage it may be necessary to fit
a pipe thermostat, preferably on the RETURN pipework.
43 COMMISSIONING AND TESTING
A. ELECTRICAL INSTALLATION
1. Checks to ensure electrical safety should be carried out by
a competent person.
2. ALWAYS carry out the preliminary electrical system checks,
i.e. earth continuity, polarity, resistance to earth and short
circuit, using a suitable test meter.
WARNING
. Whilst effecting the required gas soundness test and purging air from the gas installation, open all windows and
doors, extinguish naked lights and DO NOT SMOKE.
Response FF80
- Installation
Earths are not shown for clarity but must never be omitted.
N.B. These diagrams are schematic only
and do not show external terminal strips etc.
B. GAS INSTALLATION
1. The whole of the gas installation, including the meter,
should be inspected and tested for soundness and purged
in accordance with the recommendations of BS. 6891.
2. Purge air from the gas installation by loosening the gas
cock union and purge until gas is smelled.
3. Retighten the union and test for gas soundness.
INSTALLATION
31
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