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 the approved methods
only.
WARNING
. Whilst effecting the required gas tightness test and purging air from the gas
installation, open all windows and doors, extinguish naked lights and DO NOT SMOKE.
A. ELECTRICAL INSTALLATION
1. Checks to ensure electrical safety should be carried out by a
competent person.
2.
earth continuity, polarity, resistance to earth and short circuit,
using a suitable test meter.
39
COMMISSIONING AND TESTING
38
EXTERNAL ELECTRICAL CONTROLS
Wiring external to the boiler MUST be in accordance
and any local regulations.
The fuse should be 3A.
Room Thermostat
If the thermostat has a neutral connection use it.
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. 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.
If the boiler is installed in a garage it may be
return pipework.
Important.
so that the system pump and/or external diverter
valve is energised, as appropriate.
will give full details.
Diagram A
with a room thermostat only.
Diagrams B and C show applications to boilers
Earths are not shown for clarity but MUST NEVER BE OMITTED.
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