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5.3 WIRING INSTRUCTIONS
Warning: observe the usual precautions to ensure that the electricity supply is isolated before commencing
any installation or service work.
- The appliance is fitted with a flying lead for 230 V ~ 50 Hz.
This should be wired as described in section 4.5 electricity supply.
Note: The ignition and flame control by ionisation circuit is polarised. For this reason, it important that live
and neutral are not reversed. (If upon commissioning the boiler the burner lights but no flame is detected it
is likely that the polarity is incorrect).
WARNING: THIS APPLIANCE MUST BE EARTHED.
ROOM THERMOSTAT:
It is recommended that for optimum operating efficiency, this appliance should be used in conjunction with an
external room thermostat.
The voltage between the contacts of the room
thermostat is 24V (normally closed). Any 24V
controls may be used, but gold contacts are
recommended.
DO NOT
under any circumstances use a mains
supply to the stat as you will blow the P.C.B. in
the boiler. Only voltage free switching stats
should be used. The terminal block for the room
stat connections can be found by pulling off the
front cover to reveal the block at the bottom
right hand side. Remove the bridge to wire in
the stat.
The room thermostat must be installed on a wall which is free from any objects and free from direct contact
with either sunlight or draughts.
5.4 WATER AND GAS CONNECTION
Connect the boiler up in such a way as to leave the connecting pipes self supporting and free from any stress.
Check that the gas pipe complies with the requirements of section 4.6
In order for the boiler to function correctly and to have a long working life, the hydraulic installation must be
well designed, and it is necessary that the temperature difference between the flow and the return should not
be greater then 20°C.
