Technical data

INSTALLATION & SERVICING INSTRUCTIONS
BS5440 Part 1, 1990 ; BS5440 Part 2, 1989;
BS5449 1990; BS5546 1990;
BS6798 1987; BS6891 1988;
2.2 Gas Supply
Installation pipes should be fitted, tested for soundness and purged in accordance with BS6891, 1988.
Pipework from the meter to the boiler should be of a size to ensure an adequate supply of gas, as set
down in BS6891, 1988. Normally 15mm diameter pipe will be necessary to supply the gas rate shown
in the Technical Data section, being adequate for Model WM1 5/30 BFa up to a length of 15m, for
Model WM30/40 BF up to a length of of 9m and for Model WM40/50 BF up to a length of 7.5m. These
lengths are reduced by 0.5m for each elbow and tee.
2.3 Electricity Supply
All electrical wiring must be carried out by a qualified electrician. All external components should be of
an approved type and wired in accordance with current IEE regulations and any local regulations that
may apply.
The appliance must be earthed. The supply to the boiler should be 240V - 50Hz and fused at 3A. The
rating of the boiler is approximately 5VA.
IT MUST BE POSSIBLE TO COMPLETELY ISOLATE THE BOILER AND ALL ASSOCIATED
CONTROLS FROM MAINS ELECTRICITY. THE COMPLETE ELECTRICAL SYSTEM MUST BE
POWERED FROM A SINGLE POINT, WHICH SERVES THE HEATING SYSTEM ONLY. THIS
POINT CAN BE CONNECTED USING A FUSED THREE PIN PLUG AND SHUTTERED SOCKET,
BOTH COMPLYING WITH THE REQUIREMENTS OF BS1363. ALTERNATIVELY, A FUSED
DOUBLE POLE SWITCH WITH A CONTACT SEPARATION OF AT LEAST 3mm ON BOTH POLES
MAY BE USED.
All external cables to the boiler should be rated to take at least 3A, ie at least 0.75mm2 (24/0.2mm) to
BS6500 1990, Table 16. There must be a permanent live connection to the boiler, unswitched by any
external controls, for the pump overrun facility to work.
Page 7
3.0 RANGE RATING
The boilers covered by this manual can be range rated to suit individual systems. They can be used
where the maximum loads fall within the values of heat output shown in the Technical Data Section.
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