Technical data

INSTALLATION & SERVICING INSTRUCTIONS
5.0 WATER SYSTEM 10
6.0
INSTALLATION PROCEDURE 16
7.0
INITIAL LIGHTING 18
8.0
COMMISSIONING 19
9.0
SERVICING 21
10.0
FAULT FINDING 27
11.0
SHORT LIST OF SPARE PARTS 31
Page 1
IT IS THE LAW THAT THIS APPLIANCE BE INSTALLED BY BRITISH GAS OR ANOTHER CORGI
REGISTERED INSTALLER.
INTRODUCTION
This Installation Manual is applicable to the following models from the Potterton Myson Economist
range of gas boilers:
WM15/30 BFa G.C. No. 41.838.90
WM30/40 BF G.C. No. 41.838.82
WM40/50 BF G.C. No. 41.838.85
These are balanced flue, wall mounted, central heating boilers, for use on natural gas only.
They require pumped circulation and cannot be used on gravity circulations. A bypass must always be
fitted into the heating system, across the boiler. A pump overrun thermostat is fitted as standard and a
permanent live connection to the boiler is required.
They may be range rated to suit individual heating systems.
Myson Ltd, pursues a policy of continuing improvement in design and performance of its products. The
right is therefore reserved to vary specification without notice.
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