Supplied By www.heating spares.co Tel. 0161 620 6677
3
221045A
1 G e n e r a l
Diagram 1.3
Diagram 1.4
PLASTIC
CAP
DATA
LABEL
PILOT WINDOW
SCREW (2)
INNER
CASE
COVER
SECURING
SCREW (4)
4579
4580
1.3 Isolation of Boiler
Before commencing any servicing or the replacement of
parts, isolate the boiler from the electrical supply at the
external isolator and close the gas service cock, see
diagram 1.1.
BEFORE DRAINING THE BOILER, REFER TO
SECTION 1.6.
1.4 Outer Case Removal
The door opens to the left or right hand side. The door
catch is spring loaded, to open, push the side opposite to
the hinge then pull.
Remove the two screws securing the outer case then
unhook the case at the top and pull it forward and off,
see diagram 1.2.
1.5 Cover - Inner Case
Remove the cover of the inner case, secured by four
screws, see diagram 1.3.
1.6 System Pressures and Draining
WARNING. All parts containing water of the central
heating circuit within the boiler, are under the system
pressure. Before any parts of this circuit are
disconnected, reduce the system pressure at the external
draining tap. Turn the central heating isolating valves
off and drain at the drain points on the appropriate
valves, see diagram 1.1.
All water containing parts of the domestic hot water
circuit of the boiler will be under the supply water
pressure. Before any parts of this circuit are
disconnected, turn the domestic cold water isolating
valve off, open the hot water taps to reduce the water
pressure in the boiler, close the hot water isolating valve
and drain the boiler at the valves, see diagram 1.1.
After replacing any water containing part of the central
heating circuit, make up the water loss, vent all air and
pressurise the system. Refer to “Commissioning” in the
Installation Instructions.
Check for water soundness.
