Instruction manual

SAFETY:
All relevant safety precautions must be undertaken.
Protective clothing, footwear, gloves and safety
goggles must be worn as appropriate.
PIPEWORK POSITIONS:
A to D (opposite) show the flue and pipe positions:
A - Flow/optional open vent/air vent 1ӯ BSP
B - Primary drain/optional feed and expansion
/feed 1ӯ BSP
C - Return 22mmØ copper
D - Flue outlet
E - Condensate outlet 21.5mmØ
NOTE: For servicing purposes, keep the
condensate and pressure relief
discharge pipes away from
components and pipework
connections.
FLUE OPENING:
 Follow the diagram opposite to mark the
centre of the flue (1, & 2) for rear opening,
(2 & 3) for side opening or
(1 & 4) for top opening.
** IMPORTANT: for horizontal flues, increase
this height by 52mm for every 1000mm of
horizontal length that the flue opening is
away from the boiler.
NOTE: All horizontal flue sections must rise
away from the boiler by 52mm per metre
to ensure that condensate flows back into
the boiler for safe discharge via the
condensate waste pipe.
 Make an opening (F, G or H) through the wall
using a core drill or similar at a size relative to
the wall thickness as shown below:
125mmØ flue:
Wall thickness Flue hole size
150 - 240mm 155mmØ
240 - 330mm 160mmØ
330 - 420mm 165mmØ
420 - 500mm 170mmØ
278
4417
INSTALLATIONCOMMISSIONING
CAUTION: Ensure there are no pipes,
electric cables, damp proof courses or
other hazards before drilling.
PIPEWORK POSITIONS &
FLUE OPENING
PIPEWORK POSITIONS &
FLUE OPENING
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR DANESMOOR UTILITY 18/25
8 716 106 256C (03/2010)
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