Bosch 12/18 User Manual

PIPEWORK CONNECTIONS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)

PIPEWORK CONNECTIONS

H -

Flue manifold condensate outlet

Condensate outlet (21.5mmØ) -

supplied

K -

Condensate pipe - not supplied

L -

Condensate trap with clamp -

supplied

M -

Pressure relief (15mmØ)

CONDENSATE CONNECTION:
The condensate trap (L) must be installed

onto the bracket supplied.

Measure condensate pipe (J) mark and cut

square to length required.

Fit sealing washer inside condensate pipe

nut and connect to the flue manifold outlet (H).

Connect 21.5mm polypropylene pipe (K) (not

supplied) to the condensate pipe (J)
and condensate trap (L) before terminating
to waste.

Secure the condensate trap (L) with clamp

supplied.

Ensure that the condensate pipe runs away

from the boiler at a constant fall of 50mm

(min.) for every metre.

Carefully pour 500ml of water into the

condensate collection (R) to fill condensate trap.

Check the water is running away and the

condensate pipework joints are water tight.

Check the flue manifold seal is undamaged

and seated correctly.

Refit flue manifold access cover (Q) and

secure with screws (P).

IMPORTANT: The condensate trap must be
correctly filled to prevent the possibility of
potentially harmful flue products escaping
via the condensate pipework.

PRESSURE RELIEF CONNECTION:
Connect the pressure relief pipe (M) to a

copper discharge pipe (15mmØ min.) and
terminate externally to the appliance casing.

Blank all unused casing holes with the bungs

or cover plates and seals supplied. The
drain/fire valve capillary hole covers should
be rotated so that the unused capillary slot is
covered by the cover plate and seal.

Refit rear panel.

Seal all joints where pipes pass through the

casing, with suitable waterproof sealant.

IMPORTANT: Insulate all
external condensate pipe
work or run in 32mm pipe
work to prevent freezing.