Condensate Pipework - Bosch GREENSTAR HEATSLAVE EXTERNAL 18/25 Instruction Manual

8 716 113 389d 30/3/10 14:01
b
C
A
Invert
d
C
A
J
K
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389d (03/2010)
All manuals and user guides at all-guides.com
Page 13
a
C
B
A
75mm
min.
c
E
C
A
(Unsuitable for clay soil types)
500mm min.
F
200mm min.
IMPORTANT: The pressure relief valve is a
safety device for the boiler and if activated
may discharge boiling water or steam
through the relief valve drain pipe.
Care should be taken when siting the outlet
pipe so that it does not cause an obstruc-
tion or discharge into a public area where it
could cause a hazard.
CONDENSATE &
PRESSURE RELIEF PIPEWORK

CONDENSATE PIPEWORK:

• All national and, where appropriate, local
regulations for the discharge and
neutralisation of condensate should be
followed.
• The condensate pipe must be a minimum of
21.5mmØ polypropylene pipe.
D
• The condensate pipework must fall at least
50mm per metre towards the outlet and
should take the shortest practicable route
• Support the pipe at least every 0.5m for near
horizontal runs and 1m for vertical runs.
• When a boiler is to be installed in an unheated
location, such as a garage, all condensate
pipes should be considered as external.
External pipework:
D
• The 21.5mmØ pipe must not exceed 3 metres
outside the building. If a run greater than 3m is
required, 32mmØ pipe must be used.
• Any pipe exposed to windchill or extreme cold
must be 32mmØ.
• Protect all external pipes with weather resistant
insulation and box-in, if necessary to reduce the
risk of freezing.
• Terminate as close to the ground or drain as
possible (below the grating and above the
25mm
water level) while still allowing for safe
min.
dispersal of the condensate. This will help
G
reduce windchill freezing.
Connection of a condensate pipe to a drain may
be subject to to local building regulations.
400mm
I
min.
Making it safe:
H
• Condensate pipework must not leak, freeze or
block up.
• Condensate traps must be filled before starting
up the boiler to prevent potentially harmful flue
products escaping via the condensate route.
• Do not dispose of condensate into water
recovery systems.
Condensate can be discharged into a rain water
hopper which is part of a sewer system carrying
both rain water and foul water.
• The pipework must follow one of the options
shown opposite:
a - Internal waste drainage system
b - Soil/vent stack
c - External drainage system
d - External condensate absorption point
A - Condensate from the boiler internal
condensate trap which has a 75mm
minimum water seal.
B - Sink.
C - 21.5mm Ø polypropylene condensate pipe.
D - Gully.
E - Internal soil and vent stack.
F - 300mm x 100mm Ø sealed plastic tube.
G - Ground level.
H - Drainage holes 50mm from base of tube
(12mm Ø at 25mm centres) facing away
from building.
I - Limestone chippings.
PRESSURE RELIEF PIPEWORK:
• The pressure relief drain pipe (K) should be
at least 15mm diameter copper pipe and run
downwards away from the boiler and discharge
away from any electrics or other hazard,
preferably to an external drain or soakaway.
• Pipe (K) should be finished with a partial
bend, near the outlet to face the external wall
(as shown) to help prevent freezing.
PRESSURE RELIEF PIPEWORK
13
CONDENSATE &