Glow-worm 18-30sxi Range - Manual (Page 20)

20 0020008155A
8 Safety Discharge Valve and Condensate Connections
8.1 Safety Discharge Valve
The pipe from the safety discharge valve must not discharge
above an entrance, window or any type of public access area.
A short discharge tube is supplied loose in the wall mounting
pack. This must be extended, using not less than 15mm o.d.
pipe, to discharge, in a visible position, outside the building,
facing downwards, preferably over a drain, see diagram 8.1.
The pipe must have a continuous fall and be routed to a position
so that any discharge of water, possibly boiling, or steam,
cannot create any danger to persons, damage to property or
external electrical components and wiring.
To ease future servicing it is advisable to use a compression
type fitting to extend the discharge pipe.
8.2 Condensate Drain Connection
The condensate drain connection is behind the pump at the rear
of the boiler, see diagram 8.2. 21.5mm plastic overflow pipe
should be used to fit into the drain connection on the condensate
siphon and discharge condensate to a drain. The drain pipe
should have a fall of at least 2.5
o away from the boiler.
Condensate should, if possible be discharged into the household
internal drainage system. If this is not practicable, discharge
can be allowed into the external household drains or a purpose
designed soak-away.
It is recommended that any external condensate drain pipe is
insulated or of a 32mm diameter, to prevent freezing in adverse
weather conditions.
The condensate is discharged periodically in ‘slugs’ by siphonic
action.
It is not necessary to provide air breaks or extra traps in the
discharge pipe as there is already a trap inside the boiler. Fitting
an extra trap may cause the boiler siphon to work incorrectly.
Refer to BS5546 or BS6798 for advice on the disposal of boiler
condensate.
A range of condensate fittings are available. These cost effective
easy to install condensate fittings, when used, are designed to
help installers with the easy removal of condensate.
The fittings are available from Hepworth Plumbing Products
and normal distribution channels.
Diagram 8.2
CAP
CONDENSATE
DRAIN
SPIGOT
11504
Diagram 8.1
SAFETY
DISCHARGE
VALVE
11694
SAFETY
DISCHARGE
VALVE PIPE
UNION NUT
Tighten half turn
past finger tight
CONDENSATE FITTINGS
Description Nom Dia. mm.
Overflow to Waste Adaptor (A021). 21.5
For connection to 32mm.
or 40mm Push - Fit or
Solvent Weld pipe.
Overflow to Rainwater 21.5
Adaptor (A022).
For connection to round
and square section downpipe.
Overflow to Soil 32 or 21.5
Adaptor (S117).
For connection to 110mm
soil pipe.
Overflow to Soil 40 or 21.5
Adaptor (S118).
For connection to 110mm
soil pipe.
Conensate Soakaway (S951). 21.5