PRE-INSTALLATION
6 720 815 724 (2015/11) 11
• A drain cock is required at the lowest point on the system.
Fig. 6
3.4 Condensate discharge
3.4.1 Appliance siphonic condensate trap
The appliance has a large capacity siphonic condensate trap reducing
the risk of condensate discharge freezing up in prolonged cold
temperatures.
Like the CondenseSure siphon accessory, the expanded siphonic
operation discharges every 15 to 20 minutes, resulting in:
• Increased velocity and flow rate.
• With only 3 to 4 siphonic actions per hour, the condensate pipework
is empty for longer.
• Eliminated freezing potential.
– For a 48 hour period at -15 °C provided the installation
parameters listed below are adhered to.
To maximise the effectiveness of this product the installer
should:
• Keep the external pipework as short as possible and not exceed 3m.
– External run pipe diameter should be increased to a minimum of
32mm.
• Ensure a fall of at least 2.5° over horizontal sections.
• Minimise the number of bends and connectors.
• Remove burrs after cutting pipe.
• Remove surplus solvent from the interior of the pipe.
3.4.2 Condensate pipe work
A
C
D
B
E
A
C
D
E
B
Cylinder
return
Cylinder ow
Heating
ow
E
B
C
D
Heating
return
Heating return
Hose
Non return
value
Non return
value
Test cock
Mains
supply
Stop cock
Stop
cock
Temporary hose
return
Heating return
Auto
air vent
Non
return value
Stop
value
Make up
vessel
1000mm (39in)
above the
highest point of
the system
S plan layout
Y plan la
y
out with external diverter valve
System layout with optional internal diverter valve
tted (not supplied with the boiler.
System ll
System make up
6720647472-04.1Wo
NOTICE:
▶ Where a new or replacement appliance is being
installed, access to an internal “gravity discharge”
point should be one of the factors considered in
determining appliance location.
▶ The condensate pipe must be nominally
22mm Ø plastic pipe.
▶ The condensate pipe work must fall at least 52mm
per metre towards the outlet and should take the
shortest practicable route.
▶ Ensure there are no blockages in the pipe run.
NOTICE: Unheated internal areas.
Although the large volume siphon will reduce the risk of
freezing, condensate discharge may freeze in areas of
prolonged cold temperatures.
▶ Internal pipe runs in unheated areas such as lofts,
basements and garages should be treated as
external runs.
Key to condensate illustrations, figures 7, 8 & 9
1 Condensate discharge from appliance
2 Soil and vent stack
3 Minimum 450mm and up to three storeys
4 Visible air break at plug hole
5 Sink or basin with integrated overflow
6 75mm sink waste trap
7 Condensate pump
* Condensate trap of 206mm already incorporated into the
appliance
Table 11 Key to Internal condensate disposal methods
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