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• A drain cock is required at the lowest point on the system.
S plan layout
E
Y plan layout with external diverter valve
E
System layout with optional internal diverter valve
fitted (not supplied with the boiler.
Cylinder
E
B
return
Cylinder flow
System fill
Non return
value
Hose
return
Stop
cock
Temporary hose
Heating return
System make up
Heating return Auto
air vent
return value
Stop
value
Fig. 6
6 720 815 724 (2015/11)
C
A
B
C
A
B
C
Heating
return
Heating flow
Non return
value
Mains
supply
Stop cock
Test cock
Make up
vessel
Non
1000mm (39in)
above the
highest point of
the system
6720647472-04.1Wo
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
D
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
D
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
NOTICE:
▶ Where a new or replacement appliance is being
installed, access to an internal "gravity discharge"
D
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
PRE-INSTALLATION
11
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