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PRE-INSTALLATION
SEALED PRIMARY SYSTEM:
NOTICE: Artificially softened water must not be used to
fill the central heating system.
• The CH sealed system must be filled using a WRAS approved filling
loop or comply with figure 2 for system fill.
• Where the system volume is more than 100 litres or exceeds 2.65 bar
at maximum heating temperature, an extra expansion vessel (2) must
be fitted as close as possible to the appliance in the central heating
return.
• Pressurise the extra expansion vessel (2) to the same figure as the
expansion vessel built into the appliance, (approximately 0.75 bar).
• Do not use galvanised pipes or radiators.
SYSTEM FILL
Heating
return
Hose union
SV
Temporary hose
CV = Check Valve
SV = Stop Valve
Fig. 2
System fill
TYPICAL SEALED SYSTEM
1
2
3
4
Fig. 3
Sealed system
1
2
6
M
3
4
Fig. 4
Sealed system with zone valves
1
Appliance expansion vessel - CH
2
Extra expansion vessel - CH return
3
Pressure relief discharge
4
Drain cock
5
Radiators
6
Zone valves
Table 8 Key to figs. 3 and 4
14
Mains
supply
CV
CV
SV
Test point
5
5
5
5
4
6720643895-06.1Wo
5
5
5
5
4
Available pump head
In order to save as much energy as possible and the
minimise the possibility of water circulation noise, a low
characteristic should be chosen.
The pump map can be selected within 2.1C in the Boiler settings menu
list:
• 0 (pump variable speed setting)
• 1 (constant pressure low)
• 2 (constant pressure low/middle)
• 3 (constant pressure middle/high)
• 4 (constant pressure high)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
1
0.1
0
0
200
400
600
Flow Rate (l/hr)
The factory setting is:
4 (constant pressure high)
Constant pressure head
If the constant pressure head option (1 - 4) is chosen, the differential
pressure between the CH flow and return will be kept at the
corresponding value. When the CH system is cold and the radiator TRVs
are fully open, the pump will be running faster to try and maintain the
pressure differential. When the TRVs start to close and the resistance of
the CH system increases, the pump speed reduces to maintain the
pressure.
The setting (1 - 4) to be selected is dependent upon the resistance and
heat load of the CH system. The higher these are, the higher the pressure
constant
4.4
Condensate pipe work
NOTICE:
▶ Where a new or replacement boiler is being installed,
access to an internal "gravity discharge" point should
be one of the factors considered in determining
boiler 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.
Key to condensate illustrations
1
Condensate discharge from boiler
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 75mm already incorporated into the boiler
CDi Compact
4
3
2
1000
1600
800
1200
1400
6720813276-13.1Wo
ErP
- 6 720 813 276 (2015/07)
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