Bosch Worcester Greenstar CDi Compact ErP Series - Condensate Pipe Work

PRE-INSTALLATION
CDi Compact
ErP
- 6 720 813 276 (2015/07)14
SEALED PRIMARY 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
Fig. 2 System fill
TYPICAL SEALED SYSTEM
Fig. 3 Sealed system
Fig. 4 Sealed system with zone valves
Available pump head
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)
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: Artificially softened water must not be used to
fill the central heating system.
1 Appliance expansion vessel - CH
2 Extra expansion vessel - CH return
3 Pressure relief discharge
4 Drain cock
5Radiators
6 Zone valves
Table 8 Key to figs. 3 and 4
CV = Check Valve
SV = Stop Valve
SV SV
Test point
Temporary hose
Hose union
CV
CV
Heating
return
Mains
supply
4
4
1
2
3
5 5
55
6720643895-06.1Wo
4
6
4
2
3
5 5
55
M
M
6720646608-04.1Wo
1
In order to save as much energy as possible and the
minimise the possibility of water circulation noise, a low
characteristic should be chosen.
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
400
600
800
1000
1200
1400
1600
0.8
0.6
0.7
0.5
0.4
0.3
0.2
0.1
0
4
3
2
1
6720813276-13.1Wo
Flow Rate (l/hr)
Pressure (bar)
0
200