Condensate Discharge; Condensate Pipe Work - Bosch Worcester Greenstar Ri ErP + Series Installation And Maintenance Instructions Manual

PRE-INSTALLATION
SEALED SYSTEM Y PLAN LAYOUT
The central heating sealed system must be filled using a WRAS approved
filling loop or comply with figure 3 for System fill.
4
M
5
reset max
12
MCW
11
10
9
Fig. 6 Y plan sealed system
NEW BUILD SYSTEM LAYOUTS
The latest Part L1a regulation for new installations require separate zone
controls for the central heating.
Open vent with two heat zones
3
2
150 mm
max
5
reset max
4
6
Fig. 7 Two heating zones open vent
Sealed system with two heat zones
5
reset max
4
12
6
MCW
11
10
9
Fig. 8 Two heating zones sealed system
16
SEALED SYSTEM LAYOUT
8
7
6720644744-05.1Wo
OPEN VENT LAYOUT
1
8
7
6720644744-61.1Wo
SEALED SYSTEM LAYOUT
8
7
6720644744-62.1Wo
4.3

Condensate discharge

Full details on condensate discharge.
▶ Follow the latest version of BS6798 and HHIC
guidance.
For correct installation and trouble free operation of the appliance the
following advice should be followed:
1. All condensate pipework must 'fall' from the appliance by a minimum
of 3 degrees (52mm per metre) to ensure adequate Condensate flow.
2. The pipework route must allow air to be supplied back to the
appliance for correct operation of the siphon.
3. Connection to a rainwater down pipe must include an air break.
Also:
• Keep external pipework as short as possible and not exceed 3 metres
length.
• External pipework should be increased to a minimum diameter of
32mm and ideally be insulated.
• Minimise the number of bends and connectors.
• Remove burrs after cutting pipe.
• Remove surplus solvent from the interior of the pipe.

4.3.1 CONDENSATE PIPE WORK

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 9, 10, & 11
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
Table 10 Key to Internal condensate disposal methods
6 720 821 670 (2018/06)