Condensate Discharge; Condensate Pipe Work - Bosch WORCESTER Greenstar Danesmoor 18/25 Installation, Commissioning And Servicing Instruction Manual

Pre-Installation
Fully pumped sealed primary system:
• A pressure relief valve (P), spring loaded safety valve set to operate
at 3bar, must be fitted to the heating flow pipe as close as possible to
the boiler or onto one of the boiler top 1" BSP outlets.
• An expansion vessel (B) must be fitted to the heating return pipe as
close as possible to the boiler and pressurised for the system volume
according to the instructions supplied with the vessel.
• A pressure gauge (G), 3 bar minimum, must be fitted to the heating
flow pipe or one of the boiler 1" BSP outlets.
• An automatic air vent (N) must be fitted.
K1
Fig. 12 Regular boiler system layout
A1
P1
K1
Fig. 13 System boiler system layout
Filling primary sealed systems
NOTICE: FILLING THE SYSTEM
▶ The system must not be filled with salt based
softened water.
• Where the system volume is more than 180 litres at 0.5 bar or
exceeds 2.65 bar at maximum heating temperature an extra
expansion vessel (B) must be fitted as close as possible to the
appliance in the central heating return.
• Pressurise the extra expansion vessel (B) to the same figure as the
expansion vessel built into the appliance (system boilers).
• Filling the system must comply with one of the methods shown in the
figure below.
• The filling point must be at low level and must never be a permanent
connection to the mains water supply.
• Filling loops must be WRAS approved.
SYSTEM FILL
Heating
return
Hose union
SV
Temporary hose
Fig. 14
[SV] Stop valve
[CV] Check valve
16
6720808218-08.1Wo
6720808218-109.1Wo
Mains
supply
CV CV
SV
Test point
Greenstar Danesmoor Kitchen
4.5

Condensate discharge

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 condensate trap.
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.
4.5.1

Condensate pipe work

Follow HHIC guidance and recommendations for
condensate disposal
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
21.5mm 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.
The condensate discharge may freeze in areas during
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 12, 13, 14 & 15
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
Table 5 Key to Internal condensate disposal methods
ErP+ and Kitchen System ErP+ -6 720 821 686 (2018/04)