Condensate Pipework; Condensate Disposal Connections - Worcester Greenstar 12/18 Installation, Commissioning And Servicing Instruction Manual

Pre-Installation
Filling primary sealed systems
NOTICE: FILLING THE SYSTEM
▶ The system must not be filled with artificially
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] figure 10 must be fitted as close as possible to
the appliance in the central heating return.
• Pressurise the extra expansion vessel [B] figure 10 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 11.
• 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
CV = Check Valve
SV = Stop Valve
SYSTEM MAKE UP
Heating
AA
return
SV
Fill point
Fig. 11 System fill and make up
14
Mains
supply
CV CV
SV
Test point
AA = Auto Air vent
CV = Check Valve
Make up
vessel
CV
1000 mm (39 in)
above the highest
point of the system.
4.5

Condensate pipework

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 Polypropylene 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.
Externally run condensate drainage pipe should terminate at a suitable
foul water discharge point, or purpose-designed soak away. If this
method is chosen then the following measures should be adopted:
▶ The external run be kept as short as possible and not exceed three
metres.
▶ The pipe diameter should be increased to 32mm and should be
insulated using suitable waterproof and weather resistant insulation.
▶ The external pipe should take the shortest and least exposed route to
the discharge point, and should "fall" as steeply as possible away
from the boiler, with no horizontal runs in which condensate might
stand.
▶ The use of fittings, elbows etc. should be kept to a minimum and any
internal "burrs" on cut pipe work should be removed so that the
internal pipe section is as smooth as possible.
4.5.1

Condensate disposal connections

Condensate drainage pipe can be run above or below
ground.
Key to condensate illustrations
1 Condensate discharge from boiler
2 Universal connector
3 Soil and vent stack
4 Minimum 450mm and up to three storeys
5 Pipe work transition
6 Insulate and increase pipe size
7 External rain water pipe into foul water
8 External air brake
9 43mm pipe (min 100mm upstand)
10 PVCu strap on fitting
11 43mm 90° male/female bend
* Condensate trap of 75mm already incorporated into the boiler
2
1
21.5mm Ø
Fig. 12 Disposal to a soil vent stack
Greenstar Danesmoor External ErP and External System
6
5
4
ErP - 6 720 813 288 (2014/09)
3