Pre-Installation
Greenstar Danesmoor External
ErP+
and External System
ErP+
6720821725 (2018/04)14
Filling primary sealed systems
• 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 the method shown in 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.
Fig. 11 System fill
[SV] Stop valve
[CV] Check valve
4.5 Condensate pipework
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
Fig. 12 Disposal to a soil vent stack
Fitting an external air break
• Refer to figure 13 when a rain water down pipe is used to dispose of
condensate.
• An air break must be installed in the 43mm pipe work, between the
boiler condensate outlet and the drainpipe, outside the property, to
avoid flooding during adverse weather conditions.
Fig. 13 Disposal into a rainwater down pipe
NOTICE: FILLING THE SYSTEM
▶ The system must not be filled with salt based,
softened water.
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.
NOTICE: Rainwater or external drain disposal
Untreated condensate must not be allowed to flow into
streams or rivers
▶ A rainwater down pipe or an external drain shall only
be used for condensate disposal if the down pipe or
external drain is connected to a combined foul and
rainwater system
▶ Refer to BS 6798 for more information
NOTICE: Grey water systems
Contamination of recovered water
▶ Condensate disposal shall not be allowed into a grey
water recovery system that is intended for re-use
NOTICE: Freezing conditions
▶ Pipe work length should be kept to a minimum and the
route as vertical as possible.
▶ When required, use only weather proof insulation.
NOTICE: Condensate waste
▶ Care should be taken when siting a soak-away to
avoid obstructing existing services.
SYSTEM FILL
SV SV
Test point
Temporary hose
Hose union
CV
CV
Heating
return
Mains
supply
Condensate drainage pipe can be run above or below
ground.
Key to condensate illustrations
1 Condensate discharge from boiler
2 Push fit 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
8External air break
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
6720809437-03.1Wo
3
5
6
4
2
1
21.5mm Ø
6720809437-04.1Wo
5
6
2
1
7
8
10
9
11
21.5mm Ø
To Next Page
Loading...
