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Pre-Installation
Mini expansion
vessel
(0.75ltr capacity)
3 bar pressure
Incoming
reducing
mains
valve
stop valve
MCW
Check valve/
non return valve
Balanced cold water
supply to property
Fig. 10
Showers/Bidets:
• If a shower head can be immersed in water or comes closer than
25mm from the top edge of a bath or shower tray spill over level then
an anti-siphon device must be fitted to the shower hose.
Only thermostatically controlled showers are suitable for use with
this appliance.
• Bidets with direct hot & cold mains water can be used (with the
approval of the local water authority) and must be the over rim
flushing type with shrouded outlets to prevent the fitting of hand held
sprays.
Domestic hot water:
Plastic pipework
• Any plastic pipework used for the DHW system must have a
polymeric barrier, complying with BS 7921 and installed to BS 5955
with 1000mm (minimum) length of copper or stainless steel pipe
connected to the boiler.
• Before installing plastic pipework, the pipe manufacturer's literature
should be consulted.
• To prevent the temperature & pressure exceeding the limits advised
by the pipe manufacturer, a pressure reducing valve must be used to
prevent the incoming water pressure exceeding 3 bar (maximum).
Also a mini expansion vessel must be fitted to absorb the expanding
water and a blending valve set to 60°C must be fitted before the DHW
plastic pipework.
• When selecting plastic pipework for use with domestic water supply,
it should be ensured that it is compliant with all current local &
national legislation & regulations, including building regulations part
G, BS 7291 - 1,2 & 3: 2006, BS 8000 - 15-15: 1990 and
information.
General:
• Taps and mixing valves must be capable of sustaining a pressure up
to 10 bar in accordance with the Water Regulations as they will be
operating at mains water pressure.
• Hot water temperature and flow rate are affected by the size and
insulation of pipework making up the distribution system and are
controlled by the hot water tap and the water main inlet pressure. A
mixing valve can be fitted if a more permanent setting is required.
• If using more than one outlet at once causes water flow starvation, fit
flow balancing valves or Ball-O-Fix valves to the appropriate outlets.
12
Hot water supply
to property
Greenstar Heatslave II
external oil fired
combination boiler
Blending valve
set to 60°C
6720805210-20.1Wo
4.4
Condensate pipework
▶ 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.
4.4.1
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
5
21.5mm Ø
Fig. 11 Disposal to a soil vent stack
Fitting an external air break
• Refer to figure 12 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.
Greenstar Heatslave II External
3
6
4
ErP -
6 720 813 345 (2014/09)
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