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4.3
Water systems and pipe work
Plastic pipework:
• Any plastic pipe work must have a polymeric barrier with 600mm
(minimum) length of copper pipe connected to the appliance.
• Plastic pipe work used for underfloor heating must be correctly
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50 °C.
Primary systems connections/valves:
• All system connections, taps and mixing valves must be capable of
sustaining a pressure up to 3 bar.
• Radiator valves should conform to BS2767:10.
• All other valves should conform to BS1010.
• Thermostatic radiator valves (TRV's) must be used on all radiators
within the sleeping accommodation but not the radiator where the
room thermostat is sited. This must be fitted with lock-shield valves
and left open.
• A drain cock is required at the lowest point in the system.
• An air vent is required at all the high points in the system.
The appliance is equipped with an internal by-pass.
The internal bypass is not intended to be a substitute for
an external system bypass.
An external automatic bypass should be used if the
system flow can be significantly adjusted or stopped by
zone valves and thermostatic radiator valves (TRV).
Sealed primary system:
Refer to figures 5 & 6
NOTICE: Artificially softened water must not be used to
fill the central heating system.
▶ Do not use artificially softened water to fill the central
heating system.
• The CH sealed system must be filled using a WRAS approved filling
loop or comply with figure 4 for system fill.
• Where the system volume is more than 100 litres or exceeds 2.65
bar at maximum heating temperature, an extra expansion vessel [2]
must be fitted as close as possible to the appliance in the central
heating return.
• Pressurise the extra expansion vessel [2] to the same figure as the
expansion vessel built into the appliance.
• Do not use galvanised pipes or radiators.
NOTICE: Drain point
▶ A drain cock should be fitted at the lowest point(s) of
the heating circuit and beneath the appliance.
System fill
Heating
return
Hose union
SV
CV = Check Valve
Temporary hose
SV = Stop Valve
Fig. 4
System fill
Greenstar i System
- 6 720 806 945 (2015/07)
ErP
Example installation (S-Plan)
Fig. 5
Example installation (Y-Plan)
Fig. 6
Table 10 Key to figures 5 & 6
Optional integral diverter valve kit
This appliance is designed to operate on a sealed system only. The
appliance will require a second return pipe from the water cylinder to the
wall mounting frame and terminate in 15mm copper pipe.
Details for the connection of the integral diverter valve kit components
are found within the Installation Instructions for the kit.
Mains
supply
CV
CV
SV
Test point
NOTICE: Two port valves
▶ An automatic bypass valve is required when fitting an
S-plan type system with two-port valves.
5
1
2
M
4
3
Sealed system, S-Plan
5
1
2
M
4
3
Sealed system, Y-Plan
1
Appliance expansion vessel - CH
2
Extra expansion vessel - CH return
3
Pressure relief discharge
4
Automatic bypass valve
5
Zone valves
6
Thermostatic radiator valve (flow)
7
Lock shield valve (return)
Pre-installation
7
6
7
6
17
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