PRE-INSTALLATION
Greenstar FS CDi
ErP
6720818079 (2016/04)
11
3.3
Water systems and pipe work
PRIMARY SYSTEM PLASTIC PIPEWORK:
• Any plastic pipe work must have a polymeric barrier with 600mm
(minimum) length of copper connected to the boiler.
• Plastic pipe work used for under floor heating must be correctly
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50°C. The pipe work
from the boiler to the blending valve must be in copper.
PRIMARY SYSTEM/CONNECTIONS/VALVES:
•
Do not use galvanised pipes or radiators.
• All system connections, taps and mixing valves must be capable of
sustaining a pressure of 3 bar.
• Radiator valves should conform to BS2767:10.
• All other valves should conform to BS1010.
• On new installations a TRV should be used on all radiators except the
radiator where the room thermostat is sited, this must be fitted with
lock-shield valves and left open.
• All installations should have a TRV fitted to radiators within the
sleeping accommodation.
• Drain cocks are required at all the lowest points on the system.
• Air vents are required at all high points on the system.
FILLING PRIMARY SEALED SYSTEMS:
• Filling the primary system must comply with one of the methods
shown.
• The filling point must be at low level and must never be a permanent
direct fixing to the mains water supply.
• Filling loops must be WRAS approved.
Fig. 3
System fill
[CV] Check Valve
[SV] Stop valve
[AA] Auto Air vent
[*]
Pressure gauge - If the external filling link is sited away from the
boiler, or the boiler does not have a pressure gauge, then a
pressure gauge should be installed at the filling point
SYSTEM Layout:
S & Y PLAN OPEN VENT PRIMARY SYSTEM
Generally a by-pass is not necessary on a Y plan system as one of the
ports is open to flow.
• The feed and expansion cistern [14] must be positioned to provide a
static head [13] of at least 250mm above the highest point in the
heating system.
• The heating vent [2] and cold feed [3] pipes must rise continuously
from the appliance.
• The heating vent pipe [2] must be at least Ø22mm.
• No valve shall be fitted in the heating vent pipe [2] or cold feed [3].
S PLAN LAYOUT
Fig. 4
Open vent S Plan configuration
Y PLAN LAYOUT
Fig. 5
Open vent Y Plan configuration
SYSTEM FILL
SYSTEM MAKE UP
SV
CV
AA
Make up
vessel
Heating
return
1000 mm (39 inches)
above the highest
point of the system.
6720818079-16.1W
o
SV
SV
Test point
Temporary
hose
Pressure gauge
Hose union
CV
CV
Heating
return
Mains
supply
2
3
1
0
4
bar
*
Key to system layout illustrations
1
Boiler
2
Heating vent (min. Ø22mm)
3
Primary cold feed and expansion pipe (min. Ø15mm)
4
Diverter valve
5
Pump
6
Automatic by-pass
7
Radiator valve (flow)
8
Lockshield valve (return)
9
Expansion vessel
10
Pressure gauge
11
Relief valve
12
Stop valve
13
Static head
14
Feed and expansion cistern
Table 7 Key to figures 4, 5 and 6
6720648568-03.1W
o
13
min. 250mm
150mm max.
7
4
8
5
6
13
min. 250mm
1
14
3
2
6720648568-04.1W
o
3
5
7
8
4
2
150mm max.
13
min. 250mm
13
min. 250mm
1
14
