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▶ Fit a fire valve in accordance with BS 5410. The fire valve [5] should
be fitted externally to the building with the fire valve sensor [8]
located within the appliance case. A fire valve with a shut off
temperature of 85°C or higher must be fitted to avoid the possibility
of a nuisance shut off. The fire valve must be a minimum of 1 metre
from the appliance. A capillary type valve provides a neat and simple
installation, or a fusible link or electrical system may be used.
4.2.5
Boiler isolation valve
▶ Use copper pipe of the correct diameter according to the information
shown in oil supply sections , & .
– If using soft copper pipe (R220) with a compression fitting, an
insert must be used to prevent the pipe from collapsing or
distorting when the fitting is tightened.
▶ Slide nut [1] and olive [5] onto the oil supply pipe [4].
▶ Slide insert [3] into the pipe.
▶ Offer the pipe to the fitting [2] and tighten the nut [1].
1
5
4
3
Fig. 7
Isolation valve bracket removed for clarity
▶ Use flexible hoses to connect from the boiler isolation valve/s and the
oil pump.
4.3
Water systems and pipework
The boiler should not be allowed to operate with a return
temperature of less than 30°C when the system is up to
operating temperature.
Primary system plastic pipework
• Any plastic pipework used for the CH system must have a polymeric
barrier, complying with BS 7921 and installed to BS 5955 with
1000mm (minimum) length of copper or steel pipe connected to the
boiler.
• Plastic pipework used for underfloor heating must be correctly
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50°C with 1000 mm
(minimum) length of copper or steel pipe connected to the boiler,
and a 20 K differential must be maintained at the appliance.
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 BS 2767:10.
• All other valves should conform to BS 1010.
• An automatic bypass valve must be connected between the heating
flow and return where TRVs are used on all radiators, fitted to give at
least a 3 metre circuit when activated.
• Drain cocks are required at all the lowest points on the system.
• Air vents are required at all high points on the system.
Sealed primary system
• 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) must be fitted as close as possible to the
appliance in the central heating return.
Greenstar Heatslave II External
ErP -
6 720 813 345 (2014/09)
• Pressurise the extra expansion vessel (B) to the same figure as the
expansion vessel (A) built into the appliance.
A
E
B
U
P
Fig. 8
Regular boiler, open vent system layout
[A]
Expansion vessel*
[B]
Extra expansion vessel
[C]
Automatic bypass valve
[D]
Drain cock
[E]
Appliance
[L]
Lockshield valve
[R]
Radiators
2
[T]
Thermostatic radiator valve TRV
[U]
To filling system
Filling primary sealed systems
Filling the system
▶ The system must not be filled with artificially
• 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] must be fitted as close as possible to the
appliance in the central heating return.
• Pressurise the extra expansion vessel [B] to the same figure as the
expansion vessel built into the appliance (system boilers).
• Filling the system must comply with the method shown in the figure
below.
• 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
CV = Check Valve
SV = Stop Valve
Fig. 9
R
T
R
L
C
D
softened water.
Hose union
CV
SV
Temporary hose
AA = Auto Air vent
CV = Check Valve
Pre-Installation
R
T
L
L
R
T
L
L
D
6720805209-82.1Wo
Mains
supply
CV
SV
Test point
11
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