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220m min.
maintenance
access
Mains cold
water
Cold feed
GulfStream
- OV models
Figure 12 Schematic layout of the open vented heating system
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Supplied By www.heating spares.co Tel. 0161 620 6677
Warning/overflow
pipe
Open Vent
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SYSTEM DESIGN
In normal circumstances a pressure of 1.0 bar
is suitable for most domestic properties.
The minimum system pressure should be not
less than the static head, (the height of the
highest point in the system above the expansion
vessel plus a margin of 0.5 bar).
h. >250mm
Expansion Vessel
The appliance is supplied with a 12 litre
expansion vessel pre-charged to 1.0 bar.
The expansion vessel has to be suitable to
accommodate the change in volume of the
water in the system when heated between 10
to 110
0
C. See BS 5449: 1990 clause 16.2 for
further information.
NOTE: After first filling the system to a pressure
of 1.0 bar at mains supply temperature (typically
around 15
switched on, and the GulfStream
be heated to its maximum temperature. If the
pressure gauge then indicates 2.6 bar or higher,
an additional expansion vessel may be required
in the system. Expansion vessel requirements
are shown in Table 3.
3.2.3 Open Vented Central Heating System
The '-OV' models the GulfStream 2000 are only
E
M
E
N
T
S
suitable for an open vented system shown
schematically in Figure 12.
1
1
5 .
The F & E cistern can be fitted up to 10m above
4 1
5 .
1 2
8 .
the base of the appliance i.e. the maximum
static pressure in the appliance must not exceed
1 bar.
1
0 1
6 7
The water level in the F & E cistern should be
at least 250mm above the highest point on the
system including the radiators.
4 2
7 1
The overflow/warning pipe should be in a
20mm internal diameter pipe of suitable
material for use with a heating F & E cistern, in
accordance with BS 5449 (such as copper). It
. 0
1 1
. 0
6 1
should have continuous fall and discharge in a
conspicuous external position.
The cold feed pipe should be in 15mm overall
diameter copper tube or equivalent and the
open vent should be in 22mm copper or
equivalent.
Page 15
O
C in summer), the unit should be
2000
should
C
0
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