10
2000225233B
3 Water Systems
Diagram 3.2
6458
FEED AND
EXPANSION
CISTERN
22mm VENT
(MIN.)
15mm (MINIMUM)
COLD FEED
OPEN VENTED FULLY PUMPED WATER SYSTEM
RECOMMENDED RELATIONSHIP BETWEEN
PUMP COLD FEED AND VENT
450mm
MIN.
HEIGHT
1150mm
MIN.
RETURN
FLOW
CYLINDER
PUMP
HEATING
150mm
MAX.
BOILER
IF REQUIRED
22mm (MINIMUM)
BY-PASS WITH
LOCKSHIELD VALVE
FLOW
RET.
Diagram 3.3
1metre Min.
27 metres
Max.
22mm VENT & 15mm COLD FEED
TO BE FITTED IN ACCORDANCE
WITH BS 5449
INDIRECT
CYLINDER
ALTERNATIVE
SYSTEM
CONTROL
VALVES
HEATING
SYSTEM
PUMP
FULLY PUMPED CIRCULATION
SYSTEM (DIAGRAMMATIC)
6462
IF REQUIRED
BYPASS 22mm
MIN WITH
LOCKSHIELD
VALVE
28mm
PIPE
RETURN
FLOW
4114
1metre Min.
27 metres
Max.
22mm FOR COMBINED FEED & VENT
TO BE FITTED IN ACCORDANCE
WITH BS 5449
INDIRECT
CYLINDER
ALTERNATIVE
SYSTEM
CONTROL
VALVES
HEATING
SYSTEM
PUMP
FULLY PUMPED CIRCULATION
BYPASS (DIAGRAMMATIC)
6463
IF REQUIRED
BYPASS 22mm
MIN WITH
LOCKSHIELD
VALVE
3.11 Expansion Vessel
A diaphragm type expansion vessel, conforming to the current
issue of BS4814 (see also BS7404 Part 1 and 2) must be
connected at a point close to the inlet side of the circulating
pump, see diagram 3.4 unless laid down differently by the
manufacturer.
The expansion vessel volume depends upon the total water
system volume and the initial system design pressure. For any
system an accurate calculation of vessel size is given in the
current issue of BS5449 and BS7074 Part 1, for IE refer to the
current edition of I.S.813 "Domestic Gas Installations".
Example. For an initial system design pressure of 0.7bar the
minimum total vessel volume required is 0.063xTotal System
volume.
NOTE: A higher initial design pressure requires a larger volume
expansion vessel.
The charge pressure must not be less than the static head of the
system, that is, the height of the highest point of the system
above the expansion vessel.
The water content of the boiler is given in Data Table 1.
3.12 Pressure Gauge
A pressure gauge with a set pointer and covering at least the
range 0 to 4bar (0 to 60lb/in
2
) shall be permanently fitted to the
system in a position where it can be seen when filling the
system.
22 X 28
UNION
CONNECTION
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