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WD420/3/2007
g
Copper tubing to BS 2871 Part 1 or barrier plastic pipe suitable to 110
Unipipe, is recommended.
h
Jointing should be either with capillary, threaded or compression fittings. Pipes
should have a gradient to ensure air is passed easily to vent points and water
flows readily to drain points.
i
Draining taps must be located in accessible positions which permit the draining of
the boiler. Draining taps should be at least 22 mm in nominal size and be in
accordance with BS 2879.
AIR VENT POINTS
j
These must be fitted at all high points where air will naturally collect and must be
sited to allow complete draining of the system.
Table 3.7 Additional Expansion Vessel Selection
k.
The boiler is supplied with an integral expansion vessel of 8l capacity. This is
suitable for systems of up to 125 litres system volume. Table 3.7 Expansion
Vessel Selection provides guidance for the correct additional expansion vessel
size to use for systems with a water content larger than 125 litres. Any additional
KESTON
Qudos 28s
Drain
Cock
Figure 3.7 : Sealed Systems Diagram
vessel must be fitted on the boiler primary return.
l
A filling point must be fitted, in accordance with local water authority
requirements.
Installation & Servicing Instructions
Chapter 3 : Boiler Location
Safety Valve Setting
Vessel charge & initial system
pressure.
Total Water Content of system in
excess of 125 litres
25 litres
50 litres
75 litres
100 litres
125 litres
$LU 9HQW
Additional
Expansion
Vessel
(if required)
By-pass
Dbl Check Valve
The Keston Qudos 28s & Qudos 28sP Boilers
/6
RETURN
HEATING CIRCUIT
FLOW
%6
6WRS 7DS
7HVW
&RFN
o
C, such as
3.0 bar
1.0 bar
Vessel
Volume
2.7
5.4
8.2
10.9
13.6
+RVH 8QLRQ
ELE WDS
+RVHSLSH
GLVFRQQHFWHG
DIWHU ILOOLQJ
+RVH
&RQQHFWRU
Page : 15
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