Keston C40 Installation And Servicing Instructions page 16

WD265/0/2002
C40
or
C55
Drain
Cock
Safety
Valve
Safety Valve Setting
Vessel charge & initial system
pressure.
Total Water Content of system
25 litres
50 litres
75 litres
100 litres
125 litres
150 litres
175 litres
200 litres
225 litres
250 litres
275 litres
300 litres
Multiplying factor for other system
volumes
Table 2.7.2 Expansion Vessel Selection
2.7.3 Hot Water System (if applicable)
The hot water storage vessel must be of the indirect type (certain direct cylinders
can be used provided they are suitably adapted by fitting an immersion calorifier).
DIRECT CYLINDERS MUST NOT BE USED. Further guidance is provided in BS
1394. It is advisable to fit a locksheild valve on the cylinder return to enable
balancing of the flow rate through the cylinder.
The Keston Spa range of stainless steel unvented cylinders are an ideal
option for use with the Keston range. The Keston Spa range combine
Installation & Servicing Instructions
Chapter 2 - Boiler Location
Air Vent
Expansion
Vessel
By-pass
Bal.
Valve
Test Cock
Figure 2.7.2 : Sealed System Diagram
The Keston C40, C40P, C55 & C55P
L/S
RETURN
HEATING CIRCUIT
Hosepipe
( disconnected
FLOW
after filling )
Hose
BS 1010:2
Connector
Stop Tap
3.0 bar
0.5 bar 1.0 bar
Expansion Vessel
2.1 2.7
4.2 5.4
6.3 8.2
8.3 10.9
10.4 13.6
12.5 16.3
14.6 19.1
16.7 21.8
18.7 24.5
20.8 27.2
22.9 30.0
25.0 32.7
0.0833 0.109
Hose
Union
bib tap
Double Check
Valve
1.5 bar
Volume
3.9
7.8
11.7
15.6
19.5
23.4
27.3
31.2
35.1
39.0
42.9
46.8
0.156
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