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WD51/2/1997 Chapter 2 - Boiler Connections
Boiler
Keston
Pressure
Guage
Drain
Cock
Safety
Valve
Expansion
Vessel
2.7.3
2.7.4
Installation & Servicing Instructions
Air Vent
Strainer
By-pass
Bal.
Valve
Pump
Figure 2.7.2 : Sealed System Diagram
All components of the system including the heat exchanger of the indirect cylinder
must be suitable for a working pressure of 3 bar and a temperature of 110
Care should be taken in making all connections that the risk of leakage is
minimised.
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 lockshield valve on the cylinder return to enable
balancing of the flow rate through the cylinder.
Boiler By-pass Piping
Boiler water flows are critical to the operation of the boiler. If flow cannot be
maintained through the system piping to meet the minimums required by the
boiler (see paragraph 2.7 (g)). Insufficient water flows through the boiler will cause
the boiler to "kettle" or even produce steam which can damage the heat
exchanger and will invalidate the heat exchanger warranty.
It is normally advisable to incorporate a boiler by-pass in the system, especially if
thermostatic radiator valves are used. The by-pass should be fitted with an
automatic by-pass valve to permit balancing of the by-pass flow rate. The
flow/return differential should be 10
maintain this condition with all thermostatic radiator valves closed.
The Keston 170 Condensing Boiler
L/S
RETURN
HEATING CIRCUIT
FLOW
Double Check
BS 1010:2
Valve
Stop Tap
Test Cock
o
o
C to 15
C. The valve should be adjusted to
Make -up vessel.
Max. capacity of
3 lt. (5pt)
Hose
Non-Return
Union
Valve
bib tap
Auto Air
Vent
Hosepipe
(disconnected
after filling)
Hose
Connector
Page : 9
o
C.
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