Water Systems - Keston C40 Installation And Servicing Instructions

WD265/0/2002
the length of run from the meter to the boiler at a supply rate of 46kW for the C40
and 57kW for the C55 model.
A gas cock is supplied loose with the boiler. This cock should be fitted in the gas line to
the boiler as close to the boiler as possible so that it is easily identified as the cock to
isolate the boiler.
2.7

WATER SYSTEMS

All piping must be installed in accordance with all applicable local and Water Supply
Bylaws for forced hot water heating systems.
Consideration must be given to pipe capabilities and pressure drop through the piping
when selecting pipe sizes. The primary pipe connections to the boiler must be sized
according to the system load, not dictated by the boiler connection sizes.
Water treatment must be carried out to BS 7593 : Treatment of Water in Hot Water
Central Heating Systems.
a The C40 and C55 are suitable for use on open, vented water systems with
combined feed and vent fitted to the boiler return.
b It is preferable for use on sealed water systems, provided the appropriate
components required (see Section 2.7.2 Sealed Systems) are included in the
system.
c Any system must be thoroughly flushed clean of grease, dirt and debris, prior to
connection with the boiler. A trap may be installed in the flow line to collect any
solder, or other debris, from the installation.
d All water systems must be constructed to comply with requirements of the Local
Water Authority.
e Always use a system complying with the requirements of BS 5449 and BS 6798.
f System design must ensure an open circuit is always available to ensure
circulation when the pump overrun function is operating after boiler shutdown.
Expansion
Pipe
C40
or
C55
(See note 2.7.1)
FLOW
RETURN
Rad. 2
Installation & Servicing Instructions
Chapter 2 - Boiler Location
Expansion
Tank
28mm
Safety Minimum
Valve
By-pass
The Keston C40, C40P, C55 & C55P
Figure2.7.1 : Open Vented System Diagram
Minimum
9ft Height
Valve
Rad. 1
Cylinder
L/S
Valve
Valve
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