The modular design of the Keston Commercial range lends
itself ideally to multiple boiler installations. As a result almost
any heating output requirement can be accommodated using
multiple Keston units.
Using this multiple boiler approach the system can be
controlled to ensure optimum matching of boiler output to
load at any given time. In addition, individual units can be
taken off-line for servicing with minimal impact on system
performance.
CLEARANCES
The boilers are designed for ease of servicing and installation.
On the Keston 260 and Keston 340 all servicing is carried
out through the front of the unit. On the Keston 130 and
Keston 170 additional access is required to the top of the
cabinet for removal of the burner.
Details of installation clearances are provided in the table on
the back page of this brochure.
Multiple
BOILER INSTALLATIONS
Preassembled Boiler Plant Rigs
In circumstances where site time and/or space may be at a premium
Keston Boilers can provide a pre-assembled solution to any plant
room needs.
The Keston Rigs are delivered to site pre-assembled and incorporate
up to three units within a floor standing frame. The units are pre-
piped to a single balance header.
The Keston Rigs include :
● Safety Valves
● Up to three Keston ● Isolating Valves
commercial units as
● Test Points
specified by the customer
● Drain Points
● Individual shunt pumps ● Single Balance Header
for each unit sized according to output
The incorporated equipment is pre-piped and pre-wired ready for
immediate connection within the plant room.
The balance header includes tappings for air vent, fill point/expansion
vessel, drain off and system flow and return. The number and size of
system tappings is as per the customers own specification.
Floor Standing Boiler Frame
Where plant room wall space is at a premium a floor standing frame is
available for the Keston 260 and Keston 340.
Balance Headers
A range of standard headers is available from Keston Boilers Ltd for
single and multiple installations. In addition bespoke headers can be
produced in order to meet customers specific requirements.
Hospital Project:
6 Keston 170’s
OPTIONS
Common Balance Headers
Boiler water flows are critical to the operation of the boilers.
If flow cannot be maintained through the system pipework
to meet the minimums required by the boiler the boiler will
"kettle" or even produce steam. The implementation of a
balance header, as shown in the schematics, is
recommended to ensure adequate water circulation is
maintained through the boiler by the boiler shunt pumps,
irrespective of system conditions.
The size of the balance header is dependant on the number
of boilers serving the header
A guide to sizing is given here:
When assembling a balance
header the following design
considerations must be observed:
a) Each boiler must have its own
flow and return connection to the balance header pipe.
Common flow and return connections with other boilers
can cause reverse circulation effects to occur.
b) The minimum distance between the system flow and
return connections is 600mm
c) A drain off point should be fitted to the base of the
header, along with cleaning access, for sludge removal.
The top of the header should be vented.
7
Total Boiler Header
Output Diameter
up to 100kW 3"
up to 200kW 4"
up to 300kW 4.5"
up to 400kW 5"
(28 pages)
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