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WD420/3/2007
Chapter 3 - Boiler Location
If an additional pump is required the selected pump must comply with BS 1394. Provision
must be made in the system design for control of the additional pump. A connection point
is availble within the boiler to signal operation of the additional pump. However, this will
need to drive the additional pump via a suitable relay.
KESTON
Q28s
Drain
Cock
3.7.4
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 exceptional recovery
times with durable, long life stainless steel construction and all associated
controls. Contact Keston Boilers Ltd for information
The Qudos 28s also has advance control options built in which enable modulated reheat
of DHW and anti-legionella function. Refer to Chapter 4 for more detail.
3.7.5
Filling The System
The system should be filled using a G24 approved filling loop. The system pressure
should be set to between 1.0 and 2.0 bar. To display the system water pressure press the
" " button repeatedly until the water pressure is displayed (indicated by the word "bar" to
the right of the pressure reading). Fill the system and monitor the pressure dispalyed.
When the pressure is set, press the "RESET" button until the normal display is resumed.
3.8
FLUE SYSTEM
NB:
When installing a replacement boiler a
new flue system must be used. Do not
re-use the existing boiler flue installation.
3.8.1
Design
Individual air supply and flue outlet pipes are used.
The material used for flue outlet &/or air inlet must be
muPVC to BS 5255 and/or BSEN1566-1 and
BSEN1329 of an internal diameter of 51 mm. (i.e.
nominal 50 mm diameter muPVC solvent weld waste
pipe)
Alternatively, where flue or air intake lengths of up to
60m are require, Keston Composite 75mm flue and
Installation & Servicing Instructions
The Keston Qudos 28s & Qudos 28sP Boilers
Expansion
Vessel
(if required)
Permanently
Open 28mm
By-pass
Additional System
Pump
(if required)
RETURN
HEATING CIRCUIT
FLOW
Flue Outlet/Air Inlet Terminals
Figure 3.8.1 : Terminals
Page : 17
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