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WD420/3/2007
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 available 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
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 qSpa range combine exceptional recovery
times with durable, long life stainless steel construction and all associated
controls. Contact KESTON Heating 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
"T T T T " 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 displayed.
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). Marley muPVC Solvent Weld Waste System
(50mm) and Polypipe System 2000 muPVC Solvent
Weld Waste (50mm) are recommended systems. DO
NOT USE ABS PIPE OR FITTINGS.
Installation & Servicing Instructions
Chapter 3 : Boiler Location
Expansion
Vessel
(if required)
Permanently
Open 28mm
By-pass
Hot Water System (if applicable)
The Keston Qudos 28s & Qudos 28sP Boilers
HEATING CIRCUIT
Additional System
Pump
(if required)
Flue Outlet/Air Inlet Terminals
Figure 3.8.1 : Terminals
RETURN
FLOW
Page : 17
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