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WD420/3/2007
5.3
SOLAR CONTROL WITH DHW SENSOR INPUT
Q28S
BOILER
LOW VOLTAGE CONNECTOR
FLOW
OPEN
SOL.
TS
DHW
SWITCH
THERM
SENSOR
SENSOR
SENSOR
1
2
1
2
1
2
C
2
1
NO
4.9
EXCHANGING A BOILER
Before removing an existing boiler add Fernox Supafloc, or equivalent cleaning agent, in
accordance with the manufacturers instructions. Open all radiator valves and fire the
boiler. When the system is fully heated, shut off the gas supply and drain down the central
heating system.
Important
The Qudos 28s and Qudos 28sP condensing boilers contain components which could be
damaged or blocked by grease, dirt or solder etc. It is essential that sludge or scale is
removed from an existing system before fitting the boiler.
The guarantee provided with the Keston Qudos 28s and Qudos 28sP does not cover
damage caused by system debris or sludge.
Connect the new boiler as instructed in this manual and fit in accordance with Sections
4.1 to 4.8
Fill to a pressure of about 2.5 bar. Check the complete system for water soundness. If
leaks need to be rectified using flux or solder the system must be flushed cold again
before proceeding.
Reduce the pressure to the Initial System Design Pressure. Vent the system.
Gas Supply
The complete gas installation up to the boiler gas control valve must be checked for
soundness. BS 6891.
Electrical Installation
Carry out preliminary electrical safety checks, i.e. Earth continuity, Polarity, Resistance to
Earth, Short Circuit and earth loop impedance using a suitable test meter.
Installation & Servicing Instructions
Chapter 4 : Installation
Solar Control
C.10C.0.09.00.0
EXTERNAL SENSOR
( OPTIONAL )
ANALOG
EXTERNAL
DEMAND
SENSOR
CH1
0v
1
2
E
The Keston Qudos 28s & Qudos 28sP Boilers
ORANGE
BLUE
M
SOLAR
PUMP
ORANGE
BLUE
M
SOLAR PANEL
SENSOR
SOLAR PANEL
L
N
E
GREY
BROWN
FROM CH
CONTROLS
CH ZONE
VALVE
GREY
BROWN
FROM DHW
CONTROLS
DHW ZONE
VALVE
DHW SENSOR
TANK
TS SENSOR
Page : 25
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