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WD420/3/2007
5.1
SEPARATE CH & DHW DEMAND WITH ( OPTIONAL ) WEATHER COMPENSATION
Q28S
BOILER
LOW VOLTAGE CONNECTOR
SOL.
TS
FLOW
DHW
SWITCH
SENSOR
SENSOR
SENSOR
1
2
1
2
1
2
NO
5.2
SEPARATE CH & DHW DEMAND WITH ( OPTIONAL ) DHW SENSOR CONTROL
Q28S
BOILER
LOW VOLTAGE CONNECTOR
FLOW
OPEN
SOL.
TS
DHW
THERM
SENSOR
SENSOR
SWITCH
SENSOR
1 2
1
2
1
2
NO
C
2
Installation & Servicing Instructions
Chapter 4 : Installation
Twin Thermostat Operation with Weather Compensation
ANALOG
OPEN
EXTERNAL
DEMAND
THERM
SENSOR
CH1
0v
C
2
1
1
2
E
Modulation of DHW generation
C.10C.0.09.00.0
EXTERNAL SENSOR
ANALOG
EXTERNAL
DEMAND
SENSOR
CH1
0v
1
1
2
E
The Keston Qudos 28s & Qudos 28sP Boilers
ORANGE
BLUE
M
ORANGE
BLUE
M
ORANGE
BLUE
ORANGE
BLUE
( OPTIONAL )
L
N
E
GREY
BROWN
FROM CH
CONTROLS
CH ZONE
VALVE
GREY
BROWN
FROM DHW
CONTROLS
DHW ZONE
VALVE
C.10C.0.09.00.0
EXTERNAL SENSOR
( OPTIONAL )
L
N
E
GREY
BROWN
FROM CH
M
CONTROLS
CH ZONE
VALVE
GREY
BROWN
FROM DHW
M
CONTROLS
DHW ZONE
VALVE
DHW SENSOR
( OPTIONAL )
TANK
Page : 24
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