Worcester 24CDi Installation And Servicing Instructions

11
Fig. 10. Functional flow diagram.
Mains
indicator
On/Off
switch
ST8
(L
S)
ST8
(LR)
ST8
(N
S)
ST1
Centre
Pin
ST15
Pin L
REL 1 REL 3
Pump
Fan
ST1
Centre
Pin
ST15
Pin L
ST1
Pin L
REL 1
REL 3
REL 4
2 SPEED FAN
Pump
Fan
ST12 Pin N
Optional link
Room
thermostat
Transformer
Fuse F2
(1.25A Slow)
Fuse F1
(2A Slow)
N
N
ST12 Pin L
LIVE
IN
green
Electronics
Electronics
Electronics
Electronics
Electronics
InputsOutputs
Spark Indicators
Settings
Regulator valve
CH
demand
indicator
Red
Spark
electrodes
DHW
demand
indicator
Red
Flame
detect
indicator
Red
Main valve Main valve Flow switch CH sensor DHW sensor Air pressure switch Flame sense Overheat cut-off 24V programmer
Reset button
Gas valve mode switch
CH pressure adjust pot
CH Control knob
DHW control knob
Convert AC to low
voltage electronics
Electronics/
microprocessor
(Safety Low Voltage)
24CDi
28CDi 35CDi
II

Worcester 24CDi Specifications

General

Model	24CDi
Output	24 kW
Efficiency Rating	A
Max Working Pressure	3 bar
Central Heating Flow Temperature Range	30 - 80 °C
Fuel Type	Natural Gas
Mounting	Wall Mounted