Fault Finding And Diagnosis; Internal Wiring Diagram - Worcester Greenstar 25Si Compact Installation, Commissioning And Servicing Instructions

8

FAULT FINDING AND DIAGNOSIS

8.1

INTERNAL WIRING DIAGRAM

FAN
1
N L
GAS
VALVE
Red
G/Y
Blue
Orange
4
5
EMS
CH TEMPERATURE
CONTROL
LCD DISPLAY
X7
13
13
Greenstar Si Compact ErP - 6 720 813 278 (2015/07)
Fan wiring:
Live = Brown
Neutral = Blue
2
FLOW
NTC
SAFETY
SOLENOID
SAFETY
SOLENOID
RETURN
NTC
7
PUMP SUPPLY
PRE WIRED LINK
DHW
NTC
230V
FR FS LR LR
OUT
N L N L
Worcester 24V controls point
HCM (at rear of PCB)
X6 X5
13 1
1 13
14
2
8 3
11
6 9
12 10
FLUE
STAT
SPARK
ELECTRODES
FLAME SENSE
ELECTRODE
15
MAX SAFETY NTC
FLAME SENSE
14
GROUND
6
PUMP
PUMP CONTROL
FLOW
TURBINE
DHW INLET NTC
(PREHEAT OPTION)
12
Fuse, slow
230V
F 5A H 230 V
IN
N L N L N L
EMS BUS point
X3 X11 X4
1
15
1
7
4
1
4
FAULT FINDING AND DIAGNOSIS
AIR PRESSURE
SWITCH
13
3
DIVERTER
VALVE
11
9
10
DHW TEMPERATURE
CONTROL
DIAGNOSTIC
INPUT
X12
5
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