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2.11 Electrical Diagram
B023
Legend:
AT = High Voltage P.C.B.
BT = Low Voltage P.C.B.
B
= Flame Failure L.E.D.
C
= Insufficient Water Pressure L.E.D.
D
= Water Temperature Indicator L.E.D.s
E
= Overheat Thermostat Warning L.E.D.
F
= System Reset Button
G
= Selector Knob for Operating Mode
H
= Domestic Hot Water Temp. Adjustment
I
= Central Heating Temp. Adjustment
J
= Wire Connector for Room Thermostat
K
= Connector for Total Check System
M
= Anti-cycling Device Adjustment for Heating
N
= Soft-light Adjustment
O
= Max Heating Temperature Adjustment
P
= Time Clock Connection
Q
= On/Off L.E.D.
R
= On/Off Switch
S
= Interface Wire for P.C.B.s
T
= Relay Motorised Valve
U
= Ignitor Relay
V
= Gas Valve Relay
W = Fan Relay
X
= Circulation Pump Relay
Aa = Adaptor (British Gas use only)
Y
= Selector TCS2
A01 = Air Pressure Switch
A02 = Fan
A03 = Gas Valve
A04 = Ignitor
A05 = Motorised Valve
A06 = Circulation Pump
A07 = Flame Detector
A08 = Earth Terminal
A09 = Flame Detection Circuit
A10 = Flame Indicator L.E.D.
A11 = Transformer
A12 = Filter
B01 = Over Heat Thermostat
B02 = Room Thermostat
B03 = Gas Valve Modulator
B05 = Heating Sensor
B06 = Pressure Switch for Heating Circuit
B07 = Microswitch for Diverter Valve
Colours
Gry
= Grey
Rd
= Red
Bl
= Blue
Grn/Yll = Yellow/Green
Wh
= White
Brn
= Brown
Blk
= Black
Wh/Rd = White/Red
15
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