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JK
Blk
Blk
Gry
Gry
Pnk
Pnk
Pnk
Gry
Gry
Wh
Wh
Wh
Wh
Wh
Wh
Wh
Rd/Blk
Rd/Blk
Rd/Blk
Blk
Blk
Blk
Brn
Brn
Brn
Brn
Blk
Blk
2.12 ELECTRICAL DIAGRAM
13
LEGEND:
A = Time Clock Connector
B = Central Heating Selection (Winter) and
Temperature Adjustment
C = Connector for Total Check System
D = Domestic Hot Water Temperature Adjustment
E = Soft-light Adjustment
F = Maximum Heating Adjustment
G = On/Off Switch
H = On/Off L.E.D.
I = Fume Sensor L.E.D.
J = Ignition Failure (Lockout) L.E.D.
K = Low System Water Level/Lack of Circulation L.E.D.
L = Reset Button
M = Economy/Comfort Selector
N = Overheat L.E.D.
O = Temperature L.E.D.s
P = Transformer
Q = Circulation Pump Relay
R = Fan Relay
S = Gas Valve Relay
T = Motorised Diverter Valve Relay
V = Spark Generator
U = Anti-cycling Device Adjustment for Heating
A01 = Circulation Pump
A02 = Fan
A03 = Spark Generator/Gas Valve Supply
A04 = Motorised Diverter Valve
A05 = Flame Detection Circuit
A06 = Detection Electrode
A07 = Main Circuit Temperature Probe
A08 = Domestic Hot Water Temperature Probe
A09 = Domestic Hot Water Flow Switch
A10 = Main Circuit Flow Switch
A11 = Modulator
A12 = Air Pressure Switch
A13 = Safety Thermostat
A14 = External (Room) Thermostat
Colours:
Gry = Grey
Wh = White
Pnk = Pink
Brn = Brown
Bl = Blue
Blk = Black
Rd/Blk = Red/Black
FIG. 2.12
SE017A