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Electrical connections
Thermo 230/231/300/301/350
58
Item Designation
Comment
A1
Heater
A2
Control module
SG 1572 D
B1
Flame sensor
Check polarity
B2
Temperature sensor
Any polarity
B3
Temperature limiter
B4
Thermostat
For nozzle preheating
B5
Thermostat
Alternative to B3
B6
Thermostat
For vertical installation (MV Y1)
E
Filter heater
E1
Heating cartridge
For nozzle preheating
F1
Fuse 25 A
Blade-type fuse DIN 72581 Part 3
F2
Fuse 25 A
Blade-type fuse DIN 72581 Part 3
F3
Fuse 5 A
Blade-type fuse DIN 72581 Part 3
F4
Fuse 25 A
Blade-type fuse DIN 72581 Part 3
F5
Fuse 5 A
Blade-type fuse DIN 72581 Part 3
F6
Fuse 5 A
Blade-type fuse DIN 72581 Part 3
F7
Fuse 5 A
Blade-type fuse DIN 72581 Part 3
H1
Light
Indicator
H2
Light
Flame indicator
H4
Heating symbol on the dis-
play
Power-on indicator (in item P)
K4
Relay
M1
Motor
Combustion air fan
M2
Motor
Circulating pump
P
Digital timer, standard (1531) For programmed operation
S1
Switch
ON/OFF
S3
Switch
External activation
Circulating pump
S4
Switch
Economy mode
S5
Switch
Auxiliary heating mode
S6
Switch
Filter heater on
T
Temperature switch
Filter heater
U1
Ignition spark generator
U2
Ignition electrodes
W1
Wiring harness (1)
W2
Wiring harness (2)
W3
Wiring harness (3)
A
Plug connector, 6-pin
C
Plug connector, 1-pin
D
Plug connector, 4-pin
F
Plug connector, 2-pin
O
Plug connector, 2-pin
Q
Plug connector, 2-pin
X1
Plug connector, 6-pin
X2
Plug connector, 2-pin
X3
Plug connector, 8-pin
X4
Plug connector, 12-pin
X5
Plug connector, 4-pin
X6
Plug connector, 4-pin
X7
Plug connector, 7-pin
Y1
Solenoid valve
Item Designation
Comment
Th23_EA_degbfr_g.book Seite 58 Dienstag, 15. Februar 2005 2:03 14