Webasto Thermo 50 Installation Instructions Manual page 49

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Circuit diagrams
Item Designation
A1
Heater
A2
Control unit
B2
Temperature sensor
E
Glow plug / flame monitor
F1
Fuse 15 A
F2
Fuse 5 A
F3
Fuse
H1
LED (in item P)
H2
LED (in item P)
H3
Light (in item P)
H4
Light
H5
Light min. 1.2 W
K2
Relay
K3
Relay (in item A3)
M1
Motor
M2
Motor
M3
Motor
P
Timer, digital
S1
Switch for vehicle fan
S2
Switch for vehicle fan
S3
Switch
S4
1 or 2-pin
disconnecting switch
S5
Switch
S6
Switch
S7
Momentary-contact switch Immediate heat button /
X1
6-pin plug connection
X2
2-pin plug connection
X3
2-pin plug connection
X4
2-pin plug connection
X5
2-pin plug connection
46
Comment
Thermo 50
Flat fuse SAE J 1284
Flat fuse SAE J 1284
Fuse same as vehicle fan fuse
(max. 20 A)
Switch-on indicator
Indicator
Display light
Indicator
Switch-on indicator pumping device
For pumping device
Vehicle fan
Combustion air fan
Circulation pump
Vehicle fan
For programmed operation
S1 or S2 depending on vehicle
S1 or S2 depending on vehicle
Immediate heat button
Emergency off switch,
electr. or pneumatic
To pumping device 1
To pumping device 2
remote control
Item Designation
X6
2-pin plug connection
X8
2-pin plug connection
X11
2-pin plug connection
X12
12-pin plug connection
X13
1-pin plug connection
X14
1-pin plug connection
X15
4-pin plug connection
Y1
Metering pump
Y2
Solenoid valve
Y3
Solenoid valve
Thermo 50
Comment
Diagnostics
Timer
Battery isolation switch
Auxiliary power take-off
On / off switch
for pumping device 1
for pumping device 2

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