Thermo Pro 90 7 Circuit diagrams
702
Table 3 Legend for wiring diagrams
Item Description Comment
1
Temperature coding D+ signal (vehicle engine ON/OFF) for determination of the control
temperature
2
Standard clock P2 – with ignition (Terminal 15) on connection 10:
Continuous operation with immediate heating and ignition on
– Connection 10 open:
Heating duration is programmable (10 to 120 min.), basic
setting 120 min.
3
Vehicle fuse for vehicle fan
4
Vehicle fan switch
A1 Heater Thermo Pro 90
A2 Control unit
ATS Exhaust temperature sensor PT2000
B4 Room thermostat optional
BA Operation indicator Bulb max. 2 W
BM Burner motor Combustion air fan
DP Metering pump Fuel pump for heater
F1 20 A fuse Flat fuse SAE J 1284
F2 5 A fuse Flat fuse SAE J 1284
F3 20 A fuse Flat fuse SAE J 1284
FZG Vehicle fan
GS Glow plug
H1 “Heating” symbol in the display Operating indicator (in item P2)
H3 Symbol light Bulb (in item P2)
H5 Switch-on indicator pumping device Bulb max. 1.2 W
H6 Illumination of immediate heat button, BA,
switch-on check (in Pos. P2)
Red LED (in Pos. P2)
K3 Relay Circulation pump remote control
K5 Vehicle fan relay
P2 Standard timer For programmed operation
S4 On/Off switch with BA, in place of standard clock
S6 Emergency-Off switch, mechanical or
pneumatic
Isolating switch
S7 Pumping device switch ADR
S8 Immediate heating signal Momentary-contact switch (optional via remote control)
S10 Electronic battery switch
ÜHS Overheating protection Sensor on heat exchanger
UP Circulation pump
WTS Coolant temperature sensor Coolant temperature in coolant circuit
X1 Plug connector, 4-pin Pos. BM to Pos. A2
X2 Plug connector, 2-pin Pos. GS to Pos. A2
X3 Plug connector, 2-pin Pos. DP to Pos. A2
X4 Plug connector, 2-pin Pos. UP to Pos. A2
X5 Plug connector, 2-pin Pos. WTS to Pos. A2
X6 Plug connector, 2-pin Pos. ATS to Pos. A2
X7 Plug connector, 2-pin Pos. ÜHS to Pos. A2
X8 Plug connector, 12-pin Wiring harness, vehicle-specific
X9 Plug connector, 12-pin Pos. P2
X10 Plug connector, 2-pin W bus PC diagnosis
X11 Plug connector, 2-pin to Pos. DP
X12 Plug connector, 2-pin to Pos. UP
Y2 Solenoid valve for pumping device
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