Webasto DBW 46 Repair Manual download pdf (Page 42)

Webasto Thermo & Comfort N.A., Inc. 42 www.techwebasto.com

CIRCUIT DIAGRAMS DBW 2010/2020/300 COOLANT HEATERS

7.8 CONTROL UNIT - IDENTIFICATION OF TERMINALS

CONNECTOR BLOCK A

A1 (–) coolant circulating pump

A2 (+) coolant circulating pump

ONNECTOR BLOCK B

B1 (+) On/Off switch with low voltage protection

B2 (–) Battery negative

B3 (+) Control light (Operation indicator)

B4 (+) Battery positive

B5 (+) Optional coolant pump control input

B6 (–) Control light (Operation indicator)

ONNECTOR BLOCK C

C1 (+) To temperature control thermostat*

C2 (+) To Blower motor

C4 (+) To overheat fuse, temperature limiter and

fuel solenoid valve

C5 (–) For all heater components

C6 (–) Flame detector

C7 (+) From normally closed control thermostat

C8 (+) To ignition coil

* Control thermostat with white and orange wires.

Closes at 60 ± 5° C (140 ± 9° F)

Opens at 70 ± 3° C (158 ± 6° F)

* Control thermostat with red and green wires.

Closes at 68 ± 5° C (154 ± 9° F)

Opens at 75 ± 3° C (167 ± 6° F)

Figure 33: Control Unit - Identification of Terminals

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Webasto DBW 46 Repair Manual Page 42