Parts Of The Heater; Electronic Control Unit (1); Overheat Fuse (15); Temperature Limiter (17) - Webasto DBW 2010 Service And Repair Manual
Used in combination with the vehicle’s own heating installation to heat the passenger compartment, defrost the windshield, preheat water-cooled engines, in self-contained cargo heating applications
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Also See for DBW 2010:
- Operating and servicing manual (88 pages) ,
- Workshop manual (78 pages) ,
- Operating instructions manual (40 pages)
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GENERAL DESCRIPTION
2.1 P
H
ARTS OF THE
EATER
2.1.1
E
C
LECTRONIC
ONTROL
The control unit SG 1553 in 12 volt and 24 volt versions
is the central component to ensure controlled operation
and monitoring of combustion.
Figure 1:
Control Unit
2.1.2
O
F
VERHEAT
USE
The overheat fuse protects the heater from too high and
inadmissible temperatures. The overheat fuse contains a
fusible link that reacts when the temperature exceeds
138° C (280° F), and switches the heater off with a purge
cycle.
Overheat Fuse (white wires)
Response temperature
138° C (280° F)
Figure 2:
Overheat Fuse
Webasto Product N.A., Inc.
U
(1)
NIT
Control unit
(15)
DBW 2010/2020/300 COOLANT HEATERS
2.1.3
T
EMPERATURE
The temperature limiter is a thermostat that responds
(opens) at a temperature of 95° C (203° F). The
temperature limiter will automatically reset (closes) once
temperature falls well below 95° C (203° F). Once the
limiter has reset, the heater will have to be switched off
and back on to restore operation.
Temperature Limiter (green wires)
Switching temperature
– opens at 95° C (203° F)
Figure 3:
Temperature Limiter
2.1.4
T
EMPERATURE
After the operating temperature has been reached, the
temperature control thermostat opens and shuts off the
heating cycle and a purge cycle begins. Once the
operating temperature drops to the lower temperature
threshold of the control thermostat, the thermostat
closes and another heating cycle begins, thus,
maintaining a consistent coolant temperature.
Temperature Control Thermostat
Version 1 (red and green wires)
– opens at 75 ± 3° C (167 ± 6° F)
– closes at 68 ± 5° C (154 ± 9° F)
Figure 4:
Temperature Control Thermostat
NOTE: DBW 2020/300 Only. An optional
control thermostat could be mounted in the
heating system in place of the control
thermostat located on the heater.
12
L
(17)
IMITER
C
T
(16)
ONTROL
HERMOSTAT
Version 2 (orange and white wires)
– opens at 70 ± 3° C (158 ± 6° F)
– closes at 60 ± 5° C (140 ± 9° F)
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