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REPAIR DBW 2010/2020/300 COOLANT HEATERS
9.1.1.4 COMBUSTION AIR FAN WHEEL, VISUAL
I
NSPECTION
– The fan wheel has to be checked for contamination,
traces of grinding and cracks.
DBW 2010
ONLY:
The clearance between the blower wheel and blower
case must be measured (measurable with a feeler gauge)
at the narrowest point. Clearance = 0.15/-0.05 mm.
Figure 35: Clearance Adjustment - DBW 2010 Fan
DBW 2020/300 ONLY:
– The hub of the impeller has to be checked for cracks
and the cover disc (back wall) as to its stability.
9.2 DISASSEMBLY AND ASSEMBLY
9.2.1 OVERHEAT FUSE, REPLACEMENT
9.2.1.1 REMOVAL
1. Disconnect electrical connection to overheat fuse at
connector block.
2. Turn counterclockwise to remove overheat fuse
(item1, Fig. 36) from dry-well.
9.2.1.2 INSTALLATION
1. Turn overheat fuse clockwise into dry-well until
snug but not tight.
2. Turn out 1/2 turn.
3. Plug connector into connector block.
NOTE: Observe electrical wiring color coding
when making connections.
9.2.2 TEMPERATURE CONTROL THERMOSTAT,
R
EPLACEMENT
9.2.2.1 REMOVAL
1. Disconnect electrical connection to temperature
control thermostat at connector block.
2. Turn counterclockwise to remove temperature
control thermostat (item 2, Fig. 36).
9.2.2.2 INSTALLATION
1. Turn temperature control thermostat clockwise into
bracket until snug.
2. Plug connector into connector block.
Observe electrical wiring color coding when
making connections.
0.15 ± 0.05 mm
(.006 ± .002 inch)
Hexagon nut
DBW 2010
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