Thermo Pro 90
8 Repairing and replacing components
804
8.8
Coolant temperature sensor
Removal
1. Remove heater (see section 7.5).
2. Unplug electrical connections (see section 8.4).
3. Unscrew coolant temperature sensor (Fig. 806) (13 mm
hexagon) and remove together with O-ring.
4. Complete work on stripped down components (see sec-
Installation
1. Lubricate O-ring (Fig. 904) with acid-free grease (Vase-
line).
2. Screw coolant temperature sensor with O-ring into the
heat exchanger and tighten to
1.5 Nm
±10%.
3. Make electrical connections (see section 8.4).
4. If removed, install heater (see section 7.5).
8.9
Combustion air fan
Removal
1. Remove heater (see section 7.5), depending on space
requirements.
2. Unplug electrical connections (see section 8.4).
3. Remove screws (2x). Detach control unit if necessary.
4. Pull the combustion air fan off the burner head and
remove.
5. Complete work on stripped down components (see sec-
tion 8.3).
NOTE
Make sure that the seal on the combustion air fan is intact
(both sides).
Installation
1. Place the combustion air fan in the assembly position and
secure with screws.
2. Tighten screws (2x) to
3 Nm
± 10%.
3. Fit control unit and reestablish electrical connections (see
section 8.4).
4. If removed, install heater (see section 7.5).
Fig. 806 Coolant temperature sensor removal
Fig. 807 Combustion air fan removal
Fig. 808 Seal on combustion air fan
