Thermo 90 S / Thermo 90 ST 9Repair
903
9.2.2 Changing the circulating pump
9.2.2.1 Removal
1. Remove the heater (see 8.7.1.1).
2. Disconnect the electrical connections (see 9.2.1.1).
3. Remove the screws (4, Fig. 902).
4. Remove the clip (3) and circulating pump (2).
5. Complete the work on stripped-down components
(see 9.1.1).
9.2.2.2 Installation
1. Apply acid-free grease (Vaseline) to the sealing ring
(1, Fig. 902).
2. Place the circulating pump (2, Fig. 902) in the
assembly position and attach with the clip (3) and
screws (4).
3. Tighten the screws (4) to 3 Nm ±10%.
4. Connect the electrical connections (see 9.2.1.2).
5. Install the heater (see 8.7.1.2).
Fig. 902 Changing the circulating pump
NOTE
A Thermo 90 ST heater is shown. In the Thermo
90 S heater, the control unit can also be
arranged on the combustion air fan without
having any effect on changing the circulating
pump.
1 Sealing ring
2 Circulating
pump
3 Clip
4 Screw (2)
1
2
3
4
