T
HERMO
90 / 90 S
9REPAIR
9-3
9.2.2 Replacement of Circulation Pump
9.2.2.1 Removal
1. Remove heater (see 8.7.1.1).
2. Disconnect electrical connections (see 9.2.1.1).
3. Remove screws (4, Fig. 9-2).
4. Remove clamp (3) and circulation pump (2).
5. Perform procedures on components after
disassembly (see 9.1.1).
NOTE:
One of the newer models Thermo 90 shown.
Older models have the cable of the temperature limiter
located on the side.
Heater Thermo 90 S may have the control unit located
on the combustion air fan not affecting the replacement
of the circulation pump.
9.2.2.2 Installation
1. Apply acid free grease (Vaseline) to gasket
(1, Fig. 9-2)
2. Bring circulation pump (2) in assembly position and
secure using clamp (3) and screws (4).
3. Torque screws (4) to 3 Nm + 10%.
4. Make electrical connections (see 9.2.1.2).
5. Install heater (see 8.7.1.2).
Fig. 9-2 Replacement of Circulation Pump
