9REPAIR
T
HERMO
90 / 90 S
9-10
9.2.8 Replacement of Heat Exchanger
9.2.8.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove circulation pump (see 9.2.2.1).
3. Remove temperature limiter (see 9.2.3.1).
4. Remove temperature sensor (see 9.2.4.1).
5. Remove combustion air fan (see 9.2.5.1).
6 Remove burner, flame sensor, and glow pin
(see 9.2.6.1).
7. Remove burner head (see 9.2.7.1).
8. Remove connector and connector housing.
9. Perform procedures on components after
disassembly (see 9.1.1).
9.2.8.2 Installation
1. Clip connector housing onto heat exchanger and
engage connector in connector housing.
2. Install burner head (see 9.2.7.2).
3. Install burner, flame sensor, and glow pin
(see 9.2.6.2).
4. Install combustion air fan (see 9.2.5.2).
5. Install temperature sensor (see 9.2.4.2).
6. Install temperature limiter (see 9.2.3.2).
7. Install circulation pump (see 9.2.2.2).
8. Install heater (see 8.7.1.2).
