Spheros thermo 231, Workshop Manual

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9 Repair Thermo 230 / 231 / 300 / 301 / 350
90
4
9.2 Disassembly and Assembly
9.2.1 Temperature Limiter, Replacement
9.2.1.1 Removal
1. Disconnect electrical connection to temperature
limiter.
2. Withdraw rubber cap. Using screw driver lever off
retaining spring and remove temperature limiter
(1, Fig. 901).
9.2.1.2 Installation
1. Slide rubber cap of temperature limiter (1, Fig. 901)
back until temperature limiter can be located for
installation.
2. Position temperature limiter (1) in connector (3) and
push in retaining clip.
WARNING
The retaining spring must be located in the groove of the
housing and must be latched in position both perceptibly
and audibly (twice) at the collar of the locating socket.
Only then will the temperature limiter be in proper contact
with the heat exchanger jacket.
3. Fit rubber cap.
After the rubber cap has been placed in position, the
cable must be aligned in the cable sleeve, free from
strain.
Connection cables must not be routed over reset
button.
NOTE
Observe electrical wiring color coding when making
connections to temperature limiter.
4. Make electrical connections.
9.2.2 Temperature Sensor, Replacement
9.2.2.1 Removal
1. Disconnect electrical connection to temperature
sensor.
WARNING
Prior to replacement of temperature sensor in installed
condition relief overpressure in cooling system by opening
the cooling circuit sealing element.
If required also allow heater to cool down and have
collector vessel ready to collect escaping coolant.
2. Unscrew temperature sensor (2, Fig. 901) and
remove.
9.2.2.2 Installation
1. Manually screw temperature sensor (2, Fig. 901) into
coolant outlet (4).
2. Torque temperature sensor to 20 Nm +5 Nm.
3. Restore electrical connections.
NOTE
Observe electrical wiring color coding when making
connections to temperature sensor.
9.2.3 Burner, Replacement
9.2.3.1 Removal
1. Disconnect electrical connections on burner and
loosen fuel lines.
2. Loosen nuts (6, Fig. 901) until hinge bolts are free.
3. Swing hinge bolts (7) open and remove cotter pin (5).
4. Remove burner (8).
5. Perform procedures on components after
disassembly (refer to 9.1.1).
9.2.3.2 Installation
1. Position burner (8, Fig. 901) for installation, swing
hinge bolts closed and secure temporarily using
screws (6).
2. Insert cotter pin (5) according to the intended opening
swing direction.
3. Tighten nuts (6) with 7.5 Nm + 1 Nm.
4. Connect fuel lines.
5. Restore electrical connections.
NOTE
Observe electrical wiring color coding when making
connections to temperature limiter and temperature
sensor.