Draining The Boiler; Siphon Removal; Primary Sensor (Ch Ntc); Maximum Safety Sensor - Worcester 27i System Compact Installation, Commissioning And Servicing Instructions

6.8.2 DRAINING THE BOILER

Many of the tasks in this section require that the boiler be isolate and
drained.
1. Connect a suitable hose firmly to the drain point and run the hose
outside to a suitable point or container.
2. Turn the drain valve a ¼ turn anticlockwise to open the drain. Turn the
valve firmly clockwise to close.
Fig. 83 Draining the boiler

6.8.3 SIPHON REMOVAL

1. Disconnect the discharge hose from the wall frame connector.
2. Rotate the siphon body clockwise to release the bayonet connection.
3. Pull the siphon body down and away from the boiler.
3.
Fig. 84 Syphon removal

6.8.4 PRIMARY SENSOR (CH NTC)

▶ Remove the combustion air inlet pipe from the pre-mix unit, rotate
anti-clockwise and pull away from the fan assembly.
▶ Ease the gas pipe to the left.
▶ Disconnect the lead to the sensor.
▶ Remove the sensor by pulling forward.
▶ Replace the sensor onto the flow pipe.
▶ Connect the lead to the sensor.
▶ Re-fit the combustion air inlet pipe to the pre-mix unit.
Greenstar i System Compact - 6 720 807 726 (2013/05)
¼
2.
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2.
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Fig. 85 Primary sensor

6.8.5 MAXIMUM SAFETY SENSOR

▶ Disconnect the lead to the maximum safety sensor.
1. Remove the screw securing the sensor.
2. Remove the sensor from the heat exchanger.
▶ When replacing the sensor, ensure that the assembly is properly
located on the orientation pin.
Fig. 86 Overheat sensor

6.8.6 FLUE OVERHEAT THERMOSTAT

▶ Disconnect the lead to the flue overheat thermostat.
Take care not to damage the housing when removing the
thermostat.
▶ Using a small screwdriver, gently prise the thermostat from the
housing taking care not to damage the housing or grommet.
Fig. 87 Flue overheat thermostat
▶ To replace, push the thermostat and new grommet gently back into
the opening until contact with the locating ridge is felt.
▶ The Flueway will have to be removed if the thermostat falls into the
housing, refer to section 6.8.9.
SERVICE AND SPARES
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