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15.4.18. CH Sensor
Remove the inner casing cover.
Carefully pull off the connections and release the clip to remove
the sensor. Apply heat transfer paste to the face of the new
sensor. Refer to Fig 55. Note: If a left-hand flue is fitted then it is
easier to remove the sensor and clip before pulling off the
connections
15.4.19. DHW Sensor
Lower the facia.
Carefully pull off the connections and unscrew the clip to remove
the sensor. Apply heat transfer paste to the face of the new
sensor. Refer to Fig 56.
15.4.20. Boiler Overheat Thermostat
Remove the inner casing cover.
Carefully pull off the connections. Unscrew the thermostat
locknut. Remove the split pin and pull out the phial from the
heat exchanger pocket. Apply heat transfer paste to the phial.
Refer to Fig 57.
15.4.21. CH and DHW Pumps
Lower the facia.
Drain the primary system. Refer to 15.3.1. Pull out the pump
fixing clips and withdraw the pump. Improved access can be
achieved by removing the expansion vessel. Refer to Section
15.4.22. Disconnect the leads at the appropriate pump head.
Refer to Fig 17. Note: There will be a small amount of water still
in the pump body. Refer to Fig 58.
The pump head is a Grundfos 15/60 and may be replaced
leaving the body in place if necessary. Take care not to mark the
mating surfaces if this done. Set to maximum. Refill and
pressurise as described in Section 12.4-8 - Commissioning.
15.4.22. Expansion Vessel
Lower the facia.
Drain the primary system. Refer to 15.3.1. Unscrew the fixing
screw. Release the vessel connection to the system by pushing
the clip upwards and remove the vessel. Note: There will be a
small amount of water in the vessel. Refill and pressurise as
described in Section 12.4-8 - Commissioning. Refer to Fig 39.
15.4.23. DHW Heat Exchanger
Lower the facia.
Drain the primary system and the DHW circuit. Refer to 15.3.1
and 15.3.2.
Carefully unscrew and remove the pipe connections to the heat
exchanger. Release the clips and remove the heat exchanger.
Note: There will be a small amount of water still in the heat
exchanger. Do not strain the pipes when re-connecting them to
the heat exchanger.
Fig 54-Pump Control Board
7
5
1. Pump Control Board
2. X1 Connection
3. Control Panel Pivot Point
4. X3 Connection
1
2
6
3
4
5. X2 Connection
6. Fixing Clip (1)
7. Cable Clamp
Fig 51-System Pressure Switch
1
1. Pressure Switch
Body
2. Micro-Switch
3. Central
Heating Flow
Pipe
4. Union
Connection to
Flow/Return
Manifold
Fig 52-Control Board Mounting Plate Fixing
6
7
5
1. Fixing Srews (4)
2. Mounting Plate
3. Control Panel Pivot Point
4. Facia
5. Pressure Gauge
6. Transformer
Fig 53-Control Panel Fixing
1. Fixing Clips (4)
2. Control Board
3. Mounting Plate
23
2
4
1
2
3
4
Note: Splash guard not shown.
7. Potentiometer
1
2
3
3
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