37
221873B
14.20 Hydro Block Assembly Left hand side
(see diagram 14.18)
Before starting refer to Section 11.
Remove the two screws securing the controls cover door and
controls fascia, see diagram 9.1.
Hinge the assembly open.
Remove the heat exchanger, refer to Section 14.26.
Remove the diverter switch, refer to Section 14.13.
Remove low water pressure switch, refer to section 14.11.
Disconnect the pressure differential micro switch inline electrical
connector, refer to Section 14.18.
Unplug gas control valve multi pin connector.
Remove securing pins 1,2 and 3, see diagram 14.18.
Remove the plate to plate heat exchanger, refer to Section14.23.
Remove the bypass tube refer to Section 14.22
Remove the left hand side of the hydro block.
14.21 Hydro Block Assembly Right hand side
(see diagram 14.18)
Before starting refer to Section 11.
Remove the two screws securing the controls cover door and
controls fascia, see diagram 9.1.
Hinge the assembly open.
Remove the heat exchanger, refer to Section 14.26.
Remove the diverter switch, refer to Section 14.13.
Disconnect the domestic hot water micro switch inline electrical
connector, refer to Section 14.19.
Unplug gas control valve multi pin connector.
Remove securing pins 4,5 and 6, see diagram 14.18.
Remove the plate to plate heat exchanger, refer to Section
14.23.
ELECTRICAL
PLUG
7019a
PRESSURE
DIFFERENTIAL
MICRO SWITCH
Diagram 14.18
HYDRO BLOCK
ASSEMBLY
DIVERTER
SWITCH
SECURING
PIN 1
14 Replacement of Parts
SECURING
PIN 6
SECURING
PIN 4 and 5
SECURING PIN
2 and 3
DOMESTIC
HOT WATER
MICRO SWITCH
LOW WATER
PRESSURE SWITCH
DOMESTIC HOT
WATER THERMISTOR
PUMP
FILTER
7077
PLUG
GAS CONTROL
VALVE MULTI PIN
CONNECTOR
Remove the bypass tube refer to Section 14.22.
Remove the right hand side of the hydro block.
See inset on diagram 14.18 to remove heating return filter.
14.22 Bypass Tube/Valve
Remove the diverter switch, refer to Section14.13.
Remove the plate to plate heat exchanger, refer to section
14.23.
Remove the bypass tube by removing the two securing pins,
see Diagram 14.19.
Remove the bypass valve, see diagram 14.20.
14.23 Plate to Plate Heat Exchanger
Before starting refer to Section 11.
Remove the two screws securing the controls cover door and
controls fascia, see diagram 9.1.
Hinge the assembly open.
Remove the securing screws to release the plate to plate heat
exchanger, see diagram 14.21.
Remove the diverter switch, refer to Section14.22.
Push it out, tilt and remove, see diagram 14.21.
When re-fitting it will only fit one way.
14.24 Expansion Vessel
Before starting refer to Section 11.
Renewal of the expansion vessel requires the boiler to be
removed from the wall. As an alternative, a separate expansion
vessel of the same specification may be connected as close as
possible to the boiler, leaving the original in position, refer to the
Installation Instructions.
Disconnect the boiler water connection union nuts at the front
of the isolating valves, see 6.1.
LEFT
HAND
RIGHT
HAND
RETAINING CLIP
