Mira Zest 7.5 Installation, Operation And Maintenance Manual page 23

Heater Tank - Removal and Installation
WARNING! Isolate the electrical and water supplies before removing the cover. Mains
electricity connections are exposed when the cover is removed.
1. Remove the three cover retaining screws, the cover and the service tunnel.
2.
Remove the hose from the outlet connector and loosen the connection to the inlet
connector.
3. To improve access to the terminals on top of the tank, the terminal block may be
loosened by removing the fixing screw.
4. Remove the splash guard which is located between the heater tank and the flow
valve and switch assembly.
5. Remove the screws that hold the inlet clamp bracket in position and remove the
clamp bracket.
6. Remove the screws that hold the flow valve and switching assembly and the heater
tank in position.
7. Carefully pull the flow valve, switching assembly and heater tank away from the
case. Make sure that you ease the inlet connector off the inlet supply pipe.
8. Make a note of the positions of the wiring on top of the heater tank.
9. Remove the blue wire from the top of the heater tank.
10. Disconnect the red and black wires from the microswitches.
11. Remove the brown and red wires from one side of the thermal switch and the second
brown wire from the other side of the thermal switch.
Caution! Do not press printed disc on the thermal switch as this will make the
component unserviceable.
12. Remove the fixing screw and remove the thermal switch and green earth bonding
wire.
13. Separate the heater tank from the flow valve and switching assembly.
14. Refit the components in reverse order. Make sure that the electrical wires are installed
in the correct positions.
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