Control Unit - Bosch Worcester Greenstar HIU E Installation And Maintenance Instructions Manual

Replacement of parts
8.12

Control unit

Refer to figure 75
▶ Ensure the power supply to the appliance has been isolated and
secure against unintentional reconnection.
▶ The control box [1] incorporates a hook on the underside to support
the control unit on the plate heat exchanger top bracket [2] whilst
disconnecting the electrical connections on the control unit.
▶ Release the latches [4] using a thin bladed screwdriver. Arrows on
the electrical cover indicate the position where the screw driver must
be inserted to release the catches.
▶ Hinge open the connections cover [3].
▶ Remove the connections cover [3] by releasing the latches [5] using
a thin bladed screwdriver.
1
2
4
6
6
Fig. 75 Control unit replacement
▶ Before the control unit can be replaced, refer to figure 76:
– Unplug connectors from the control unit.
– Remove cables and associated strain reliefs, taking care not to
damaged them.
▶ To refit, follow the above in reverse. Ensure all connectors, strain
reliefs are securely fitted.
Fig. 76 Removing connectors and associated strain reliefs.
58
When re-fitting the cables and associated strain reliefs:
▶ Ensure the power cables and signal cables are replaced in the
appropriate section of the control unit.
3
Fig. 77 Electrical connections
0-30V
[
230V
[
5
6
6720808926-37.1Wo
0-30V 230V
] Low voltage (signal cables) connections side
] Mains voltage (power cables) connections side
6 720 808 928 (2017/06)