To Gain Access To The Electrical Control Components; To Remove The Distribution Block; To Remove The Fan; To Remove The Pressure Switch - Valor COSYFLAME TURBOCHIM 528 Installer's Manual

To Gain Access to the Electrical Control Components

• Remove the burner unit as described above.
• Detach the control unit from the fire box (left hand side) flange by removing
two screws (see figure 50). Carefully withdraw the unit.
• Detach the fan wiring loom connection. (see figure 51).
• The control unit can be pulled forward as far as the slack in the mains lead
will allow. Do not stress the mains lead.
• When replacing the unit make sure that all the leads are correctly and firmly
connected (see wiring diagram figure 29), and that no leads are trapped.

To Remove the Distribution block

• See section "To Gain Access to the Electrical Control
Components" above .
• Remove the two screws fixing the block to the control
bracket.
• Disconnect the earth lead from the control bracket.
• Disconnect the two leads (Brown & blue) from the
mains cable connection block. (See figure 51)
• Replace in the reverse order. Make sure that all the
leads are correctly and firmly connected (see wiring
diagram figure 29) and that no leads are trapped.

To Remove the Fan

• Remove the terminal guard basket, and then the weather shield and front
plate of the fan box (2 screws).
• Disconnect the wiring loom connector at the fan motor casing.
• Withdraw the fan unit from the fan box taking care not to snag or damage
the wiring loom. (See figure 52).
• Replace in reverse order.

To remove the pressure switch

• Access to the pressure switch is gained by first removing the fan. (See
preceding text - fan removal procedure).
• Disconnect the wiring loom to pressure switch connector.
• Remove the two pressure switch fixing screws, and carefully prise free
the two rubber sensing tubes whilst withdrawing the pressure switch
from the fan box. Note : Ensure that the tube ends secured to the metal sensing
pipes at the back of the box are not disturbed. Refer to figures 22 & 23 in
section "Fan box installation".
•
Replace in reverse order.
When replacing...
1. Ensure that the vacuum tubes are connected to the correct sensing
points. The positive sensing point (⊕ marked on the switch) runs to the
metal sensing pipe positioned nearest to the side of the fan box. Note :
When fitted correctly, both leads will run neatly, but if incorrectly fitted,
they will twist across each other.
2. Ensure the electrical connector is correctly and firmly connected.

Pressure switch strip down

• Remove the cover from the pressure switch to gain access. (See figure 53).
• Disconnect the three leads, yellow, orange and white.
• Replace in reverse order. Ensure that all three leads are firmly connected
Fig. 50
Fig. 51
Fig. 52
Fig 53
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