9
REPLACEMENT OF COMPONENTS
27
9.11 LOCK-OUT RESET SWITCH
1 Ensure that the electricity supply has been isolated.
2 Open the upper front panel (hinges to the left) to gain access.
3 Remove the four screws securing the control box top cover. Slide the cover back and up to remove it from
the control box.
4 Disconnect the electrical leads from the reset switch.
5 Squeeze together the locating tabs around the back and push it out of the fascia.
6 Push in a replacement switch from the front, ensuring it is located correctly in the fascia.
7 Connect the electrical leads to the new switch as follows:-
White to Terminal 1, Green to Terminal 2, Blue to Terminal 3
8 Replace the control box cover, ensuring the front return edge is located under the front panel return, and
secure with four screws.
9 Test the boiler as described in section 7.5, paragraphs 1,2 and 3.
9.12 TEMPERATURE CONTROL POTENTIOMETER
The heating and hot water temperature control potentiometers (both the same) are located on the back of
the control panel fascia.
1 Ensure that the electricity supply has been isolated.
2 Open the upper front panel (hinges to the left) to gain access.
3 Remove the four screws securing the control box top cover. Slide the cover back and up to remove it from
the control box.
4 Pull the control knob off the potentiometer spindle and disconnect the electrical leads, noting their
position.
5 Note which way the potentiometer is fitted, then remove the nut securing it to the fascia. Fit a new
potentiometer in the same orientation and secure in position. Reconnect the leads - refer to the wiring
diagram, page 34, for electrical connections.
6 Replace the control box cover, ensuring the front return edge is located under the front panel return, and
secure with four screws.
7 Test the boiler as described in section 7.5, paragraphs 1,2 and 3.
9.13 SWITCHES
The same procedure applies to both the on/off and summer/winter switches (the switches are not the same).
1 Ensure that the electricity supply has been isolated.
2 Open the upper front panel (hinges to the left) to gain access.
3 Remove the four screws securing the control box top cover. Slide the cover back and up to remove it from
the control box.
4 Disconnect the electrical leads from the back of the switch, noting their position.
5 Squeeze together the locating tabs on the back of the switch and push it out of the fascia.
5 Push in a replacement switch from the front, ensuring it is the correct way round (green light at bottom
right) and connect the electrical leads - refer to the wiring diagram, page 34, for electrical connections.
6 Replace the control box cover, ensuring the front return edge is located under the front panel return, and
secure with four screws.
7 Test the boiler as described in section 7.5, paragraphs 1,2 and 3.
9.14 MAIN DRIVER BOARD
The main driver board is positioned in the centre of the control box.
1 Ensure that the electricity supply has been isolated.
2 Open the upper front panel (hinges to the left) to gain access.
3 Remove the four screws securing the control box top cover. Slide the cover back and up to remove it from
the control box.
4 Carefully lift the board off its mounting pillars (one each corner).
2 Remove the leads from the terminal blocks (noting their position) and unplug all the wiring connections
from the circuit board.
Summary of Contents for RIO 140
Page 33: ...10 WIRING DIAGRAMS 33 10 1 ILLUSTRATED WIRING DIAGRAM ...
Page 34: ...10 WIRING DIAGRAMS 34 10 2 FUNCTIONAL FLOW WIRING DIAGRAM ...
Page 35: ...11 SEQUENCE OF OPERATION CHARTS 35 11 1 AUTOMATIC IGNITION SEQUENCE ...
Page 36: ...11 SEQUENCE OF OPERATION CHARTS 36 11 2 OPERATION IN CENTRAL HEATING MODE ...
Page 37: ...11 SEQUENCE OF OPERATION CHARTS 37 11 3 OPERATION IN DOMESTIC HOT WATER MODE ...
Page 47: ...NOTE 47 ...
Page 54: ...6 ELECTRONIC TIMER Description of controls see Figs 3 and 4 ...
