QHT RIVA FP Service Instructions Manual page 44

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Third Part
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C Check of the venturi device
This test must be carried out with the sealed
chamber closed.
1) Remove the caps of the pressure test points
located on the top of the boiler and connect a
differential pressure gauge (Figure 4).
2) Switch on the boiler.
3) Compare the value on the gauge with the
following minimum value: 0,64 inwc.
3 Removal of the Fan
1) Remove all the case panels and the sealed
chamber lid.
2) Disconnect the connectors D and E (Figure 2).
3) Disconnect the pipe F which connect the
venturi device to the pressure test point
(Figure 2).
G
4) Unscrew the screws G (Figure 5).
5) Remove the fan by sliding it to the right.
6) Re-assemble the fan carrying out the removal
operations in reverse sequence.
Warning: Re-assembling the fan ensure that
the hooks around the inlet port of
the fan hung correctly on the flue
hood.
Warning: To correctly connect the venturi
device to the Air pressure switch,
refer to Figure 6.
RIVA FP SERVICE MANUAL - REV A RIVA FP SERVICE MANUAL - REV A
(edition-0106)
Figure 4
G
Figure 5
Fan, Venturi Device and Air Pressure Switch
4 Inspection and Removal of the
Venturi Device
1) Remove all the case panels and the sealed
chamber lid.
2) Remove the fan.
3) Remove the venturi device by unscrewing the
screw H (Figure 7).
4) Inspect the venturi device B and the
connection pipe I. Ensure they are clean.
5) Re-assemble the parts in reverse order of
removal.
5 Removal of the Air Pressure Switch
1) Remove all the case panels and the sealed
chamber lid.
2) Disconnect the wires from the Air pressure
switch.
3) Remove the pipe from the Air pressure switch.
4) Unscrew the screws which hold the Air
pressure switch to the frame.
5) Assemble the Air pressure switch carrying out
the removal operations in reverse sequence.
Warning: To correctly connect the Air
pressure switch, refer to Figure 6 and Figure
3 for the correct wiring.
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Figure 6
B
H
I
Figure 7
13-2