Adjustment Of The Gas Pressure; Checking The Ignition Device - QHT Riva Installation, Operation And Service Instructions

15. Commissioning Cont.
Remove the front
•
panel of the case.
Open the gas valve
•
inlet pressure test
point (16 in Fig. 15.5)
at the valve input,
connect a suitable
pressure gauge and
check the gas
pressure of the supply
network.
Remove the gauge
•
and close the
pressure test point
16.
Open the gas valve
•
outlet pressure test
point (15 in Fig. 15.5)
and connect the
gauge.
F
G
15
16
Figure 15.5
With the burner on high flame close the gas cock. After three ignition attempts (within
about three minutes), the lock-out signal lamp must appear (D on Figure 15.3). To reset
the boiler turn the knob B (figure 15.3) on the 0 position and then press and release the
boiler reset button (C on Figure 15.3).
RIVA HEAT ONLY MANUAL – REV B

15.4 Adjustment of the gas pressure:

Remove the
•
protection cap I (Fig.
15.6) from the
mechanical pressure
adjustment
components levering
with a flat screwdriver
in the slots H.
Start the boiler at its
•
maximum power.
H
Figure 15.6
Ensure that the boiler
•
is not range rated.
Rotate the maximum
•
gas pressure
E
adjustment (F in Fig.
15.5) until you obtain
the required pressure
(by rotating clockwise
the pressure
increases).

15.5 Checking the ignition device:

Turn the boiler off
•
and disconnect one of
the two connectors (E
in Fig. 15.5).
Start the boiler and
•
rotate the minimum
gas pressure
adjustment (G in Fig.
15.5) until you obtain
the required pressure
(by rotating clockwise
I the pressure
increases).
Turn the boiler off and
•
re-connect the wire to
the modulating
operator.
Start the boiler and
•
check again the
maximum gas
pressure setting.
Turn the boiler off and
•
disconnect the gauge.
Important: after the
checks all of the test
points must be sealed.
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