Burner Operation; Burner Star-Up; Fan Adjustment; Gas Valve Adjustment - Riello RX 180 S/PV Instructions D'installation, D'utilisation Et D'entretien

Reset button
(A)
Maximum output Start
Minimum output
D7802
9

BURNER OPERATION

ADJUSTMENT BEFORE FIRST FIRING
The following to be made are:
- open the manual valves located upline from
the gas train;
- bleed the air from the gas pipes using the
screw on the socket (page 8).
BURNER START-UP
Close the thermostat and switch on the burner's
power. The burner starts in pre-purging mode at
top speed.
Speed subsequently decreases to the START
value and the burner fires. If however the fan
starts up but no flame has appeared at the end
of the safety period, the burner goes into lock-
out. Reset and wait for a new start-up attempt. If
the burner still does not fire, the problem may be
that gas is not reaching the combustion head
within the 3-second safety time.
Turn screw V1 on the gas valve mixer anticlock-
wise slightly (page 8).
Once the burner has fired, the next step is to
complete the burner's other adjustments.

FAN ADJUSTMENT

Modulation is based on variable-speed technol-
ogy. Combustion air delivery can be adjusted by
varying the motor's speed (rpm).
The proportioning gas train, depending on the
pressure detected in the purging circuit, delivers
the right amount of fuel.
Hence the output delivered is adjusted by vary-
ing the motor's speed of rotation.
Motor speed can be adjusted by means of the
three Trimmers (see figure A).

GAS VALVE ADJUSTMENT

The regulation of the gas delivery is achieved
using the two screws V1 and V2.
To vary the maximum gas delivery turn screw
V1:
- to increase the delivery: turn the screw in an
anticlockwise direction (unscrew);
- to reduce the delivery: turn the screw in a
clockwise direction (screw up).
To vary the minimum gas delivery act on the
screw V2 on the gas valve.
Remove the protective screws and turn the
screw inside with an allen spanner:
- to increase the delivery: turn the screw in
clockwise direction (screw);
- to reduce the delivery: turn the screw in anti-
clockwise direction (unscrew).
Definition of the fan adjustments:
The adjustments are made by adjusting the
three potentiometers on the control box:
START: determines the air in the start phase;
MIN: determines the modulation minimum;
MAX: determines the modulation maximum.