Air Shutter Setting; Low Fire Setting; Main Flame Setting - Riello F20 Installation, Use And Maintenance Instructions

AIR SHUTTER SETTING

LOW FIRE SETTING

A) Loosen PRESSURE RELEASING SCREW (1). (One turn is sufficient). This permits the fuel pressure to bleed off
to the pump return port and the burner to operate continuously at the low fire rate.
B) Loosen RETAINING NUT (2).
C) Turn the ADJUSTING SCREW (3) until the top of the air shutter (9) is correctly positioned according to the Burner
Set-up Chart, column 5, on page 10.
D) Use instruments to establish the proper settings for maximum CO
E) Hold ADJUSTING SCREW (3) in position and secure by tightening RETAINING NUT (2).
F) Retighten PRESSURE RELEASE SCREW (1).
Note:
The low fire pressure regulator is pre-set at the factory to 100 PSI (7 bar).
To vary or regulate this pressure it is necessary to attach a pressure gauge to the PRESSURE PORT (6).
Loosen the PRESSURE RELEASE SCREW (1) as in step A above. Regulate the pressure by turning the PRESSURE
REGULATING SCREW (5).
The corresponding pressure can be read on the pressure gauge attached to the PUMP PRESSURE PORT (6).

MAIN FLAME SETTING

A) Be sure that the burner is operating at high fire.
B) Set the pump pressure by attaching a pressure gauge to the Pressure port (6) and adjust the pressure by turning
the pressure regulator adjustment screw (10).
Loosen the RETAINING NUT (7), and turn the BOLT (8) in a counterclockwise direction until about 3/4 of an inch
of thread is visible. Using the setting taken from the Burner Set-up Chart, column 5, position the air shutter (9) so
that the top of the shutter is aligned with the proper index line indicated on the air intake side of the burner housing.
Holding the shutter in this position, turn ADJUSTING BOLT (8) in a clockwise direction until a resistance is met.
C) The final position of the air adjustment plate will vary on each installation. Use instruments to establish the proper
settings for maximum CO
NOTE:
Variations in flue gas, smoke, CO
place. Therefore, the burner cover must be in place when making the final combustion instrument readings, to en-
sure proper test results.
7
8
3
2
2902453
and a smoke reading of zero.
2
and temperature readings may be experienced when the burner cover is put in
2
S7440
and a smoke reading of zero.
2
10
6
9
D1874
9
GB
1 5