Operation; Notes On Safety For The First Start-Up; Adjustments Prior To Ignition; Burner Start-Up - Riello 901T Installation, Use And Maintenance Instructions

6

Operation

6.1

Notes on safety for the first start-up

The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
WARNING
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
Before starting up the burner, refer to section
See "Safety test - with no gas supply" on
page 20.
WARNING
6.2

Adjustments prior to ignition

The following adjustments must be carried out:
 Open manual valves up-line from the gas train.
 Bleed the air from the gas line using the screw on the socket
START.
 Check the trimmer settings on the control box (Fig. 14).
6.3

Burner start-up

Close the thermostat and switch on the burner's power.
The burner starts up under pre-purging conditions to the START
and the ignition occurs.
If the fan starts up, but no flame appears by the end of the safety
time, the control box allows the start-up programme to be
repeated up to 2 times.
If ignition does not occur upon the third attempt, the burner goes
into lockout mode. Reset and wait for a new start-up attempt.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 5 seconds.
Turn the screw V1 on the gas valve mixer slightly anticlockwise.
Once the burner has ignited, proceed with the global adjustment
of the burner.
6.4

Fan adjustment

Modulation is based on variable-speed technology. Combustion
air delivery can be adjusted by varying the motor's speed (rpm).
The proportioning gas train delivers the right amount of fuel, de-
pending on the pressure detected in the purging circuit. Hence
the output delivered is adjusted by varying the motor's speed of
rotation. The speed of the motor can be adjusted by means of
three "Trimmers" (Fig. 14).
6.5

Gas valve adjustment

The adjustment of the output of gas is achieved by using the two
screws V1 and V2.
To alter the maximum output of gas act on the screw V1.
– To increase the output: turn the screw V1 anticlockwise (un-
screw).
– To reduce the output: turn the screw clockwise (tighten).
Operation
To alter the minimum output of gas act on the screw V2 on the
gas valve. Remove the protection screw and act on the intern
screws with a hex key.
– To increase the output: turn the screw clockwise (tighten)
– To reduce the output: turn the screw anticlockwise (unscrew)
Definition of the adjustment for the fan:
The adjustments are carried out means on three potentiometers
on board of the motor control box.
START Determine the air during the start
MIN Determine the minimum modulation
MAX Determine the maximum modulation
The adjustment of "MIN" takes place outright at finishing the pre-
purging outlined by the valve opening and by the presence of the
discharge. The authorisation to the maximum modulation with
"MAX" occurs about 10 sec by the valve opening.
D7375
15 GB
Minimum gas flow adjustment
on the stabiliser (V2)
D10505
Maximum gas flow
adjustment (V1)
Fig. 13
Fig. 14
20028767