15
20123803
GB
Operation
6.1
Notes on safety for the first start-up
6.2
Adjustments prior to ignition
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 P1 (Fig. 10 on page 13).
6.3
Burner start-up
Close the thermostat and switch on the burner’s power. The burn-
er 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 ap-
peared 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 anticlockwise slightly
(Fig. 10 on page 13).
Once the burner has fired, the next step is to complete the burn-
er’s other adjustments.
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, depending on the pressure detected
in the purging circuit, delivers the right amount of fuel.
Hence the output delivered is adjusted by varying the motor’s
speed of rotation.
Motor speed can be adjusted by means of the three “Trimmers”
(Fig. 13).
6.5
Gas valve adjustment
The regulation of the gas delivery is achieved using the two
screws V1 and V2 (Fig. 10 on page 13).
To vary the maximum gas delivery turn screw V1:
–
to increase the delivery: turn the screw in an anticlockwise di-
rection (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 anticlockwise direc-
tion (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.
6
Operation
WARNING
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
Refer to paragraph “Safety test - with gas ball
valve closed” on page 21 before the first start-
up.
Fig. 12
D7953
Minimum gas flow adjustment
on the stabiliser (
V2
)
Maximum gas flow
adjustment (
V1
)
Summary of Contents for RX35 S/PV H
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