Adjusting The Combustion Head - Unigas RX90 Installation Manual

To move the adjusting cam set CMF=1 or 2 and then CMF=0.
CMF

Adjusting the combustion head

Burner is factory-set according to its combustion head model.
Attention! If it is necessary to change the head position, repeat the air and gas adjustments described at staps 1-9 in
paragraph related to air/fuel ratio adjustments according to the actuator model.
Attention (RX515-520):before adjusting the combustion head, turn the burner off and wait until it gets cold. When chan-
ging the nozzles position, pay attention that the smallest holes are always directed inwards, otherwise rotate the nozzle as
to adjust them. Remeber to fasten V1 and V2 srews.
RX90-RX91-RX510: The burner is factory-set with the head in its "all-ahead" position, as for the minimum output. To operate at a

higher power, loosen the VB screw and slightly move the combustion head backwards, by screwing the VRT screw. Fasten VB
screw when the adjustment is accomplished.
RX515-RX520: the combustion head is factory-set according to the values mentioned below.

There are six nozzles: two are in touch with the diffuser and are diametrically opposite, four are placed at 10mm from the diffuser edge
(see picture above).
Nozzles are factory set in order that:
RX515: the two attached to the diffuser lean out 42mm from the diffuser edge, the other four lean out 62mm.
RX520: the two attached to the diffuser lean out 45mm from the diffuser edge, the other four lean out 64mm.
CMF = 0 stop at the current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
VB
VRT
10
36
"all-ahead" position
"all-backwards" head position
n.4 @
10 mm
attached
n.2