C.I.B. UNIGAS
- M039213CB
29
10 Only if necessary, change the combusiton head position: to let the burner operate at a lower output, loose the
VB
screw and move
progressively back the combustion head towards the MIN position, by turning clockwise the
VRT
ring nut. Fasten
VB
screw when
the adjustment is accomplished.
Attention!
if it is necessary to change the head position, repeat the air and gas adjustments described above.
11 the air and gas rate are now adjusted at the maximum power stage, go on with the point to point adjustement on the
SV1
(gas
side) adjusting cam as to reach the minimum output point.
12 as for the point-to-point regulation, move the gas low flame microswitch a little lower than the maximum position (90°);
13 set the
TAB
thermostat to the minimum(as far as fully-modulating burners, see related paragraph) in order that the actuator moves
progressively towards the low flame position;
14 move cam III to the minimum to move the actuator towards the low flame until the two bearings find the adjusting screw that refers
to the lower position: screw
V1
to increase the rate, unscrew to decrease.
15 Move again cam III towards the minimum to meet the next screw on the adjusting cam and repeat the previous step; go on this way
as to reach the desired low flame point.
16 Now adjust the pressure switches (see next par.).
Adjustment by the Siemens SQL33.. actuator
1
turn the burner on by setting GAS fuel by means of the burner
CM
switch (it is placed on the burner control panel - see page 38)
2
check the fan motor rotation (see page 23).
3
Start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end;
4
the burner starts up with the actuator on the ignition position, set it to the
MAN
(manual mode), by the
MAN/AUTO
selector (ignition
position= read on the air damper index
ID
);
5
disconnect the
TAB
thermostat removing the wire from the terminal no. 6 or by setting MAN on the RWF40 modulatore or by set-
ting 0 by means of the
CMF
switch (only for fully-modulating burners);
6
set the actuator on the manual mode (MAN) by means of the MAN/AUTO switch (see next pictures).
7
manually drive the adjusting cam
SV1
to the high flame position and set the actuator to the AUTO mode (by the related switch - see
VRA
RA
TR
VRT
VB
“MAX” head position
“MIN” head position
SV1
V1
SV2
RP
PG
SC
Gas throttle valve open
Gas throttle valve closed
Summary of Contents for HR93A
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