Unigas PG70, Manual Of Installation - Use - Maintenance

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CIB UNIGAS - M039191CA
25
22 The low flame position must never match the ignition position that is why cam
BF
must be set 20°- 30° more than the ignition posi-
tion.
NOTE:
to change the low flame position, act exclusively on the actuator cam.
23 Now adjust the pressure switch (when provided - see next paragraphs).
Fully modulating burners
To adjust the fully-modulating burners, use the
CMF
switch on the burner control panel (see next picture), instead of the
TAB
thermo-
stat as described on the previous paragraphs about the progressive burners. Go on adjusting the burner as described before, paying
attention to use the CMF switch intead of
TAB
.
The
CMF
position sets the oprating stages: to drive the burner to the high-flame stage, set CMF=1; to drive it to the low-flame stage, set
CMF=2.
To move the adjusting cam set CMF=1 or 2 and then CMF=0.
To adjust the air rate in low flame and in the intermediate points, proceed as follow.
1
Keep pushed for 5 seconds the EXIT button on the modulator (for further details, see the burner modulator manual); when the LED
with the hand symbol lights up, press the arrow button, driving the actuator to the maximum opening position progressively;
2 stop its stroke when it meets each screw
V
: adjust the air rate by adjusting the
V
screw that matches each bearing.
3 Push the EXIT button to quit the manual mode.
Calibration of air pressure switch (when provided)
To calibrate the air pressure switch, proceed as follows:
z
Remove the transparent plastic cap.
z
Once air and gas setting have been accomplished, startup the burner.
z
During the pre-purge phase o the operation, turn slowly the adjusting ring nut
VR
in the clockwise direction (to increase the adju-
sting pressure) until the burner locks out, then read the value on the pressure switch scale and set it to a value reduced by 15%.
z
Repeat the ignition cycle of the burner and check it runs properly.
z
Refit the transparent plastic cover on the pressure switch.
BF
F
CMF
CMF = 0 stop
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation