- 11 -
GAS CONVERSION
B
23
chimney flue:
- Combustion control is carried out after making a
hole on the combustion product outlet system ex-
ternal and directly at the boiler outlet (with the boi-
ler unit assembled). This opening must be closed
again after checking.
C
13
- C
33
balanced flue:
- Combustion control is carried out through the
opening (23) provided for this purpose after the
cap is removed. This opening must be closed
again after checking.
- To commission the burner:
• Activate the regulator shut-down function - ser-
vice key (6) (section 3.11 - page 19 -
chapter III - OPERATION - INSTALLATION
MANUAL) :
. the code flashes on the dis-
play screen (13),
- Gradually position the d.h.w. potentiometer (3) to
the maximum on the right:
• the burner switches to max. rate,
- Gradually move the V or 1 adjustment screw of
the gas unit (fig. 5 - page 10 - SERVICING MA-
NUAL) to obtain a stable flame.
-Check the CO
2
/CO ratio (see setting table
section 2.2 - page 12 - chapter II - GAS CON-
VERSION - SERVICING MANUAL),
- Set the d.h.w. potentiometer (3) to the maximum
on the left:
• the burner switches to the minimum rate,
-Check the CO
2
/CO ratio (see setting table
section 2.2 - page 12 - chapter II - GAS CON-
VERSION - SERVICING MANUAL),
- If necessary:
• adjust screw K or 2 (fig. 5 - page 10 - SERVI-
CING MANUAL) (tightening and untightening
increases and decreases gas flow).
Before starting the minimum rate set-
ting (V or 1 and K or 2 screws), wait for
a stable CO
2
/CO analyser read-out.
Repeat switching from the minimum
rate to the maximum rate several times
to ensure that the setting has been
done properly.
- to return to normal operation, press on the sweep
key (rep. 6) for 3 seconds then release it.
Note:
- Remember to reposition the d.h.w. potentiometer
(3) to its initial value to return to the required
d.h.w. setting.
2.1 - Surveillance procedure
THI-130-0
23
THI-126-0
23
Fig. 6
!
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