Installation manual

Coopra Advanced Heating Technologies Installation manual 40 EN
17
Pre-adjustment to be done in voltage-free
condition:
- LPG GAS – Turn venturi-screw clockwise 3
completely down on its seat.
Then turn the venturi screw anti-clockwise 4 for
1/2 complete turns.
- N
ATURAL GAS – Turn venturi-screw clockwise 3
completely down on its seat.
Then turn the venturi screw anti-clockwise 4 for
3 complete turns.
With a vernier callipers the distance between venturi-screw
(1) and the Top of the venturi-stud (1) has to be measured to
find the rough setting of the venturi screw for full load, and
depending of the used gastype.
The exact adjustment of the setting has to be made using the
CO
2
analysing method as described below.
4.8. Gas / Air adjustment ( CO
2
analysing)
The gas control is set in the factory to the type of gas to be
used. This type of gas is stated on the packing and on the
identification plate. To check the setting, you have to make a
flue gas analysis.
Proceed as follows
Remove the measuring cap
from the flue tube.
Fit the measurement probe of a
flue gas analyser (CO
2
meter)
in the measurement opening of
the flue tube canal.
Make sure there is sufficient
heat dissipation through the
heating.
CO
2
setting
At full central
heating load
(P=100%)
At low load
Natural gas
(G20, G25)
8,8 % CO
2
8,2 % CO
2
Propane (G31) 9,8 % CO
2
9,2% CO
2
4.8.1. Full load
The burner has to burn at maximum central heating capacity
(Menu setting P=100%).
Activate the chimney sweeper function on full load.
Read the CO
2
value on the
analyser. If the value does not
correspond with the value in
the "CO
2
setting" table,
carefully adjust the venturi
screw (1). Turn the venturi
screw anti-clockwise to
increase the CO
2
value,
clockwise to decrease
it.
4.8.2. Low load
Activate the chimney sweeper function on low load
Read the CO
2
value on the
analyser. If the value does not
correspond with the value in
the "CO
2
setting" table,
carefully adjust the gas control
adjusting screw (2). To do this,
temporarily remove the cap (3)
with the aid of a Torx
screwdriver. Turn the screw
anti-clockwise to decrease the CO
2
value on low load,
clockwise to increase it
.
At the end of the flue gas analysis, set the central heating
capacity (P) in the menu again to the value that is best suited
for the application.
4.9. Placing the jacket
Place the jacket in the appropriate hooks at the top of
the unit. Let the jacket pivot until it falls over the unit.
Tighten the fastener at the bottom of the jacket.
PRE- ADJUSTMENT MEASUREMENT:
Distance between Venturi-screw (1) and the Top of the
venturi-stud to be about:
9 12 mm for natural gas G25
9 14 mm for natural gas G20
9 16 mm for LPG gas G31