Coopra 40C Installation Manual

Coopra Advanced Heating Technologies Installation manual E40C
21
4.5. Gas / Air Ratio
(1). Venturi screw – Full load adjustment
Turn the venturi screw anti-clockwise to increase the CO
2
value, clockwise to decrease it.
(2). Gas control screw – Low load adjustment
Turn the screw anti-clockwise to decrease the CO
2
value
on low load, clockwise to increase it.
(3). Cover screw
IMPORTANT !
The exact adjustment has always to be made
using the CO
2
analysing method as described
below.
4.6. Flue gas analysis (CO
2
adjustment)
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
analyser) in the
measurement opening of the
flue tube canal.
Make sure there is sufficient
heat dissipation through the
heating.
CO
2
setting At full load At low load
Natural gas
(G20, G25)
between
8,8-9.4 % CO
2
between
8,2-8,6 % CO
2
Butane (G30) 9,8 % CO
2
9,2 % CO
2
4.6.1. Full load
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).
ATTENTION
VENTURI ADJUSTMENT SCREW !
• Turning the venturi screw clockwise to decrease the
CO
2
value (less gas)
• Turning the venturi screw anti-clockwise to increase
the CO
2
value (more gas)
4.6.2. 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.
ATTENTION
GAS CONTROL ADJUSTING SCREW !
• Turning the venturi screw clockwise to increase the
CO
2
value (more gas)
• Turning the venturi screw anti-clockwise to decrease
the CO
2
value (less gas)
The adjustment with the gas control adjusting screw is
very sensitive. Hardly any turn makes a large change in
the CO2 value.
CHECK THE ADJUSTMENT:
Distance between Venturi-screw and the Top of the
venturi-stud is an indication:
 12.5 mm for natural gas G25
 14.0 mm for natural gas G20
 16,5 mm for LPG gas G30/G31

Coopra 40C Specifications

General

Brand	Coopra
Model	40C
Category	Boiler
Language	English