Worcester GREENSPRING CWi47 Installation And Operating Instructions Manual page 39

B Turning the plastic #40 Torx screw clockwise.
P2 CO levels will increase.
2
Note: This screw adjustment is very
sensitive and should be made in small
increments. It may take several minutes for
readings to stabilize.
Fig. 59 Adjusting P2 CO
2
B Verify both P1 and P2 CO
ranges specified in table 18.
B Repeat steps 1 and 2 as necesssary until CO
are within the specified ranges.
As soon as the levels of CO2 are correct, verify the
values of CO corresponds to the limits of the table 18.
If the values exceed the limits, it is necessary to verify
the ventilation system and heat exchanger.
CO2 range (%)
Natural gas
Max. P1 8.1% - 8.9%
Min. P2 2.0% - 2.6%
Propane
Max. P1 9.2% - 10%
Min. P2 2.0% - 2.6%
Note: Values above are for controlled climate
conditions.
Inputs such as gas pressure, heating value of the gas,
humidity and temperature of combustion air impact
CO and CO values. Changes in these inputs can
2
result in different CO and CO
appliance.
Tab. 18 CO & CO target numbers
2
END OF ADJUSTMENTS
B Record the final values in table 19.
6 720 646 322 (2012/05)
level
readings are within the
2
values
2
Max. CO level
(measured)
< 200 ppm
< 30 ppm
< 250 ppm
< 30 ppm
values on the same
2
Program CO values measured
2
P1 ______________ %
P2 ______________ %
Tab. 19
Reassemble all parts in reverse order:
B Return slotted screw cover to original position and
tighten the philips screw (
B Reinstall Torx protection cover (
B Remove CO analyzer probe and reinstall flathead
2
screw with gasket in exhaust collar.
B Press ON/OFF button to turn OFF the heater.
B Press ON/OFF button to turn ON the heater.
Heater is ready for normal operation.
COMMISSIONING
Date
Fig. 58).
Fig. 59).
39