INSTRUCTIONS FOR COMMISSIONING
SECTION 5
34
CONTROL AND
ADJUSTMENT AT
LOW LOAD
DECOMMISSIONING
1. Select low load with the - button. When the actual burner capacity is above 25% the
CO
2
percentage can be measured and set.
2. Measure the CO
2
percentage and check it against table 1 (page 32). The CO
2
percentage can be adjusted using the
”
Low Load
”
Setscrew (B) (2mm Alan Key) on the
gas regulation unit, see Fig. 13. The CO
2
percentage can be increased by turning the
setscrew to the right.
3. Check the CO
2
percentage at full load again, if there is another adjustment at full load
check it at low load again.
4. Press the reset button. A new burner module can now be selected using
the + and - buttons. The heater is brought into operation again by repeatedly pressing
on the - button until C00 appears in the display. Press the reset button again and the
display switches back to normal.
NB: IF THE UNIT IS LEFT IN THE COMMISSIONING MODE BY MISTAKE, AFTER 10
MINUTES THE SOFTWARE WILL AUTOMATICALLY SWITCH THE APPLIANCE BACK TO
NORMAL OPERATION.
Turn the electricity supply off. Then turn off the gas tap in the supply pipe. The water
heater must be empty when there is a risk of freezing. Please note: if the electricity supply
remains switched off for a long period the self test of the control no longer works. This
happens once every 24 hours and activates pumps momentarily to prevent the pumps
from sticking, amongst other things.
MAXXflo_Manual_Dec08_QX2 12/1/09 1:13 pm Page 37
Summary of Contents for CWH120/200
Page 43: ......
