INSTRUCTIONS FOR COMMISSIONING
SECTION 5
33
CONTROL
AND
ADJUSTMENT
AT FULL
LOAD
Fig. 13
Setscrew s
1. Switch the water heater off and flush system until the tank is completely cooled down.
2. Put the water heater in operation.
3. Press the reset button down for longer than 5 seconds, L appears in the display.
Pressing the reset button again, C00 appears in the display. Press the + button to
select the burner module to be run at full load:
burner module 1
burner module 2
burner module 3
burner module 4
all burner modules simultaneously
burner module 2 not present
Press the reset button to choose the desired burner module. The burner can now function
at full load or low load using the + and - buttons respectively. The actual burner capacity
appears in the display alternately with:
burner module 1 full load
burner module 1 low load
Select full load with the + button, when the actual burner capacity is above 90% the
CO
2
percentage can be measured and set.
4. Measure the CO
2
percentage and compare it with table 1 (page 32). The CO
2
percentage can be adjusted using the
”
Full Load
”
Setscrew (A) on the gas regulation
unit, see Fig. 13.
The CO
2
percentage can be increased by turning the setscrew to the left.
5. Now check the CO
2
percentage at low load.
MAXXflo_Manual_Dec08_QX2 12/1/09 1:13 pm Page 36
Summary of Contents for CWH120/200
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