Commissioning
44
MAXXflo EVO
• Ensure that the DHW temp 1 is below 40
O
C at all times during the commissioning . Draw off water to
maintain the tank temperature below this value. The temperature can be checked on the home page of
the appliance display at any time.
• Once ignition is successful, allow at least three minutes for the heat engine to warm up fully before
checking the combustion.
• Ensure the DHW tank temperature remains below 40
O
C and with the heater door open, the CO
2
combustion figure for G20 will be as follows:
• If adjustment is required, remove dust cover of gas valve throttle adjustment screw and insert a 4mm
allen key or medium flat blade screw driver to adjust.
MAKE ADJuSTMENTS IN 1/8 TuRN STAGES AND wAIT ONE MINuTE bETwEEN EACH
ADJuSTMENT
CAuTION
If you are experiencing CO readings that exceed 200ppm after 20 minutes of burner operation,
please first check that your gas analyser is functioning correctly and then contact Andrews Water
Heaters on the customer support number given on the rear cover of this manual, for advice
.
• When adjustments are complete, turn the operation switch to STANDBY then ON then STANDBY then
ON then STANDBY. This will cancel the temporary recharging function. Wait for the heater to stop before
proceeding
• Remove the gas analyser and replace the rubber bung in the flue sample point
• Replace the throttle screw cover
Models
CO
2
Maximum CO
expected
Throttle screw
depth (mm)
MAXXflo EVO 90
9.1% (+/- 0.2%)
130
11.6 (+/- 1.0mm)
MAXXflo EVO 120
9.3% (+/- 0.2%)
160
11.7 (+/- 1.0mm)
CO
2
_
+
CO
2
Throttle screw
adjuster
Cascade temp
62.9
o
C
DHW temp 1
56.8
o
C
