Saunier Duval EnviroPlus F24e Instructions For Use Installation And Servicing page 44

Adjustment of the CO at minimum rate is very coarse so
2
carefully adjust the CO with the offset adjustment to 8.3%, see
2
diagram 13.9.
Rotate the service potentiometer fully clockwise, see diagram
13.8 and recheck the maximum rate combustion, which should
be 9.3% ± 0.2%.
After checking combustion rotate the service potentiometer
fully anti-clockwise so that the display indicates the water
temperature.
Replace the cap on the test point and refit the control cover front
panel.
13.7 (F24e & F28e ONLY) Domestic Cold Water
Filter
If the water flow rate through the appliance has reduced it may
be necessary to clean or replace the filter.
Turn off the electrical supply to the boiler.
Refer to section 13.10 and drain the domestic hot water circuit.
Undo the plug which holds the filter in its housing and remove
the filter to clean or renew if necessary, see diagram 13.10.
Replace the filter into its housing and replace plug.
Open the cold water isolating valve and test the Domestic Hot
Water circuit for soundness.
Check for leaks.
13.8 (F24e & F28e ONLY) Domestic Cold Water
Inlet Filter
If the water flow rate through the appliance has reduced it may
be necessary to clean or replace the filter.
Turn off the electrical supply to the boiler.
Refer to section 13.10 and drain the domestic hot water circuit.
Undo the union nut which holds the filter in its housing and
remove the filter to clean or renew if necessary, see diagram
13.11.
Open the cold water isolating valve and test the Domestic Hot
Water circuit for soundness.
Check for leaks.
USER
INTERFACE
PCB
SERVICE
POTENTIOMETER
2000225294A
13 Servicing
MIN.
Diagram 13.8
MAX.
OFFSET
ADJUSTMENT
PIPE ASSEMBLY
(F24e & F28e ONLY)
DOMESTIC
COLD WATER
INLET FILTER
DOMESTIC
COLD WATER
SUPPLY
ISOLATING
VALVE
(F24e & F28e ONLY)
44
THROTTLE
Diagram 13.9
DOMESTIC
COLD
WATER
FILTER
HOUSING
PLUG
Diagram 13.10
Diagram 13.11