Glow-worm Ultrapower 170sxi Installation And Servicing page 47

GAS SUPPLY PIPE
SECURING CLIP
ELECTRICAL
GAS VALVE
CONNECTION
FLUE
OVERHEAT THERMOSTAT
HEAT EXCHANGER
SEAL
BURNER
DOOR
GAS VALVE
BURNER
FRONT INSULATION
DOOR
SPARK
ELECTRODE
Supplied By www.heating spares.co Tel. 0161 620 6677
13 Servicing
FAN
ELECTRICAL
CONNECTION
Diagram 13.10
NYLOC
NUT (4 OFF)
SILENCER
BRACKET
FAN
Diagram 13.11
BURNER
SECURING
GASKET
SCREW (4)
GAS VALVE
AND FAN
Diagram 13.12
13.7 Heat Exchanger
Refer to diagram 13.11.
Remove loose debris from inside the heat exchanger using a
soft brush and vacuum cleaner.
Carefully flush by spraying water into the heat exchanger, any
remaining debris should pass through the condensate trap
(Ensure the water is kept away from electrical components).
13.8 Combustion Setting
A combustion check should not be necessary unless a gas
carrying component has been replaced or the combustion
setting is suspect.
Connect a flue gas analyser to the test point, see diagram
13.13.
IMPORTANT: Products of combustion will be discharged
when the cap is removed. It is important to replace the cap
immediately.
If no flue gas analyser is available and with the boiler module
front panel removed, check the flame picture through the
viewing window
Turn on the gas service cock, see diagram 12.1.
Turn on the electrical supply, the appliance will begin the
ignition sequence.
A competent person only should carry out any adjustment
to the gas valve, refer to diagram 13.14.
Monitor the combustion reading and at max rate the reading
should be 9.2% ± 0.5.
If adjustment proves necessary then proceed as follows:
Press the "reset" button on the controls fascia, release
and immediately press and hold in the "+" button. After
approximately 5 seconds "Hi" will be displayed.
Pressing the mode button when "Hi" is selected will force the
boiler to maximum rate, the display will flash between "Hi"
and the "default display" this will indicate the boiler has been
forced to maximum.
Adjust the maximum rate CO
(Rotate anti-clockwise to increase).
To exit the check sequences press the "+" buttons, this will
reset the boiler to the default display.
47
with the throttle to 9.3%.
2