Glow-worm Energysaver Combi 80-100 - Manual (Page 27)

27 221564F
12.6 Combustion Check.
Connect a CO
2
combustion analyser to the test point on the flue
elbow if fitted, or alternatively to the sample point at the base of
the flue outlet pipe inside the boiler casing, see diagram 12.1.
Turn on the gas isolation valve, see diagram 8.1.
Turn on the electricity supply.
The boiler should fire automatically, but if there is no demand for
heat open a hot water tap to create a demand.
Repeatedly press the 'Mode' button on the boiler fascia until the
symbol appears.
Press and hold the 'Mode' button for greater than one second
until the decimal point is flashing on the display.
The boiler is now locked at minimum input.
Allow the boiler to stabilise for a few minutes and then check the
CO
2
value. See Table 1.
If adjustment proves necessary then proceed as follows.
NOTE: The CO
2
value can only be adjusted at minimum input.
Any adjustment to the gas valve should only be carried out by
a qualified person.
Remove the protective cap from the Gas Valve. See diagram
11.2.
Turn the adjuster until the correct CO
2
value is attained.
To check the combustion at full rate repeatedly press the mode
button on the boiler fascia until the symbol appears. Press
and hold the mode button until the decimal point on the display
flashes.
The boiler is now locked at maximum input.
If necessary several hot water taps should be turned on to
deliver maximum flow rate to prevent the boiler from shutting
down for overheat protection.
Check the combustion levels of CO and CO
2
.
If the combustion is excessive, see fault finding section 13.3.
NOTE: The CO
2
level should not be adjusted in maximum input
lock mode.
Press the Reset button to remove the minimum or maximum
input lock. Replace caps on sample point and gas valve.
12.7 Cold Water Inlet Filter
If the water flow rate through the appliance has reduced it may
be necessary to clean or replace the water inlet filter.
Turn off the electrical supply to the boiler.
Drain the Domestic Hot Water circuit by closing the cold water
isolation valve on the wall mounting jig, see diagram 8.1.
Open one or more hot water taps to drain the hot water circuit.
Undo and remove the drain screw on the cold water inlet valve
and drain away any remaining water.
Undo the connecting nuts on either end of the water inlet pipe
and remove the pipe from the boiler.
Remove the filter situated in the end of the cold water inlet pipe,
see diagram 12.8.
Clean the filter, inspect and renew if necessary.
Replace the filter into the cold water inlet pipe. Replace the drain
screw in the cold water isolation valve. Replace the water inlet
pipe and tighten the unions.
Open the cold water isolating valve and test the Domestic Hot
Water circuit for soundness.
12.8 Casing Panel Removal
During major servicing or replacement of parts it may be
necessary to remove the boiler side panels to gain access.
Remove the front door and the control door. See section 11.7.
To remove a side panel undo and remove the four screws
securing the lower panel brackets to the boiler.
Remove the brackets along with the control door.
Undo and remove the four screws securing each side panel to
the boiler, two at the bottom and two at the top.
Pull the panel out at the bottom and off at the top of the boiler.
12.9 Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing the
heating flow and return isolating valves on the wall mounting jig,
see diagram 8.1.
NOTE: These valves are closed when the slots are at right
angles to the direction of flow.
Lift the head of the pressure relief valve on the underside of the
boiler by twisting and allow the boiler circuit to drain. Complete
draining by removing the drain screws from the isolating valves
and drain the water into a suitable receptacle.
After servicing or replacing parts, open the heating flow and
return isolating valves and refill, vent and pressurise the heating
circuit. See section 11.2.
Check for leaks.
12.10 Draining of Boiler Hot Water Circuit
Drain the Domestic Hot Water circuit by closing the cold water
isolation valve on the wall mounting jig.
Open one or more hot water taps to drain the hot water circuit.
Undo and remove the drain screw on the cold water isolation
valve and drain away any remaining water, see diagram 8.1.
After servicing or replacing parts, replace the drain screw, open
the cold water isolation valve and slowly open a hot water tap
to remove air. Close the hot water tap and check for any leaks.
12 Servicing
ATTENTION!
When carrying out a combustion check
or replacing the gas valve, please refer
to the gas valve replacement instructions
for the gas valve setting procedure.