Glow-worm hxi and Gas Valve - Manual (Page 28)

28 0020008153-05
9.2 Electrical connections - testing
Carry out preliminary electrical system checks as below:
1. Test insulation resistance to earth of mains cable.
2. Test the earth continuity and short circuit of cables.
3. Test the polarity of the mains.
9.3 Pump Connection
Ensure that a seperate pump supply cable is fed to the boiler,
see diagram 9.2.
Remove connection box, see diagram 9.1.
Route the pump supply cable through the strain relief cable
gland, connect to the connection box as shown in diagram 9.2.
Refer to diagram 12.1 for wiring colour code.
Refit the connection box to the underside of the boiler using the
two retaining screws.
9 Electrical Connections
10 Commissioning
Please ensure the “Benchmark” logbook is completed and left
with the user and the magnetic lighting instruction label is
placed on the surface of the boiler casing.
LPG CONVERSION - 30hxi only
NOTE: Steps 10.1 to 10.3 will need to be completed before the
appliance can be converted.
The 30hxi can be converted to run on LPG-Propane (G31).
This conversion should only be carried out by a competent
person.
During the conversion to Propane use of a suitable flue gas
analyser is necessary.
As an option a chargeable boiler only commissioning service
can be provided by Glow-worm Service by calling telephone
No. 01773 828100.
Tools required to make the conversion are a 2mm Allen key and
an electricians screwdriver.
Ensure that the appliance supply pressure = 37mbar.
NOTE: Remove the inner casing panel, see diagram 10.1.
(1) To access the gas valve. If necessary remove chassis
front for extra access. See diagram 11.3
(2) Refer to diagram 10.3 and turn the gas valve throttle fully
clockwise.
(3) Turn the throttle back anti-clockwise by 5 1 /
2
turns.
(4) Ensure that the gas analyser is set to the correct fuel
setting - Propane.
(5) Attach combustion analyser to the combustion test point.
See diagram 11.6.
(6) Unclip the controls fascia to reveal the service
potentiometer on the rear of the user interface.
See diagram 11.7.
(7) Turn on the mains electrical supply and turn on the
gas service cock. Switch the boiler on.
(8) Ensure external controls are calling for heat. The
boiler should fire automatically.
(9) Using an electrical screwdriver, rotate the service
potentiometer to the mid point or 3 o’clock position.
See diagram 11.7. The fan speed should now reduce
to minimum and ‘12’ should be shown flashing on the
digital display. Check the CO
2
value. If necessary
refer to diagram 10.3 and using a 2mm allen key
carefully adjust the offset screw until a CO
2
reading
of 10.5% ± 0.2% is achieved. Turning the offset
screw clockwise increases the CO
2
reading.
(10) After setting combustion, rotate the service
potentiometer fully anti-clockwise so that the display
indicates the water temperature. Check that the CO
2
combustion remains between 9.8% and 10.8% CO
2
.
If it does not, carefully adjust the gas valve throttle
(see diagram 10.3) until this is achieved.
(11) Remove analyser probe from the test point and replace the
cap. Refit the control panel.
(12) Fit the LPG conversion label supplied in the documentation
pack to the inner front panel alongside the data
label. Refit the inner door and outer door.