Glow-worm 56-2 Back Boiler - Manual (Page 19)

19 221781A
Diagram 10.1 FUNCTIONAL FLOW WIRING
8084
C
L s
GAS VALVE SOLENOID
THERMOSTAT
BLUE BROWN
VIEW OF
PLUG WHEN
REMOVED
BLUE
NC
3 4
N L
E
N N
BLACK
9.8 Control Thermostat
Disconnect the gas valve electrical plug, see diagram 5.2.
Remove the split pin to release the control thermostat phial, see
diagram 5.6.
If the phial pocket and/or the electrical supply is on the right
hand side, release the capillary and/or the main lead from the
clips, see diagram 5.1.
Remove the control box securing screw and lift the box upwards
to release, see diagram 5.2.
Remove the control thermostat knob “B”, see diagram 9.2.
Remove the two securing screws and remove the control
thermostat body.
When fitting the new control thermostat, make sure that the
capillary connection to the control thermostat body is placed at
the top of the control box top.
Refit electrical connections.
Capillary should pass through the cut out on the control box top,
see diagram 5.3. Care should be taken to make sure that the
side plate hooks onto the box before fitting the securing screw.
9.9 Viewing Window
Gain access as the relevant parts of Section 8.3.
Remove the old self adhesive aluminium foil gasket and the old
mica window. Replace with a new mica window. Peel off the
backing paper and secure with new self adhesive aluminium foil
gasket, see diagram 9.3. Ensure no air bubbles are trapped
underneath the foil.
Important
Make sure that the mica window fully covers the opening and
that the hole in the aluminium foil gasket is centred over
opening.
9.10 Flue Blockage Safety Device Sensing
Tube Fitting
Remove filter, unscrew thread cutting screw and remove sensing
tube fitting assembly, see diagram 9.4.
When fitting new filter, take care not to damage the filter.
10.1 Electrical
Carryout the preliminary electrical system checks as contained
in a multimeter instruction book.
Refer to functional flow wiring diagram 10.1 and electrical fault
finding chart, diagram 10.2.
On completion of the fault finding task which has required the
breaking and remaking of electrical connections the checks
earth continuity, polarity and resistance to earth must be
repeated.
10.2 Thermocouple
To test the thermocouple, a meter with a range of 0 - 30mV is
required together with a thermocouple interrupter test unit.
Refer to thermocouple fault finding chart, diagram 10.3 and
diagnosis graph, diagram 10.4.
10.3 Back Boiler Pilot and Ignition
To check back boiler pilot and ignition, refer to pilot fault finding
chart, diagram 10.5.
10.4 Flue Blockage Safety Device
If the device operates and the filter is clean, it indicates there is
a problem with the chimney. Make sure air vents are free from
obstruction, carry out spillage checks as Fire Front Installation
Instructions and put right as necessary.
10 Fault Finding
9 Replacement of Parts