12
13
8.3.4
Release the 2 screws, nuts and washers securing the main burner to the mounting bracket and remove the main
burner.
8.3.5
Clean the burner thoroughly both inside and out with a soft brush.
DO NOT ENLARGE, DISTORT OR DAMAGE
BURNER HOLES
.
8.3.6
Reassemble in reverse order.
8.4
IGNITION BURNER AND ELECTRODE REMOVAL AND REPLACEMENT:
8.4.1
Remove the burner as detailed in 8.2 above.
8.4.2
Disconnect the igniter lead from electrode.
8.4.3
Break the gas feed at the burner end of the gas feed pipe.
8.4.4
Release the single screw, nut and washer securing the ignition burner to the main burner assembly and carefully
remove the ignition burner assembly.
8.4.5
Release the electrode securing nut from the ignition burner assembly and withdraw the electrode.
8.4.6
Release the ignition burner feed pipe securing nut from the ignition burner assembly and withdraw the feed pipe and
injector from the ignition burner assembly. Disconnect the ignition burner injector from the ignition burner feed pipe
hook.
8.4.7
Release the 2 x 5mm screws securing the ignition burner bracket to the ignition burner mounting bracket and remove
the ignition burner bracket.
8.4.8
Refitting or replacement is in reverse order.
8.5
AIR CIRCULATING FAN, REMOVAL AND CLEANING:
8.5.1
Ensure that the electrical supply is isolated.
8.5.2
Remove the front door from the heater and remove the 3 x fixing screws on the electrical door assembly.
8.5.3
Open the door assembly outwards on its hinges (see fig. 7) such that access is gained to the rear of the assembly.
8.5.4
Disconnect the fan flying leads from the fan assembly.
8.5.5
Release the fan assembly securing screws and withdraw the fan assembly from the heater cabinet, avoiding damage
to the fan blades.
8.5.6
Remove all dust from both the impeller and motor, taking care to not disturb the balance of the fan.
8.5.7
Refitting or replacement is in reverse order.
8.6
CONTROL MODULE REMOVAL:
8.6.1
Ensure that the electrical supply is isolated.
8.6.2
Remove the front door from the heater.
8.6.3
Loosen the top and bottom screws holding the electrical cover plate in place on the electrical door assembly. (see fig.
7) DO NOT COMPLETELY REMOVE THE SCREWS AT THIS STAGE.
8.6.4
Remove the cover plate by sliding it upwards, such that it exposes the control module.
8.6.5
Carefully disconnect the module by lifting the connecting blocks off the circuit board (see fig. 11)
NOTE: There is no need to loosen any of the connection screws on the connector blocks!
8.6.6
Completely remove the top and bottom cover plate screws and pull the control module free of the electrical door
assembly.
8.6.7
Fit the new control module in place and partially fit the cover plate fixing screws. DO NOT TIGHTEN SCREWS AT
THIS STAGE!
8.6.8
Re-connect the module by carefully pushing the connector blocks onto the circuit board.
8.6.9
Re-fit the electrical cover plate and tighten the cover plate screws.
8.6.10 Re-establish electrical supply.
8.6.11 Commission the heater as decribed in the relevant sections above.
8.7
TIME CONTROL, SWITCH AND LED INDICATOR (DAUGHTER BOARD) REMOVAL:
Preparation:
8.7.1
Ensure that the electrical supply is isolated.
8.7.2
Remove the appliance front door and release the 3 x securing screws on the electrical door assembly.
8.7.3
Open the door assembly outwards on its hinges (see fig. 7) such that access is gained to the rear of the assembly.
Time Control
removal:
8.7.4
Disconnect spade terminal connectors “
C1
”, “
C2
”, “
C3
” and “
C5
” from the time control.
8.7.5
Release the 3 x fixing screws securing the clock mounting plate to the electrical door and withdraw the total assembly
from the door.
8.7.6
Remove the 3 x M3 bolts that secure the time clock mechanism and remove from the mounting plate.
8.7.7
Refitting or replacement is in reverse order.
LED Indicator (Daughter Board)
8.7.8
Disconnect the daughter board by unplugging the flylead from the control module board.
8.7.9
Release the 3 x fixing screws securing the clock mounting plate to the electrical door and withdraw the total assembly
from the door.
8.7.10 Remove the 2 x M3 nuts holding the board onto the bolts and remove.
8.7.11 Replacement is in reverse order, ensuring to refit the spacers.
Switch removal:
8.7.11 Disconnect the spade terminal connectors
“S1”
, “
S2
” and
“S3”
from the switch terminals.
8.7.12 Release the switch by pressing out from the back of the electrical door assembly.
8.7.13 Fit new switch and lock into position by pressing home until the locking tabs locate on the top and bottom of the
switch.
8.7.14 Re-connect the spade connectors.
8.7.15 Re-fitting of the electrical door assembly is in reverse order.
8.7.16 Close the electrical door assembly and secure using the 3 x fixing screws.
8.7.17 Set the time control to correct time.
8.7.18 Set the time control to the required “ON” and “OFF” periods.
8.8
FAN DELAY CONTROL/LIMIT SWITCH REMOVAL:
8.8.1
Ensure that the electrical supply is isolated.
8.8.2
Remove the appliance front door.
8.8.3
Remove the 2 x fixing screws holding the FDC/limit switch assembly in place and withdraw from the appliance.
8.8.4
Refitting or replacement is in reverse order.
8.9
HEAT EXCHANGER ACCESS:
8.9.1
Ensure that the gas and electrical supplies are isolated.
8.9.2
Remove the appliance front door.
8.9.3
Remove the fixing screws holding the sealing panel in place and carefully remove the panel.
8.9.4
Remove the burner assembly as detailed at 8.2
8.9.5
Release the screws securing the combustion chamber heat shield and withdraw the heat shield.
8.9.6
Release the screws securing the top access cover plate and withdraw the cover plate and gasket.
8.9.7
Release the screws securing the heat exchanger top sealing plate and withdraw the sealing plate and gasket.
8.9.8
Reassembly is in reverse order.
NOTE:
When reassembling ensure that gaskets are soundly sealed and replaced where necessary (See cautionary note at
paragraph 10) Prior to use, you MUST fully commission the heater in accordance with these instructions.
8.10
FLUE FAN, REMOVAL AND CLEANING
8.10.1 Remove the air circulation fan as detailed at 8.5
8.10.2 Carefully open the plastic insulators on the fan fly-lead and break the electrical connections.
8.10.3 Remove the fixing screws holding the flue fan sealing plate in place and remove the plate.
8.10.4 Carefully remove the feed pipes to the pressure switch TAKING CARE TO NOTE THEIR POSITION.
8.10.5 Release the 4 x fixing screws holding the flue fan in place
