Glow-worm Betacom C - Manual (Page 57)

57
14 Replacement of parts
14.6 Air pressure switch
For access, refer to section 14.1.
The air pressure switch is located above the expansion
vessel, see diagram 14.3.
Remove the sensing tubes and electrical connections from
the air pressure switch, noting which tube is connected to
which port.
Remove the air pressure switch by unclipping it from the
bracket.
Fit the replacement air pressure switch in reverse order of
removal.
14.8 Printed circuit board
For access, refer to section 14.1.
Turn off and isolate the electrical supply.
Unclip the two front retaining clips on the controls fascia, see
diagram 10.3.
Unclip and carefully pull down the control circuit board cover,
see diagram 10.4.
Remove the electrical connections to the PCB by pulling
carefully, noting the locations of all the terminals.
Release the four screws securing the PCB to the control panel
and lift out the PCB.
Fit the replacement PCB in reverse order to removal, ensuring
that the PCB electrical connections are fully pushed home.
Check and re-set as necessary the potentiometers and dip
switches to the same value as the old PCB. 14543
14578
14494
14577
Diagram 14.3
Diagram 14.5
Diagram 14.6 Diagram 14.4
14.7 Burner
Refer to section 12.3. to replace the burner.
Retain all washers/gaskets for use on re-assembly.
Remove the burner injectors as shown in diagram 14.4.
Fit the burner injectors to the new burner injector bar and
tighten, ensuring that the injector size, marked on each
injector is the same as stated in the ‘Boiler Specification
section’ page 8, for the type of gas being used.
Replace the burner bar and re-fit the burner blades (replace
any damaged seals as necessary).
Fit replacement burner in reverse order.
Check gas soundness and boiler operation.
14.9 Pump head
For access, refer to section 14.1.
Drain the boiler’s circuit as detailed in section 14.2.
Remove the screws, see diagram 14.6.
Pull off the motor, remove the cover and disconnect the
electrical connections from cable box.
Fit the replacement motor in reverse order ensuring correct
polarity of the electrical connections.
Re-open the isolating valves on the flow and return
connections, refill, vent and re-pressurise the system, check
for leakage.
ELECTRICAL
CONNECTIONS
AIR PRESSURE
SWITCH
SENSING TUBES
(2 OFF)
BURNER
INJECTOR BAR
PUMP
HEAD
INJECTOR
COVER
BRACKET
SECURING
SCREWS (2 OFF)
SECURING SCREWS (4 OFF)
SECURING SCREWS (4 OFF)
PRINTED CIRCUIT BOARD