Glow-worm SwiftFlow 120 Servicing Instructions page 17

4.6 Thermocouple
Remove the sealing gland, secured with a single screw,
see diagram 2.4.
Remove the spark electrode/lead, see diagram 2.4.
Disconnect the thermocouple at both ends, see diagram
2.4 and 4.2.
Remove the thermocouple.
Do not tighten the thermocouple nut more than a quarter
turn beyond finger tight or make any sharp bends in the
capillary.
4.7 Boiler Overheat Cutoff
Remove the control housing as the appropriate part of
Section 4.1.
Remove piezo unit bracket, disconnect lead, see
diagram 4.3.
Disconnect the boiler overheat cutoff electrical
connectors from the multifunctional control, see
diagram 4.2.
Remove the boiler overheat cutoff, secured with two
screws, see diagram 4.2.
Use the heat sink compound supplied, between the
mounting plate and the cutoff, when fitting it.
4.8 Water Pressure Switch
Release the water pressure and drain the central heating
circuit of the boiler, refer to Section 1.3 and 1.6.
Disconnect the electrical connectors at the water pressure
microswitch, see diagram 4.4.
Remove pressure switch.
Replace the "O" ring seal with the new seal provided.
Make sure that the switch terminals are facing diagonally
forwards to give access, as shown in diagram 4.4.
Reconnect the electrical connections, refer to
diagram 4.11.
Supplied By www.heating spares.co Tel. 0161 620 6677
4 R e p l a c e m e n t o f P a r t s
17
SECURING
SCREW (2)
OVERHEAT
CUTOFF
CONNECTORS
ELECTRICAL
CONNECTORS
THERMOCOUPLE NUT
PIEZO UNIT
BRACKET
IGNITION
LEAD
PIEZO
UNIT
SECURING
SCREW (2)
SELECTOR SWITCH
Diagram 4.2
Diagram 4.3
WATER
PRESSURE
SWITCH
Diagram 4.4
221045A