Glow-worm Swift flow 75e Instructions For Use Installation And Servicing page 36

4.9 Water Pressure Switch
Release the water pressure and drain the central heating circuit
of the boiler, refer to Section 1.3 and 1.6.
Remove the control housing, secured with two screws. Support
control housing on a surface or by screwing it to front edge of the
base, using the outer case securing screw, see diagram 4.10.
Disconnect the electrical connectors at the pressure microswitch,
see diagram 4.7.
Remove pressure switch, see diagram 4.7.
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 4.7.
Reconnect the electrical connections, refer to diagram 4.12.
4.10 Domestic Hot Water High Limit Control
Remove the pump, see Section 4.25.
Disconnect the electrical connectors at the domestic hot water
high limit control, see diagram 4.8.
Remove the high limit control from the flow pipe, secured with
two screws.
Use the heat sink compound supplied, between the mounting
plate and the control.
When refitting the electrical connections to the high limit control
the polarity is not important, see diagram 4.12.
4.11 Pressure Gauge
Remove the control housing assembly, see Section 4.9
Release the water pressure and drain the central heating circuit
of the boiler, refer to Section 1.3 and 1.6.
Remove the pressure gauge bracket.
Disconnect the pressure gauge connection from the safety
valve, discard the washer, see diagram 4.9.
Remove the pressure gauge secured with the retaining spring
tabs.
Locate the supplied washer under the pressure gauge connection
when refitted to the safety valve.
4.12 Control Boards
Remove the clock/timer mounting bracket securing screws, see
diagram 4.29.
Remove control housing cover and fascia, see diagram 4.10.
Remove the control housing assembly, Section 4.9.
Disconnect all multi-pin connectors, see diagram 4.11.
Remove the control boards from the support posts, noting their
correct positions. Great care must be taken when handling any
control board.
THE MAIN CONTROL BOARD MUST BE KEPT IN THE ANTI
STATIC HOLDER UNTIL IMMEDIATE REQUIREMENT.
To connect the multi-pin connectors correctly, see diagram
4.15.
When replacing the main control board check and if necessary
adjust the main burner gas pressure in both the hot water and
central heating modes. Refer to "Commissioning" in the
Installation Instructions.
221422A
Supplied By www.heating spares.co Tel. 0161 620 6677
4 Replacement of Parts
D.H.W. HIGH LIMIT
CONTROL
SAFETY
VALVE
SEALING
WASHER
PRESSURE
GAUGE
CONNECTION
SECURING
SCREW (2)
PRESSURE
GAUGE
36
ELECTRICAL
CONNECTORS
SECURING
SCREW (2)
WATER
PRESSURE
SWITCH
Diagram 4.7
D.H.W.
HIGH
LIMIT
CONTROL
Diagram 4.8
PRESSURE
GAUGE
BRACKET
Diagram 4.9