Glow-worm SwiftFlow 120 Servicing Instructions page 19

4.12 Pressure Gauge
Remove the control housing assembly, see diagram 4.1.
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 4.7.
Remove the pressure gauge secured with the
retaining tabs.
Locate the supplied new washer under the pressure
gauge connection when refitting the safety valve.
4.13 Control Boards
CAUTION. Great care must be taken when handling
any control board.
THE MAIN CONTROL BOARD MUST BE KEPT IN
THE ANTI STATIC HOLDER UNTIL NEEDED.
Note. Timer/clock may be removed to improve access,
see Section 4.32 or the control housing bottom half can
be removed.
Main Control Board
Remove control housing cover securing screw, see
diagram 4.8.
Remove the control housing assembly as shown in
diagram 4.1.
Lift the control housing cover to gain access to
the board.
Disconnect all multipin connectors, see diagram 4.8.
Remove the control board from the support posts.
To reconnect the multipin connectors correctly, see
diagram 4.11.
When replacing the main control board check and if
necessary adjust the main burner gas pressure in both the
domestic hot water and central heating modes. Refer to
"Commissioning" in the Installation Instructions.
Fan Driver Board
Remove the fan driver control housing assembly
securing screws.
Remove the multipin connectors, see diagram 4.9.
Release the board from its support posts then remove the
nut and screw securing the board to the cover, see
diagram 4.9.
User Control Board
Remove the fascia, see diagram 4.8.
Remove the multipin connector.
Remove the control board from the supports posts.
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
SAFETY
VALVE
SEALING
WASHER
PRESSURE
GAUGE
CONNECTION
SECURING
SCREW (2)
FASCIA
CONTROL
HOUSING
SECURING
SCREW (2)
19
PRESSURE GAUGE
FASCIA TEMPERATURE
SECURING CONTROL KNOB
SCREW (3)
CONTROL
HOUSING
COVER
HINGE PIN
TRANSFORMER
MULTI-PIN
CONNECTORS
SUPPORT POSTS
USER CONTROL
BOARD
PRESSURE
GAUGE
BRACKET
Diagram 4.7
CONTROL
HOUSING
COVER
SECURING
SCREW
Diagram 4.8
221045A