Glow-worm Betacom C - Manual (Page 62)

62
14 Replacement of parts
14.15 Expansion vessel
For access, refer to section 14.1.
Drain the boiler circuit, refer to section 14.2.
Refer to diagram 14.16.
Disconnect the flexible pipe coupling on expansion vessel.
Release and remove the nut securing the expansion vessel to
the boiler.
Remove the side panels.
Remove the air pressure switch, refer to section 14.6.
Remove the flue if required.
Lift the vessel out of boiler from the gap over the chassis
and fit the replacement vessel to the boiler in reverse order
to removal, ensuring that sealing washer is fitted to pipe
connection before tightening, replace the washer if necessary.
Using a pressure gauge, ensure that expansion vessel charge
pressure is 0•5bar (7•5psi)
Open the isolating valves on the flow and return connections,
refill, vent and pressurise the boiler ensuring all joints are
sound.
14589
14588
14587
Diagram 14.16
Diagram 14.18
Diagram 14.17
14.16 Overheat safety thermostats
For access, refer to section 14.1.
Remove the front panel, combustion chamber cover and right
side panel.
Refer to diagram 14.17.
Locate the overheat safety thermostat at the front left hand
side of the boiler and on the right hand side of the primary
heat exchanger.
Disconnect the electrical connections from the thermostat.
Unclip the thermostat from the pipe.
Fit the replacement thermostat in reverse order of removal.
14.17 Pressure safety relief valve
For access, refer to section 14.1.
Drain the boiler circuit, refer to section 14.2.
Refer to diagram 14.18.
Disconnect the discharge pipe on the outlet of the safety relief
valve.
Unscrew to remove the safety relief valve from the R.H.
hydroblock and retain the o-ring for use on reassembly,
replace as necessary.
Fit the replacement safety relief valve in reverse order to
removal and refill, vent and pressurise boiler ensuring all joints
are sound.
FLEXIBLE PIPE
CONNECTION
PRESSURE
SAFETY RELIEF
VALVE
UNSCREW
TO REMOVE
R.H. HYDRAULIC
BLOCK
DISCHARGE
PIPE
SECURING NUT
OVER HEAT SAFETY
THERMOSTAT
ELECTRICAL
CONNECTIONS