Glow-worm Energy Saver 80 - 100 and Gave Valve - Manual (Page 34)

34 221564F
Diagram 14.4
6567
HEATING RETURN
THERMISTOR
THERMISTOR
CLIP
ELECTRICAL
CONNECTION
(2 OFF)
14.16 Pressure Gauge
Refer to section 12.9 and drain the boiler heating circuit.
Undo the union to the return pipe.
Push the pressure gauge out of the controls fascia while
depressing the retaining lugs behind the fascia, see diagram
14.5.
When replacing the gauge, ensure that the location pin engages
in the slot in the fascia.
Refill, vent and pressurise the boiler.
Check for leaks.
14.17 Low Water Pressure Switch
Refer to section 12.9 and drain the boiler heating circuit.
The Low Water Pressure Switch is located on the boiler flow
pipe directly below the heat exchanger.
Remove the automatic control module, see section 14.4.
Remove the condense trap vent pipe by twisting out of the trap
body, see diagram 12.2.
Disconnect the electrical connections from the switch.
Using a 27mm spanner, remove the switch from the flow pipe,
see diagram 14.6.
Fit the new Low Water Pressure Switch using suitable sealant
on the threads.
Refill, vent and pressurise the boiler.
Check for leaks.
14.18 Expansion Vessel
Refer to section 12.9 and drain the boiler heating circuit
Undo the coupling at the base of the vessel.
While holding the vessel undo the securing bolt on the top panel
of the boiler. Remove the expansion vessel from the boiler
taking care not to lose the securing bolt spacer from the top of
the unit.
Fit the replacement unit ensuring that the securing bolt spacer
is in position and the securing bolt passes through it.
Refill, vent and pressurise the boiler.
Check for leaks.
14.19 Thermostatic Mixer Valve
Refer to section 12.10 and drain the boiler hot water circuit.
From below the boiler base plate, remove the gas pipe and
remove both cold and hot water pipes from the thermostatic
mixer valve.
From above the boiler base plate remove the three way valve
head. See section 14.5.
Undo both hot and cold water connections to the cylinder.
While holding the thermostatic mixer valve undo the two
hexagonal bulkhead connectors, see diagram 14.7.
Fit new valve.
Open the cold water inlet valve.
Check for leaks.
14.20 Hot Water Cylinder
To remove the hot water cylinder it is necessary to drain down
the boiler heating and hot water circuits.
Refer to section 12.9 and drain the boiler heating circuit.
Refer to section 12.10 and drain the boiler hot water circuit.
The right hand casing panel should be removed as described in
section 12.8.
Remove the expansion vessel as described in section 14.18.
Remove the three way valve as described in section 14.6.
Remove the domestic hot water thermistor as described in
section 14.7.
From above the boiler remove the cylinder automatic air vent,
see diagram 11.1.
Remove the cylinder securing collar, see diagram 11.1.
Remove the automatic air vent non- return valve from the top of
the boiler and temporarily replace the cylinder securing collar.
Undo the thermostatic mixer valve connections to the cylinder.
Remove the thermostatic mixer valve, see section 14.19.
Undo the cylinder flow pipe connection from the bottom left
hand side of the cylinder.
While holding the cylinder in place, remove the cylinder securing
collar on top of the boiler.
Lean the cylinder forwards and lift upwards, disengaging the
location studs at the rear and the cylinder flow pipe connection.
Fit the replacement cylinder ensuring its fitting on the location
studs at the rear of the appliance.
When refitting the automatic air vent non - return valve, a
suitable thread sealant must be used.
Open the isolating valves of both heating and hot water circuits,
refill, vent and pressurise the heating circuit.
Check for leaks.
14.21 Heat Exchanger
Refer to section 12.9 and drain the boiler heating circuit.
Refer to Section 12.10 and drain the boiler hot water circuit.
14 Replacement of Parts