11.0 Changing Components
35
11.18
Expansion Vessel
(Fig. 77)
1. Drain the primary circuit and undo the nut on
the expansion pipe at the adaptor on the bottom
of the vessel.
2. Undo the nut and washer securing the vessel to
the mounting bracket on the side of the storage
tank.
3. Lift the vessel slightly to disengage the adaptor
from the mounting bracket. Remove the vessel
from the appliance.
4. Reassemble in reverse order.
11.19
Storage Tank Temperature &
Pressure Relief Valve
(Fig. 79)
1. It is necessary to remove the expansion vessel
as described in 11.18 prior to changing the relief
valve.
2. Undo the nut on the discharge pipe at the valve
and ease the pipe out of its retaining clip on the
case side.
3. Undo the nut on the temperature and pressure
relief valve securing it to the spigot on the storage
tank and remove the valve.
4. Ensure that the sealing washer is in place and
fit the new valve. Reassemble in reverse order.
Discharge Pipe
Retaining Clip
Discharge Pipe
Storage Tank
Temperature &
Pressure Relief Valve
Expansion
Vessel
Expansion Pipe
Mounting
Bracket
Fig. 80
Fig. 78
Fig. 77
Fig. 79
