Heatrae Sadia ELECTROMAX SOLAR Installation & Servicing Instructions Manual page 60

8.7 DOMESTIC HOT WATER EXPANSION VESSEL
1. Switch off mains water supply.
2. Depressurise the system by opening a hot tap.
3. Loosen the union nut connection between the expansion vessel and the flexible hose
coupling and catch any water with a cloth.
4. When water stops flowing, undo the union nut fully.
5. Lift the expansion vessel from the moulded support nest. NOTE: the expansion vessel
may contain some water, take care not to spill this into the Electromax Solar.
6. Fit the new expansion vessel and re connect the flexible house coupling.
8.8 COLD WATER COMBINATION VALVE
1. Drain the domestic hot water cylinder.
2. Undo the compression connections to the mains water supply and the expansion relief
valve discharge pipework and remove the cold water combination valve.
3. Fit the new cold water combination valve and re connect the compression fittings to the
mains water supply and the expansion relief valve discharge pipework.
FIGURE 37: DOMESTIC HOT WATER COMPONENTS
TEMPERATURE &
PRESURE RELIEF VALVE
DICHARGE PIPE 1
TUNDISH
DISCHARGE PIPE 2
60
DOMESTIC HOT WATER
EXPANSION VESSEL
UNION NUT CONNECTION
FLEXIBLE HOSE
COMPRESSION
FITTING