Worcester GREENSOURCE 6 kW Installation Manual page 17

Size of discharge
Valve outlet size
pipework D1
G1/2 15 mm
<G3>/4 22 mm
G1 28 mm
How to drain the hot water cylinder
1. Turn off the main water supply to the cylinder.
2. Open a hot water tap with a position as low as possible in the building,
in order to reduce the pressure.
3. Remove the pipe connection 1 - Mains cold water in and connect
one end of the hose pipe to the connection. Terminate the other end of
the hose to a drain or to outside. Ensure that the drain end of the hose
is at a lower level than the bottom of the cylinder. The greater the fall
on the hose, the higher the flow rate.
4. Disconnect connection 2 - Domestic hot water out.
5. Start the siphon effect by pumping or sucking at the drain end of the
hose.
6. Let the whole volume drain out.
How to fl ush the system & tank
To fl ush the tank use the above proposed setup, add a hose onto the hot
water outlet position number 2 (in the above diagram) and then fl ush the
hot water tank.
Maximum length of
Size of discharge
straight pipe
pipework D2
(no bends or elbows)
22 mm
28 mm
35 mm
28 mm
35 mm
42 mm
35 mm
42 mm
54 mm
17
Deduct the fi gure below from the
maximum length for each bend or
elbow in the discharge pipe
Up to 9 m
Up to 18 m
Up to 27 m
Up to 9 m
Up to 18 m
Up to 27 m
Up to 9 m
Up to 18 m
Up to 27 m
Connecting to the heating system
0.8 m
1.0 m
1.4 m
1.0 m
1.4 m
1.7 m
1.4 m
1.7 m
2.3 m
1
2
>0cm