MEGAFLO Eco SystemReady, Product Manual

Page: 16 / 44

Unvented Hot Water Cylinder
16
INST
ALLA
TION AND
COMMISSIONING INSTRUCTIONS (2)
Drain Taps
Drain taps are fitted to both the primary system pipework and the cold water inlet to facilitate draining the unit
or indirect heating heating circuit for maintenance purposes. It is recommended that the outlet point of the
drain pipe work be at least 1 metre below the level of the heater (this can be achieved by attaching a hose pipe
to the drain tap outlet spigot).
Outlet Pipework
Ideally the pipework from the Megaflo eco SystemReady SB to the outlet fittings should be in 22mm pipe with
short runs of 15mm pipe to showers and basin taps. Small bore pipe can also be used to suit some taps, but
runs should be of minimum length. Pipe sizes may vary due to system design.
Secondary Circulation
If a secondary circulation system is required it is recommended that it be connected to the Megaflo eco
SystemReady SB as shown in Figure 7 below. The secondary return pipe should be in 15mm pipe and
incorporate a check valve to prevent backflow. A suitable WRAS approved bronze circulation pump will be
required. On large systems, due to the increase in system water content, it may be necessary to fit additional
expansion volume to the system by fitting an external expansion vessel to the secondary circuit. This should be
done if the capacity of the secondary circuit exceeds 10 litres.
Pipe Capacities (copper)
15mm o/d = 0.13 litres per metre run (10 litres = 77m)
22mm o/d = 0.38 litres per metre run (10 litres = 26m)
28mm o/d = 0.55 litres per metre run (10 litres = 18m)
Figure 7 - Secondary Circulation Connection
MAINS WATER
SUPPLY
TO HOT OUTLET
CHECK VALVE
SECONDARY RETURN
WRAS APPROVED
BRONZE PUMP