MEGAFLO Eco SolaReady, Product Manual

INST

ALLA

TION

11

Drain Tap
A drain tap is supplied fitted in the cold water supply to the Megaflo Eco SolaReady unit between the 8 Bar Pressure Relief 
Valve and the heater at the lowest point of the cold water supply pipe. 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). Ensure any drain-off points are positioned well away from any electrical components.

Outlet Pipework
Ideally the pipework from the Megaflo Eco SolaReady 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.

Thermostatic blending valve
The hot outlet pipework is connected to the "blended water" port of the thermostatic blending valve which is factory fitted. 
The valve is preset to a temperature of 55ºC, but can be set to a maximum of 65ºC ±2ºC.
NOTE: Storage temperature must be set at >55ºC for the blended temperature to be achieved.

DHW expansion vessel
The Expansion Vessel accommodates expansion that results from heating the water inside the unit.  The unit is pre-charged at 
0.35 MPa (3.5 bar).  The Expansion Vessel must be connected between the 8 Bar Pressure Relief Valve and the Megaflo Eco 
SolaReady cylinder (See Figure 5). An Expansion Vessel mounting bracket is supplied for this purpose.
NOTE: DO NOT USE THE POTABLE WATER EXPANSION VESSEL SUPPLIED WITH THE MEGAFLO ECO SOLAREADY FOR ANY 
OTHER PURPOSE.  IT MUST NOT BE USED IN PLACE OF THE SOLAR PRIMARY SYSTEM EXPANSION VESSEL. 

Secondary Circulation
If a secondary circulation system is required it is recommended that it be connected to the Megaflo Eco SolaReady as shown 
in Figure 7. To achieve this the 1/2” BSP Sensor Pocket must be removed. 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 additional expansion vessel to the secondary circuit. This should be done if the capacity of the secondary 
circuit exceeds 10 litres. To conserve energy it is recommended any secondary circulation pump is timed to operate only during 
periods of water draw-off demands.
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)
NOTE: Secondary circulation is NOT recommended for direct electric units connected to an off-peak electrical supply.

Megaflo Eco

SolaReady

Blending valve
Factory fitted

MCWS to Kitchen
(unbalanced cold
mains supply)

Incoming Cold
Water Main

Temperature/Pressure

Secondary return

Isolating valves

Check valve

Relief Valve

HWS supply

DOC

DOC

SC

SC

WRAS approved

bronze secondary

circulation pump

Figure 7 – Secondary Circulation Connection