MEGAFLO Eco SolaReady, Product Manual

COMMISSIONING

22

Commissioning

DO NOT SWITCH ON THE SOLAR DIFFERENTIAL CONTROLLER, AUXILIARY HEAT SOURCE OR IMMERSION HEATER(S) UNTIL 
THE UNIT IS FULL OF WATER.

Filling and flushing the Megaflo Eco SolaReady
Ensure that all fittings and immersion heaters are correctly fitted and tightened. An immersion heater key spanner is provided 
to aid in tightening the immersion heater(s).
Open a hot tap furthest from the Megaflo Eco SolaReady.
Open the isolating valve on the 3 Bar Pressure Reducing Valve by turning the blue handle on the stop cock (if fitted in this 
position) so that it lies parallel to the direction of flow. Open the mains stop cock to fill the unit. When water issues from the 
tap, allow to run for a few minutes to thoroughly flush through any residue, dirt or swarf, then close tap.
Open successive hot taps to purge any air from the system.
Check all connections for leaks and rectify as necessary.
 The Strainer housed within the 3 Bar Pressure Reducing Valve should be cleaned to remove any debris that may have been 
flushed through the main supply pipe. Refer to Maintenance, page 37 for instructions on how to do this.

Check the operation of the Safety Valves
Slowly, manually open (turn black knob on end counter-clockwise), for a few seconds, the Temperature and Pressure Relief 
Valve (T&P Valve) situated on the Megaflo Eco SolaReady unit (see Figure 1, page 5). Check water discharged runs freely away 
through the tundish and discharge pipework. Close valve, ensure water flow stops and valve reseats correctly.
 Repeat for the 8 Bar Pressure Relief Valve (see Figure 1, page 5).
NOTE: The water discharged may be very hot

Direct Units
Switch on the electrical supply to the immersion heater(s) and allow the unit to heat up. Check that the thermostat operates 
correctly. A storage temperature of approx. 60ºC is recommended. If necessary the temperature can be adjusted by inserting 
a flat bladed screwdriver in the adjustment knob on top of the immersion heater thermostat and rotating clockwise (see 
Figure 13, page 17). The full adjustment represents a temperature range of between 12º and 68ºC. Check that no water is 
discharged from either the Expansion Valve or Temperature and Pressure Relief Valve during the heating cycle.

Indirect Units
Fill the indirect (primary) circuit following the boiler manufacturer’s commissioning instructions. To ensure the primary heating 
coil in the Megaflo Eco SolaReady is filled the 2-port motorised valve (supplied) should be manually opened by moving the 
lever on the motor housing to the MAN OPEN position. When the primary circuit is full return the lever to the AUTO position. 
Vent any trapped air by opening the air bleed.
Switch on the boiler, ensure the programmer is set to Domestic Hot Water. Allow the Megaflo Eco SolaReady unit to heat up 
and check that the indirect thermostat and 2-port motorised valve operate correctly. A storage temperature of approx. 60ºC 
is recommended. If necessary the temperature can be adjusted by inserting a flat bladed screwdriver in the adjustment knob 
(located on the front of the thermostat mounting bracket see Figure 16, page 23) and rotating clockwise to increase the 
temperature or counter clockwise to reduce the temperature. The minimum thermostat setting is 12ºC. The adjustment range 
on the combined thermostat and thermal cut-out is 12°C-68°C
Check that no water is discharged from either the Expansion Valve or Temperature and Pressure Relief Valve during the 
heating cycle.